ROOT   6.14/05 Reference Guide

The axis painter class.

Instances of this class are generated by the histograms and graphs painting classes when TAxis are drawn. TGaxis is the "painter class" of TAxis. Therefore it is mainly used via TAxis, even if is some occasion it can be used directly to draw an axis which is not part of a graph or an instance. For instance to draw an extra scale on a plot.

Basic definition

A TGaxis is defined the following way:

Double_t wmin, Double_t wmax, Int_t ndiv, Option_t *chopt,
Double_t gridlength)

Where:

• xmin : X origin coordinate in user's coordinates space.
• xmax : X end axis coordinate in user's coordinates space.
• ymin : Y origin coordinate in user's coordinates space.
• ymax : Y end axis coordinate in user's coordinates space.
• wmin : Lowest value for the tick mark labels written on the axis.
• wmax : Highest value for the tick mark labels written on the axis.
• ndiv : Number of divisions.
• ndiv=N1 + 100*N2 + 10000*N3
• N1=number of 1st divisions.
• N2=number of 2nd divisions.
• N3=number of 3rd divisions. e.g.:
• ndiv=0 –> no tick marks.
• ndiv=2 –> 2 divisions, one tick mark in the middle of the axis.
• chopt : Drawing options (see below).
• gridlength: grid length on main tick marks.

The example below generates various kind of axis.

{
TCanvas *c1 = new TCanvas("c1","Examples of TGaxis",10,10,700,500);
c1->Range(-10,-1,10,1);
TGaxis *axis1 = new TGaxis(-4.5,-0.2,5.5,-0.2,-6,8,510,"");
axis1->SetName("axis1");
axis1->Draw();
TGaxis *axis2 = new TGaxis(-4.5,0.2,5.5,0.2,0.001,10000,510,"G");
axis2->SetName("axis2");
axis2->Draw();
TGaxis *axis3 = new TGaxis(-9,-0.8,-9,0.8,-8,8,50510,"");
axis3->SetName("axis3");
axis3->Draw();
TGaxis *axis4 = new TGaxis(-7,-0.8,-7,0.8,1,10000,50510,"G");
axis4->SetName("axis4");
axis4->Draw();
TGaxis *axis5 = new TGaxis(-4.5,-0.6,5.5,-0.6,1.2,1.32,80506,"-+");
axis5->SetName("axis5");
axis5->SetLabelSize(0.03);
axis5->SetTextFont(72);
axis5->SetLabelOffset(0.025);
axis5->Draw();
TGaxis *axis6 = new TGaxis(-4.5,0.6,5.5,0.6,100,900,50510,"-");
axis6->SetName("axis6");
axis6->Draw();
TGaxis *axis7 = new TGaxis(8,-0.8,8,0.8,0,9000,50510,"+L");
axis7->SetName("axis7");
axis7->SetLabelOffset(0.01);
axis7->Draw();
//one can make axis going top->bottom. However because of a long standing
//problem, the two x values should not be equal
TGaxis *axis8 = new TGaxis(6.5,0.8,6.499,-0.8,0,90,50510,"-");
axis8->SetName("axis8");
axis8->Draw();
}

Definition with a function

Instead of the wmin,wmax arguments of the normal definition, the name of a TF1 function can be specified. This function will be used to map the user coordinates to the axis values and ticks.

A TGaxis is defined the following way:

const char *func, Int_t ndiv, Option_t *chopt,
Double_t gridlength)

Where:

• xmin : X origin coordinate in user's coordinates space.
• xmax : X end axis coordinate in user's coordinates space.
• ymin : Y origin coordinate in user's coordinates space.
• ymax : Y end axis coordinate in user's coordinates space.
• func : function defining axis labels and tick marks.
• ndiv : Number of divisions.
• ndiv=N1 + 100*N2 + 10000*N3
• N1=number of 1st divisions.
• N2=number of 2nd divisions.
• N3=number of 3rd divisions. e.g.:
• ndiv=0 –> no tick marks.
• ndiv=2 –> 2 divisions, one tick mark in the middle of the axis.
• chopt : Drawing options (see below).
• gridlength: grid length on main tick marks.

Examples:

{
TCanvas *c2 = new TCanvas("c2","c2",10,10,700,500);
TF1 *f1=new TF1("f1","-x",-10,10);
TGaxis *A1 = new TGaxis(0,2,10,2,"f1",510,"-");
A1->SetTitle("axis with decreasing values");
A1->Draw();
TF1 *f2=new TF1("f2","exp(x)",0,2);
TGaxis *A2 = new TGaxis(1,1,9,1,"f2");
A2->SetTitle("exponential axis");
A2->SetLabelSize(0.03);
A2->SetTitleSize(0.03);
A2->SetTitleOffset(1.2);
A2->Draw();
TF1 *f3=new TF1("f3","log10(x)",1,1000);
TGaxis *A3 = new TGaxis(2,-2,2,0,"f3",505,"G");
A3->SetTitle("logarithmic axis");
A3->SetLabelSize(0.03);
A3->SetTitleSize(0.03);
A3->SetTitleOffset(0.); // Axis title automatically placed
A3->Draw();
}

Logarithmic axis

By default axis are linear. To define a TGaxis as logarithmic, it is enough to create it with the option "G".

When plotting an histogram or a graph the logarithmic scale can be set using:

• gPad->SetLogx(1); set the logarithmic scale on the X axis
• gPad->SetLogy(1); set the logarithmic scale on the Y axis

When the SetMoreLogLabels() method is called more labels are drawn when in logarithmic scale and there is a small number of decades (less than 3).

Blank axis

To draw only the axis tick marks without the axis body, it is enough to specify the option "B". It useful to superpose axis.

Tick marks' orientation

By default tick marks are drawn on the positive side of the axis, except for vertical axis for which the default is negative. The chop parameter allows to control the tick marks orientation:

• chopt = "+": tick marks are drawn on Positive side. (default)
• chopt ="-": tick mark are drawn on the negative side.
• chopt = "+-": tick marks are drawn on both sides of the axis.
• chopt = "U": Unlabelled axis, default is labeled.

Tick marks' size

By default, tick marks have a length equal to 3 per cent of the axis length. When the option "S" is specified, the length of the tick marks is equal to fTickSize*axis_length, where fTickSize may be set via TGaxis::SetTickSize.

When plotting an histogram h the tick marks size can be changed using:

• h->GetXaxis()->SetTickLength(0.02); set the tick length for the X axis
• gStyle->SetTickLength(0.02,"x"); set the tick length for the X axis of all histograms drawn after this instruction.

A good way to remove tick marks on an axis is to set the tick length to 0: h->GetXaxis()->SetTickLength(0.);

Labels' positionning

Labels are normally drawn on side opposite to tick marks. However the option "=" allows to draw them on the same side. The distance between the labels and the axis body can be changed with SetLabelOffset.

Labels' orientation

By default axis labels are drawn parallel to the axis. However if the axis is vertical then are drawn perpendicular to the axis.

Labels' position on tick marks

By default axis labels are centered on tick marks. However, for vertical axis, they are right adjusted. The chop parameter allows to control the labels' position on tick marks:

• chopt = "R": labels are Right adjusted on tick mark.(default is centered)
• chopt = "L": labels are Left adjusted on tick mark.
• chopt = "C": labels are Centered on tick mark.
• chopt = "M": In the Middle of the divisions.

Labels' format

Blank characters are stripped, and then the label is correctly aligned. the dot, if last character of the string, is also stripped, unless the option "." (a dot, or period) is specified. if SetDecimals(kTRUE) has been called all labels have the same number of decimals after the "." The same is true if gStyle->SetStripDecimals(kFALSE) has been called.

In the following, we have some parameters, like tick marks length and characters height (in percentage of the length of the axis (user's coordinates)) The default values are as follows:

• Primary tick marks: 3.0 %
• Secondary tick marks: 1.5 %
• Third order tick marks: .75 %
• Characters height for labels: 4%
• Labels offset: 1.0 %

By default, an exponent of the form 10^N is used when the label values are either all very small or very large. One can disable the exponent by calling axis.SetNoExponent(kTRUE).

TGaxis::SetExponentOffset(Float_t xoff, Float_t yoff, Option_t *axis) is static function to set X and Y offset of the axis 10^n notation. It is in % of the pad size. It can be negative. axis specifies which axis ("x" or/and "y"), default is "x" if axis = "xz" set the two axes

Alphanumeric labels

Axis labels can be any alphanumeric character strings. Such axis can be produced only with histograms because the labels'definition is stored in TAxis. The following example demonstrates how to create such labels.

TCanvas *hlabels2()
{
const Int_t nx = 12;
const Int_t ny = 20;
const char *month[nx] = {"January","February","March","April","May",
"June","July","August","September","October","November",
"December"};
const char *people[ny] = {"Jean","Pierre","Marie","Odile","Sebastien",
"Fons","Rene","Nicolas","Xavier","Greg","Bjarne","Anton",
"Otto","Eddy","Peter","Pasha","Philippe","Suzanne","Jeff",
"Valery"};
TCanvas *c1 = new TCanvas("c1","demo bin labels",10,10,600,600);
c1->SetGrid();
c1->SetLeftMargin(0.15);
c1->SetBottomMargin(0.15);
TH2F *h = new TH2F("h","test",3,0,3,2,0,2);
h->SetStats(0);
for (Int_t i=0;i<15000;i++) {
Int_t rx = gRandom->Rndm()*nx;
Int_t ry = gRandom->Rndm()*ny;
h->Fill(people[ry],month[rx],1);
}
h->LabelsDeflate("X");
h->LabelsDeflate("Y");
h->LabelsOption("v");
h->Draw("text");
TPaveText *pt = new TPaveText(0.6,0.85,0.98,0.98,"brNDC");
pt->SetFillColor(18);
pt->SetTextAlign(12);
pt->AddText(" \"a\" to sort by alphabetic order");
pt->AddText(" \">\" to sort by decreasing values");
pt->AddText(" \"<\" to sort by increasing values");
pt->Draw();
return c1;
}

Because the alphanumeric labels are usually longer that the numeric labels, their size is by default equal to 0.66666 * the_numeric_labels_size.

Changing axis labels

Since
ROOT version 6.07/07:

After an axis has been created, TGaxis::ChangeLabel allows to define new text attributes for a given label. A fine tuning of the labels can be done. All the attributes can be changed as well as the text label itself.

When plotting an histogram or a graph the labels can be changed like in the following example which shows a way to produce $$\pi$$-axis :

{
TF1* f = new TF1("f","TMath::Cos(x/TMath::Pi())", -pi, pi);
TH1* h = f->GetHistogram();
TAxis* a = h->GetXaxis();
a->SetNdivisions(-502);
a->ChangeLabel(1,-1,-1,-1,-1,-1,"-#pi");
a->ChangeLabel(-1,-1,-1,-1,-1,-1,"#pi");
f->Draw();
}

Number of divisions optimisation

By default the number of divisions on axis is optimised to show a coherent labelling of the main tick marks. The number of division (ndiv) is a composite integer given by:

ndiv = N1 + 100*N2 + 10000*N3

• N1 = number of 1st divisions.
• N2 = number of 2nd divisions.
• N3 = number of 3rd divisions.

by default the value of N1, N2 and N3 are maximum values. After optimisation the real number of divisions will be smaller or equal to these value. If one wants to bypass the optimisation, the option "N" should be given when the TGaxis is created. The option "I" also act on the number of division as it will force an integer labelling of the axis.

On an histogram pointer h the number of divisions can be set in different ways:.

• Directly on the histogram. The following will set the number of division to 510 on the X axis of h. To avoid optimization the number of divisions should be negative (ie: -510);
h->SetNdivisions(510, "X");
• On the axis itself:

The first parameter is the number of division. If it is negative of if the second parameter is kFALSE then the number of divisions is not optimised. And other signature is also allowed:

h->GetXaxis()->SetNdivisions(10, 5, 0, kTRUE);

Maximum Number of Digits for the axis labels

The static function TGaxis::SetMaxDigits sets the maximum number of digits permitted for the axis labels above which the notation with 10^N is used. For example, to accept 6 digits number like 900000 on an axis call TGaxis::SetMaxDigits(6). The default value is 5. fgMaxDigits must be greater than 0.

Optional grid

The option "W" allows to draw a grid on the primary tick marks. In case of a log axis, the grid is only drawn for the primary tick marks if the number of secondary and tertiary divisions is 0. SetGridLength() allows to define the length of the grid.

When plotting an histogram or a graph the grid can be set ON or OFF using:

• gPad->SetGridy(1); set the grid on the X axis
• gPad->SetGridx(1); set the grid on the Y axis
• gPad->SetGrid(1,1); set the grid on both axis.

Time axis

Histograms' axis can be defined as "time axis". To do that it is enough to activate the TAxis::SetTimeDisplay attribute on a given axis. If h is an histogram, it is done the following way:

h->GetXaxis()->SetTimeDisplay(1); // The X axis is a time axis

Two parameters can be adjusted in order to define time axis:

The time format:

Defines the format of the labels along the time axis. It can be changed using the TAxis TAxis::SetTimeFormat. The time format is the one used by the C function strftime(). It's a string containing the following formatting characters:

• for date :
• a abbreviated weekday name
• b abbreviated month name
• d day of the month (01-31)
• m month (01-12)
• y year without century
• Y year with century
• for time :
• H hour (24-hour clock)
• I hour (12-hour clock)
• p local equivalent of AM or PM
• M minute (00-59)
• S seconds (00-61)
• %% %

The other characters are output as is. For example to have a format like dd/mm/yyyy one should do:

h->GetXaxis()->SetTimeFormat("%d\/%m\/%Y");

The time offset:

This is a time in seconds in the UNIX standard UTC format (this is an universal time, not the local time), defining the starting date of an histogram axis. This date should be greater than 01/01/95 and is given in seconds. There are three ways to define the time offset:

By setting the global default time offset:

TDatime da(2003,02,28,12,00,00);
gStyle->SetTimeOffset(da.Convert());

If no time offset is defined for a particular axis, the default time offset will be used. In the example above, notice the usage of TDateTime to translate an explicit date into the time in seconds required by TAxis::SetTimeFormat.

By setting a time offset to a particular axis:

TDatime dh(2001,09,23,15,00,00);
h->GetXaxis()->SetTimeOffset(dh.Convert());

Together with the time format using TAxis::SetTimeFormat:

The time offset can be specified using the control character F after the normal time format. F is followed by the date in the format: yyyy-mm-dd hh:mm:ss.

Example:

h->GetXaxis()->SetTimeFormat("%d\/%m\/%y%F2000-02-28 13:00:01");

Notice that this date format is the same used by the TDateString function AsSQLString. If needed, this function can be used to translate a time in seconds into a character string which can be appended after F. If the time format is not specified (before F), the automatic one will be used.

If a time axis has no specified time offset, the global time offset will be stored in the axis data structure.

The following example illustrates the various possibilities.

{
gStyle->SetTitleH(0.08);
TDatime da(2003,2,28,12,00,00);
gStyle->SetTimeOffset(da.Convert());
auto ct = new TCanvas("ct","Time on axis",0,0,600,600);
ct->Divide(1,3);
auto ht1 = new TH1F("ht1","ht1",30000,0.,200000.);
auto ht2 = new TH1F("ht2","ht2",30000,0.,200000.);
auto ht3 = new TH1F("ht3","ht3",30000,0.,200000.);
for (Int_t i=1;i<30000;i++) {
auto noise = gRandom->Gaus(0,120);
ht1->SetBinContent(i,noise);
ht2->SetBinContent(i,noise*noise);
ht3->SetBinContent(i,noise*noise*noise);
}
ct->cd(1);
ht1->GetXaxis()->SetLabelSize(0.06);
ht1->GetXaxis()->SetTimeDisplay(1);
ht1->GetXaxis()->SetTimeFormat("%d/%m/%y%F2000-02-28 13:00:01");
ht1->Draw();
ct->cd(2);
ht2->GetXaxis()->SetLabelSize(0.06);
ht2->GetXaxis()->SetTimeDisplay(1);
ht2->GetXaxis()->SetTimeFormat("%d/%m/%y");
ht2->Draw();
ct->cd(3);
ht3->GetXaxis()->SetLabelSize(0.06);
TDatime dh(2001,9,23,15,00,00);
ht3->GetXaxis()->SetTimeDisplay(1);
ht3->GetXaxis()->SetTimeOffset(dh.Convert());
ht3->Draw();
}

The histogram limits times in seconds. If wmin and wmax are the histogram limits, the time axis will spread around the time offset value from TimeOffset+wmin to TimeOffset+wmax. Until now all the examples had a lowest value equal to 0. The following example demonstrates how to define the histogram limits relatively to the time offset value.

{
// Define the time offset as 2003, January 1st
TDatime T0(2003,1,1,0,0,0);
auto X0 = T0.Convert();
// Define the lowest histogram limit as 2002, September 23rd
TDatime T1(2002,9,23,0,0,0);
auto X1 = T1.Convert()-X0;
// Define the highest histogram limit as 2003, March 7th
TDatime T2(2003,3,7,0,0,0);
auto X2 = T2.Convert(1)-X0;
auto h1 = new TH1F("h1","test",100,X1,X2);
for (Int_t i=0;i<30000;i++) {
Double_t noise = r.Gaus(0.5*(X1+X2),0.1*(X2-X1));
h1->Fill(noise);
}
h1->GetXaxis()->SetLabelSize(0.03);
h1->GetXaxis()->SetTimeFormat("%Y/%m/%d");
h1->Draw();
}

Usually time axis are created automatically via histograms, but one may also want to draw a time axis outside an "histogram context". Therefore it is useful to understand how TGaxis works for such axis.

The time offset can be defined using one of the three methods described before. The time axis will spread around the time offset value. Actually it will go from TimeOffset+wmin to TimeOffset+wmax where wmin and wmax are the minimum and maximum values (in seconds) of the axis. Let's take again an example. Having defined "2003, February 28 at 12h" we would like to see the axis a day before and a day after. A TGaxis can be created the following way (a day has 86400 seconds):

TGaxis *axis = new TGaxis(x1,y1,x2,y2,-100000,150000,2405,"t");

the t option (in lower case) means it is a "time axis". The axis goes form 100000 seconds before TimeOffset and 150000 seconds after.

So the complete macro is:

{
c1 = new TCanvas("c1","Examples of TGaxis",10,10,700,100);
c1->Range(-10,-1,10,1);
TGaxis *axis = new TGaxis(-8,0.,8,0.,-100000,150000,2405,"tS");
axis->SetLabelSize(0.2);
axis->SetTickSize(0.2);
TDatime da(2003,02,28,12,00,00);
axis->SetTimeOffset(da.Convert());
axis->SetTimeFormat("%d-%m-%Y");
axis->Draw();
return c1;
}

Thanks to the TLatex directive splitline it is possible to write the time labels on two lines. In the previous example changing the SetTimeFormat line by

axis->SetLabelOffset(0.15);
axis->SetTimeFormat("#splitline{%Y}{%d\/%m}");

will produce the following axis:

The following example shows time axis on a TGraph:

{
TDatime da1(2008,02,28,15,52,00);
TDatime da2(2008,02,28,15,53,00);
double x[2],y[2];
y[0] = 1.;
y[1] = 2.;
x[0] = da1.Convert();
x[1] = da2.Convert();
TGraph mgr(2,x,y);
mgr.SetMarkerStyle(20);
mgr.Draw("apl");
mgr.GetXaxis()->SetTimeDisplay(1);
mgr.GetXaxis()->SetNdivisions(-503);
mgr.GetXaxis()->SetTimeFormat("%Y-%m-%d %H:%M");
mgr.GetXaxis()->SetTimeOffset(0,"gmt");
}

The following example compares what the system time function gmtime and localtime give with what gives TGaxis. It can be used as referenced test to check if the time option of TGaxis is working properly.

#if defined(G__WIN32) && defined(__CINT__) && !defined(__MAKECINT__)
{
// timeonaxis3.C has to be run in compiled mode on Windows.
// the following code does it.
gSystem->CompileMacro("timeonaxis3.C");
timeonaxis3();
}
#else
#include "TAxis.h"
#include "TGaxis.h"
#include "TCanvas.h"
#include "TString.h"
#include "TLine.h"
#include "TLatex.h"
#include <time.h>
#include <stdio.h>
TString stime(time_t* t, bool utc = false, bool display_time_zone = true) {
struct tm* tt;
if (utc) tt = gmtime(t);
else tt = localtime(t);
char buf[256];
if (display_time_zone) strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S %Z", tt);
else strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tt);
return TString(buf);
}
TCanvas *timeonaxis3() {
double f = 1.8;
TCanvas* c = new TCanvas;
TLatex* tex1 = new TLatex;
tex1->SetNDC();
tex1->SetTextFont(102);
tex1->SetTextSize(0.055*f);
TLatex* tex3 = new TLatex;
tex3->SetNDC();
tex3->SetTextFont(102);
tex3->SetTextSize(0.07*f);
tex3->SetTextColor(kBlue+2);
TLatex* tex2 = new TLatex;
tex2->SetNDC();
tex2->SetTextFont(102);
tex2->SetTextSize(0.07*f);
time_t offset[] = {0, 0, 1325376000, 1341100800};
time_t t[] = {1331150400, 1336417200, 0, 36000};
c->Divide(2, 4, -1, -1);
l.DrawLine(0.5, 0, 0.5, 1.);
for(int i = 0; i < 4; ++i){
for(int gmt = 0; gmt < 2; ++gmt){
const char* opt = (gmt ? "gmt" : "local");
TVirtualPad* p = c->cd(2*i + gmt + 1);
p->SetFillStyle(4000);
TGaxis* ga = new TGaxis (.4, .25, 5., .25, t[i], t[i] + 1, 1, "t");
ga->SetTimeFormat("TGaxis label: #color[2]{%Y-%m-%d %H:%M:%S}");
ga->SetLabelFont(102);
ga->SetLabelColor(kBlue+2);
ga->SetTimeOffset(offset[i], opt);
ga->SetLabelOffset(0.04*f);
ga->SetLabelSize(0.07*f);
ga->SetLineColor(0);
ga->Draw();
// Get offset string of axis time format: there is not accessor
// to time format in TGaxis.
// Assumes TAxis use the same format.
TAxis a(10, 0, 1600000000);
a.SetTimeOffset(offset[i], opt);
const char* offsettimeformat = a.GetTimeFormat();
char buf[256];
if (offset[i] < t[i]) {
sprintf(buf, "#splitline{%s, %s}{offset: %ld, option %s}",
stime(t+i).Data(), stime(t+i, true).Data(), offset[i], opt);
} else {
int h = t[i] / 3600;
int m = (t[i] - 3600 * h) / 60 ;
int s = (t[i] - h * 3600 - m * 60);
sprintf(buf, "#splitline{%d h %d m %d s}{offset: %s, option %s}",
h, m, s, stime(offset + i, gmt).Data(), opt);
}
tex1->DrawLatex(.01, .75, buf);
tex2->DrawLatex(.01, .50, offsettimeformat);
time_t t_ = t[i] + offset[i];
sprintf(buf, "Expecting: #color[2]{%s}", stime(&t_, gmt, false).Data());
tex3->DrawLatex(.01, .24, buf);
if(i > 0) l.DrawLine(0, 0.95, 1, 0.95);
}
}
return c;
}
#endif

The following macro illustrates the use, with histograms axis, of the time mode on the axis with different time intervals and time formats.

#include <time.h>
TCanvas *timeonaxis()
{
time_t script_time;
script_time = time(0);
script_time = 3600*(int)(script_time/3600);
// The time offset is the one that will be used by all graphs.
// If one changes it, it will be changed even on the graphs already defined
gStyle->SetTimeOffset(script_time);
TCanvas *ct = new TCanvas("ct","Time on axis",10,10,700,900);
ct->Divide(1,3);
int i;
//### Build a signal : noisy damped sine
// Time interval : 30 minutes
gStyle->SetTitleH(0.08);
float noise;
TH1F *ht = new TH1F("ht","Love at first sight",3000,0.,2000.);
for (i=1;i<3000;i++) {
noise = gRandom->Gaus(0,120);
if (i>700) {
noise += 1000*sin((i-700)*6.28/30)*exp((double)(700-i)/300);
}
ht->SetBinContent(i,noise);
}
ct->cd(1);
ht->SetLineColor(2);
ht->GetXaxis()->SetLabelSize(0.05);
ht->Draw();
// Sets time on the X axis
// The time used is the one set as time offset added to the value
// of the axis. This is converted into day/month/year hour:min:sec and
// a reasonable tick interval value is chosen.
//### Build a simple graph beginning at a different time
// Time interval : 5 seconds
float x[100], t[100];
for (i=0;i<100;i++) {
x[i] = sin(i*4*3.1415926/50)*exp(-(double)i/20);
t[i] = 6000+(double)i/20;
}
TGraph *gt = new TGraph(100,t,x);
gt->SetTitle("Politics");
ct->cd(2);
gt->SetLineColor(5);
gt->SetLineWidth(2);
gt->Draw("AL");
gt->GetXaxis()->SetLabelSize(0.05);
// Sets time on the X axis
//### Build a second simple graph for a very long time interval
// Time interval : a few years
float x2[10], t2[10];
for (i=0;i<10;i++) {
x2[i] = gRandom->Gaus(500,100)*i;
t2[i] = i*365*86400;
}
TGraph *gt2 = new TGraph(10,t2,x2);
gt2->SetTitle("Number of monkeys on the moon");
ct->cd(3);
gt2->SetMarkerColor(4);
gt2->SetMarkerStyle(29);
gt2->SetMarkerSize(1.3);
gt2->Draw("AP");
gt2->GetXaxis()->SetLabelSize(0.05);
// Sets time on the X axis
//
// One can choose a different time format than the one chosen by default
// The time format is the same as the one of the C strftime() function
// It's a string containing the following formats :
//
// for date :
// %a abbreviated weekday name
// %b abbreviated month name
// %d day of the month (01-31)
// %m month (01-12)
// %y year without century
// %Y year with century
//
// for time :
// %H hour (24-hour clock)
// %I hour (12-hour clock)
// %p local equivalent of AM or PM
// %M minute (00-59)
// %S seconds (00-61)
// %% %
// The other characters are output as is.
gt2->GetXaxis()->SetTimeFormat("y. %Y %F2000-01-01 00:00:00");
return ct;
}

Definition at line 24 of file TGaxis.h.

Public Member Functions

TGaxis ()
TGaxis default constructor. More...

TGaxis (Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t wmin, Double_t wmax, Int_t ndiv=510, Option_t *chopt="", Double_t gridlength=0)
TGaxis normal constructor. More...

TGaxis (Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, const char *funcname, Int_t ndiv=510, Option_t *chopt="", Double_t gridlength=0)
Constructor with a TF1 to map axis values. More...

virtual ~TGaxis ()
TGaxis default destructor. More...

virtual void AdjustBinSize (Double_t A1, Double_t A2, Int_t nold, Double_t &BinLow, Double_t &BinHigh, Int_t &nbins, Double_t &BinWidth)
Internal method for axis labels optimisation. More...

virtual void CenterLabels (Bool_t center=kTRUE)
If center = kTRUE axis labels are centered in the center of the bin. More...

virtual void CenterTitle (Bool_t center=kTRUE)
If center = kTRUE axis title will be centered. The default is right adjusted. More...

void ChangeLabel (Int_t labNum=0, Double_t labAngle=-1., Double_t labSize=-1., Int_t labAlign=-1, Int_t labColor=-1, Int_t labFont=-1, TString labText="")

void ChangeLabelAttributes (Int_t i, Int_t nlabels, TLatex *t, char *c)

virtual void DrawAxis (Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t wmin, Double_t wmax, Int_t ndiv=510, Option_t *chopt="", Double_t gridlength=0)
Draw this axis with new attributes. More...

TF1GetFunction () const

Float_t GetGridLength () const

Int_t GetLabelColor () const

Int_t GetLabelFont () const

Float_t GetLabelOffset () const

Float_t GetLabelSize () const

virtual const char * GetName () const
Returns name of object. More...

Int_t GetNdiv () const

virtual const char * GetOption () const

Float_t GetTickSize () const

virtual const char * GetTitle () const
Returns title of object. More...

Float_t GetTitleOffset () const

Float_t GetTitleSize () const

Double_t GetWmax () const

Double_t GetWmin () const

virtual void ImportAxisAttributes (TAxis *axis)
Internal method to import TAxis attributes to this TGaxis. More...

void LabelsLimits (const char *label, Int_t &first, Int_t &last)
Internal method to find first and last character of a label. More...

virtual void Paint (Option_t *chopt="")
Draw this axis with its current attributes. More...

virtual void PaintAxis (Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t &wmin, Double_t &wmax, Int_t &ndiv, Option_t *chopt="", Double_t gridlength=0, Bool_t drawGridOnly=kFALSE)
Control function to draw an axis. More...

void ResetLabelAttributes (TLatex *t)
Reset the label attributes to the value they have before the last call to ChangeLabelAttributes. More...

virtual void Rotate (Double_t X, Double_t Y, Double_t CFI, Double_t SFI, Double_t XT, Double_t YT, Double_t &U, Double_t &V)
Internal method to rotate axis coordinates. More...

virtual void SavePrimitive (std::ostream &out, Option_t *option="")
Save primitive as a C++ statement(s) on output stream out. More...

virtual void SetDecimals (Bool_t dot=kTRUE)
Set the decimals flag. More...

void SetFunction (const char *funcname="")
Specify a function to map the axis values. More...

void SetGridLength (Float_t gridlength)

void SetLabelColor (Int_t labelcolor)

void SetLabelFont (Int_t labelfont)

void SetLabelOffset (Float_t labeloffset)

void SetLabelSize (Float_t labelsize)

virtual void SetMoreLogLabels (Bool_t more=kTRUE)
Set the kMoreLogLabels bit flag. More...

virtual void SetName (const char *name)
Change the name of the axis. More...

virtual void SetNdivisions (Int_t ndiv)

virtual void SetNoExponent (Bool_t noExponent=kTRUE)
Set the NoExponent flag. More...

void SetOption (Option_t *option="")
To set axis options. More...

void SetTickLength (Float_t ticklength)

void SetTickSize (Float_t ticksize)

void SetTimeFormat (const char *tformat)
Change the format used for time plotting. More...

void SetTimeOffset (Double_t toffset, Option_t *option="local")
Change the time offset. If option = "gmt", set display mode to GMT. More...

virtual void SetTitle (const char *title="")
Change the title of the axis. More...

void SetTitleColor (Int_t titlecolor)

void SetTitleFont (Int_t titlefont)

void SetTitleOffset (Float_t titleoffset=1)

void SetTitleSize (Float_t titlesize)

void SetWmax (Double_t wmax)

void SetWmin (Double_t wmin)

Public Member Functions inherited from TLine
TLine ()
Line default constructor. More...

TLine (Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Line normal constructor. More...

TLine (const TLine &line)
Line copy constructor. More...

virtual ~TLine ()
Line default destructor. More...

void Copy (TObject &line) const
Copy this line to line. More...

virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
Compute distance from point px,py to a line. More...

virtual TLineDrawLine (Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Draw this line with new coordinates. More...

virtual TLineDrawLineNDC (Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Draw this line with new coordinates in NDC. More...

virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
Execute action corresponding to one event. More...

virtual Rectangle_t GetBBox ()
Return the bounding Box of the Line. More...

virtual TPoint GetBBoxCenter ()
Return the center of the BoundingBox as TPoint in pixels. More...

Double_t GetX1 () const

Double_t GetX2 () const

Double_t GetY1 () const

Double_t GetY2 () const

Bool_t IsHorizontal ()
Check whether this line is to be drawn horizontally. More...

Bool_t IsVertical ()
Check whether this line is to be drawn vertically. More...

virtual void ls (Option_t *option="") const
List this line with its attributes. More...

virtual void PaintLine (Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Draw this line with new coordinates. More...

virtual void PaintLineNDC (Double_t u1, Double_t v1, Double_t u2, Double_t v2)
Draw this line with new coordinates in NDC. More...

virtual void Print (Option_t *option="") const
Dump this line with its attributes. More...

virtual void SetBBoxCenter (const TPoint &p)
Set center of the BoundingBox. More...

virtual void SetBBoxCenterX (const Int_t x)
Set X coordinate of the center of the BoundingBox. More...

virtual void SetBBoxCenterY (const Int_t y)
Set Y coordinate of the center of the BoundingBox. More...

virtual void SetBBoxX1 (const Int_t x)
Set left hand side of BoundingBox to a value (resize in x direction on left) More...

virtual void SetBBoxX2 (const Int_t x)
Set right hand side of BoundingBox to a value (resize in x direction on right) More...

virtual void SetBBoxY1 (const Int_t y)
Set top of BoundingBox to a value (resize in y direction on top) More...

virtual void SetBBoxY2 (const Int_t y)
Set bottom of BoundingBox to a value (resize in y direction on bottom) More...

void SetHorizontal (Bool_t set=kTRUE)
Force the line to be drawn horizontally. More...

virtual void SetNDC (Bool_t isNDC=kTRUE)
Set NDC mode on if isNDC = kTRUE, off otherwise. More...

void SetVertical (Bool_t set=kTRUE)
Force the line to be drawn vertically. More...

virtual void SetX1 (Double_t x1)

virtual void SetX2 (Double_t x2)

virtual void SetY1 (Double_t y1)

virtual void SetY2 (Double_t y2)

Public Member Functions inherited from TObject
TObject ()
TObject constructor. More...

TObject (const TObject &object)
TObject copy ctor. More...

virtual ~TObject ()
TObject destructor. 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...

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...

ULong_t CheckedHash ()
Checked and record whether for this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. More...

virtual const char * ClassName () const
Returns name of class to which the object belongs. More...

virtual void Clear (Option_t *="")

virtual TObjectClone (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 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 TObjectDrawClone (Option_t *option="") const
Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad). More...

virtual void Dump () const
Dump contents of object on stdout. More...

virtual void Error (const char *method, const char *msgfmt,...) const
Issue error message. 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 void Fatal (const char *method, const char *msgfmt,...) const
Issue fatal error message. More...

virtual TObjectFindObject (const char *name) const
Must be redefined in derived classes. More...

virtual TObjectFindObject (const TObject *obj) const
Must be redefined in derived classes. More...

virtual Option_tGetDrawOption () const
Get option used by the graphics system to draw this object. More...

virtual const char * GetIconName () const
Returns mime type name of object. More...

virtual char * GetObjectInfo (Int_t px, Int_t py) const
Returns string containing info about the object at position (px,py). More...

virtual UInt_t GetUniqueID () const
Return the unique object id. 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...

Bool_t HasInconsistentHash () const
Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. More...

virtual void Info (const char *method, const char *msgfmt,...) const
Issue info message. 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...

void InvertBit (UInt_t f)

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 IsFolder () const
Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

R__ALWAYS_INLINE Bool_t IsOnHeap () const

virtual Bool_t IsSortable () const

R__ALWAYS_INLINE Bool_t IsZombie () const

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...

virtual Bool_t Notify ()
This method must be overridden to handle object notification. More...

void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
Use this method to declare a method obsolete. More...

void operator delete (void *ptr)
Operator delete. More...

void operator delete[] (void *ptr)
Operator delete []. More...

voidoperator new (size_t sz)

voidoperator new (size_t sz, void *vp)

voidoperator new[] (size_t sz)

voidoperator new[] (size_t sz, void *vp)

TObjectoperator= (const TObject &rhs)
TObject assignment operator. More...

virtual void Pop ()
Pop on object drawn in a pad to the top of the display list. More...

virtual Int_t Read (const char *name)
Read contents of object with specified name from the current directory. More...

virtual void RecursiveRemove (TObject *obj)
Recursively remove this object from a list. More...

void ResetBit (UInt_t f)

virtual void SaveAs (const char *filename="", Option_t *option="") const
Save this object in the file specified by filename. 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)

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 SysError (const char *method, const char *msgfmt,...) const
Issue system error message. More...

R__ALWAYS_INLINE Bool_t TestBit (UInt_t f) const

Int_t TestBits (UInt_t f) const

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 void Warning (const char *method, const char *msgfmt,...) const
Issue warning message. 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...

Public Member Functions inherited from TAttLine
TAttLine ()
AttLine default constructor. More...

TAttLine (Color_t lcolor, Style_t lstyle, Width_t lwidth)
AttLine normal constructor. More...

virtual ~TAttLine ()
AttLine destructor. More...

void Copy (TAttLine &attline) const
Copy this line attributes to a new TAttLine. More...

Int_t DistancetoLine (Int_t px, Int_t py, Double_t xp1, Double_t yp1, Double_t xp2, Double_t yp2)
Compute distance from point px,py to a line. More...

virtual Color_t GetLineColor () const
Return the line color. More...

virtual Style_t GetLineStyle () const
Return the line style. More...

virtual Width_t GetLineWidth () const
Return the line width. More...

virtual void Modify ()
Change current line attributes if necessary. More...

virtual void ResetAttLine (Option_t *option="")
Reset this line attributes to default values. More...

virtual void SaveLineAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1, Int_t widdef=1)
Save line attributes as C++ statement(s) on output stream out. More...

virtual void SetLineAttributes ()
Invoke the DialogCanvas Line attributes. More...

virtual void SetLineColor (Color_t lcolor)
Set the line color. More...

virtual void SetLineColorAlpha (Color_t lcolor, Float_t lalpha)
Set a transparent line color. More...

virtual void SetLineStyle (Style_t lstyle)
Set the line style. More...

virtual void SetLineWidth (Width_t lwidth)
Set the line width. More...

Public Member Functions inherited from TAttBBox2D
virtual ~TAttBBox2D ()

Public Member Functions inherited from TAttText
TAttText ()
AttText default constructor. More...

TAttText (Int_t align, Float_t angle, Color_t color, Style_t font, Float_t tsize)
AttText normal constructor. More...

virtual ~TAttText ()
AttText destructor. More...

void Copy (TAttText &atttext) const
Copy this text attributes to a new TAttText. More...

virtual Short_t GetTextAlign () const
Return the text alignment. More...

virtual Float_t GetTextAngle () const
Return the text angle. More...

virtual Color_t GetTextColor () const
Return the text color. More...

virtual Font_t GetTextFont () const
Return the text font. More...

virtual Float_t GetTextSize () const
Return the text size. More...

virtual void Modify ()
Change current text attributes if necessary. More...

virtual void ResetAttText (Option_t *toption="")
Reset this text attributes to default values. More...

virtual void SaveTextAttributes (std::ostream &out, const char *name, Int_t alidef=12, Float_t angdef=0, Int_t coldef=1, Int_t fondef=61, Float_t sizdef=1)
Save text attributes as C++ statement(s) on output stream out. More...

virtual void SetTextAlign (Short_t align=11)
Set the text alignment. More...

virtual void SetTextAngle (Float_t tangle=0)
Set the text angle. More...

virtual void SetTextAttributes ()
Invoke the DialogCanvas Text attributes. More...

virtual void SetTextColor (Color_t tcolor=1)
Set the text color. More...

virtual void SetTextColorAlpha (Color_t tcolor, Float_t talpha)
Set a transparent marker color. More...

virtual void SetTextFont (Font_t tfont=62)
Set the text font. More...

virtual void SetTextSize (Float_t tsize=1)
Set the text size. More...

virtual void SetTextSizePixels (Int_t npixels)
Set the text size in pixels. More...

Static Public Member Functions

static Int_t GetMaxDigits ()
Static function returning fgMaxDigits (See SetMaxDigits). More...

static void SetExponentOffset (Float_t xoff=0., Float_t yoff=0., Option_t *axis="xy")
Static function to set X and Y offset of the axis 10^n notation. More...

static void SetMaxDigits (Int_t maxd=5)
Static function to set fgMaxDigits for axis. More...

Static Public Member Functions inherited from TObject
static Long_t GetDtorOnly ()
Return destructor only flag. More...

static Bool_t GetObjectStat ()
Get status of object stat flag. More...

static void SetDtorOnly (void *obj)
Set destructor only flag. More...

static void SetObjectStat (Bool_t stat)
Turn on/off tracking of objects in the TObjectTable. More...

Protected Member Functions

TGaxis (const TGaxis &)
Copy constructor. More...

TGaxisoperator= (const TGaxis &)
Assignment operator. More...

Protected Member Functions inherited from TObject
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
Interface to ErrorHandler (protected). More...

void MakeZombie ()

Protected Attributes

TAxisfAxis
! Pointer to original TAxis axis (if any) More...

TString fChopt
Axis options. More...

TF1fFunction
! Pointer to function computing axis values More...

TString fFunctionName
Name of mapping function pointed by fFunction. More...

Float_t fGridLength
Length of the grid in NDC. More...

Int_t fLabelColor
Color for labels. More...

Int_t fLabelFont
Font for labels. More...

Float_t fLabelOffset
Offset of label wrt axis. More...

Float_t fLabelSize
Size of labels in NDC. More...

TListfModLabs
List of modified labels. More...

TString fName
Axis name. More...

Int_t fNdiv
Number of divisions. More...

Int_t fNModLabs
Number of modified labels. More...

Float_t fTickSize
Size of primary tick mark in NDC. More...

TString fTimeFormat
Time format, ex: 09/12/99 12:34:00. More...

TString fTitle
Axis title. More...

Float_t fTitleOffset
Offset of title wrt axis. More...

Float_t fTitleSize
Size of title in NDC. More...

Double_t fWmax
Highest value on the axis. More...

Double_t fWmin
Lowest value on the axis. More...

Protected Attributes inherited from TLine
Double_t fX1
X of 1st point. More...

Double_t fX2
X of 2nd point. More...

Double_t fY1
Y of 1st point. More...

Double_t fY2
Y of 2nd point. More...

Protected Attributes inherited from TAttLine
Color_t fLineColor
Line color. More...

Style_t fLineStyle
Line style. More...

Width_t fLineWidth
Line width. More...

Protected Attributes inherited from TAttText
Short_t fTextAlign
Text alignment. More...

Float_t fTextAngle
Text angle. More...

Color_t fTextColor
Text color. More...

Font_t fTextFont
Text font. More...

Float_t fTextSize
Text size. More...

Static Protected Attributes

static Int_t fgMaxDigits = 5
! Number of digits above which the 10>N notation is used More...

static Float_t fXAxisExpXOffset = 0.
! Exponent X offset for the X axis More...

static Float_t fXAxisExpYOffset = 0.
! Exponent Y offset for the X axis More...

static Float_t fYAxisExpXOffset = 0.
! Exponent X offset for the Y axis More...

static Float_t fYAxisExpYOffset = 0.
! Exponent Y offset for the Y axis More...

Public Types inherited from TLine
enum  { kLineNDC = BIT(14), kVertical = BIT(15), kHorizontal = BIT(16) }

Public Types inherited from TObject
enum  {
kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000,
}

enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

enum  EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

enum  EStatusBits {
kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5),
kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}

#include <TGaxis.h>

Inheritance diagram for TGaxis:
[legend]

◆ TGaxis() [1/4]

 TGaxis::TGaxis ( const TGaxis & ax )
protected

Copy constructor.

Definition at line 776 of file TGaxis.cxx.

◆ TGaxis() [2/4]

 TGaxis::TGaxis ( )

TGaxis default constructor.

Definition at line 680 of file TGaxis.cxx.

◆ TGaxis() [3/4]

 TGaxis::TGaxis ( Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t wmin, Double_t wmax, Int_t ndiv = 510, Option_t * chopt = "", Double_t gridlength = 0 )

TGaxis normal constructor.

Definition at line 708 of file TGaxis.cxx.

◆ TGaxis() [4/4]

 TGaxis::TGaxis ( Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, const char * funcname, Int_t ndiv = 510, Option_t * chopt = "", Double_t gridlength = 0 )

Constructor with a TF1 to map axis values.

Definition at line 739 of file TGaxis.cxx.

◆ ~TGaxis()

 TGaxis::~TGaxis ( )
virtual

TGaxis default destructor.

Definition at line 838 of file TGaxis.cxx.

Member Function Documentation

 void TGaxis::AdjustBinSize ( Double_t A1, Double_t A2, Int_t nold, Double_t & binLow, Double_t & binHigh, Int_t & nbins, Double_t & binWidth )
virtual

Internal method for axis labels optimisation.

This method adjusts the bining of the axis in order to have integer values for the labels.

Parameters
 [in] A1,A2 Old WMIN,WMAX [out] binLow,binHigh New WMIN,WMAX [in] nold Old NDIV (primary divisions) [out] nbins New NDIV [out] binWidth Bin width

Definition at line 2370 of file TGaxis.cxx.

◆ CenterLabels()

 void TGaxis::CenterLabels ( Bool_t center = kTRUE )
virtual

If center = kTRUE axis labels are centered in the center of the bin.

The default is to center on the primary tick marks. This option does not make sense if there are more bins than tick marks.

Definition at line 847 of file TGaxis.cxx.

◆ CenterTitle()

 void TGaxis::CenterTitle ( Bool_t center = kTRUE )
virtual

If center = kTRUE axis title will be centered. The default is right adjusted.

Definition at line 857 of file TGaxis.cxx.

◆ ChangeLabel()

 void TGaxis::ChangeLabel ( Int_t labNum = 0, Double_t labAngle = -1., Double_t labSize = -1., Int_t labAlign = -1, Int_t labColor = -1, Int_t labFont = -1, TString labText = "" )

◆ ChangeLabelAttributes()

 void TGaxis::ChangeLabelAttributes ( Int_t i, Int_t nlabels, TLatex * t, char * c )

Definition at line 2596 of file TGaxis.cxx.

◆ DrawAxis()

 void TGaxis::DrawAxis ( Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t wmin, Double_t wmax, Int_t ndiv = 510, Option_t * chopt = "", Double_t gridlength = 0 )
virtual

Draw this axis with new attributes.

Definition at line 867 of file TGaxis.cxx.

◆ GetFunction()

 TF1* TGaxis::GetFunction ( ) const
inline

Definition at line 78 of file TGaxis.h.

◆ GetGridLength()

 Float_t TGaxis::GetGridLength ( ) const
inline

Definition at line 77 of file TGaxis.h.

◆ GetLabelColor()

 Int_t TGaxis::GetLabelColor ( ) const
inline

Definition at line 79 of file TGaxis.h.

◆ GetLabelFont()

 Int_t TGaxis::GetLabelFont ( ) const
inline

Definition at line 80 of file TGaxis.h.

◆ GetLabelOffset()

 Float_t TGaxis::GetLabelOffset ( ) const
inline

Definition at line 81 of file TGaxis.h.

◆ GetLabelSize()

 Float_t TGaxis::GetLabelSize ( ) const
inline

Definition at line 82 of file TGaxis.h.

◆ GetMaxDigits()

 Int_t TGaxis::GetMaxDigits ( )
static

Static function returning fgMaxDigits (See SetMaxDigits).

Definition at line 897 of file TGaxis.cxx.

◆ GetName()

 virtual const char* TGaxis::GetName ( ) const
inlinevirtual

Returns name of object.

This default method returns the class name. Classes that give objects a name should override this method.

Reimplemented from TObject.

Definition at line 85 of file TGaxis.h.

◆ GetNdiv()

 Int_t TGaxis::GetNdiv ( ) const
inline

Definition at line 89 of file TGaxis.h.

◆ GetOption()

 virtual const char* TGaxis::GetOption ( ) const
inlinevirtual

Reimplemented from TObject.

Definition at line 86 of file TGaxis.h.

◆ GetTickSize()

 Float_t TGaxis::GetTickSize ( ) const
inline

Definition at line 92 of file TGaxis.h.

◆ GetTitle()

 virtual const char* TGaxis::GetTitle ( ) const
inlinevirtual

Returns title of object.

This default method returns the class title (i.e. description). Classes that give objects a title should override this method.

Reimplemented from TObject.

Definition at line 87 of file TGaxis.h.

◆ GetTitleOffset()

 Float_t TGaxis::GetTitleOffset ( ) const
inline

Definition at line 83 of file TGaxis.h.

◆ GetTitleSize()

 Float_t TGaxis::GetTitleSize ( ) const
inline

Definition at line 84 of file TGaxis.h.

◆ GetWmax()

 Double_t TGaxis::GetWmax ( ) const
inline

Definition at line 91 of file TGaxis.h.

◆ GetWmin()

 Double_t TGaxis::GetWmin ( ) const
inline

Definition at line 90 of file TGaxis.h.

◆ ImportAxisAttributes()

 void TGaxis::ImportAxisAttributes ( TAxis * axis )
virtual

Internal method to import TAxis attributes to this TGaxis.

Definition at line 906 of file TGaxis.cxx.

◆ LabelsLimits()

 void TGaxis::LabelsLimits ( const char * label, Int_t & first, Int_t & last )

Internal method to find first and last character of a label.

Definition at line 2405 of file TGaxis.cxx.

◆ operator=()

 TGaxis & TGaxis::operator= ( const TGaxis & ax )
protected

Assignment operator.

Definition at line 805 of file TGaxis.cxx.

◆ Paint()

 void TGaxis::Paint ( Option_t * chopt = "" )
virtual

Draw this axis with its current attributes.

Reimplemented from TLine.

Definition at line 935 of file TGaxis.cxx.

◆ PaintAxis()

 void TGaxis::PaintAxis ( Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax, Double_t & wmin, Double_t & wmax, Int_t & ndiv, Option_t * chopt = "", Double_t gridlength = 0, Bool_t drawGridOnly = kFALSE )
virtual

Control function to draw an axis.

Original authors: O.Couet C.E.Vandoni N.Cremel-Somon. Modified and converted to C++ class by Rene Brun.

Definition at line 956 of file TGaxis.cxx.

◆ ResetLabelAttributes()

 void TGaxis::ResetLabelAttributes ( TLatex * t )

Reset the label attributes to the value they have before the last call to ChangeLabelAttributes.

Definition at line 2627 of file TGaxis.cxx.

◆ Rotate()

 void TGaxis::Rotate ( Double_t X, Double_t Y, Double_t CFI, Double_t SFI, Double_t XT, Double_t YT, Double_t & U, Double_t & V )
virtual

Internal method to rotate axis coordinates.

Definition at line 2417 of file TGaxis.cxx.

◆ SavePrimitive()

 void TGaxis::SavePrimitive ( std::ostream & out, Option_t * option = "" )
virtual

Save primitive as a C++ statement(s) on output stream out.

Reimplemented from TLine.

Definition at line 2427 of file TGaxis.cxx.

◆ SetDecimals()

 void TGaxis::SetDecimals ( Bool_t dot = kTRUE )
virtual

Set the decimals flag.

By default, blank characters are stripped, and then the label is correctly aligned. The dot, if last character of the string, is also stripped, unless this option is specified. One can disable the option by calling axis.SetDecimals(kTRUE). Note the bit is set in fBits (as opposed to fBits2 in TAxis!)

Definition at line 2493 of file TGaxis.cxx.

◆ SetExponentOffset()

 void TGaxis::SetExponentOffset ( Float_t xoff = 0., Float_t yoff = 0., Option_t * axis = "xy" )
static

Static function to set X and Y offset of the axis 10^n notation.

It is in % of the pad size. It can be negative. axis specifies which axis ("x","y"), default = "x" if axis="xz" set the two axes

Definition at line 2781 of file TGaxis.cxx.

◆ SetFunction()

 void TGaxis::SetFunction ( const char * funcname = "" )

Specify a function to map the axis values.

Definition at line 2502 of file TGaxis.cxx.

◆ SetGridLength()

 void TGaxis::SetGridLength ( Float_t gridlength )
inline

Definition at line 121 of file TGaxis.h.

◆ SetLabelColor()

 void TGaxis::SetLabelColor ( Int_t labelcolor )
inline

Definition at line 105 of file TGaxis.h.

◆ SetLabelFont()

 void TGaxis::SetLabelFont ( Int_t labelfont )
inline

Definition at line 106 of file TGaxis.h.

◆ SetLabelOffset()

 void TGaxis::SetLabelOffset ( Float_t labeloffset )
inline

Definition at line 107 of file TGaxis.h.

◆ SetLabelSize()

 void TGaxis::SetLabelSize ( Float_t labelsize )
inline

Definition at line 108 of file TGaxis.h.

◆ SetMaxDigits()

 void TGaxis::SetMaxDigits ( Int_t maxd = 5 )
static

Static function to set fgMaxDigits for axis.

fgMaxDigits is the maximum number of digits permitted for the axis labels above which the notation with 10^N is used.For example, to accept 6 digits number like 900000 on an axis call TGaxis::SetMaxDigits(6). The default value is 5. fgMaxDigits must be greater than 0.

Definition at line 2643 of file TGaxis.cxx.

◆ SetMoreLogLabels()

 void TGaxis::SetMoreLogLabels ( Bool_t more = kTRUE )
virtual

Set the kMoreLogLabels bit flag.

When this option is selected more labels are drawn when in logarithmic scale and there is a small number of decades (less than 3). Note that this option is automatically inherited from TAxis

Definition at line 2662 of file TGaxis.cxx.

◆ SetName()

 void TGaxis::SetName ( const char * name )
virtual

Change the name of the axis.

Definition at line 2652 of file TGaxis.cxx.

◆ SetNdivisions()

 virtual void TGaxis::SetNdivisions ( Int_t ndiv )
inlinevirtual

Definition at line 115 of file TGaxis.h.

◆ SetNoExponent()

 void TGaxis::SetNoExponent ( Bool_t noExponent = kTRUE )
virtual

Set the NoExponent flag.

By default, an exponent of the form 10^N is used when the label values are either all very small or very large. One can disable the exponent by calling axis.SetNoExponent(kTRUE).

Definition at line 2673 of file TGaxis.cxx.

◆ SetOption()

 void TGaxis::SetOption ( Option_t * option = "" )

To set axis options.

Definition at line 2682 of file TGaxis.cxx.

◆ SetTickLength()

 void TGaxis::SetTickLength ( Float_t ticklength )
inline

Definition at line 120 of file TGaxis.h.

◆ SetTickSize()

 void TGaxis::SetTickSize ( Float_t ticksize )
inline

Definition at line 119 of file TGaxis.h.

◆ SetTimeFormat()

 void TGaxis::SetTimeFormat ( const char * tformat )

Change the format used for time plotting.

The format string for date and time use the same options as the one used in the standard strftime C function, i.e. :

for date :

• a abbreviated weekday name
• b abbreviated month name
• d day of the month (01-31)
• m month (01-12)
• y year without century

for time :

• H hour (24-hour clock)
• I hour (12-hour clock)
• p local equivalent of AM or PM
• M minute (00-59)
• S seconds (00-61)
• %% %

Definition at line 2717 of file TGaxis.cxx.

◆ SetTimeOffset()

 void TGaxis::SetTimeOffset ( Double_t toffset, Option_t * option = "local" )

Change the time offset. If option = "gmt", set display mode to GMT.

Definition at line 2741 of file TGaxis.cxx.

◆ SetTitle()

 void TGaxis::SetTitle ( const char * title = "" )
virtual

Change the title of the axis.

Definition at line 2690 of file TGaxis.cxx.

◆ SetTitleColor()

 void TGaxis::SetTitleColor ( Int_t titlecolor )
inline

Definition at line 128 of file TGaxis.h.

◆ SetTitleFont()

 void TGaxis::SetTitleFont ( Int_t titlefont )
inline

Definition at line 127 of file TGaxis.h.

◆ SetTitleOffset()

 void TGaxis::SetTitleOffset ( Float_t titleoffset = 1` )
inline

Definition at line 125 of file TGaxis.h.

◆ SetTitleSize()

 void TGaxis::SetTitleSize ( Float_t titlesize )
inline

Definition at line 126 of file TGaxis.h.

◆ SetWmax()

 void TGaxis::SetWmax ( Double_t wmax )
inline

Definition at line 130 of file TGaxis.h.

◆ SetWmin()

 void TGaxis::SetWmin ( Double_t wmin )
inline

Definition at line 129 of file TGaxis.h.

◆ fAxis

 TAxis* TGaxis::fAxis
protected

! Pointer to original TAxis axis (if any)

Definition at line 46 of file TGaxis.h.

◆ fChopt

 TString TGaxis::fChopt
protected

Axis options.

Definition at line 40 of file TGaxis.h.

◆ fFunction

 TF1* TGaxis::fFunction
protected

! Pointer to function computing axis values

Definition at line 45 of file TGaxis.h.

◆ fFunctionName

 TString TGaxis::fFunctionName
protected

Name of mapping function pointed by fFunction.

Definition at line 44 of file TGaxis.h.

◆ fgMaxDigits

 Int_t TGaxis::fgMaxDigits = 5
staticprotected

! Number of digits above which the 10>N notation is used

Definition at line 49 of file TGaxis.h.

◆ fGridLength

 Float_t TGaxis::fGridLength
protected

Length of the grid in NDC.

Definition at line 30 of file TGaxis.h.

◆ fLabelColor

 Int_t TGaxis::fLabelColor
protected

Color for labels.

Definition at line 37 of file TGaxis.h.

◆ fLabelFont

 Int_t TGaxis::fLabelFont
protected

Font for labels.

Definition at line 38 of file TGaxis.h.

◆ fLabelOffset

 Float_t TGaxis::fLabelOffset
protected

Offset of label wrt axis.

Definition at line 32 of file TGaxis.h.

◆ fLabelSize

 Float_t TGaxis::fLabelSize
protected

Size of labels in NDC.

Definition at line 33 of file TGaxis.h.

◆ fModLabs

 TList* TGaxis::fModLabs
protected

List of modified labels.

Definition at line 47 of file TGaxis.h.

◆ fName

 TString TGaxis::fName
protected

Axis name.

Definition at line 41 of file TGaxis.h.

◆ fNdiv

 Int_t TGaxis::fNdiv
protected

Number of divisions.

Definition at line 36 of file TGaxis.h.

◆ fNModLabs

 Int_t TGaxis::fNModLabs
protected

Number of modified labels.

Definition at line 39 of file TGaxis.h.

◆ fTickSize

 Float_t TGaxis::fTickSize
protected

Size of primary tick mark in NDC.

Definition at line 31 of file TGaxis.h.

◆ fTimeFormat

 TString TGaxis::fTimeFormat
protected

Time format, ex: 09/12/99 12:34:00.

Definition at line 43 of file TGaxis.h.

◆ fTitle

 TString TGaxis::fTitle
protected

Axis title.

Definition at line 42 of file TGaxis.h.

◆ fTitleOffset

 Float_t TGaxis::fTitleOffset
protected

Offset of title wrt axis.

Definition at line 34 of file TGaxis.h.

◆ fTitleSize

 Float_t TGaxis::fTitleSize
protected

Size of title in NDC.

Definition at line 35 of file TGaxis.h.

◆ fWmax

 Double_t TGaxis::fWmax
protected

Highest value on the axis.

Definition at line 29 of file TGaxis.h.

◆ fWmin

 Double_t TGaxis::fWmin
protected

Lowest value on the axis.

Definition at line 28 of file TGaxis.h.

◆ fXAxisExpXOffset

 Float_t TGaxis::fXAxisExpXOffset = 0.
staticprotected

! Exponent X offset for the X axis

Definition at line 50 of file TGaxis.h.

◆ fXAxisExpYOffset

 Float_t TGaxis::fXAxisExpYOffset = 0.
staticprotected

! Exponent Y offset for the X axis

Definition at line 51 of file TGaxis.h.

◆ fYAxisExpXOffset

 Float_t TGaxis::fYAxisExpXOffset = 0.
staticprotected

! Exponent X offset for the Y axis

Definition at line 52 of file TGaxis.h.

◆ fYAxisExpYOffset

 Float_t TGaxis::fYAxisExpYOffset = 0.
staticprotected

! Exponent Y offset for the Y axis

Definition at line 53 of file TGaxis.h.

Libraries for TGaxis:
[legend]

The documentation for this class was generated from the following files: