[ROOT] Redrawing a closed canvas

From: Chris Milne (phycm@phy.hw.ac.uk)
Date: Mon Aug 13 2001 - 14:30:17 MEST 

Hi there,

I have a button on screen which, when clicked, displays a canvas with four 
graphs. However, if I close the canvas and click the button again I get:

 *** Break *** bus error
Root > Function display_blue_blea() busy flag cleared

The function called by the button is below:

void display_blue_blea() {
   TCanvas *blue_blea;
   if(blue_blea) delete blue_blea;
   blue_blea = new TCanvas ("blue_blea", "Blueshift and   
Bleaching",20,20,710,710);  
   blue_blea->Divide(2,2);
   blue_blea->cd(1);							
   pad2->Draw();	
   blue_blea->cd(2);							
   pad3->Draw();	
   blue_blea->cd(3);						
   pad4->Draw();	
   blue_blea->cd(4);							
   pad5->Draw();	
   blue_blea->cd(1);							
   TSlider *xslider = new TSlider("xslider","x",0.1,0.02,0.9,0.1);
   xslider->AddExec("fit",".x fit.C");				//run on mouse 
over pad
   blue_blea->cd(2);	
   TSlider *xslider2 = new TSlider("xslider2","x",0.1,0.02,0.9,0.1);
   xslider2->AddExec("fit",".x fit.C");			//run on mouse over pad
   blue_blea->cd(3);	
   TSlider *xslider3 = new TSlider("xslider3","x",0.1,0.02,0.9,0.1);
   xslider3->AddExec("fit",".x fit.C");
   blue_blea->cd(4);	
   TSlider *xslider4 = new TSlider("xslider4","x",0.1,0.02,0.9,0.1);
   xslider4->AddExec("fit",".x fit.C");
     pad2->cd();
  TH2F * bleaaxisHH= new TH2F("bleaaxisHH","Bleaching Heavy 
Hole",y,time[0],time[y-1],x,HH_bleach_min,HH_bleach_max);
  bleaaxisHH->SetStats(kFALSE);
  bleaaxisHH->GetYaxis()->SetLimits(0,HH_bleach_max);
  bleaaxisHH->Draw("A");
  bleaaxisHH->GetYaxis()->SetTitleOffset(1.2);
  Bleach_HH_SCP->Draw("P");
  Bleach_HH_SCP->SetMarkerColor(kBlue);
  Bleach_HH_SCP->SetMarkerStyle(8);
  Bleach_HH_SCP->SetMarkerSize(0.5);
  Bleach_HH_SCP->SetLineColor(kBlue);
  Bleach_HH_OCP->Draw("P");
  Bleach_HH_OCP->SetMarkerColor(kGreen);
  Bleach_HH_OCP->SetMarkerStyle(8);
  Bleach_HH_OCP->SetMarkerSize(0.5);
  Bleach_HH_OCP->SetLineColor(kGreen);
  
  pad3->cd();
  TH2F * bleaaxisLH= new TH2F("bleaaxisLH","Bleaching Light 
Hole",y,time[0],time[y-1],x,LH_bleach_min,LH_bleach_max);
  bleaaxisLH->SetStats(kFALSE);
  bleaaxisLH->Draw("A");
  pad3->Update();
  bleaaxisLH->GetYaxis()->SetTitleOffset(1.2);
  Bleach_LH_SCP->Draw("P");
  Bleach_LH_SCP->SetMarkerColor(kBlue);
  Bleach_LH_SCP->SetMarkerStyle(8);
  Bleach_LH_SCP->SetMarkerSize(0.5);
  Bleach_LH_SCP->SetLineColor(kBlue);
  Bleach_LH_OCP->Draw("P");
  Bleach_LH_OCP->SetMarkerColor(kGreen);
  Bleach_LH_OCP->SetMarkerStyle(8);
  Bleach_LH_OCP->SetMarkerSize(0.5);
  Bleach_LH_OCP->SetLineColor(kGreen);
  
  pad4->cd();
  TH2F * blueaxisHH= new TH2F("blueaxisHH","Blueshift Heavy 
Hole",y,time[0],time[y-1],x,HH_blueshift_min,HH_blueshift_max);
  blueaxisHH->SetStats(kFALSE);
  blueaxisHH->Draw("A");
  blueaxisHH->GetYaxis()->SetTitleOffset(1.2);
  Blueshift_HH_SCP->Draw("P");
  Blueshift_HH_SCP->SetMarkerColor(kBlue);
  Blueshift_HH_SCP->SetMarkerStyle(8);
  Blueshift_HH_SCP->SetMarkerSize(0.5);
  Blueshift_HH_SCP->SetLineColor(kBlue);
  Blueshift_HH_OCP->Draw("P");
  Blueshift_HH_OCP->SetMarkerColor(kGreen);
  Blueshift_HH_OCP->SetMarkerStyle(8);
  Blueshift_HH_OCP->SetMarkerSize(0.5);
  Blueshift_HH_OCP->SetLineColor(kGreen);
   
  pad5->cd();
  TH2F * blueaxisLH= new TH2F("blueaxisLH","Blueshift Light 
Hole",y,time[0],time[y-1],x,LH_blueshift_min,LH_blueshift_max);
  blueaxisLH->SetStats(kFALSE);
  blueaxisLH->GetYaxis()->SetLimits(0,LH_blueshift_max); 
  blueaxisLH->Draw("A");
  blueaxisLH->GetYaxis()->SetTitleOffset(1.2); 
  Blueshift_LH_SCP->Draw("P");
  Blueshift_LH_SCP->SetMarkerColor(kBlue);
  Blueshift_LH_SCP->SetMarkerStyle(8);
  Blueshift_LH_SCP->SetMarkerSize(0.5);
  Blueshift_LH_SCP->SetLineColor(kBlue);
  Blueshift_LH_OCP->Draw("P");
  Blueshift_LH_OCP->SetMarkerColor(kGreen);
  Blueshift_LH_OCP->SetMarkerStyle(8);
  Blueshift_LH_OCP->SetMarkerSize(0.5);
  Blueshift_LH_OCP->SetLineColor(kGreen);
  
  bleaaxisLH->GetYaxis()->SetTitle("Bleaching (a.u.)");
  bleaaxisHH->GetYaxis()->SetTitle("Bleaching (a.u.)");
  blueaxisLH->GetYaxis()->SetTitle("Blueshift (meV)");
  blueaxisHH->GetYaxis()->SetTitle("Blueshift (meV)");
  bleaaxisLH->GetXaxis()->SetTitle("Time (ps)");
  bleaaxisHH->GetXaxis()->SetTitle("Time (ps)");
  blueaxisLH->GetXaxis()->SetTitle("Time (ps)");
  blueaxisHH->GetXaxis()->SetTitle("Time (ps)");
  pad2->cd();
  TPaveText *legend = new TPaveText(.82,.82,.97,.97,"NDC");
  TText *OCP = new TText(0.85,0.85,"OCP");
  TText *SCP = new TText(0.85,0.9,"SCP");
  legend->Draw();
  OCP->SetTextColor(kGreen);
  SCP->SetTextColor(kBlue);
  SCP->DrawTextNDC(0.85,0.84,"OCP"); 
  OCP->DrawTextNDC(0.85,0.91,"SCP");
  blue_blea->cd(2);
  legend->Draw();
  SCP->DrawTextNDC(0.85,0.84,"OCP"); 
  OCP->DrawTextNDC(0.85,0.91,"SCP");
  blue_blea->cd(3);
  legend->Draw();
  SCP->DrawTextNDC(0.85,0.84,"OCP"); 
  OCP->DrawTextNDC(0.85,0.91,"SCP");
  blue_blea->cd(4);
  legend->Draw();
  SCP->DrawTextNDC(0.85,0.84,"OCP"); 
  OCP->DrawTextNDC(0.85,0.91,"SCP");
}

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