graphShade

Show how to shade an area between two graphs

Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, November 29, 2022 at 11:17 AM.

In [1]:
TCanvas *c1 = new TCanvas("c1",
   "A Simple Graph Example",200,10,700,500);

c1->SetGrid();
c1->DrawFrame(0,0,2.2,12);

const Int_t n = 20;
Double_t x[n], y[n],ymin[n], ymax[n];
Int_t i;
for (i=0;i<n;i++) {
  x[i] = 0.1+i*0.1;
  ymax[i] = 10*sin(x[i]+0.2);
  ymin[i] = 8*sin(x[i]+0.1);
  y[i] = 9*sin(x[i]+0.15);
}
TGraph *grmin = new TGraph(n,x,ymin);
TGraph *grmax = new TGraph(n,x,ymax);
TGraph *gr    = new TGraph(n,x,y);
TGraph *grshade = new TGraph(2*n);
for (i=0;i<n;i++) {
   grshade->SetPoint(i,x[i],ymax[i]);
   grshade->SetPoint(n+i,x[n-i-1],ymin[n-i-1]);
}
grshade->SetFillStyle(3013);
grshade->SetFillColor(16);
grshade->Draw("f");
grmin->Draw("l");
grmax->Draw("l");
gr->SetLineWidth(4);
gr->SetMarkerColor(4);
gr->SetMarkerStyle(21);
gr->Draw("CP");

Draw all canvases

In [2]:
gROOT->GetListOfCanvases()->Draw()