img2pad.C

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/// \file
/// \ingroup tutorial_image
/// \notebook
/// Display image in canvas and pad.
///
/// \macro_image
/// \macro_code
///
/// \author Valeriy Onuchin
 
void img2pad()
{
   TString fname = gROOT->GetTutorialDir();
   fname.Append("/visualisation/image/rose512.jpg");
   TImage *img = TImage::Open(fname);
 
   if (!img) {
      printf("Could not create an image... exit\n");
      return;
   }
 
   img->SetConstRatio(kFALSE);
   img->Draw("N");
 
   TCanvas *c = (TCanvas *)gROOT->GetListOfCanvases()->FindObject("rose512jpg");
   c->SetFixedAspectRatio();
 
   TCanvas *c1 = new TCanvas("roses", "roses", 800, 800);
   img->Draw("T100,100,#ffff00");
   /*img->Draw("T100,100,#556655");*/
   /*img->Draw("T100,100");*/
 
   TImage *i1 = TImage::Open(fname);
   i1->SetConstRatio(kFALSE);
   i1->Flip(90);
   TImage *i2 = TImage::Open(fname);
   i2->SetConstRatio(kFALSE);
   i2->Flip(180);
   TImage *i3 = TImage::Open(fname);
   i3->SetConstRatio(kFALSE);
   i3->Flip(270);
   TImage *i4 = TImage::Open(fname);
   i4->SetConstRatio(kFALSE);
   i4->Mirror(kTRUE);
 
   float d = 0.40;
   TPad *p1 = new TPad("i1", "i1", 0.05, 0.55, 0.05 + d * i1->GetWidth() / i1->GetHeight(), 0.95);
   TPad *p2 = new TPad("i2", "i2", 0.55, 0.55, 0.95, 0.55 + d * i2->GetHeight() / i2->GetWidth());
   TPad *p3 = new TPad("i3", "i3", 0.55, 0.05, 0.55 + d * i3->GetWidth() / i3->GetHeight(), 0.45);
   TPad *p4 = new TPad("i4", "i4", 0.05, 0.05, 0.45, 0.05 + d * i4->GetHeight() / i4->GetWidth());
 
   p1->Draw();
   p1->cd();
   i1->Draw();
   c1->cd();
 
   p2->Draw();
   p2->cd();
   i2->Draw();
   c1->cd();
 
   p3->Draw();
   p3->cd();
   i3->Draw();
   c1->cd();
 
   p4->Draw();
   p4->cd();
   i4->Draw();
   c1->cd();
}