#include <TH1F.h>
#include <TCanvas.h>
#include <TImage.h>
#include <TApplication.h>
#include <TROOT.h>

#include <iostream> 

/*

To compile : 
g++ -g -I/opt/root/include -pthread -m64 -fPIC -W -Wall -Wextra -Wconversion -Wdisabled-optimization -Wno-unused -Wall -Wshadow -Wextra -Wredundant-decls -L/opt/root/lib -lGpad -lHist -lGraf -lGraf3d -lTree -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lRIO -lNet -lThread -lCore -lCint -lm -ldl ex_drawclonepad.cpp -o ex_drawclonepad

To run : 
./ex_drawclonepad

To valgrind : 
valgrind --suppressions=$ROOTSYS/etc/valgrind-root.supp --log-file=valgrind-drawclonepaddelete.output  --leak-check=full --tool=memcheck --show-reachable=no --num-callers=35 ./ex_drawclonepad


*/

int main(int argc, char *argv[]) {

  TApplication myApp("App", &argc, &argv);
  gROOT->SetBatch();

  // create a tcanvas with pads, draw a h1 in a pad
  std::cout << "create first canvas" << std::endl;
  TCanvas *c1 = new TCanvas("test1", "test1", 0, 0, 600, 300);
  TH1F h1("h1", "h1", 100, 0, 99);
  //c1->cd();
  h1.Draw();
  c1->SaveAs("test.ps"); // ok
  
  // Create a summary canvas
  std::cout << "create summary canvas" << std::endl;
  TCanvas* summary = new TCanvas("summary");
  
  // 3 attempts to draw the initial canvas onto the second one. 
  // Uncomment only one at a time
  summary->cd();
  //c1->Draw(); 
  //summary->SaveAs("test2.ps"); // empty
  //c1->DrawClone(); 
  //summary->SaveAs("test3.ps"); // empty
  TObject *o = c1->DrawClonePad();
  summary->SaveAs("test4.ps"); // ok but memory leak

  // Deletion
  std::cout << "clean up" << std::endl;
  delete o;
  delete summary;
  delete c1;
  
}