Logo ROOT  
Reference Guide
canvas2.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example of canvas partitioning.

Sometimes the Divide() method is not appropriate to divide a Canvas. Because of the left and right margins, all the pads do not have the same width and height. CanvasPartition does that properly. This example also ensure that the axis labels and titles have the same sizes and that the tick marks length is uniform.

void CanvasPartition(TCanvas *C,const Int_t Nx = 2,const Int_t Ny = 2,
Float_t lMargin = 0.15, Float_t rMargin = 0.05,
Float_t bMargin = 0.15, Float_t tMargin = 0.05);
void canvas2()
{
TCanvas *C = (TCanvas*) gROOT->FindObject("C");
if (C) delete C;
C = new TCanvas("C","canvas",1024,640);
C->SetFillStyle(4000);
// Number of PADS
const Int_t Nx = 5;
const Int_t Ny = 5;
// Margins
Float_t lMargin = 0.12;
Float_t rMargin = 0.05;
Float_t bMargin = 0.15;
Float_t tMargin = 0.05;
// Canvas setup
CanvasPartition(C,Nx,Ny,lMargin,rMargin,bMargin,tMargin);
// Dummy histogram.
TH1F *h = (TH1F*) gROOT->FindObject("histo");
if (h) delete h;
h = new TH1F("histo","",100,-5.0,5.0);
h->FillRandom("gaus",10000);
h->GetXaxis()->SetTitle("x axis");
h->GetYaxis()->SetTitle("y axis");
TPad *pad[Nx][Ny];
for (Int_t i=0;i<Nx;i++) {
for (Int_t j=0;j<Ny;j++) {
C->cd(0);
// Get the pads previously created.
char pname[16];
sprintf(pname,"pad_%i_%i",i,j);
pad[i][j] = (TPad*) gROOT->FindObject(pname);
pad[i][j]->Draw();
pad[i][j]->SetFillStyle(4000);
pad[i][j]->SetFrameFillStyle(4000);
pad[i][j]->cd();
// Size factors
Float_t xFactor = pad[0][0]->GetAbsWNDC()/pad[i][j]->GetAbsWNDC();
Float_t yFactor = pad[0][0]->GetAbsHNDC()/pad[i][j]->GetAbsHNDC();
char hname[16];
sprintf(hname,"h_%i_%i",i,j);
TH1F *hFrame = (TH1F*) h->Clone(hname);
hFrame->Reset();
hFrame->Draw();
// y axis range
hFrame->GetYaxis()->SetRangeUser(0.0001,1.2*h->GetMaximum());
// Format for y axis
hFrame->GetYaxis()->SetLabelFont(43);
hFrame->GetYaxis()->SetLabelSize(16);
hFrame->GetYaxis()->SetLabelOffset(0.02);
hFrame->GetYaxis()->SetTitleFont(43);
hFrame->GetYaxis()->SetTitleSize(16);
hFrame->GetYaxis()->SetTitleOffset(2);
hFrame->GetYaxis()->CenterTitle();
hFrame->GetYaxis()->SetNdivisions(505);
// TICKS Y Axis
hFrame->GetYaxis()->SetTickLength(xFactor*0.04/yFactor);
// Format for x axis
hFrame->GetXaxis()->SetLabelFont(43);
hFrame->GetXaxis()->SetLabelSize(16);
hFrame->GetXaxis()->SetLabelOffset(0.02);
hFrame->GetXaxis()->SetTitleFont(43);
hFrame->GetXaxis()->SetTitleSize(16);
hFrame->GetXaxis()->SetTitleOffset(1);
hFrame->GetXaxis()->CenterTitle();
hFrame->GetXaxis()->SetNdivisions(505);
// TICKS X Axis
hFrame->GetXaxis()->SetTickLength(yFactor*0.06/xFactor);
h->Draw("same");
}
}
C->cd();
}
void CanvasPartition(TCanvas *C,const Int_t Nx,const Int_t Ny,
Float_t lMargin, Float_t rMargin,
Float_t bMargin, Float_t tMargin)
{
if (!C) return;
// Setup Pad layout:
Float_t vSpacing = 0.0;
Float_t vStep = (1.- bMargin - tMargin - (Ny-1) * vSpacing) / Ny;
Float_t hSpacing = 0.0;
Float_t hStep = (1.- lMargin - rMargin - (Nx-1) * hSpacing) / Nx;
Float_t vposd,vposu,vmard,vmaru,vfactor;
Float_t hposl,hposr,hmarl,hmarr,hfactor;
for (Int_t i=0;i<Nx;i++) {
if (i==0) {
hposl = 0.0;
hposr = lMargin + hStep;
hfactor = hposr-hposl;
hmarl = lMargin / hfactor;
hmarr = 0.0;
} else if (i == Nx-1) {
hposl = hposr + hSpacing;
hposr = hposl + hStep + rMargin;
hfactor = hposr-hposl;
hmarl = 0.0;
hmarr = rMargin / (hposr-hposl);
} else {
hposl = hposr + hSpacing;
hposr = hposl + hStep;
hfactor = hposr-hposl;
hmarl = 0.0;
hmarr = 0.0;
}
for (Int_t j=0;j<Ny;j++) {
if (j==0) {
vposd = 0.0;
vposu = bMargin + vStep;
vfactor = vposu-vposd;
vmard = bMargin / vfactor;
vmaru = 0.0;
} else if (j == Ny-1) {
vposd = vposu + vSpacing;
vposu = vposd + vStep + tMargin;
vfactor = vposu-vposd;
vmard = 0.0;
vmaru = tMargin / (vposu-vposd);
} else {
vposd = vposu + vSpacing;
vposu = vposd + vStep;
vfactor = vposu-vposd;
vmard = 0.0;
vmaru = 0.0;
}
C->cd(0);
char name[16];
sprintf(name,"pad_%i_%i",i,j);
TPad *pad = (TPad*) gROOT->FindObject(name);
if (pad) delete pad;
pad = new TPad(name,"",hposl,vposd,hposr,vposu);
pad->SetLeftMargin(hmarl);
pad->SetRightMargin(hmarr);
pad->SetBottomMargin(vmard);
pad->SetTopMargin(vmaru);
pad->SetBorderMode(0);
pad->SetBorderSize(0);
pad->Draw();
}
}
}
#define h(i)
Definition: RSha256.hxx:106
int Int_t
Definition: RtypesCore.h:45
float Float_t
Definition: RtypesCore.h:57
char name[80]
Definition: TGX11.cxx:110
#define gROOT
Definition: TROOT.h:404
R__EXTERN TStyle * gStyle
Definition: TStyle.h:412
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition: TAttAxis.cxx:302
virtual void SetLabelSize(Float_t size=0.04)
Set size of axis labels.
Definition: TAttAxis.cxx:205
virtual void SetTitleFont(Style_t font=62)
Set the title font.
Definition: TAttAxis.cxx:330
virtual void SetLabelOffset(Float_t offset=0.005)
Set distance between the axis and the labels.
Definition: TAttAxis.cxx:194
virtual void SetLabelFont(Style_t font=62)
Set labels' font.
Definition: TAttAxis.cxx:183
virtual void SetTitleSize(Float_t size=0.04)
Set size of axis title.
Definition: TAttAxis.cxx:312
virtual void SetTickLength(Float_t length=0.03)
Set tick mark length.
Definition: TAttAxis.cxx:288
virtual void SetNdivisions(Int_t n=510, Bool_t optim=kTRUE)
Set the number of divisions for this axis.
Definition: TAttAxis.cxx:237
virtual void SetBottomMargin(Float_t bottommargin)
Set Pad bottom margin in fraction of the pad height.
Definition: TAttPad.cxx:99
virtual void SetLeftMargin(Float_t leftmargin)
Set Pad left margin in fraction of the pad width.
Definition: TAttPad.cxx:109
void SetFrameBorderMode(Int_t mode=1)
Definition: TAttPad.h:79
void SetFrameFillStyle(Style_t styl=0)
Definition: TAttPad.h:75
virtual void SetRightMargin(Float_t rightmargin)
Set Pad right margin in fraction of the pad width.
Definition: TAttPad.cxx:119
virtual void SetTopMargin(Float_t topmargin)
Set Pad top margin in fraction of the pad height.
Definition: TAttPad.cxx:129
void CenterTitle(Bool_t center=kTRUE)
Center axis title.
Definition: TAxis.h:184
virtual void SetRangeUser(Double_t ufirst, Double_t ulast)
Set the viewing range for the axis from ufirst to ulast (in user coordinates, that is,...
Definition: TAxis.cxx:946
The Canvas class.
Definition: TCanvas.h:23
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:575
virtual void Reset(Option_t *option="")
Reset.
Definition: TH1.cxx:9954
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:320
TAxis * GetYaxis()
Definition: TH1.h:321
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:3074
The most important graphics class in the ROOT system.
Definition: TPad.h:26
void SetBorderSize(Short_t bordersize) override
Definition: TPad.h:318
void SetFillStyle(Style_t fstyle) override
Override TAttFill::FillStyle for TPad because we want to handle style=0 as style 4000.
Definition: TPad.cxx:5921
Double_t GetAbsWNDC() const override
Definition: TPad.h:216
TVirtualPad * cd(Int_t subpadnumber=0) override
Set Current pad.
Definition: TPad.cxx:604
void Draw(Option_t *option="") override
Draw Pad in Current pad (re-parent pad if necessary).
Definition: TPad.cxx:1300
void SetBorderMode(Short_t bordermode) override
Definition: TPad.h:317
Double_t GetAbsHNDC() const override
Definition: TPad.h:217
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition: TStyle.cxx:1589
static double C[]
Author
Olivier Couet

Definition in file canvas2.C.