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hist021_TH2_reverse_axis.C File Reference

Detailed Description

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Example showing an histogram with reverse axis.

{
TH2F *hpxpy = new TH2F("hpxpy", "py vs px", 40, -4, 4, 40, -4, 4);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
r.Rannor(px, py);
hpxpy->Fill(px, py);
}
TCanvas *c1 = new TCanvas("c1");
hpxpy->Draw("colz");
}
{
// Remove the current axis
h->GetXaxis()->SetLabelOffset(999);
h->GetXaxis()->SetTickLength(0);
// Redraw the new axis
gPad->Update();
TGaxis *newaxis = new TGaxis(gPad->GetUxmax(), gPad->GetUymin(), gPad->GetUxmin(), gPad->GetUymin(),
h->GetXaxis()->GetXmin(), h->GetXaxis()->GetXmax(), 510, "-");
newaxis->SetLabelOffset(-0.03);
newaxis->Draw();
}
{
// Remove the current axis
h->GetYaxis()->SetLabelOffset(999);
h->GetYaxis()->SetTickLength(0);
// Redraw the new axis
gPad->Update();
TGaxis *newaxis = new TGaxis(gPad->GetUxmin(), gPad->GetUymax(), gPad->GetUxmin() - 0.001, gPad->GetUymin(),
h->GetYaxis()->GetXmin(), h->GetYaxis()->GetXmax(), 510, "+");
newaxis->SetLabelOffset(-0.03);
newaxis->Draw();
}
#define h(i)
Definition RSha256.hxx:106
int Int_t
Definition RtypesCore.h:45
float Float_t
Definition RtypesCore.h:57
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t r
#define gPad
The Canvas class.
Definition TCanvas.h:23
The axis painter class.
Definition TGaxis.h:26
TH1 is the base class of all histogram classes in ROOT.
Definition TH1.h:59
2-D histogram with a float per channel (see TH1 documentation)
Definition TH2.h:307
This is the base class for the ROOT Random number generators.
Definition TRandom.h:27
return c1
Definition legend1.C:41
Date
July 2016
Author
Olivier Couet

Definition in file hist021_TH2_reverse_axis.C.