swh:1:snp:af87cd67498ef4fe47c76ed3e7caffe5b61facaf
Tip revision: 59fe6578eda8d4c55e125a80e956ef4431ab5322 authored by Pere Mato on 04 March 2016, 14:47:28 UTC
Update ROOT version files to v6.07/04.
Update ROOT version files to v6.07/04.
Tip revision: 59fe657
reverseaxis.C
/// \file
/// \ingroup tutorial_hist
/// Example showing an histogram with reverse axis.
///
/// \macro_image
/// \macro_code
///
/// \author Olivier Couet
void ReverseXAxis (TH1 *h);
void ReverseYAxis (TH1 *h);
void reverseaxis ()
{
TH2F *hpxpy = new TH2F("hpxpy","py vs px",40,-4,4,40,-4,4);
Float_t px, py;
TRandom r;
for (Int_t i = 0; i < 25000; i++) {
r.Rannor(px,py);
hpxpy->Fill(px,py);
}
TCanvas *c1 = new TCanvas("c1");
hpxpy->Draw("colz");
ReverseXAxis(hpxpy);
ReverseYAxis(hpxpy);
}
void ReverseXAxis (TH1 *h)
{
// 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();
}
void ReverseYAxis (TH1 *h)
{
// 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();
}