ROOT  6.07/01
Reference Guide
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Groups Pages
List of all members | Public Member Functions | Static Public Member Functions | Protected Attributes | List of all members
THistPainter Class Reference
Histograms and graphs painting classes.

The histogram painter class.

Implements all histograms' drawing's options.

Introduction

Histograms are drawn via the THistPainter class. Each histogram has a pointer to its own painter (to be usable in a multithreaded program). When the canvas has to be redrawn, the Paint function of each objects in the pad is called. In case of histograms, TH1::Paint invokes directly THistPainter::Paint.

To draw a histogram h is enough to do: 

h->Draw();

h can be of any kind: 1D, 2D or 3D. To choose how the histogram will be drawn, the Draw() method can be invoked with an option. For instance to draw a 2D histogram as a lego plot it is enough to do: 

h->Draw("lego");

THistPainter offers many options to paint 1D, 2D and 3D histograms.

When the Draw() method of a histogram is called for the first time (TH1::Draw), it creates a THistPainter object and saves a pointer to this "painter" as a data member of the histogram. The THistPainter class specializes in the drawing of histograms. It is separated from the histogram so that one can have histograms without the graphics overhead, for example in a batch program. Each histogram have its own painter rather than a central singleton painter painting all histograms, allows two histograms to be drawn in two threads without overwriting the painter's values.

When a displayed histogram is filled again, there is not need to call the Draw() method again; the image will be refreshed the next time the pad will be updated.

A pad is updated after one of these three actions:

  1. a carriage control on the ROOT command line,
  2. a click inside the pad,
  3. a call to TPad::Update.

By default a call to TH1::Draw() clears the pad of all objects before drawing the new image of the histogram. One can use the SAME option to leave the previous display intact and superimpose the new histogram. The same histogram can be drawn with different graphics options in different pads.

When a displayed histogram is deleted, its image is automatically removed from the pad.

To create a copy of the histogram when drawing it, one can use TH1::DrawClone(). This will clone the histogram and allow to change and delete the original one without affecting the clone.

Histograms' plotting options

Most options can be concatenated with or without spaces or commas, for example: 

h->Draw("E1 SAME");

The options are not case sensitive: 

h->Draw("e1 same");

The default drawing option can be set with TH1::SetOption and retrieve using TH1::GetOption: 

root [0] h->Draw();          // Draw "h" using the standard histogram representation.
root [1] h->Draw("E");       // Draw "h" using error bars
root [3] h->SetOption("E");  // Change the default drawing option for "h"
root [4] h->Draw();          // Draw "h" using error bars
root [5] h->GetOption();     // Retrieve the default drawing option for "h"
(const Option_t* 0xa3ff948)"E"

Options supported for 1D and 2D histograms

Option Description
"E" Draw error bars.
"AXIS" Draw only axis.
"AXIG" Draw only grid (if the grid is requested).
"HIST" When an histogram has errors it is visualized by default with error bars. To visualize it without errors use the option "HIST" together with the required option (eg "hist same c"). The "HIST" option can also be used to plot only the histogram and not the associated function(s).
"FUNC" When an histogram has a fitted function, this option allows to draw the fit result only.
"SAME" Superimpose on previous picture in the same pad.
"LEGO" Draw a lego plot with hidden line removal.
"LEGO1" Draw a lego plot with hidden surface removal.
"LEGO2" Draw a lego plot using colors to show the cell contents When the option "0" is used with any LEGO option, the empty bins are not drawn.
"LEGO3" Draw a lego plot with hidden surface removal, like LEGO1 but the border lines of each lego-bar are not drawn.
"LEGO4" Draw a lego plot with hidden surface removal, like LEGO1 but without the shadow effect on each lego-bar.
"TEXT" Draw bin contents as text (format set via gStyle->SetPaintTextFormat).
"TEXTnn" Draw bin contents as text at angle nn (0 < nn < 90).
"X+" The X-axis is drawn on the top side of the plot.
"Y+" The Y-axis is drawn on the right side of the plot.

Options supported for 1D histograms

Option Description
" " Default.
"AH" Draw histogram without axis. "A" can be combined with any drawing option. For instance, "AC" draws the histogram as a smooth Curve without axis.
"][" When this option is selected the first and last vertical lines of the histogram are not drawn.
"B" Bar chart option.
"BAR" Like option "B", but bars can be drawn with a 3D effect.
"HBAR" Like option "BAR", but bars are drawn horizontally.
"C" Draw a smooth Curve through the histogram bins.
"E0" Draw error bars. Markers are drawn for bins with 0 contents.
"E1" Draw error bars with perpendicular lines at the edges.
"E2" Draw error bars with rectangles.
"E3" Draw a fill area through the end points of the vertical error bars.
"E4" Draw a smoothed filled area through the end points of the error bars.
"E5" Like E3 but ignore the bins with 0 contents.
"E6" Like E4 but ignore the bins with 0 contents.
"X0" When used with one of the "E" option, it suppress the error bar along X as gStyle->SetErrorX(0) would do.
"L" Draw a line through the bin contents.
"P" Draw current marker at each bin except empty bins.
"P0" Draw current marker at each bin including empty bins.
"PIE" Draw histogram as a Pie Chart.
"*H" Draw histogram with a * at each bin.
"LF2" Draw histogram like with option "L" but with a fill area. Note that "L" draws also a fill area if the hist fill color is set but the fill area corresponds to the histogram contour.

Options supported for 2D histograms

Option Description
" " Default (scatter plot).
"ARR" Arrow mode. Shows gradient between adjacent cells.
"BOX" A box is drawn for each cell with surface proportional to the content's absolute value. A negative content is marked with a X.
"BOX1" A button is drawn for each cell with surface proportional to content's absolute value. A sunken button is drawn for negative values a raised one for positive.
"COL" A box is drawn for each cell with a color scale varying with contents. All the none empty bins are painted. Empty bins are not painted unless some bins have a negative content because in that case the null bins might be not empty. TProfile2D histograms are handled differently because, for this type of 2D histograms, it is possible to know if an empty bin has been filled or not. So even if all the bins' contents are positive some empty bins might be painted. And vice versa, if some bins have a negative content some empty bins might be not painted.
"COLZ" Same as "COL". In addition the color palette is also drawn.
"CANDLE" Draw a candle plot along X axis.
"CANDLEX" Same as "CANDLE".
"CANDLEY" Draw a candle plot along Y axis.
"VIOLIN" Draw a violin plot along X axis.
"VIOLINX" Same as "VIOLIN".
"VIOLINY" Draw a violin plot along Y axis.
"CONT" Draw a contour plot (same as CONT0).
"CONT0" Draw a contour plot using surface colors to distinguish contours.
"CONT1" Draw a contour plot using line styles to distinguish contours.
"CONT2" Draw a contour plot using the same line style for all contours.
"CONT3" Draw a contour plot using fill area colors.
"CONT4" Draw a contour plot using surface colors (SURF option at theta = 0).
"CONT5" (TGraph2D only) Draw a contour plot using Delaunay triangles.
"LIST" Generate a list of TGraph objects for each contour.
"CYL" Use Cylindrical coordinates. The X coordinate is mapped on the angle and the Y coordinate on the cylinder length.
"POL" Use Polar coordinates. The X coordinate is mapped on the angle and the Y coordinate on the radius.
"SPH" Use Spherical coordinates. The X coordinate is mapped on the latitude and the Y coordinate on the longitude.
"PSR" Use PseudoRapidity/Phi coordinates. The X coordinate is mapped on Phi.
"SURF" Draw a surface plot with hidden line removal.
"SURF1" Draw a surface plot with hidden surface removal.
"SURF2" Draw a surface plot using colors to show the cell contents.
"SURF3" Same as SURF with in addition a contour view drawn on the top.
"SURF4" Draw a surface using Gouraud shading.
"SURF5" Same as SURF3 but only the colored contour is drawn. Used with option CYL, SPH or PSR it allows to draw colored contours on a sphere, a cylinder or a in pseudo rapidity space. In cartesian or polar coordinates, option SURF3 is used.
"FB" With LEGO or SURFACE, suppress the Front-Box.
"BB" With LEGO or SURFACE, suppress the Back-Box.
"A" With LEGO or SURFACE, suppress the axis.
"SCAT" Draw a scatter-plot (default).
"[cutg]" Draw only the sub-range selected by the TCutG named "cutg".

Options supported for 3D histograms

Option Description
" " Default (scatter plot).
"ISO" Draw a Gouraud shaded 3d iso surface through a 3d histogram. It paints one surface at the value computed as follow: SumOfWeights/(NbinsX*NbinsY*NbinsZ).
"BOX" Draw a for each cell with volume proportional to the content's absolute value.
"LEGO" Same as BOX.

Options supported for histograms' stacks (THStack)

Option Description
" " Default, the histograms are drawn on top of each other (as lego plots for 2D histograms).
"NOSTACK" Histograms in the stack are all paint in the same pad as if the option SAME had been specified.
"NOSTACKB" Histograms are drawn next to each other as bar charts.
"PADS" The current pad/canvas is subdivided into a number of pads equal to the number of histograms in the stack and each histogram is paint into a separate pad.

Setting the Style

Histograms use the current style (gStyle). When one changes the current style and would like to propagate the changes to the histogram, TH1::UseCurrentStyle should be called. Call UseCurrentStyle on each histogram is needed.

To force all the histogram to use the current style use: 

gROOT->ForceStyle();

All the histograms read after this call will use the current style.

Setting line, fill, marker, and text attributes

The histogram classes inherit from the attribute classes: TAttLine, TAttFill and TAttMarker. See the description of these classes for the list of options.

Setting Tick marks on the histogram axis

The TPad::SetTicks method specifies the type of tick marks on the axis. If tx = gPad->GetTickx() and ty = gPad->GetTicky() then: 

tx = 1;   tick marks on top side are drawn (inside)
tx = 2;   tick marks and labels on top side are drawn
ty = 1;   tick marks on right side are drawn (inside)
ty = 2;   tick marks and labels on right side are drawn

By default only the left Y axis and X bottom axis are drawn (tx = ty = 0)

TPad::SetTicks(tx,ty) allows to set these options. See also The TAxis functions to set specific axis attributes.

In case multiple color filled histograms are drawn on the same pad, the fill area may hide the axis tick marks. One can force a redraw of the axis over all the histograms by calling: 

gPad->RedrawAxis();

Giving titles to the X, Y and Z axis

h->GetXaxis()->SetTitle("X axis title");
h->GetYaxis()->SetTitle("Y axis title");

The histogram title and the axis titles can be any TLatex string. The titles are part of the persistent histogram.

The option "SAME"

By default, when an histogram is drawn, the current pad is cleared before drawing. In order to keep the previous drawing and draw on top of it the option SAME should be use. The histogram drawn with the option SAME uses the coordinates system available in the current pad.

This option can be used alone or combined with any valid drawing option but some combinations must be use with care.

Limitations

Superimposing two histograms with different scales in the same pad

The following example creates two histograms, the second histogram is the bins integral of the first one. It shows a procedure to draw the two histograms in the same pad and it draws the scale of the second histogram using a new vertical axis on the right side. See also the tutorial transpad.C for a variant of this example.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
// create/fill draw h1
gStyle->SetOptStat(kFALSE);
TH1F *h1 = new TH1F("h1","Superimposing two histograms with different scales",100,-3,3);
Int_t i;
for (i=0;i<10000;i++) h1->Fill(gRandom->Gaus(0,1));
h1->Draw();
c1->Update();
// create hint1 filled with the bins integral of h1
TH1F *hint1 = new TH1F("hint1","h1 bins integral",100,-3,3);
Float_t sum = 0;
for (i=1;i<=100;i++) {
sum += h1->GetBinContent(i);
hint1->SetBinContent(i,sum);
}
// scale hint1 to the pad coordinates
Float_t rightmax = 1.1*hint1->GetMaximum();
Float_t scale = gPad->GetUymax()/rightmax;
hint1->SetLineColor(kRed);
hint1->Scale(scale);
hint1->Draw("same");
// draw an axis on the right side
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),
gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
axis->SetLineColor(kRed);
axis->SetTextColor(kRed);
axis->Draw();
return c1;
}
pict1_THistPainter_001.png

Statistics Display

The type of information shown in the histogram statistics box can be selected with: 

gStyle->SetOptStat(mode);

The mode has up to nine digits that can be set to on (1 or 2), off (0). 

mode = ksiourmen  (default = 000001111)
k = 1;  kurtosis printed
k = 2;  kurtosis and kurtosis error printed
s = 1;  skewness printed
s = 2;  skewness and skewness error printed
i = 1;  integral of bins printed
i = 2;  integral of bins with option "width" printed
o = 1;  number of overflows printed
u = 1;  number of underflows printed
r = 1;  standard deviation printed
r = 2;  standard deviation and standard deviation error printed
m = 1;  mean value printed
m = 2;  mean and mean error values printed
e = 1;  number of entries printed
n = 1;  name of histogram is printed

For example: 

gStyle->SetOptStat(11);

displays only the name of histogram and the number of entries, whereas: 

gStyle->SetOptStat(1101);

displays the name of histogram, mean value and standard deviation.

WARNING 1: never do: 

gStyle->SetOptStat(0001111);

but instead do: 

gStyle->SetOptStat(1111);

because 0001111 will be taken as an octal number!

WARNING 2: for backward compatibility with older versions 

gStyle->SetOptStat(1);

is taken as: 

gStyle->SetOptStat(1111)

To print only the name of the histogram do: 

gStyle->SetOptStat(1000000001);

NOTE that in case of 2D histograms, when selecting only underflow (10000) or overflow (100000), the statistics box will show all combinations of underflow/overflows and not just one single number.

The parameter mode can be any combination of the letters kKsSiIourRmMen 

k :  kurtosis printed
K :  kurtosis and kurtosis error printed
s :  skewness printed
S :  skewness and skewness error printed
i :  integral of bins printed
I :  integral of bins with option "width" printed
o :  number of overflows printed
u :  number of underflows printed
r :  standard deviation printed
R :  standard deviation and standard deviation error printed
m :  mean value printed
M :  mean value mean error values printed
e :  number of entries printed
n :  name of histogram is printed

For example, to print only name of histogram and number of entries do: 

gStyle->SetOptStat("ne");

To print only the name of the histogram do: 

gStyle->SetOptStat("n");

The default value is: 

gStyle->SetOptStat("nemr");

When a histogram is painted, a TPaveStats object is created and added to the list of functions of the histogram. If a TPaveStats object already exists in the histogram list of functions, the existing object is just updated with the current histogram parameters.

Once a histogram is painted, the statistics box can be accessed using h->FindObject("stats"). In the command line it is enough to do: 

Root > h->Draw()
Root > TPaveStats *st = (TPaveStats*)h->FindObject("stats")

because after h->Draw() the histogram is automatically painted. But in a script file the painting should be forced using gPad->Update() in order to make sure the statistics box is created: 

h->Draw();
gPad->Update();
TPaveStats *st = (TPaveStats*)h->FindObject("stats");

Without gPad->Update() the line h->FindObject("stats") returns a null pointer.

When a histogram is drawn with the option SAME, the statistics box is not drawn. To force the statistics box drawing with the option SAME, the option SAMES must be used. If the new statistics box hides the previous statistics box, one can change its position with these lines (h being the pointer to the histogram): 

Root > TPaveStats *st = (TPaveStats*)h->FindObject("stats")
Root > st->SetX1NDC(newx1); //new x start position
Root > st->SetX2NDC(newx2); //new x end position

To change the type of information for an histogram with an existing TPaveStats one should do: 

st->SetOptStat(mode);

Where mode has the same meaning than when calling gStyle->SetOptStat(mode) (see above).

One can delete the statistics box for a histogram TH1* h with: 

h->SetStats(0)

and activate it again with: 

h->SetStats(1).

Labels used in the statistics box ("Mean", "Std Dev", ...) can be changed from $ROOTSYS/etc/system.rootrc or .rootrc (look for the string Hist.Stats.).

Fit Statistics

The type of information about fit parameters printed in the histogram statistics box can be selected via the parameter mode. The parameter mode can be = pcev (default = 0111) 

p = 1;  print Probability
c = 1;  print Chisquare/Number of degrees of freedom
e = 1;  print errors (if e=1, v must be 1)
v = 1;  print name/values of parameters

Example: 

gStyle->SetOptFit(1011);

print fit probability, parameter names/values and errors.

  1. When v" = 1</tt> is specified, only the non-fixed parameters are shown. 2. When <tt>v" = 2 all parameters are shown.

Note: gStyle->SetOptFit(1) means "default value", so it is equivalent to gStyle->SetOptFit(111)

The error bars options

Option Description
"E" Default. Shows only the error bars, not a marker.
"E1" Small lines are drawn at the end of the error bars.
"E2" Error rectangles are drawn.
"E3" A filled area is drawn through the end points of the vertical error bars.
"E4" A smoothed filled area is drawn through the end points of the vertical error bars.
"E0" Draw also bins with null contents.
{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH1F *he = new TH1F("he","Distribution drawn with error bars (option E1) ",100,-3,3);
Int_t i;
for (i=0;i<10000;i++) he->Fill(gRandom->Gaus(0,1));
gStyle->SetEndErrorSize(3);
gStyle->SetErrorX(1.);
he->SetMarkerStyle(20);
he->Draw("E1");
return c1;
}
pict1_THistPainter_002.png

The options "E3" and "E4" draw an error band through the end points of the vertical error bars. With "E4" the error band is smoothed. Because of the smoothing algorithm used some artefacts may appear at the end of the band like in the following example. In such cases "E3" should be used instead of "E4".

{
TCanvas *ce4 = new TCanvas("ce4","ce4",600,400);
ce4->Divide(2,1);
TH1F *he4 = new TH1F("he4","Distribution drawn with option E4",100,-3,3);
Int_t i;
for (i=0;i<10000;i++) he4->Fill(gRandom->Gaus(0,1));
he4->SetFillColor(kRed);
he4->GetXaxis()->SetRange(40,48);
ce4->cd(1);
he4->Draw("E4");
ce4->cd(2);
TH1F *he3 = (TH1F*)he4->DrawClone("E3");
he3->SetTitle("Distribution drawn option E3");
return ce4;
}
pict1_THistPainter_003.png

2D histograms can be drawn with error bars as shown is the following example:

{
TCanvas *c2e = new TCanvas("c2e","c2e",600,400);
TH2F *h2e = new TH2F("h2e","TH2 drawn with option E",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
h2e->Fill(px,5*py);
}
h2e->Draw("E");
return c2e;
}
pict1_THistPainter_004.png

The bar chart option

The option "B" allows to draw simple vertical bar charts. The bar width is controlled with TH1::SetBarWidth(), and the bar offset wihtin the bin, with TH1::SetBarOffset(). These two settings are useful to draw several histograms on the same plot as shown in the following example:

{
int i;
const Int_t nx = 8;
string os_X[nx] = {"8","32","128","512","2048","8192","32768","131072"};
float d_35_0[nx] = {0.75, -3.30, -0.92, 0.10, 0.08, -1.69, -1.29, -2.37};
float d_35_1[nx] = {1.01, -3.02, -0.65, 0.37, 0.34, -1.42, -1.02, -2.10};
TCanvas *cb = new TCanvas("cb","cb",600,400);
cb->SetGrid();
gStyle->SetHistMinimumZero();
TH1F *h1b = new TH1F("h1b","Option B example",nx,0,nx);
h1b->SetFillColor(4);
h1b->SetBarWidth(0.4);
h1b->SetBarOffset(0.1);
h1b->SetStats(0);
h1b->SetMinimum(-5);
h1b->SetMaximum(5);
for (i=1; i<=nx; i++) {
h1b->SetBinContent(i, d_35_0[i-1]);
h1b->GetXaxis()->SetBinLabel(i,os_X[i-1].c_str());
}
h1b->Draw("b");
TH1F *h2b = new TH1F("h2b","h2b",nx,0,nx);
h2b->SetFillColor(38);
h2b->SetBarWidth(0.4);
h2b->SetBarOffset(0.5);
h2b->SetStats(0);
for (i=1;i<=nx;i++) h2b->SetBinContent(i, d_35_1[i-1]);
h2b->Draw("b same");
return cb;
}
pict1_THistPainter_005.png

The "BAR" and "HBAR" options

When the option "bar" or "hbar" is specified, a bar chart is drawn. A vertical bar-chart is drawn with the options bar, bar0, bar1, bar2, bar3, bar4. An horizontal bar-chart is drawn with the options hbar, hbar0, hbar1, hbar2,hbar3, hbar4` (hbars.C).

TCanvas *hbars() {
cout << gSystem->DirName(__FILE__) << endl;
// Try to open first the file cernstaff.root in tutorials/tree directory
TString filedir = gSystem->DirName(__FILE__);
filedir += TString("/../tree/");
TString filename = "cernstaff.root";
bool fileNotFound = gSystem->AccessPathName(filename); // note opposite return code
// If file is not found try to generate it uing the macro tree/cernbuild.C
if (fileNotFound) {
TString macroName = filedir + "cernbuild.C";
if (!gInterpreter->IsLoaded(macroName)) gInterpreter->LoadMacro(macroName);
gROOT->ProcessLineFast("cernbuild()");
}
TFile * f = TFile::Open(filename);
if (!f) {
Error("hbars","file cernstaff.root not found");
return 0;
}
TTree *T = (TTree*)f->Get("T");
if (!T) {
Error("hbars","Tree T is not present in file %s",f->GetName() );
return 0;
}
T->SetFillColor(45);
TCanvas *c1 = new TCanvas("c1","histograms with bars",700,800);
c1->SetFillColor(42);
c1->Divide(1,2);
// Horizontal bar chart
c1->cd(1); gPad->SetGrid(); gPad->SetLogx(); gPad->SetFrameFillColor(33);
T->Draw("Nation","","hbar2");
// Vertical bar chart
c1->cd(2); gPad->SetGrid(); gPad->SetFrameFillColor(33);
T->Draw("Division>>hDiv","","goff");
TH1F *hDiv = (TH1F*)gDirectory->Get("hDiv");
hDiv->SetStats(0);
TH1F *hDivFR = (TH1F*)hDiv->Clone("hDivFR");
T->Draw("Division>>hDivFR","Nation==\"FR\"","goff");
hDiv->SetBarWidth(0.45);
hDiv->SetBarOffset(0.1);
hDiv->SetFillColor(49);
TH1 *h1 = hDiv->DrawCopy("bar2");
hDivFR->SetBarWidth(0.4);
hDivFR->SetBarOffset(0.55);
hDivFR->SetFillColor(50);
TH1 *h2 = hDivFR->DrawCopy("bar2,same");
TLegend *legend = new TLegend(0.55,0.65,0.76,0.82);
legend->AddEntry(h1,"All nations","f");
legend->AddEntry(h2,"French only","f");
legend->Draw();
c1->cd();
delete f;
return c1;
}
pict1_THistPainter_006.png

To control the bar width (default is the bin width) TH1::SetBarWidth() should be used.

To control the bar offset (default is 0) TH1::SetBarOffset() should be used.

These two parameters are useful when several histograms are plotted using the option SAME. They allow to plot the histograms next to each other.

The SCATter plot option (default for 2D histograms)

For each cell (i,j) a number of points proportional to the cell content is drawn. A maximum of kNMAX points per cell is drawn. If the maximum is above kNMAX contents are normalized to kNMAX (kNMAX=2000). If option is of the form scat=ff, (eg scat=1.8, scat=1e-3), then ff is used as a scale factor to compute the number of dots. scat=1 is the default.

By default the scatter plot is painted with a "dot marker" which not scalable (see the TAttMarker documentation). To change the marker size, a scalable marker type should be used. For instance a circle (marker style 20).

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hscat = new TH2F("hscat","Option SCATter example (default for 2D histograms) ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hscat->Fill(px,5*py);
hscat->Fill(3+0.5*px,2*py-10.);
}
hscat->Draw("scat=0.5");
return c1;
}
pict1_THistPainter_007.png

The ARRow option

Shows gradient between adjacent cells. For each cell (i,j) an arrow is drawn The orientation of the arrow follows the cell gradient.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *harr = new TH2F("harr","Option ARRow example",20,-4,4,20,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
harr->Fill(px,5*py);
harr->Fill(3+0.5*px,2*py-10.,0.1);
}
harr->Draw("ARR");
return c1;
}
pict1_THistPainter_008.png

The BOX option

For each cell (i,j) a box is drawn. The size (surface) of the box is proportional to the absolute value of the cell content. The cells with a negative content draw with a X on top of the boxes.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
hbox = new TH2F("hbox","Option BOX example",3,0,3,3,0,3);
hbox->SetFillColor(42);
hbox->Fill(0.5, 0.5, 1.);
hbox->Fill(0.5, 1.5, 4.);
hbox->Fill(0.5, 2.5, 3.);
hbox->Fill(1.5, 0.5, 2.);
hbox->Fill(1.5, 1.5, 12.);
hbox->Fill(1.5, 2.5, -6.);
hbox->Fill(2.5, 0.5, -4.);
hbox->Fill(2.5, 1.5, 6.);
hbox->Fill(2.5, 2.5, 0.5);
hbox->Draw("BOX");
return c1;
}
pict1_THistPainter_009.png

With option BOX1 a button is drawn for each cell with surface proportional to content's absolute value. A sunken button is drawn for negative values a raised one for positive.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
hbox1 = new TH2F("hbox1","Option BOX1 example",3,0,3,3,0,3);
hbox1->SetFillColor(42);
hbox1->Fill(0.5, 0.5, 1.);
hbox1->Fill(0.5, 1.5, 4.);
hbox1->Fill(0.5, 2.5, 3.);
hbox1->Fill(1.5, 0.5, 2.);
hbox1->Fill(1.5, 1.5, 12.);
hbox1->Fill(1.5, 2.5, -6.);
hbox1->Fill(2.5, 0.5, -4.);
hbox1->Fill(2.5, 1.5, 6.);
hbox1->Fill(2.5, 2.5, 0.5);
hbox1->Draw("BOX1");
return c1;
}
pict1_THistPainter_010.png

When the option SAME (or "SAMES") is used with the option BOX, the boxes' sizes are computing taking the previous plots into account. The range along the Z axis is imposed by the first plot (the one without option SAME); therefore the order in which the plots are done is relevant.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hb1 = new TH2F("hb1","Example of BOX plots with option SAME ",40,-3,3,40,-3,3);
TH2F *hb2 = new TH2F("hb2","hb2",40,-3,3,40,-3,3);
TH2F *hb3 = new TH2F("hb3","hb3",40,-3,3,40,-3,3);
TH2F *hb4 = new TH2F("hb4","hb4",40,-3,3,40,-3,3);
for (Int_t i=0;i<1000;i++) {
double x,y;
gRandom->Rannor(x,y);
if (x>0 && y>0) hb1->Fill(x,y,4);
if (x<0 && y<0) hb2->Fill(x,y,3);
if (x>0 && y<0) hb3->Fill(x,y,2);
if (x<0 && y>0) hb4->Fill(x,y,1);
}
hb1->SetFillColor(1);
hb2->SetFillColor(2);
hb3->SetFillColor(3);
hb4->SetFillColor(4);
hb1->Draw("box");
hb2->Draw("box same");
hb3->Draw("box same");
hb4->Draw("box same");
return c1;
}
pict1_THistPainter_011.png

The COLor option

For each cell (i,j) a box is drawn with a color proportional to the cell content.

The color table used is defined in the current style.

If the histogram's minimum and maximum are the same (flat histogram), the mapping on colors is not possible, therefore nothing is painted. To paint a flat histogram it is enough to set the histogram minimum (TH1::SetMinimum()) different from the bins' content.

The default number of color levels used to paint the cells is 20. It can be changed with TH1::SetContour() or TStyle::SetNumberContours(). The higher this number is, the smoother is the color change between cells.

The color palette in TStyle can be modified via gStyle->SetPalette().

All the none empty bins are painted. Empty bins are not painted unless some bins have a negative content because in that case the null bins might be not empty.

TProfile2D histograms are handled differently because, for this type of 2D histograms, it is possible to know if an empty bin has been filled or not. So even if all the bins' contents are positive some empty bins might be painted. And vice versa, if some bins have a negative content some empty bins might be not painted.

Combined with the option COL, the option Z allows to display the color palette defined by gStyle->SetPalette().

In the following example, the histogram has only positive bins; the empty bins (containing 0) are not drawn.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcol1 = new TH2F("hcol1","Option COLor example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcol1->Fill(px,5*py);
}
gStyle->SetPalette(kBird);
hcol1->Draw("COLZ");
return c1;
}
pict1_THistPainter_012.png

In the first plot of following example, the histogram has some negative bins; the empty bins (containing 0) are drawn. In some cases one wants to not draw empty bins (containing 0) of histograms having a negative minimum. The option 1, used to produce the second plot in the following picture, allows to do that.

{
TCanvas *c1 = new TCanvas("c1","c1",600,600);
c1->Divide(1,2);
TH2F *hcol23 = new TH2F("hcol2","Option COLZ example ",40,-4,4,40,-20,20);
TH2F *hcol24 = new TH2F("hcol2","Option COLZ1 example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcol23->Fill(px,5*py);
hcol24->Fill(px,5*py);
}
hcol23->Fill(0.,0.,-200.);
hcol24->Fill(0.,0.,-200.);
gStyle->SetPalette(kBird);
c1->cd(1); hcol23->Draw("COLZ");
c1->cd(2); hcol24->Draw("COLZ1");
return c1;
}
pict1_THistPainter_013.png

When the maximum of the histogram is set to a smaller value than the real maximum, the bins having a content between the new maximum and the real maximum are painted with the color corresponding to the new maximum.

When the minimum of the histogram is set to a greater value than the real minimum, the bins having a value between the real minimum and the new minimum are not drawn unless the option 0 is set.

The following example illustrates the option 0 combined with the option COL.

{
TCanvas *c1 = new TCanvas("c1","c1",600,600);
c1->Divide(1,2);
TH2F *hcol21 = new TH2F("hcol21","Option COLZ",40,-4,4,40,-20,20);
TH2F *hcol22 = new TH2F("hcol22","Option COLZ0",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcol21->Fill(px,5*py);
hcol22->Fill(px,5*py);
}
hcol21->SetBit(TH1::kNoStats);
hcol22->SetBit(TH1::kNoStats);
gStyle->SetPalette(kBird);
c1->cd(1); hcol21->Draw("COLZ");
c1->cd(2); hcol22->Draw("COLZ0");
hcol22->SetMaximum(100);
hcol22->SetMinimum(40);
return c1;
}
pict1_THistPainter_014.png

The option COL can be combined with the option POL:

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcol1 = new TH2F("hcol1","Option COLor combined with POL",40,-4,4,40,-4,4);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcol1->Fill(px,py);
}
gStyle->SetPalette(kBird);
hcol1->Draw("COLZPOL");
return c1;
}
pict1_THistPainter_015.png

The CANDLE option

A Candle plot (also known as a "box-and whisker plot" or simply "box plot") is a convenient way to describe graphically a data distribution (D) with only five numbers. It was invented in 1977 by John Tukey.

With the option CANDLEX five numbers are:

  1. The minimum value of the distribution D (bottom dashed line).
  2. The lower quartile (Q1): 25% of the data points in D are less than Q1 (bottom of the box).
  3. The median (M): 50% of the data points in D are less than M (thick line segment inside the box).
  4. The upper quartile (Q3): 75% of the data points in D are less than Q3 (top of the box).
  5. The maximum value of the distribution D (top dashed line).

The mean value of the distribution D is also represented as a circle.

In this implementation a TH2 is considered as a collection of TH1 along X (option CANDLE or CANDLEX) or Y (option CANDLEY). Each TH1 is represented as a candle plot.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcandle = new TH2F("hcandle","Option CANDLE example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcandle->Fill(px,5*py);
}
hcandle->SetMarkerSize(0.5);
hcandle->Draw("CANDLE");
return c1;
}
pict1_THistPainter_016.png

The VIOLIN option

A violin plot is a box plot that also encodes the pdf information at each point.

Quartiles and mean are also represented at each point, with a marker and two lines.

In this implementation a TH2 is considered as a collection of TH1 along X (option VIOLIN or VIOLINX) or Y (option VIOLINY).

A solid fill style is recommended for this plot (as opposed to a hollow or hashed style).

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
Int_t nx(6), ny(40);
Double_t xmin(0.0), xmax(+6.0), ymin(0.0), ymax(+4.0);
TH2F* hviolin = new TH2F("hviolin", "Option VIOLIN example", nx, xmin, xmax, ny, ymin, ymax);
TF1 f1("f1", "gaus", +0,0 +4.0);
Double_t x,y;
for (Int_t iBin=1; iBin<hviolin->GetNbinsX(); ++iBin) {
Double_t xc = hviolin->GetXaxis()->GetBinCenter(iBin);
f1.SetParameters(1, 2.0+TMath::Sin(1.0+xc), 0.2+0.1*(xc-xmin)/xmax);
for(Int_t i=0; i<10000; ++i){
x = xc;
y = f1.GetRandom();
hviolin->Fill(x, y);
}
}
hviolin->SetFillColor(kGray);
hviolin->SetMarkerStyle(20);
hviolin->SetMarkerSize(0.5);
hviolin->Draw("VIOLIN");
c1->Update();
return c1;
}
pict1_THistPainter_017.png

The TEXT and TEXTnn Option

For each bin the content is printed. The text attributes are:

By default the format g is used. This format can be redefined by calling gStyle->SetPaintTextFormat().

It is also possible to use TEXTnn in order to draw the text with the angle nn (0 < nn < 90).

For 2D histograms the text is plotted in the center of each non empty cells. It is possible to plot empty cells by calling gStyle->SetHistMinimumZero(). For 1D histogram the text is plotted at a y position equal to the bin content.

For 2D histograms when the option "E" (errors) is combined with the option text ("TEXTE"), the error for each bin is also printed.

{
TCanvas *c01 = new TCanvas("c01","c01",700,400);
c01->Divide(2,1);
TH1F *htext1 = new TH1F("htext1","Option TEXT on 1D histograms ",10,-4,4);
TH2F *htext2 = new TH2F("htext2","Option TEXT on 2D histograms ",10,-4,4,10,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
htext1->Fill(px,0.1);
htext2->Fill(px,5*py,0.1);
}
gStyle->SetPaintTextFormat("4.1f m");
htext2->SetMarkerSize(1.8);
c01->cd(1);
htext2->Draw("TEXT45");
c01->cd(2);
htext1->Draw();
htext1->Draw("HIST TEXT0 SAME");
return c01;
}
pict1_THistPainter_018.png

In the case of profile histograms it is possible to print the number of entries instead of the bin content. It is enough to combine the option "E" (for entries) with the option "TEXT".

{
TCanvas *c02 = new TCanvas("c02","c02",700,400);
c02->Divide(2,1);
gStyle->SetPaintTextFormat("g");
TProfile *profile = new TProfile("profile","profile",10,0,10);
profile->SetMarkerSize(2.2);
profile->Fill(0.5,1);
profile->Fill(1.5,2);
profile->Fill(2.5,3);
profile->Fill(3.5,4);
profile->Fill(4.5,5);
profile->Fill(5.5,5);
profile->Fill(6.5,4);
profile->Fill(7.5,3);
profile->Fill(8.5,2);
profile->Fill(9.5,1);
c02->cd(1); profile->Draw("HIST TEXT0");
c02->cd(2); profile->Draw("HIST TEXT0E");
return c02;
}
pict1_THistPainter_019.png

The CONTour options

The following contour options are supported:

Option Description
"CONT" Draw a contour plot (same as CONT0).
"CONT0" Draw a contour plot using surface colors to distinguish contours.
"CONT1" Draw a contour plot using the line colors to distinguish contours.
"CONT2" Draw a contour plot using the line styles to distinguish contours.
"CONT3" Draw a contour plot solid lines for all contours.
"CONT4" Draw a contour plot using surface colors (SURF option at theta = 0).
"CONT5" Draw a contour plot using Delaunay triangles.

The following example shows a 2D histogram plotted with the option CONTZ. The option CONT draws a contour plot using surface colors to distinguish contours. Combined with the option CONT (or CONT0), the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcontz = new TH2F("hcontz","Option CONTZ example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcontz->Fill(px-1,5*py);
hcontz->Fill(2+0.5*px,2*py-10.,0.1);
}
gStyle->SetPalette(kBird);
hcontz->Draw("CONTZ");
return c1;
}
pict1_THistPainter_020.png

The following example shows a 2D histogram plotted with the option CONT1Z. The option CONT1 draws a contour plot using the line colors to distinguish contours. Combined with the option CONT1, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcont1 = new TH2F("hcont1","Option CONT1Z example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcont1->Fill(px-1,5*py);
hcont1->Fill(2+0.5*px,2*py-10.,0.1);
}
gStyle->SetPalette(kBird);
hcont1->Draw("CONT1Z");
return c1;
}
pict1_THistPainter_021.png

The following example shows a 2D histogram plotted with the option CONT2. The option CONT2 draws a contour plot using the line styles to distinguish contours.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcont2 = new TH2F("hcont2","Option CONT2 example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcont2->Fill(px-1,5*py);
hcont2->Fill(2+0.5*px,2*py-10.,0.1);
}
hcont2->Draw("CONT2");
return c1;
}
pict1_THistPainter_022.png

The following example shows a 2D histogram plotted with the option CONT3. The option CONT3 draws contour plot solid lines for all contours.

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcont3 = new TH2F("hcont3","Option CONT3 example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcont3->Fill(px-1,5*py);
hcont3->Fill(2+0.5*px,2*py-10.,0.1);
}
hcont3->Draw("CONT3");
return c1;
}
pict1_THistPainter_023.png

The following example shows a 2D histogram plotted with the option CONT4. The option CONT4 draws a contour plot using surface colors to distinguish contours (SURF option at theta = 0). Combined with the option CONT (or CONT0), the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c1 = new TCanvas("c1","c1",600,400);
TH2F *hcont4 = new TH2F("hcont4","Option CONT4Z example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hcont4->Fill(px-1,5*py);
hcont4->Fill(2+0.5*px,2*py-10.,0.1);
}
gStyle->SetPalette(kBird);
hcont4->Draw("CONT4Z");
return c1;
}
pict1_THistPainter_024.png

The default number of contour levels is 20 equidistant levels and can be changed with TH1::SetContour() or TStyle::SetNumberContours().

The LIST option

When option LIST is specified together with option CONT, the points used to draw the contours are saved in TGraph objects: 

h->Draw("CONT LIST");
gPad->Update();

The contour are saved in TGraph objects once the pad is painted. Therefore to use this functionnality in a macro, gPad->Update() should be performed after the histogram drawing. Once the list is built, the contours are accessible in the following way: 

TObjArray *contours = gROOT->GetListOfSpecials()->FindObject("contours")
Int_t ncontours     = contours->GetSize();
TList *list         = (TList*)contours->At(i);

Where i is a contour number, and list contains a list of TGraph objects. For one given contour, more than one disjoint polyline may be generated. The number of TGraphs per contour is given by: 

list->GetSize();

To access the first graph in the list one should do: 

TGraph *gr1 = (TGraph*)list->First();

The following example (ContourList.C) shows how to use this functionality.

Double_t SawTooth(Double_t x, Double_t WaveLen);
TCanvas *ContourList(){
const Double_t PI = TMath::Pi();
TCanvas* c = new TCanvas("c","Contour List",0,0,600,600);
c->SetRightMargin(0.15);
c->SetTopMargin(0.15);
Int_t i, j;
Int_t nZsamples = 80;
Int_t nPhiSamples = 80;
Double_t HofZwavelength = 4.0; // 4 meters
Double_t dZ = HofZwavelength/(Double_t)(nZsamples - 1);
Double_t dPhi = 2*PI/(Double_t)(nPhiSamples - 1);
TArrayD z(nZsamples);
TArrayD HofZ(nZsamples);
TArrayD phi(nPhiSamples);
TArrayD FofPhi(nPhiSamples);
// Discretized Z and Phi Values
for ( i = 0; i < nZsamples; i++) {
z[i] = (i)*dZ - HofZwavelength/2.0;
HofZ[i] = SawTooth(z[i], HofZwavelength);
}
for(Int_t i=0; i < nPhiSamples; i++){
phi[i] = (i)*dPhi;
FofPhi[i] = sin(phi[i]);
}
// Create Histogram
TH2D *HistStreamFn = new TH2D("HstreamFn",
"#splitline{Histogram with negative and positive contents. Six contours are defined.}{It is plotted with options CONT LIST to retrieve the contours points in TGraphs}",
nZsamples, z[0], z[nZsamples-1], nPhiSamples, phi[0], phi[nPhiSamples-1]);
// Load Histogram Data
for (Int_t i = 0; i < nZsamples; i++) {
for(Int_t j = 0; j < nPhiSamples; j++){
HistStreamFn->SetBinContent(i,j, HofZ[i]*FofPhi[j]);
}
}
gStyle->SetPalette(1);
gStyle->SetOptStat(0);
gStyle->SetTitleW(0.99);
gStyle->SetTitleH(0.08);
Double_t contours[6];
contours[0] = -0.7;
contours[1] = -0.5;
contours[2] = -0.1;
contours[3] = 0.1;
contours[4] = 0.4;
contours[5] = 0.8;
HistStreamFn->SetContour(6, contours);
// Draw contours as filled regions, and Save points
HistStreamFn->Draw("CONT Z LIST");
c->Update(); // Needed to force the plotting and retrieve the contours in TGraphs
// Get Contours
TObjArray *conts = (TObjArray*)gROOT->GetListOfSpecials()->FindObject("contours");
TList* contLevel = NULL;
TGraph* curv = NULL;
TGraph* gc = NULL;
Int_t nGraphs = 0;
Int_t TotalConts = 0;
if (conts == NULL){
printf("*** No Contours Were Extracted!\n");
TotalConts = 0;
return 0;
} else {
TotalConts = conts->GetSize();
}
printf("TotalConts = %d\n", TotalConts);
for(i = 0; i < TotalConts; i++){
contLevel = (TList*)conts->At(i);
printf("Contour %d has %d Graphs\n", i, contLevel->GetSize());
nGraphs += contLevel->GetSize();
}
nGraphs = 0;
TCanvas* c1 = new TCanvas("c1","Contour List",610,0,600,600);
c1->SetTopMargin(0.15);
TH2F *hr = new TH2F("hr",
"#splitline{Negative contours are returned first (highest to lowest). Positive contours are returned from}{lowest to highest. On this plot Negative contours are drawn in red and positive contours in blue.}",
2, -2, 2, 2, 0, 6.5);
hr->Draw();
Double_t x0, y0, z0;
TLatex l;
l.SetTextSize(0.03);
char val[20];
for(i = 0; i < TotalConts; i++){
contLevel = (TList*)conts->At(i);
if (i<3) z0 = contours[2-i];
else z0 = contours[i];
printf("Z-Level Passed in as: Z = %f\n", z0);
// Get first graph from list on curves on this level
curv = (TGraph*)contLevel->First();
for(j = 0; j < contLevel->GetSize(); j++){
curv->GetPoint(0, x0, y0);
if (z0<0) curv->SetLineColor(kRed);
if (z0>0) curv->SetLineColor(kBlue);
nGraphs ++;
printf("\tGraph: %d -- %d Elements\n", nGraphs,curv->GetN());
// Draw clones of the graphs to avoid deletions in case the 1st
// pad is redrawn.
gc = (TGraph*)curv->Clone();
gc->Draw("C");
sprintf(val,"%g",z0);
l.DrawLatex(x0,y0,val);
curv = (TGraph*)contLevel->After(curv); // Get Next graph
}
}
c1->Update();
printf("\n\n\tExtracted %d Contours and %d Graphs \n", TotalConts, nGraphs );
gStyle->SetTitleW(0.);
gStyle->SetTitleH(0.);
return c1;
}
Double_t SawTooth(Double_t x, Double_t WaveLen){
// This function is specific to a sawtooth function with period
// WaveLen, symmetric about x = 0, and with amplitude = 1. Each segment
// is 1/4 of the wavelength.
//
// |
// /\ |
// / \ |
// / \ |
// / \
// /--------\--------/------------
// |\ /
// | \ /
// | \ /
// | \/
//
Double_t y;
if ( (x < -WaveLen/2) || (x > WaveLen/2)) y = -99999999; // Error X out of bounds
if (x <= -WaveLen/4) {
y = x + 2.0;
} else if ((x > -WaveLen/4) && (x <= WaveLen/4)) {
y = -x ;
} else if (( x > WaveLen/4) && (x <= WaveLen/2)) {
y = x - 2.0;
}
return y;
}
pict1_THistPainter_025.png

The following options select the CONT4 option and are useful for sky maps or exposure maps (earth.C).

Option Description
"AITOFF" Draw a contour via an AITOFF projection.
"MERCATOR" Draw a contour via an Mercator projection.
"SINUSOIDAL" Draw a contour via an Sinusoidal projection.
"PARABOLIC" Draw a contour via an Parabolic projection.
TCanvas *earth(){
gStyle->SetPalette(1);
gStyle->SetOptTitle(1);
gStyle->SetOptStat(0);
TCanvas *c1 = new TCanvas("c1","earth_projections",700,700);
c1->Divide(2,2);
TH2F *ha = new TH2F("ha","Aitoff", 180, -180, 180, 179, -89.5, 89.5);
TH2F *hm = new TH2F("hm","Mercator", 180, -180, 180, 161, -80.5, 80.5);
TH2F *hs = new TH2F("hs","Sinusoidal",180, -180, 180, 181, -90.5, 90.5);
TH2F *hp = new TH2F("hp","Parabolic", 180, -180, 180, 181, -90.5, 90.5);
TString dat = gSystem->UnixPathName(__FILE__);
dat.ReplaceAll(".C",".dat");
dat.ReplaceAll("/./","/");
ifstream in;
in.open(dat.Data());
Float_t x,y;
while (1) {
in >> x >> y;
if (!in.good()) break;
ha->Fill(x,y, 1);
hm->Fill(x,y, 1);
hs->Fill(x,y, 1);
hp->Fill(x,y, 1);
}
in.close();
c1->cd(1); ha->Draw("aitoff");
c1->cd(2); hm->Draw("mercator");
c1->cd(3); hs->Draw("sinusoidal");
c1->cd(4); hp->Draw("parabolic");
return c1;
}
pict1_THistPainter_026.png

The LEGO options

In a lego plot the cell contents are drawn as 3-d boxes. The height of each box is proportional to the cell content. The lego aspect is control with the following options:

Option Description
"LEGO" Draw a lego plot using the hidden lines removal technique.
"LEGO1" Draw a lego plot using the hidden surface removal technique.
"LEGO2" Draw a lego plot using colors to show the cell contents.
"LEGO3" Draw a lego plot with hidden surface removal, like LEGO1 but the border lines of each lego-bar are not drawn.
"LEGO4" Draw a lego plot with hidden surface removal, like LEGO1 but without the shadow effect on each lego-bar.
"0" When used with any LEGO option, the empty bins are not drawn.

See the limitations with the option "SAME".

Line attributes can be used in lego plots to change the edges' style.

The following example shows a 2D histogram plotted with the option LEGO. The option LEGO draws a lego plot using the hidden lines removal technique.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hlego = new TH2F("hlego","Option LEGO example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hlego->Fill(px-1,5*py);
hlego->Fill(2+0.5*px,2*py-10.,0.1);
}
hlego->Draw("LEGO");
return c2;
}
pict1_THistPainter_027.png

The following example shows a 2D histogram plotted with the option LEGO1. The option LEGO1 draws a lego plot using the hidden surface removal technique. Combined with any LEGOn option, the option 0 allows to not drawn the empty bins.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hlego1 = new TH2F("hlego1","Option LEGO1 example (with option 0) ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hlego1->Fill(px-1,5*py);
hlego1->Fill(2+0.5*px,2*py-10.,0.1);
}
hlego1->SetFillColor(kYellow);
hlego1->Draw("LEGO1 0");
return c2;
}
pict1_THistPainter_028.png

The following example shows a 2D histogram plotted with the option LEGO3. Like the option LEGO1, the option LEGO3 draws a lego plot using the hidden surface removal technique but doesn't draw the border lines of each individual lego-bar. This is very useful for histograms having many bins. With such histograms the option LEGO1 gives a black image because of the border lines. This option also works with stacked legos.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hlego3 = new TH2F("hlego3","Option LEGO3 example",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hlego3->Fill(px-1,5*py);
hlego3->Fill(2+0.5*px,2*py-10.,0.1);
}
hlego3->SetFillColor(kRed);
hlego3->Draw("LEGO3");
return c2;
}

The following example shows a 2D histogram plotted with the option LEGO2. The option LEGO2 draws a lego plot using colors to show the cell contents. Combined with the option LEGO2, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hlego2 = new TH2F("hlego2","Option LEGO2Z example ",40,-4,4,40,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hlego2->Fill(px-1,5*py);
hlego2->Fill(2+0.5*px,2*py-10.,0.1);
}
gStyle->SetPalette(kBird);
hlego2->Draw("LEGO2Z");
return c2;
}
pict1_THistPainter_030.png

The "SURFace" options

In a surface plot, cell contents are represented as a mesh. The height of the mesh is proportional to the cell content.

Option Description
"SURF" Draw a surface plot using the hidden line removal technique.
"SURF1" Draw a surface plot using the hidden surface removal technique.
"SURF2" Draw a surface plot using colors to show the cell contents.
"SURF3" Same as SURF with an additionial filled contour plot on top.
"SURF4" Draw a surface using the Gouraud shading technique.
"SURF5" Used with one of the options CYL, PSR and CYL this option allows to draw a a filled contour plot.
"SURF6" This option should not be used directly. It is used internally when the CONT is used with option the option SAME on a 3D plot.
"SURF7" Same as SURF2 with an additionial line contour plot on top.

See the limitations with the option "SAME".

The following example shows a 2D histogram plotted with the option SURF. The option SURF draws a lego plot using the hidden lines removal technique.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hsurf = new TH2F("hsurf","Option SURF example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf->Fill(px-1,5*py);
hsurf->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf->Draw("SURF");
return c2;
}
pict1_THistPainter_031.png

The following example shows a 2D histogram plotted with the option SURF1. The option SURF1 draws a surface plot using the hidden surface removal technique. Combined with the option SURF1, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
gStyle->SetPalette(kBird);
TH2F *hsurf1 = new TH2F("hsurf1","Option SURF1 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf1->Fill(px-1,5*py);
hsurf1->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf1->Draw("SURF1");
return c2;
}
pict1_THistPainter_032.png

The following example shows a 2D histogram plotted with the option SURF2. The option SURF2 draws a surface plot using colors to show the cell contents. Combined with the option SURF2, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
gStyle->SetPalette(kBird);
TH2F *hsurf2 = new TH2F("hsurf2","Option SURF2 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf2->Fill(px-1,5*py);
hsurf2->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf2->Draw("SURF2");
return c2;
}
pict1_THistPainter_033.png

The following example shows a 2D histogram plotted with the option SURF3. The option SURF3 draws a surface plot using the hidden line removal technique with, in addition, a filled contour view drawn on the top. Combined with the option SURF3, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
gStyle->SetPalette(kBird);
TH2F *hsurf3 = new TH2F("hsurf3","Option SURF3 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf3->Fill(px-1,5*py);
hsurf3->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf3->Draw("SURF3");
return c2;
}
pict1_THistPainter_034.png

The following example shows a 2D histogram plotted with the option SURF4. The option SURF4 draws a surface using the Gouraud shading technique.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TH2F *hsurf4 = new TH2F("hsurf4","Option SURF4 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf4->Fill(px-1,5*py);
hsurf4->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf4->SetFillColor(kOrange);
hsurf4->Draw("SURF4");
return c2;
}
pict1_THistPainter_035.png

The following example shows a 2D histogram plotted with the option SURF5 CYL. Combined with the option SURF5, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
gStyle->SetPalette(kBird);
TH2F *hsurf5 = new TH2F("hsurf4","Option SURF5 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf5->Fill(px-1,5*py);
hsurf5->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf5->SetFillColor(kOrange);
hsurf5->Draw("SURF5 CYL");
return c2;
}
pict1_THistPainter_036.png

The following example shows a 2D histogram plotted with the option SURF7. The option SURF7 draws a surface plot using the hidden surfaces removal technique with, in addition, a line contour view drawn on the top. Combined with the option SURF7, the option Z allows to display the color palette defined by gStyle->SetPalette().

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
gStyle->SetPalette(kBird);
TH2F *hsurf7 = new TH2F("hsurf3","Option SURF7 example ",30,-4,4,30,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hsurf7->Fill(px-1,5*py);
hsurf7->Fill(2+0.5*px,2*py-10.,0.1);
}
hsurf7->Draw("SURF7");
return c2;
}
pict1_THistPainter_037.png

As shown in the following example, when a contour plot is painted on top of a surface plot using the option SAME, the contours appear in 3D on the surface.

{
TCanvas *c20=new TCanvas("c20","c20",600,400);
int NBins = 50;
double d = 2;
TH2F* hsc = new TH2F("hsc", "Surface and contour with option SAME ", NBins, -d, d, NBins, -d, d);
for (int bx = 1; bx <= NBins; ++bx) {
for (int by = 1; by <= NBins; ++by) {
double x = hsc->GetXaxis()->GetBinCenter(bx);
double y = hsc->GetYaxis()->GetBinCenter(by);
hsc->SetBinContent(bx, by, exp(-x*x)*exp(-y*y));
}
}
gStyle->SetPalette(kBird);
hsc->Draw("surf2");
hsc->Draw("CONT1 SAME");
return c20;
}
pict1_THistPainter_038.png

Cylindrical, Polar, Spherical and PseudoRapidity/Phi options

Legos and surfaces plots are represented by default in Cartesian coordinates. Combined with any LEGOn or SURFn options the following options allow to draw a lego or a surface in other coordinates systems.

Option Description
"CYL" Use Cylindrical coordinates. The X coordinate is mapped on the angle and the Y coordinate on the cylinder length.
"POL" Use Polar coordinates. The X coordinate is mapped on the angle and the Y coordinate on the radius.
"SPH" Use Spherical coordinates. The X coordinate is mapped on the latitude and the Y coordinate on the longitude.
"PSR" Use PseudoRapidity/Phi coordinates. The X coordinate is mapped on Phi.

WARNING: Axis are not drawn with these options.

The following example shows the same histogram as a lego plot is the four different coordinates systems.

{
TCanvas *c3 = new TCanvas("c3","c3",600,400);
c3->Divide(2,2);
TH2F *hlcc = new TH2F("hlcc","Cylindrical coordinates",20,-4,4,20,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hlcc->Fill(px-1,5*py);
hlcc->Fill(2+0.5*px,2*py-10.,0.1);
}
hlcc->SetFillColor(kYellow);
c3->cd(1); hlcc->Draw("LEGO1 CYL");
c3->cd(2); TH2F *hlpc = (TH2F*) hlcc->DrawClone("LEGO1 POL");
hlpc->SetTitle("Polar coordinates");
c3->cd(3); TH2F *hlsc = (TH2F*) hlcc->DrawClone("LEGO1 SPH");
hlsc->SetTitle("Spherical coordinates");
c3->cd(4); TH2F *hlprpc = (TH2F*) hlcc->DrawClone("LEGO1 PSR");
hlprpc->SetTitle("PseudoRapidity/Phi coordinates");
return c3;
}
pict1_THistPainter_039.png

The following example shows the same histogram as a surface plot is the four different coordinates systems.

{
TCanvas *c4 = new TCanvas("c4","c4",600,400);
c4->Divide(2,2);
TH2F *hscc = new TH2F("hscc","Cylindrical coordinates",20,-4,4,20,-20,20);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
gRandom->Rannor(px,py);
hscc->Fill(px-1,5*py);
hscc->Fill(2+0.5*px,2*py-10.,0.1);
}
gStyle->SetPalette(kBird);
c4->cd(1); hscc->Draw("SURF1 CYL");
c4->cd(2); TH2F *hspc = (TH2F*) hscc->DrawClone("SURF1 POL");
hspc->SetTitle("Polar coordinates");
c4->cd(3); TH2F *hssc = (TH2F*) hscc->DrawClone("SURF1 SPH");
hssc->SetTitle("Spherical coordinates");
c4->cd(4); TH2F *hsprpc = (TH2F*) hscc->DrawClone("SURF1 PSR");
hsprpc->SetTitle("PseudoRapidity/Phi coordinates");
return c4;
}
pict1_THistPainter_040.png

Base line for bar-charts and lego plots

By default the base line used to draw the boxes for bar-charts and lego plots is the histogram minimum. It is possible to force this base line to be 0 with the command: 

gStyle->SetHistMinimumZero();
{
TCanvas *c5 = new TCanvas("c5","c5",700,400);
c5->Divide(2,1);
gStyle->SetHistMinimumZero(1);
TH1F *hz1 = new TH1F("hz1","Bar-chart drawn from 0",20,-3,3);
TH2F *hz2 = new TH2F("hz2","Lego plot drawn from 0",20,-3,3,20,-3,3);
Int_t i;
Double_t x,y;
hz1->SetFillColor(kBlue);
hz2->SetFillColor(kBlue);
for (i=0;i<10000;i++) {
x = gRandom->Gaus(0,1);
y = gRandom->Gaus(0,1);
if (x>0) {
hz1->Fill(x,1);
hz2->Fill(x,y,1);
} else {
hz1->Fill(x,-1);
hz2->Fill(x,y,-2);
}
}
c5->cd(1); hz1->Draw("bar2");
c5->cd(2); hz2->Draw("lego1");
return c5;
}
pict1_THistPainter_041.png

This option also works for horizontal plots. The example given in the section "The bar chart option" appears as follow:

{
int i;
const Int_t nx = 8;
string os_X[nx] = {"8","32","128","512","2048","8192","32768","131072"};
float d_35_0[nx] = {0.75, -3.30, -0.92, 0.10, 0.08, -1.69, -1.29, -2.37};
float d_35_1[nx] = {1.01, -3.02, -0.65, 0.37, 0.34, -1.42, -1.02, -2.10};
TCanvas *cbh = new TCanvas("cbh","cbh",400,600);
cbh->SetGrid();
gStyle->SetHistMinimumZero();
TH1F *h1bh = new TH1F("h1bh","Option HBAR centered on 0",nx,0,nx);
h1bh->SetFillColor(4);
h1bh->SetBarWidth(0.4);
h1bh->SetBarOffset(0.1);
h1bh->SetStats(0);
h1bh->SetMinimum(-5);
h1bh->SetMaximum(5);
for (i=1; i<=nx; i++) {
h1bh->Fill(os_X[i-1].c_str(), d_35_0[i-1]);
h1bh->GetXaxis()->SetBinLabel(i,os_X[i-1].c_str());
}
h1bh->Draw("hbar");
TH1F *h2bh = new TH1F("h2bh","h2bh",nx,0,nx);
h2bh->SetFillColor(38);
h2bh->SetBarWidth(0.4);
h2bh->SetBarOffset(0.5);
h2bh->SetStats(0);
for (i=1;i<=nx;i++) h2bh->Fill(os_X[i-1].c_str(), d_35_1[i-1]);
h2bh->Draw("hbar same");
return cbh;
}
pict1_THistPainter_042.png

TH2Poly Drawing

The following options are supported:

Option Description
"SCAT" Draw a scatter plot (default).
"COL" Draw a color plot. All the none empty bins are painted. Empty bins are not painted.
"COLZ" Same as "COL". In addition the color palette is also drawn.
"TEXT" Draw bin contents as text (format set via gStyle->SetPaintTextFormat).
"TEXTN" Draw bin names as text.
"TEXTnn" Draw bin contents as text at angle nn (0 < nn < 90).
"L" Draw the bins boundaries as lines. The lines attibutes are the TGraphs ones.
"P" Draw the bins boundaries as markers. The markers attibutes are the TGraphs ones.
"F" Draw the bins boundaries as filled polygons. The filled polygons attibutes are the TGraphs ones.

TH2Poly can be drawn as a color plot (option COL). TH2Poly bins can have any shapes. The bins are defined as graphs. The following macro is a very simple example showing how to book a TH2Poly and draw it.

{
TCanvas *ch2p1 = new TCanvas("ch2p1","ch2p1",600,400);
TH2Poly *h2p = new TH2Poly();
h2p->SetName("h2poly_name");
h2p->SetTitle("h2poly_title");
Double_t px1[] = {0, 5, 6};
Double_t py1[] = {0, 0, 5};
Double_t px2[] = {0, -1, -1, 0};
Double_t py2[] = {0, 0, -1, 3};
Double_t px3[] = {4, 3, 0, 1, 2.4};
Double_t py3[] = {4, 3.7, 1, 3.7, 2.5};
h2p->AddBin(3, px1, py1);
h2p->AddBin(4, px2, py2);
h2p->AddBin(5, px3, py3);
h2p->Fill(0.1, 0.01, 3);
h2p->Fill(-0.5, -0.5, 7);
h2p->Fill(-0.7, -0.5, 1);
h2p->Fill(1, 3, 1.5);
Double_t fx[] = {0.1, -0.5, -0.7, 1};
Double_t fy[] = {0.01, -0.5, -0.5, 3};
Double_t fw[] = {3, 1, 1, 1.5};
h2p->FillN(4, fx, fy, fw);
gStyle->SetPalette(kBird);
h2p->Draw("col");
return ch2p1;
}
pict1_THistPainter_043.png

Rectangular bins are a frequent case. The special version of the AddBin method allows to define them more easily like shown in the following example (th2polyBoxes.C).

{
TCanvas *ch2p2 = new TCanvas("ch2p2","ch2p2",600,400);
gStyle->SetPalette(57);
TH2Poly *h2p = new TH2Poly();
h2p->SetName("Boxes");
h2p->SetTitle("Boxes");
Int_t i,j;
Int_t nx = 40;
Int_t ny = 40;
Double_t x1,y1,x2,y2;
Double_t dx=0.2, dy=0.1;
x1 = 0.;
x2 = dx;
for (i = 0; i<nx; i++) {
y1 = 0.;
y2 = dy;
for (j = 0; j<ny; j++) {
h2p->AddBin(x1, y1, x2, y2);
y1 = y2;
y2 = y2+y2*dy;
}
x1 = x2;
x2 = x2+x2*dx;
}
TRandom ran;
for (i = 0; i<300000; i++) {
h2p->Fill(50*ran.Gaus(2.,1), ran.Gaus(2.,1));
}
h2p->Draw("COLZ");
return ch2p2;
}
pict1_THistPainter_044.png

One TH2Poly bin can be a list of polygons. Such bins are defined by calling AddBin with a TMultiGraph. The following example shows a such case:

{
TCanvas *ch2p2 = new TCanvas("ch2p2","ch2p2",600,400);
Int_t i, bin;
const Int_t nx = 48;
const char *states [nx] = {
"alabama", "arizona", "arkansas", "california",
"colorado", "connecticut", "delaware", "florida",
"georgia", "idaho", "illinois", "indiana",
"iowa", "kansas", "kentucky", "louisiana",
"maine", "maryland", "massachusetts", "michigan",
"minnesota", "mississippi", "missouri", "montana",
"nebraska", "nevada", "new_hampshire", "new_jersey",
"new_mexico", "new_york", "north_carolina", "north_dakota",
"ohio", "oklahoma", "oregon", "pennsylvania",
"rhode_island", "south_carolina", "south_dakota", "tennessee",
"texas", "utah", "vermont", "virginia",
"washington", "west_virginia", "wisconsin", "wyoming"
};
Double_t pop[nx] = {
4708708, 6595778, 2889450, 36961664, 5024748, 3518288, 885122, 18537969,
9829211, 1545801, 12910409, 6423113, 3007856, 2818747, 4314113, 4492076,
1318301, 5699478, 6593587, 9969727, 5266214, 2951996, 5987580, 974989,
1796619, 2643085, 1324575, 8707739, 2009671, 19541453, 9380884, 646844,
11542645, 3687050, 3825657, 12604767, 1053209, 4561242, 812383, 6296254,
24782302, 2784572, 621760, 7882590, 6664195, 1819777, 5654774, 544270
};
Double_t lon1 = -130;
Double_t lon2 = -65;
Double_t lat1 = 24;
Double_t lat2 = 50;
TH2Poly *p = new TH2Poly("USA","USA Population",lon1,lon2,lat1,lat2);
TFile *f;
f = TFile::Open("http://root.cern.ch/files/usa.root");
TMultiGraph *mg;
TKey *key;
TIter nextkey(gDirectory->GetListOfKeys());
while ((key = (TKey*)nextkey())) {
TObject *obj = key->ReadObj();
if (obj->InheritsFrom("TMultiGraph")) {
mg = (TMultiGraph*)obj;
bin = p->AddBin(mg);
}
}
for (i=0; i<nx; i++) p->Fill(states[i], pop[i]);
gStyle->SetOptStat(11);
gStyle->SetPalette(kBird);
p->Draw("COLZ L");
return ch2p2;
}
pict1_THistPainter_045.png

TH2Poly histograms can also be plotted using the GL interface using the option "GLLEGO".

The SPEC option

This option allows to use the TSpectrum2Painter tools. See the full documentation in TSpectrum2Painter::PaintSpectrum.

Option "Z" : Adding the color palette on the right side of the pad

When this option is specified, a color palette with an axis indicating the value of the corresponding color is drawn on the right side of the picture. In case, not enough space is left, one can increase the size of the right margin by calling TPad::SetRightMargin(). The attributes used to display the palette axis values are taken from the Z axis of the object. For example, to set the labels size on the palette axis do: 

hist->GetZaxis()->SetLabelSize().

WARNING: The palette axis is always drawn vertically.

Setting the color palette

To change the color palette TStyle::SetPalette should be used, eg: 

gStyle->SetPalette(ncolors,colors);

For example the option COL draws a 2D histogram with cells represented by a box filled with a color index which is a function of the cell content. If the cell content is N, the color index used will be the color number in colors[N], etc. If the maximum cell content is greater than ncolors, all cell contents are scaled to ncolors.

If ncolors <= 0, a default palette (see below) of 50 colors is defined. This palette is recommended for pads, labels ...

if ncolors == 1 && colors == 0, then a Pretty Palette with a Spectrum Violet->Red is created with 50 colors. That's the default rain bow palette.

Other prefined palettes with 255 colors are available when colors == 0. The following value of ncolors give access to:

if ncolors = 51 and colors=0, a Deep Sea palette is used.
if ncolors = 52 and colors=0, a Grey Scale palette is used.
if ncolors = 53 and colors=0, a Dark Body Radiator palette is used.
if ncolors = 54 and colors=0, a two-color hue palette palette is used.(dark blue through neutral gray to bright yellow)
if ncolors = 55 and colors=0, a Rain Bow palette is used.
if ncolors = 56 and colors=0, an inverted Dark Body Radiator palette is used.

If ncolors > 0 && colors == 0, the default palette is used with a maximum of ncolors.

The default palette defines:

The color numbers specified in the palette can be viewed by selecting the item colors in the VIEW menu of the canvas tool bar. The red, green, and blue components of a color can be changed thanks to TColor::SetRGB().

Drawing a sub-range of a 2D histogram; the [cutg] option

Using a TCutG object, it is possible to draw a sub-range of a 2D histogram. One must create a graphical cut (mouse or C++) and specify the name of the cut between [] in the Draw() option. For example (fit2a.C), with a TCutG named cutg, one can call: 

myhist->Draw("surf1 [cutg]");

To invert the cut, it is enough to put a - in front of its name: 

myhist->Draw("surf1 [-cutg]");

It is possible to apply several cuts (, means logical AND): 

myhist->Draw("surf1 [cutg1,cutg2]");
#include "TF2.h"
#include "TH2.h"
#include "TCutG.h"
#include "TMath.h"
#include "TCanvas.h"
#include "TStyle.h"
//+ Fitting a 2-D histogram (a variant)
// This tutorial illustrates :
// - how to create a 2-d function
// - fill a 2-d histogram randomly from this function
// - fit the histogram
// - display the fitted function on top of the histogram (lego-plot)
// using a surface plot in a sub-range of the histogram.
//
// This example can be executed via the interpreter or/and the compiler
// root > .x fit2a.C
// root > .x fit2a.C++
//Author: Rene Brun
Double_t g2(Double_t *x, Double_t *par) {
Double_t r1 = Double_t((x[0]-par[1])/par[2]);
Double_t r2 = Double_t((x[1]-par[3])/par[4]);
return par[0]*TMath::Exp(-0.5*(r1*r1+r2*r2));
}
Double_t fun2(Double_t *x, Double_t *par) {
Double_t *p1 = &par[0];
Double_t *p2 = &par[5];
Double_t *p3 = &par[10];
Double_t result = g2(x,p1) + g2(x,p2) + g2(x,p3);
return result;
}
TCanvas *fit2a() {
TCanvas *c = new TCanvas();
gStyle->SetOptStat(kTRUE);
gStyle->SetPalette(57);
const Int_t npar = 15;
Double_t f2params[npar] = {100,-3,3,-3,3,160,0,0.8,0,0.9,40,4,0.7,4,0.7};
TF2 *f2 = new TF2("f2",fun2,-10,10,-10,10, npar);
f2->SetParameters(f2params);
//Create an histogram and fill it randomly with f2
TH2F *h2 = new TH2F("h2","From f2",40,-10,10,40,-10,10);
Int_t nentries = 100000;
h2->FillRandom("f2",nentries);
//Fit h2 with original function f2
Float_t ratio = 4*nentries/100000;
f2params[ 0] *= ratio;
f2params[ 5] *= ratio;
f2params[10] *= ratio;
f2->SetParameters(f2params);
h2->Fit("f2","N");
TCutG *cutg = new TCutG("cutg",5);
cutg->SetPoint(0,-7,-7);
cutg->SetPoint(1, 2,-7);
cutg->SetPoint(2, 2, 2);
cutg->SetPoint(3,-7, 2);
cutg->SetPoint(4,-7,-7);
h2->Draw("lego2 0");
h2->SetFillColor(38);
f2->SetNpx(80);
f2->SetNpy(80);
f2->Draw("surf1 same bb [cutg]");
return c;
}
pict1_THistPainter_046.png

Drawing options for 3D histograms

Option Description
"ISO" Draw a Gouraud shaded 3d iso surface through a 3d histogram. It paints one surface at the value computed as follow: SumOfWeights/(NbinsX*NbinsY*NbinsZ)
"BOX" Draw a for each cell with volume proportional to the content's absolute value.

By default, like 2D histograms, 3D histograms are drawn as scatter plots.

The following example shows a 3D histogram plotted as a scatter plot.

{
TCanvas *c06 = new TCanvas("c06","c06",600,400);
gStyle->SetOptStat(kFALSE);
TH3F *h3scat = new TH3F("h3scat","Option SCAT (default) ",15,-2,2,15,-2,2,15,0,4);
Double_t x, y, z;
for (Int_t i=0;i<10000;i++) {
gRandom->Rannor(x, y);
z = x*x + y*y;
h3scat->Fill(x,y,z);
}
h3scat->Draw();
return c06;
}
pict1_THistPainter_047.png

The following example shows a 3D histogram plotted with the option BOX.

{
TCanvas *c16 = new TCanvas("c16","c16",600,400);
gStyle->SetOptStat(kFALSE);
TH3F *h3box = new TH3F("h3box","Option BOX",15,-2,2,15,-2,2,15,0,4);
Double_t x, y, z;
for (Int_t i=0;i<10000;i++) {
gRandom->Rannor(x, y);
z = x*x + y*y;
h3box->Fill(x,y,z);
}
h3box->Draw("BOX");
return c16;
}
pict1_THistPainter_048.png

The following example shows a 3D histogram plotted with the option ISO.

{
TCanvas *c26 = new TCanvas("c26","c26",600,400);
gStyle->SetOptStat(kFALSE);
TH3F *h3iso = new TH3F("h3iso","Option ISO",15,-2,2,15,-2,2,15,0,4);
Double_t x, y, z;
for (Int_t i=0;i<10000;i++) {
gRandom->Rannor(x, y);
z = x*x + y*y;
h3iso->Fill(x,y,z);
}
h3iso->SetFillColor(kCyan);
h3iso->Draw("ISO");
return c26;
}
pict1_THistPainter_049.png

Drawing option for histograms' stacks

Stacks of histograms are managed with the THStack. A THStack is a collection of TH1 (or derived) objects. For painting only the THStack containing TH1 only or THStack containing TH2 only will be considered.

By default, histograms are shown stacked:

  1. The first histogram is paint.
  2. The the sum of the first and second, etc...

If the option NOSTACK is specified, the histograms are all paint in the same pad as if the option SAME had been specified. This allows to compute X and Y scales common to all the histograms, like TMultiGraph does for graphs.

If the option PADS is specified, the current pad/canvas is subdivided into a number of pads equal to the number of histograms and each histogram is paint into a separate pad.

The following example shows various types of stacks (hstack.C).

TCanvas *hstack() {
THStack *hs = new THStack("hs","Stacked 1D histograms");
//create three 1-d histograms
TH1F *h1st = new TH1F("h1st","test hstack",100,-4,4);
h1st->FillRandom("gaus",20000);
h1st->SetFillColor(kRed);
h1st->SetMarkerStyle(21);
h1st->SetMarkerColor(kRed);
hs->Add(h1st);
TH1F *h2st = new TH1F("h2st","test hstack",100,-4,4);
h2st->FillRandom("gaus",15000);
h2st->SetFillColor(kBlue);
h2st->SetMarkerStyle(21);
h2st->SetMarkerColor(kBlue);
hs->Add(h2st);
TH1F *h3st = new TH1F("h3st","test hstack",100,-4,4);
h3st->FillRandom("gaus",10000);
h3st->SetFillColor(kGreen);
h3st->SetMarkerStyle(21);
h3st->SetMarkerColor(kGreen);
hs->Add(h3st);
TCanvas *cst = new TCanvas("cst","stacked hists",10,10,700,700);
cst->SetFillColor(41);
cst->Divide(2,2);
// in top left pad, draw the stack with defaults
cst->cd(1);
hs->Draw();
// in top right pad, draw the stack in non-stack mode
// and errors option
cst->cd(2);
gPad->SetGrid();
hs->Draw("nostack,e1p");
//in bottom left, draw in stack mode with "lego1" option
cst->cd(3);
gPad->SetFrameFillColor(17);
gPad->SetTheta(3.77);
gPad->SetPhi(2.9);
hs->Draw("lego1");
cst->cd(4);
//create two 2-D histograms and draw them in stack mode
gPad->SetFrameFillColor(17);
THStack *a = new THStack("a","Stacked 2D histograms");
TF2 *f1 = new TF2("f1",
"xygaus + xygaus(5) + xylandau(10)",-4,4,-4,4);
Double_t params1[] = {130,-1.4,1.8,1.5,1, 150,2,0.5,-2,0.5,
3600,-2,0.7,-3,0.3};
f1->SetParameters(params1);
TH2F *h2sta = new TH2F("h2sta","h2sta",20,-4,4,20,-4,4);
h2sta->SetFillColor(38);
h2sta->FillRandom("f1",4000);
TF2 *f2 = new TF2("f2","xygaus + xygaus(5)",-4,4,-4,4);
Double_t params2[] = {100,-1.4,1.9,1.1,2, 80,2,0.7,-2,0.5};
f2->SetParameters(params2);
TH2F *h2stb = new TH2F("h2stb","h2stb",20,-4,4,20,-4,4);
h2stb->SetFillColor(46);
h2stb->FillRandom("f2",3000);
a->Add(h2sta);
a->Add(h2stb);
a->Draw();
return cst;
}
pict1_THistPainter_050.png

The option nostackb allows to draw the histograms next to each other as bar charts:

{
TCanvas *cst0 = new TCanvas("cst0","cst0",600,400);
THStack *hs = new THStack("hs","Stacked 1D histograms: option #font[82]{\"nostackb\"}");
TH1F *h1 = new TH1F("h1","h1",10,-4,4);
h1->FillRandom("gaus",20000);
h1->SetFillColor(kRed);
hs->Add(h1);
TH1F *h2 = new TH1F("h2","h2",10,-4,4);
h2->FillRandom("gaus",15000);
h2->SetFillColor(kBlue);
hs->Add(h2);
TH1F *h3 = new TH1F("h3","h3",10,-4,4);
h3->FillRandom("gaus",10000);
h3->SetFillColor(kGreen);
hs->Add(h3);
hs->Draw("nostackb");
hs->GetXaxis()->SetNdivisions(-10);
cst0->SetGridx();
return cst0;
}
pict1_THistPainter_051.png

If at least one of the histograms in the stack has errors, the whole stack is visualized by default with error bars. To visualize it without errors the option HIST should be used.

{
TCanvas *cst1 = new TCanvas("cst1","cst1",700,400);
cst1->Divide(2,1);
TH1F * hst11 = new TH1F("hst11", "", 20, -10, 10);
hst11->Sumw2();
hst11->FillRandom("gaus", 1000);
hst11->SetFillColor(kViolet);
hst11->SetLineColor(kViolet);
TH1F * hst12 = new TH1F("hst12", "", 20, -10, 10);
hst12->FillRandom("gaus", 500);
hst12->SetFillColor(kBlue);
hst12->SetLineColor(kBlue);
THStack st1("st1", "st1");
st1.Add(hst11);
st1.Add(hst12);
cst1->cd(1); st1.Draw();
cst1->cd(2); st1.Draw("hist");
return cst1;
}
pict1_THistPainter_052.png

Drawing of 3D implicit functions

3D implicit functions (TF3) can be drawn as iso-surfaces. The implicit function f(x,y,z) = 0 is drawn in cartesian coordinates. In the following example the options "FB" and "BB" suppress the "Front Box" and "Back Box" around the plot.

{
TCanvas *c2 = new TCanvas("c2","c2",600,400);
TF3 *f3 = new TF3("f3","sin(x*x+y*y+z*z-36)",-2,2,-2,2,-2,2);
f3->SetClippingBoxOn(0,0,0);
f3->SetFillColor(30);
f3->SetLineColor(15);
f3->Draw("FBBB");
return c2;
}
pict1_THistPainter_053.png

Associated functions drawing

An associated function is created by TH1::Fit. More than on fitted function can be associated with one histogram (see TH1::Fit).

A TF1 object f1 can be added to the list of associated functions of an histogram h without calling TH1::Fit simply doing: 

h->GetListOfFunctions()->Add(f1);

or 

h->GetListOfFunctions()->Add(f1,someoption);

To retrieve a function by name from this list, do: 

TF1 *f1 = (TF1*)h->GetListOfFunctions()->FindObject(name);

or 

TF1 *f1 = h->GetFunction(name);

Associated functions are automatically painted when an histogram is drawn. To avoid the painting of the associated functions the option HIST should be added to the list of the options used to paint the histogram.

Drawing using OpenGL

The class TGLHistPainter allows to paint data set using the OpenGL 3D graphics library. The plotting options start with GL keyword. In addition, in order to inform canvases that OpenGL should be used to render 3D representations, the following option should be set: 

gStyle->SetCanvasPreferGL(true);

General information: plot types and supported options

The following types of plots are provided:

For lego plots the supported options are:

Option Description
"GLLEGO" Draw a lego plot. It works also for TH2Poly.
"GLLEGO2"Bins with color levels.
"GLLEGO3"Cylindrical bars.

Lego painter in cartesian supports logarithmic scales for X, Y, Z. In polar only Z axis can be logarithmic, in cylindrical only Y.

For surface plots (TF2 and TH2) the supported options are:

Option Description
"GLSURF" Draw a surface.
"GLSURF1" Surface with color levels
"GLSURF2" The same as "GLSURF1" but without polygon outlines.
"GLSURF3" Color level projection on top of plot (works only in cartesian coordinate system).
"GLSURF4" Same as "GLSURF" but without polygon outlines.

The surface painting in cartesian coordinates supports logarithmic scales along X, Y, Z axis. In polar coordinates only the Z axis can be logarithmic, in cylindrical coordinates only the Y axis.

Additional options to SURF and LEGO - Coordinate systems:

Option Description
" " Default, cartesian coordinates system.
"POL" Polar coordinates system.
"CYL" Cylindrical coordinates system.
"SPH" Spherical coordinates system.

TH3 as color boxes

The supported option is:

Option Description
"GLCOL" H3 is drawn using semi-transparent colored boxes. See $ROOTSYS/tutorials/gl/glvox1.C.

TH3 as boxes (spheres)

The supported options are:

Option Description
"GLBOX" TH3 as a set of boxes, size of box is proportional to bin content.
"GLBOX1" The same as "glbox", but spheres are drawn instead of boxes.

TH3 as iso-surface(s)

The supported option is:

Option Description
"GLISO" TH3 is drawn using iso-surfaces.

TF3 (implicit function)

The supported option is:

Option Description
"GLTF3" Draw a TF3.

Parametric surfaces

$ROOTSYS/tutorials/gl/glparametric.C shows how to create parametric equations and visualize the surface.

Interaction with the plots

All the interactions are implemented via standard methods DistancetoPrimitive() and ExecuteEvent(). That's why all the interactions with the OpenGL plots are possible only when the mouse cursor is in the plot's area (the plot's area is the part of a the pad occupied by gl-produced picture). If the mouse cursor is not above gl-picture, the standard pad interaction is performed.

Selectable parts

Different parts of the plot can be selected:

Rotation and zooming

Panning

The selected plot can be moved in a pad's area by pressing and holding the left mouse button and the shift key.

Box cut

Surface, iso, box, TF3 and parametric painters support box cut by pressing the 'c' or 'C' key when the mouse cursor is in a plot's area. That will display a transparent box, cutting away part of the surface (or boxes) in order to show internal part of plot. This box can be moved inside the plot's area (the full size of the box is equal to the plot's surrounding box) by selecting one of the box cut axes and pressing the left mouse button to move it.

Plot specific interactions (dynamic slicing etc.)

Currently, all gl-plots support some form of slicing. When back plane is selected (and if it's highlighted in green) you can press and hold left mouse button and shift key and move this back plane inside plot's area, creating the slice. During this "slicing" plot becomes semi-transparent. To remove all slices (and projected curves for surfaces) double click with left mouse button in a plot's area.

Surface with option "GLSURF"

The surface profile is displayed on the slicing plane. The profile projection is drawn on the back plane by pressing 'p' or 'P' key.

TF3

The contour plot is drawn on the slicing plane. For TF3 the color scheme can be changed by pressing 's' or 'S'.

Box

The contour plot corresponding to slice plane position is drawn in real time.

Iso

Slicing is similar to "GLBOX" option.

Parametric plot

No slicing. Additional keys: 's' or 'S' to change color scheme - about 20 color schemes supported ('s' for "scheme"); 'l' or 'L' to increase number of polygons ('l' for "level" of details), 'w' or 'W' to show outlines ('w' for "wireframe").

Definition at line 41 of file THistPainter.h.

Public Member Functions

 THistPainter ()
 
virtual ~THistPainter ()
 Default destructor. More...
 
virtual void DefineColorLevels (Int_t ndivz)
 Define the color levels used to paint legos, surfaces etc.. More...
 
virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
 Compute the distance from the point px,py to a line. More...
 
virtual void DrawPanel ()
 Display a panel with all histogram drawing options. More...
 
virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
 Execute the actions corresponding to event. More...
 
virtual TList * GetContourList (Double_t contour) const
 Get a contour (as a list of TGraphs) using the Delaunay triangulation. More...
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Display the histogram info (bin number, contents, integral up to bin corresponding to cursor position px,py. More...
 
virtual TList * GetStack () const
 
virtual Bool_t IsInside (Int_t x, Int_t y)
 Return kTRUE if the cell ix, iy is inside one of the graphical cuts. More...
 
virtual Bool_t IsInside (Double_t x, Double_t y)
 Return kTRUE if the point x, y is inside one of the graphical cuts. More...
 
virtual Int_t MakeChopt (Option_t *option)
 Decode string choptin and fill Hoption structure. More...
 
virtual Int_t MakeCuts (char *cutsopt)
 Decode string choptin and fill Graphical cuts structure. More...
 
virtual void Paint (Option_t *option="")
 Control routine to paint any kind of histograms More...
 
virtual void PaintArrows (Option_t *option)
 Control function to draw a table as an arrow plot More...
 
virtual void PaintAxis (Bool_t drawGridOnly=kFALSE)
 Draw axis (2D case) of an histogram. More...
 
virtual void PaintBar (Option_t *option)
 Draw a bar-chart in a normal pad. More...
 
virtual void PaintBarH (Option_t *option)
 Draw a bar char in a rotated pad (X vertical, Y horizontal) More...
 
virtual void PaintBoxes (Option_t *option)
 Control function to draw a 2D histogram as a box plot More...
 
virtual void PaintCandlePlot (Option_t *option)
 Control function to draw a 2D histogram as a candle (box) plot. More...
 
virtual void PaintViolinPlot (Option_t *option)
 Control function to draw a 2D histogram as a violin plot More...
 
virtual void PaintColorLevels (Option_t *option)
 Control function to draw a 2D histogram as a color plot. More...
 
virtual void PaintTH2PolyBins (Option_t *option)
 Control function to draw a TH2Poly bins' contours. More...
 
virtual void PaintTH2PolyColorLevels (Option_t *option)
 Control function to draw a TH2Poly as a color plot. More...
 
virtual void PaintTH2PolyScatterPlot (Option_t *option)
 Control function to draw a TH2Poly as a scatter plot. More...
 
virtual void PaintTH2PolyText (Option_t *option)
 Control function to draw a TH2Poly as a text plot. More...
 
virtual void PaintContour (Option_t *option)
 Control function to draw a 2D histogram as a contour plot. More...
 
virtual Int_t PaintContourLine (Double_t elev1, Int_t icont1, Double_t x1, Double_t y1, Double_t elev2, Int_t icont2, Double_t x2, Double_t y2, Double_t *xarr, Double_t *yarr, Int_t *itarr, Double_t *levels)
 Fill the matrix xarr and yarr for Contour Plot. More...
 
virtual void PaintErrors (Option_t *option)
 Draw 1D histograms error bars. More...
 
virtual void Paint2DErrors (Option_t *option)
 Draw 2D histograms errors. More...
 
virtual void PaintFrame ()
 Calculate range and clear pad (canvas). More...
 
virtual void PaintFunction (Option_t *option)
 Paint functions associated to an histogram. More...
 
virtual void PaintHist (Option_t *option)
 Control routine to draw 1D histograms More...
 
virtual void PaintH3 (Option_t *option="")
 Control function to draw a 3D histograms. More...
 
virtual void PaintH3Iso ()
 Control function to draw a 3D histogram with Iso Surfaces. More...
 
virtual Int_t PaintInit ()
 Compute histogram parameters used by the drawing routines. More...
 
virtual Int_t PaintInitH ()
 Compute histogram parameters used by the drawing routines for a rotated pad. More...
 
virtual void PaintLego (Option_t *option)
 Control function to draw a 2D histogram as a lego plot. More...
 
virtual void PaintLegoAxis (TGaxis *axis, Double_t ang)
 Draw the axis for legos and surface plots. More...
 
virtual void PaintPalette ()
 Paint the color palette on the right side of the pad. More...
 
virtual void PaintScatterPlot (Option_t *option)
 Control function to draw a 2D histogram as a scatter plot. More...
 
virtual void PaintStat (Int_t dostat, TF1 *fit)
 Draw the statistics box for 1D and profile histograms. More...
 
virtual void PaintStat2 (Int_t dostat, TF1 *fit)
 Draw the statistics box for 2D histograms. More...
 
virtual void PaintStat3 (Int_t dostat, TF1 *fit)
 Draw the statistics box for 3D histograms. More...
 
virtual void PaintSurface (Option_t *option)
 Control function to draw a 2D histogram as a surface plot. More...
 
virtual void PaintTriangles (Option_t *option)
 Control function to draw a table using Delaunay triangles. More...
 
virtual void PaintTable (Option_t *option)
 Control function to draw 2D/3D histograms (tables). More...
 
virtual void PaintText (Option_t *option)
 Control function to draw a 1D/2D histograms with the bin values. More...
 
virtual void PaintTitle ()
 Draw the histogram title. More...
 
virtual void PaintTF3 ()
 Control function to draw a 3D implicit functions. More...
 
virtual void ProcessMessage (const char *mess, const TObject *obj)
 Process message mess. More...
 
virtual void RecalculateRange ()
 Recompute the histogram range following graphics operations. More...
 
virtual void RecursiveRemove (TObject *)
 Recursively remove this object from a list. More...
 
virtual void SetHistogram (TH1 *h)
 Set current histogram to h More...
 
virtual void SetStack (TList *stack)
 
virtual void SetShowProjection (const char *option, Int_t nbins)
 Set projection. More...
 
virtual void ShowProjectionX (Int_t px, Int_t py)
 Show projection onto X. More...
 
virtual void ShowProjectionY (Int_t px, Int_t py)
 Show projection onto Y. More...
 
virtual void ShowProjection3 (Int_t px, Int_t py)
 Show projection (specified by fShowProjection) of a TH3. More...
 
virtual Int_t TableInit ()
 Initialize various options to draw 2D histograms. More...
 
- Public Member Functions inherited from TVirtualHistPainter
 TVirtualHistPainter ()
 
virtual ~TVirtualHistPainter ()
 
- Public Member Functions inherited from TObject
 TObject ()
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
TObject & operator= (const TObject &rhs)
 TObject assignment operator. More...
 
virtual ~TObject ()
 TObject destructor. More...
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad. More...
 
virtual void Browse (TBrowser *b)
 Browse object. May be overridden for another default action. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Clear (Option_t *="")
 
virtual TObject * Clone (const char *newname="") const
 Make a clone of an object using the Streamer facility. More...
 
virtual Int_t Compare (const TObject *obj) const
 Compare abstract method. More...
 
virtual void Copy (TObject &object) const
 Copy this to obj. More...
 
virtual void Delete (Option_t *option="")
 Delete this object. More...
 
virtual void Draw (Option_t *option="")
 Default Draw method for all objects. More...
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs. More...
 
virtual TObject * DrawClone (Option_t *option="") const
 Draw a clone of this object in the current pad. More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Execute (const char *method, const char *params, Int_t *error=0)
 Execute method on this object with the given parameter string, e.g. More...
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=0)
 Execute method on this object with parameters stored in the TObjArray. More...
 
virtual TObject * FindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObject * FindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_t * GetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. More...
 
virtual const char * GetName () const
 Returns name of object. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual Option_t * GetOption () const
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out. More...
 
virtual ULong_t Hash () const
 Return hash value for this object. More...
 
virtual Bool_t InheritsFrom (const char *classname) const
 Returns kTRUE if object inherits from class "classname". More...
 
virtual Bool_t InheritsFrom (const TClass *cl) const
 Returns kTRUE if object inherits from TClass cl. More...
 
virtual void Inspect () const
 Dump contents of this object in a graphics canvas. More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory). More...
 
virtual Bool_t IsSortable () const
 
Bool_t IsOnHeap () const
 
Bool_t IsZombie () const
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
virtual void ls (Option_t *option="") const
 The ls function lists the contents of a class on stdout. More...
 
virtual void Pop ()
 Pop on object drawn in a pad to the top of the display list. More...
 
virtual void Print (Option_t *option="") const
 This method must be overridden when a class wants to print itself. More...
 
virtual Int_t Read (const char *name)
 Read contents of object with specified name from the current directory. More...
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename. More...
 
virtual void SavePrimitive (std::ostream &out, Option_t *option="")
 Save a primitive as a C++ statement(s) on output stream "out". More...
 
virtual void SetDrawOption (Option_t *option="")
 Set drawing option for object. More...
 
virtual void SetUniqueID (UInt_t uid)
 Set the unique object id. More...
 
virtual void UseCurrentStyle ()
 Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
 Write this object to the current directory. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 Write this object to the current directory. More...
 
void * operator new (size_t sz)
 
void * operator new[] (size_t sz)
 
void * operator new (size_t sz, void *vp)
 
void * operator new[] (size_t sz, void *vp)
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. More...
 
void SetBit (UInt_t f)
 
void ResetBit (UInt_t f)
 
Bool_t TestBit (UInt_t f) const
 
Int_t TestBits (UInt_t f) const
 
void InvertBit (UInt_t f)
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. More...
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. More...
 
virtual void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
virtual void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
void AbstractMethod (const char *method) const
 Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...
 
void MayNotUse (const char *method) const
 Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 

Static Public Member Functions

static Int_t ProjectAitoff2xy (Double_t l, Double_t b, Double_t &Al, Double_t &Ab)
 Static function. More...
 
static Int_t ProjectMercator2xy (Double_t l, Double_t b, Double_t &Al, Double_t &Ab)
 Static function. More...
 
static Int_t ProjectSinusoidal2xy (Double_t l, Double_t b, Double_t &Al, Double_t &Ab)
 Static function code from Ernst-Jan Buis. More...
 
static Int_t ProjectParabolic2xy (Double_t l, Double_t b, Double_t &Al, Double_t &Ab)
 Static function code from Ernst-Jan Buis. More...
 
static const char * GetBestFormat (Double_t v, Double_t e, const char *f)
 This function returns the best format to print the error value (e) knowing the parameter value (v) and the format (f) used to print it. More...
 
static void PaintSpecialObjects (const TObject *obj, Option_t *option)
 Static function to paint special objects like vectors and matrices. More...
 
- Static Public Member Functions inherited from TVirtualHistPainter
static TVirtualHistPainter * HistPainter (TH1 *obj)
 
static void SetPainter (const char *painter)
 Static function to set an alternative histogram painter. More...
 
- Static Public Member Functions inherited from TObject
static Long_t GetDtorOnly ()
 Return destructor only flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only flag. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable. More...
 

Protected Attributes

TH1 * fH
 
TAxis * fXaxis
 
TAxis * fYaxis
 
TAxis * fZaxis
 
TList * fFunctions
 
TPainter3dAlgorithms * fLego
 
TGraph2DPainter * fGraph2DPainter
 
TPie * fPie
 
Double_t * fXbuf
 
Double_t * fYbuf
 
Int_t fNcuts
 
Int_t fCutsOpt [kMaxCuts]
 
TCutG * fCuts [kMaxCuts]
 
TList * fStack
 
Int_t fShowProjection
 
TString fShowOption
 

Additional Inherited Members

- Public Types inherited from TObject
enum  EStatusBits {
  kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4),
  kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}
 
enum  { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }
 
enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }
 
- Protected Member Functions inherited from TObject
void MakeZombie ()
 
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected). More...
 

#include <THistPainter.h>

Inheritance diagram for THistPainter:
[legend]

Constructor & Destructor Documentation

THistPainter::THistPainter ( )
THistPainter::~THistPainter ( )
virtual

Default destructor.

Definition at line 2514 of file THistPainter.cxx.

Member Function Documentation

void THistPainter::DefineColorLevels ( Int_t  ndivz)
virtual

Define the color levels used to paint legos, surfaces etc..

Definition at line 8097 of file THistPainter.cxx.

Referenced by PaintLego(), and PaintSurface().

Int_t THistPainter::DistancetoPrimitive ( Int_t  px,
Int_t  py 
)
virtual

Compute the distance from the point px,py to a line.

Compute the closest distance of approach from point px,py to elements of an histogram. The distance is computed in pixels units.

Algorithm: Currently, this simple model computes the distance from the mouse to the histogram contour only.

Implements TVirtualHistPainter.

Definition at line 2528 of file THistPainter.cxx.

void THistPainter::DrawPanel ( )
virtual

Display a panel with all histogram drawing options.

Implements TVirtualHistPainter.

Definition at line 2706 of file THistPainter.cxx.

void THistPainter::ExecuteEvent ( Int_t  event,
Int_t  px,
Int_t  py 
)
virtual

Execute the actions corresponding to event.

This function is called when a histogram is clicked with the locator at the pixel position px,py.

Implements TVirtualHistPainter.

Definition at line 2727 of file THistPainter.cxx.

const char * THistPainter::GetBestFormat ( Double_t  v,
Double_t  e,
const char *  f 
)
static

This function returns the best format to print the error value (e) knowing the parameter value (v) and the format (f) used to print it.

Definition at line 9195 of file THistPainter.cxx.

Referenced by PaintStat().

TList * THistPainter::GetContourList ( Double_t  contour) const
virtual

Get a contour (as a list of TGraphs) using the Delaunay triangulation.

Implements TVirtualHistPainter.

Definition at line 2954 of file THistPainter.cxx.

char * THistPainter::GetObjectInfo ( Int_t  px,
Int_t  py 
) const
virtual

Display the histogram info (bin number, contents, integral up to bin corresponding to cursor position px,py.

Implements TVirtualHistPainter.

Definition at line 2983 of file THistPainter.cxx.

virtual TList* THistPainter::GetStack ( ) const
inlinevirtual

Implements TVirtualHistPainter.

Definition at line 70 of file THistPainter.h.

Bool_t THistPainter::IsInside ( Int_t  x,
Int_t  y 
)
virtual

Return kTRUE if the cell ix, iy is inside one of the graphical cuts.

Implements TVirtualHistPainter.

Definition at line 3111 of file THistPainter.cxx.

Referenced by IsInside(), TPainter3dAlgorithms::LegoCartesian(), Paint2DErrors(), PaintArrows(), PaintBoxes(), PaintColorLevels(), PaintContour(), PaintScatterPlot(), PaintText(), and TPainter3dAlgorithms::SurfaceCartesian().

Bool_t THistPainter::IsInside ( Double_t  x,
Double_t  y 
)
virtual

Return kTRUE if the point x, y is inside one of the graphical cuts.

Implements TVirtualHistPainter.

Definition at line 3130 of file THistPainter.cxx.

Int_t THistPainter::MakeChopt ( Option_t *  option)
virtual

Decode string choptin and fill Hoption structure.

Definition at line 3147 of file THistPainter.cxx.

Referenced by Paint().

Int_t THistPainter::MakeCuts ( char *  cutsopt)
virtual

Decode string choptin and fill Graphical cuts structure.

Implements TVirtualHistPainter.

Definition at line 3504 of file THistPainter.cxx.

Referenced by MakeChopt().

void THistPainter::Paint ( Option_t *  option = "")
virtual

Control routine to paint any kind of histograms

Implements TVirtualHistPainter.

Definition at line 3552 of file THistPainter.cxx.

void THistPainter::Paint2DErrors ( Option_t *  option)
virtual

Draw 2D histograms errors.

Definition at line 5503 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintArrows ( Option_t *  option)
virtual

Control function to draw a table as an arrow plot

Definition at line 3741 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintAxis ( Bool_t  drawGridOnly = kFALSE)
virtual

Draw axis (2D case) of an histogram.

If drawGridOnly is TRUE, only the grid is painted (if needed). This allows to draw the grid and the axis separately. In THistPainter::Paint this feature is used to make sure that the grid is drawn in the background and the axis tick marks in the foreground of the pad.

Definition at line 3836 of file THistPainter.cxx.

Referenced by Paint(), PaintBarH(), PaintContour(), and PaintTable().

void THistPainter::PaintBar ( Option_t *  option)
virtual

Draw a bar-chart in a normal pad.

Definition at line 4114 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintBarH ( Option_t *  option)
virtual

Draw a bar char in a rotated pad (X vertical, Y horizontal)

Definition at line 4161 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintBoxes ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a box plot

Definition at line 4235 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintCandlePlot ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a candle (box) plot.

Definition at line 4413 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintColorLevels ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a color plot.

Definition at line 4684 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintContour ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a contour plot.

Definition at line 4824 of file THistPainter.cxx.

Referenced by PaintTable().

Int_t THistPainter::PaintContourLine ( Double_t  elev1,
Int_t  icont1,
Double_t  x1,
Double_t  y1,
Double_t  elev2,
Int_t  icont2,
Double_t  x2,
Double_t  y2,
Double_t *  xarr,
Double_t *  yarr,
Int_t *  itarr,
Double_t *  levels 
)
virtual

Fill the matrix xarr and yarr for Contour Plot.

Definition at line 5168 of file THistPainter.cxx.

Referenced by PaintContour().

void THistPainter::PaintErrors ( Option_t *  option)
virtual

Draw 1D histograms error bars.

Definition at line 5226 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintFrame ( )
virtual

Calculate range and clear pad (canvas).

Definition at line 5665 of file THistPainter.cxx.

Referenced by Paint(), PaintBarH(), and PaintTable().

void THistPainter::PaintFunction ( Option_t *  option)
virtual

Paint functions associated to an histogram.

Definition at line 5689 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintH3 ( Option_t *  option = "")
virtual

Control function to draw a 3D histograms.

Definition at line 5873 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintH3Iso ( )
virtual

Control function to draw a 3D histogram with Iso Surfaces.

Definition at line 6356 of file THistPainter.cxx.

Referenced by PaintH3().

void THistPainter::PaintHist ( Option_t *  option)
virtual

Control routine to draw 1D histograms

Definition at line 5730 of file THistPainter.cxx.

Referenced by Paint().

Int_t THistPainter::PaintInit ( )
virtual

Compute histogram parameters used by the drawing routines.

Definition at line 5953 of file THistPainter.cxx.

Referenced by ExecuteEvent(), and Paint().

Int_t THistPainter::PaintInitH ( )
virtual

Compute histogram parameters used by the drawing routines for a rotated pad.

Definition at line 6190 of file THistPainter.cxx.

Referenced by PaintBarH().

void THistPainter::PaintLego ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a lego plot.

Definition at line 6475 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintLegoAxis ( TGaxis *  axis,
Double_t  ang 
)
virtual

Draw the axis for legos and surface plots.

Definition at line 6685 of file THistPainter.cxx.

Referenced by Paint2DErrors(), PaintH3(), PaintH3Iso(), PaintLego(), PaintSurface(), PaintTF3(), and PaintTriangles().

void THistPainter::PaintPalette ( )
virtual

Paint the color palette on the right side of the pad.

Definition at line 6868 of file THistPainter.cxx.

Referenced by PaintArrows(), PaintBoxes(), PaintColorLevels(), PaintContour(), PaintH3(), PaintLego(), PaintScatterPlot(), PaintSurface(), PaintTable(), PaintTH2PolyColorLevels(), and PaintTriangles().

void THistPainter::PaintScatterPlot ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a scatter plot.

Definition at line 6906 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintSpecialObjects ( const TObject *  obj,
Option_t *  option 
)
static

Static function to paint special objects like vectors and matrices.

This function is called via gROOT->ProcessLine to paint these objects without having a direct dependency of the graphics or histogramming system.

Definition at line 7023 of file THistPainter.cxx.

void THistPainter::PaintStat ( Int_t  dostat,
TF1 *  fit 
)
virtual

Draw the statistics box for 1D and profile histograms.

Implements TVirtualHistPainter.

Definition at line 7062 of file THistPainter.cxx.

Referenced by Paint(), and PaintBarH().

void THistPainter::PaintStat2 ( Int_t  dostat,
TF1 *  fit 
)
virtual

Draw the statistics box for 2D histograms.

Definition at line 7286 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintStat3 ( Int_t  dostat,
TF1 *  fit 
)
virtual

Draw the statistics box for 3D histograms.

Definition at line 7506 of file THistPainter.cxx.

Referenced by PaintH3().

void THistPainter::PaintSurface ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a surface plot.

Definition at line 7746 of file THistPainter.cxx.

Referenced by PaintContour(), and PaintTable().

void THistPainter::PaintTable ( Option_t *  option)
virtual

Control function to draw 2D/3D histograms (tables).

Definition at line 8126 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::PaintText ( Option_t *  option)
virtual

Control function to draw a 1D/2D histograms with the bin values.

Definition at line 8541 of file THistPainter.cxx.

Referenced by Paint(), and PaintTable().

void THistPainter::PaintTF3 ( )
virtual

Control function to draw a 3D implicit functions.

Definition at line 8638 of file THistPainter.cxx.

Referenced by PaintH3().

void THistPainter::PaintTH2PolyBins ( Option_t *  option)
virtual

Control function to draw a TH2Poly bins' contours.

  • option = "F" draw the bins as filled areas.
  • option = "L" draw the bins as line.
  • option = "P" draw the bins as markers.

Definition at line 8212 of file THistPainter.cxx.

Referenced by PaintTable(), PaintTH2PolyScatterPlot(), and PaintTH2PolyText().

void THistPainter::PaintTH2PolyColorLevels ( Option_t *  option)
virtual

Control function to draw a TH2Poly as a color plot.

Definition at line 8270 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintTH2PolyScatterPlot ( Option_t *  option)
virtual

Control function to draw a TH2Poly as a scatter plot.

Definition at line 8367 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintTH2PolyText ( Option_t *  option)
virtual

Control function to draw a TH2Poly as a text plot.

Definition at line 8481 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintTitle ( )
virtual

Draw the histogram title.

The title is drawn according to the title alignment returned by GetTitleAlign(). It is a 2 digits integer): hv

where h is the horizontal alignment and v is the vertical alignment.

  • h can get the values 1 2 3 for left, center, and right
  • v can get the values 1 2 3 for bottom, middle and top

for instance the default alignment is: 13 (left top)

Definition at line 8709 of file THistPainter.cxx.

Referenced by Paint(), PaintBarH(), PaintH3(), PaintH3Iso(), PaintTable(), and PaintTF3().

void THistPainter::PaintTriangles ( Option_t *  option)
virtual

Control function to draw a table using Delaunay triangles.

Definition at line 7996 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::PaintViolinPlot ( Option_t *  option)
virtual

Control function to draw a 2D histogram as a violin plot

Definition at line 4572 of file THistPainter.cxx.

Referenced by PaintTable().

void THistPainter::ProcessMessage ( const char *  mess,
const TObject *  obj 
)
virtual

Process message mess.

Implements TVirtualHistPainter.

Definition at line 8786 of file THistPainter.cxx.

Int_t THistPainter::ProjectAitoff2xy ( Double_t  l,
Double_t  b,
Double_t &  Al,
Double_t &  Ab 
)
static

Static function.

Convert Right Ascension, Declination to X,Y using an AITOFF projection. This procedure can be used to create an all-sky map in Galactic coordinates with an equal-area Aitoff projection. Output map coordinates are zero longitude centered. Also called Hammer-Aitoff projection (first presented by Ernst von Hammer in 1892)

source: GMT

code from Ernst-Jan Buis

Definition at line 8816 of file THistPainter.cxx.

Referenced by RecalculateRange(), and TPainter3dAlgorithms::SurfaceCartesian().

Int_t THistPainter::ProjectMercator2xy ( Double_t  l,
Double_t  b,
Double_t &  Al,
Double_t &  Ab 
)
static

Static function.

Probably the most famous of the various map projections, the Mercator projection takes its name from Mercator who presented it in 1569. It is a cylindrical, conformal projection with no distortion along the equator. The Mercator projection has been used extensively for world maps in which the distortion towards the polar regions grows rather large, thus incorrectly giving the impression that, for example, Greenland is larger than South America. In reality, the latter is about eight times the size of Greenland. Also, the Former Soviet Union looks much bigger than Africa or South America. One may wonder whether this illusion has had any influence on U.S. foreign policy.' (Source: GMT) code from Ernst-Jan Buis

Definition at line 8852 of file THistPainter.cxx.

Referenced by RecalculateRange(), and TPainter3dAlgorithms::SurfaceCartesian().

Int_t THistPainter::ProjectParabolic2xy ( Double_t  l,
Double_t  b,
Double_t &  Al,
Double_t &  Ab 
)
static

Static function code from Ernst-Jan Buis.

Definition at line 8877 of file THistPainter.cxx.

Referenced by RecalculateRange(), and TPainter3dAlgorithms::SurfaceCartesian().

Int_t THistPainter::ProjectSinusoidal2xy ( Double_t  l,
Double_t  b,
Double_t &  Al,
Double_t &  Ab 
)
static

Static function code from Ernst-Jan Buis.

Definition at line 8865 of file THistPainter.cxx.

Referenced by RecalculateRange(), and TPainter3dAlgorithms::SurfaceCartesian().

void THistPainter::RecalculateRange ( )
virtual

Recompute the histogram range following graphics operations.

Definition at line 8889 of file THistPainter.cxx.

Referenced by ExecuteEvent(), and PaintFrame().

virtual void THistPainter::RecursiveRemove ( TObject *  obj)
inlinevirtual

Recursively remove this object from a list.

Typically implemented by classes that can contain multiple references to a same object.

Reimplemented from TObject.

Definition at line 120 of file THistPainter.h.

void THistPainter::SetHistogram ( TH1 *  h)
virtual

Set current histogram to h

Implements TVirtualHistPainter.

Definition at line 9001 of file THistPainter.cxx.

Referenced by Paint().

void THistPainter::SetShowProjection ( const char *  option,
Int_t  nbins 
)
virtual

Set projection.

Implements TVirtualHistPainter.

Definition at line 9249 of file THistPainter.cxx.

virtual void THistPainter::SetStack ( TList *  stack)
inlinevirtual

Implements TVirtualHistPainter.

Definition at line 122 of file THistPainter.h.

void THistPainter::ShowProjection3 ( Int_t  px,
Int_t  py 
)
virtual

Show projection (specified by fShowProjection) of a TH3.

The drawing option for the projection is in fShowOption.

First implementation; R.Brun

Full implementation: Tim Tran (timtr.nosp@m.an@j.nosp@m.lab.o.nosp@m.rg) April 2006

Definition at line 9448 of file THistPainter.cxx.

Referenced by ExecuteEvent().

void THistPainter::ShowProjectionX ( Int_t  px,
Int_t  py 
)
virtual

Show projection onto X.

Definition at line 9277 of file THistPainter.cxx.

Referenced by ShowProjection3().

void THistPainter::ShowProjectionY ( Int_t  px,
Int_t  py 
)
virtual

Show projection onto Y.

Definition at line 9360 of file THistPainter.cxx.

Referenced by ShowProjection3().

Int_t THistPainter::TableInit ( )
virtual

Initialize various options to draw 2D histograms.

Definition at line 9016 of file THistPainter.cxx.

Referenced by Paint(), and PaintTable().

Member Data Documentation

TCutG* THistPainter::fCuts[kMaxCuts]
protected

Definition at line 56 of file THistPainter.h.

Referenced by IsInside(), and MakeCuts().

Int_t THistPainter::fCutsOpt[kMaxCuts]
protected

Definition at line 55 of file THistPainter.h.

Referenced by IsInside(), and MakeCuts().

TList* THistPainter::fFunctions
protected

Definition at line 48 of file THistPainter.h.

Referenced by DistancetoPrimitive(), MakeChopt(), Paint(), PaintBarH(), PaintFunction(), PaintH3(), PaintInit(), PaintInitH(), PaintPalette(), PaintStat(), PaintStat2(), PaintStat3(), PaintTable(), and SetHistogram().

TGraph2DPainter* THistPainter::fGraph2DPainter
protected

Definition at line 50 of file THistPainter.h.

Referenced by GetContourList(), PaintContour(), and PaintTriangles().

TH1* THistPainter::fH
protected

Definition at line 44 of file THistPainter.h.

Referenced by DefineColorLevels(), DistancetoPrimitive(), DrawPanel(), ExecuteEvent(), GetContourList(), GetObjectInfo(), MakeChopt(), Paint(), Paint2DErrors(), PaintArrows(), PaintBar(), PaintBarH(), PaintBoxes(), PaintCandlePlot(), PaintColorLevels(), PaintContour(), PaintErrors(), PaintFunction(), PaintH3(), PaintH3Iso(), PaintHist(), PaintInit(), PaintInitH(), PaintLego(), PaintLegoAxis(), PaintPalette(), PaintScatterPlot(), PaintStat(), PaintStat2(), PaintStat3(), PaintSurface(), PaintTable(), PaintText(), PaintTF3(), PaintTH2PolyBins(), PaintTH2PolyColorLevels(), PaintTH2PolyScatterPlot(), PaintTH2PolyText(), PaintTitle(), PaintTriangles(), PaintViolinPlot(), SetHistogram(), SetShowProjection(), ShowProjection3(), ShowProjectionX(), ShowProjectionY(), and TableInit().

TPainter3dAlgorithms* THistPainter::fLego
protected

Definition at line 49 of file THistPainter.h.

Referenced by DefineColorLevels(), Paint2DErrors(), PaintH3Iso(), PaintLego(), PaintSurface(), PaintTF3(), and PaintTriangles().

Int_t THistPainter::fNcuts
protected

Definition at line 54 of file THistPainter.h.

Referenced by IsInside(), and MakeCuts().

TPie* THistPainter::fPie
protected

Definition at line 51 of file THistPainter.h.

Referenced by DistancetoPrimitive(), ExecuteEvent(), and Paint().

TString THistPainter::fShowOption
protected

Definition at line 59 of file THistPainter.h.

Referenced by SetShowProjection(), and ShowProjection3().

Int_t THistPainter::fShowProjection
protected

Definition at line 58 of file THistPainter.h.

Referenced by ExecuteEvent(), SetShowProjection(), ShowProjection3(), ShowProjectionX(), and ShowProjectionY().

TList* THistPainter::fStack
protected

Definition at line 57 of file THistPainter.h.

Referenced by GetStack(), PaintLego(), and SetStack().

TAxis* THistPainter::fXaxis
protected

Definition at line 45 of file THistPainter.h.

Referenced by DistancetoPrimitive(), ExecuteEvent(), GetObjectInfo(), IsInside(), Paint2DErrors(), PaintArrows(), PaintAxis(), PaintBar(), PaintBarH(), PaintBoxes(), PaintCandlePlot(), PaintColorLevels(), PaintContour(), PaintErrors(), PaintHist(), PaintInit(), PaintInitH(), PaintLegoAxis(), PaintScatterPlot(), PaintStat(), PaintText(), PaintViolinPlot(), SetHistogram(), and TableInit().

Double_t* THistPainter::fXbuf
protected

Definition at line 52 of file THistPainter.h.

Referenced by Paint(), Paint2DErrors(), PaintArrows(), PaintH3Iso(), PaintLego(), PaintScatterPlot(), PaintSurface(), PaintTF3(), PaintTH2PolyScatterPlot(), and PaintTriangles().

TAxis* THistPainter::fYaxis
protected

Definition at line 46 of file THistPainter.h.

Referenced by DistancetoPrimitive(), GetObjectInfo(), IsInside(), Paint2DErrors(), PaintArrows(), PaintAxis(), PaintBarH(), PaintBoxes(), PaintCandlePlot(), PaintColorLevels(), PaintContour(), PaintLegoAxis(), PaintScatterPlot(), PaintText(), PaintViolinPlot(), SetHistogram(), and TableInit().

Double_t* THistPainter::fYbuf
protected

Definition at line 53 of file THistPainter.h.

Referenced by Paint(), Paint2DErrors(), PaintArrows(), PaintH3Iso(), PaintLego(), PaintScatterPlot(), PaintSurface(), PaintTF3(), PaintTH2PolyScatterPlot(), and PaintTriangles().

TAxis* THistPainter::fZaxis
protected

Definition at line 47 of file THistPainter.h.

Referenced by DistancetoPrimitive(), Paint2DErrors(), PaintH3Iso(), PaintLego(), PaintLegoAxis(), PaintSurface(), PaintTF3(), PaintTriangles(), and SetHistogram().

Collaboration diagram for THistPainter:
[legend]
The documentation for this class was generated from the following files: