/// \file /// \ingroup tutorial_hist /// Echo object at mouse position. /// Example of macro called when a pad is redrawn /// one must create a TExec object in the following way /// ~~~{.cpp} /// TExec ex("ex",".x exec1.C"); /// ex.Draw(); /// ~~~ /// this macro prints the bin number and the bin content when one clicks /// on the histogram contour of any histogram in a pad /// /// \macro_code /// /// \author Rene Brun void exec1() { if (!gPad) { Error("exec1", "gPad is null, you are not supposed to run this macro"); return; } int event = gPad->GetEvent(); if (event != 11) return; int px = gPad->GetEventX(); TObject *select = gPad->GetSelected(); if (!select) return; if (select->InheritsFrom(TH1::Class())) { TH1 *h = (TH1*)select; Float_t xx = gPad->AbsPixeltoX(px); Float_t x = gPad->PadtoX(xx); Int_t binx = h->GetXaxis()->FindBin(x); printf("event=%d, hist:%s, bin=%d, content=%f\n",event,h->GetName(),binx,h->GetBinContent(binx)); } }