Plots With Filled Areas

ROOT
1

Greetings all. I’m trying to make a plot where there is a filled area between two curves. I have defined TF1 objects for the upper and lower edges of the filled areas, and would like to just have a solid color displayed between them. I have something of a work-around for this. I just plot the upper and lower edges on a canvas, then dump the output to a png file, and fill in the appropriate regions with an external image editor. I just keep thinking that there has to be a better way to do this. Any suggestions?

Thanks!

Vic

2

see an example in the macro below

Rene

[code]void grshade() {
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+i0.1;
ymax[i] = 10sin(x[i]+0.2);
ymin[i] = 8sin(x[i]+0.1);
y[i] = 9sin(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(2n);
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”);
}
[/code]

3

Thanks! That was perfect!