Drawing a TGraph and a TF1 in the same plot

[acgc99]

Hi,
I want to plot two TF1 and one TGraph at the same plot, but when I add one TF1 the TGraph disappears:

void draw_bounds(){
	
	gStyle->SetCanvasPreferGL(true);
	
	TCanvas* c1 = new TCanvas("C","canvas",1920/2,1080/2);
	c1->SetGrid();
	
	TF1* func1 = new TF1("ctzi", "100-0.01*x+8.89*pow(x,2)", -3,3);
	TF1* func2 = new TF1("ctwi", "100+0.02*x+11.6*pow(x,2)", -3,3);
	
	func1->GetXaxis()->SetTitle("WC");
	func1->SetTitle("");
	func1->GetYaxis()->SetTitle("#sigma/#sigma_{SM} (%)");
	
	func1->SetLineColor(kRed);
	func2->SetLineColor(kBlue);
	
	func1->SetLineWidth(2);
	func2->SetLineWidth(2);
	
	TLegend* legend = new TLegend(0.1, 0.75, 0.2, 0.9);
	legend->AddEntry(func1, "ctzi","l");
	legend->AddEntry(func2, "ctwi","l");
	
	TGraph *grshade = new TGraph();
	int n = 1000;
	double x[n];
	for (int i=0;i<n;i++) {
		x[i] = -3.0+3.0*2.0*i/n;
    }
	for(int i=0;i<n;i++){
		grshade->SetPoint(i,x[i],110);
		grshade->SetPoint(n+i,x[n-i-1],90);
	}
	grshade->SetFillColorAlpha(kRed, 0.5);
	
	
	grshade->Draw("af");
	func1->Draw();
	//func2->Draw("SAME");
	//legend->Draw();
	
}

---

ROOT Version: 6.24/06
Platform: Windows Subsystem for Linux (Debian)
Compiler: Not Provided

---

[couet]

void draw_bounds(){

   gStyle->SetCanvasPreferGL(true);

   TCanvas* c1 = new TCanvas("C","canvas",1920/2,1080/2);
   c1->SetGrid();

   TF1* func1 = new TF1("ctzi", "100-0.01*x+8.89*pow(x,2)", -3,3);
   TF1* func2 = new TF1("ctwi", "100+0.02*x+11.6*pow(x,2)", -3,3);

   func1->GetXaxis()->SetTitle("WC");
   func1->SetTitle("");
   func1->GetYaxis()->SetTitle("#sigma/#sigma_{SM} (%)");

   func1->SetLineColor(kRed);
   func2->SetLineColor(kBlue);

   func1->SetLineWidth(2);
   func2->SetLineWidth(2);

   TLegend* legend = new TLegend(0.1, 0.75, 0.2, 0.9);
   legend->AddEntry(func1, "ctzi","l");
   legend->AddEntry(func2, "ctwi","l");

   TGraph *grshade = new TGraph();
   int n = 1000;
   double x[n];
   for (int i=0;i<n;i++) {
      x[i] = -3.0+3.0*2.0*i/n;
    }
   for(int i=0;i<n;i++){
      grshade->SetPoint(i,x[i],110);
      grshade->SetPoint(n+i,x[n-i-1],90);
   }
   grshade->SetFillColorAlpha(kRed, 0.5);


   grshade->Draw("af");
   func1->Draw("same");
   func2->Draw("SAME");
   legend->Draw();

}