Hi Giada,
See an example in the script grshade.C in the attachment
Rene Brun
Giada Valle wrote:
>
> Hi, Rooters!
>
> I'm using root v.3.00/05 16 February 2001
> on a Redhat Linux 6.2.
> I'm trying to fill a region between two curves (TGraph objects), but
> I'm not able to get the correct filling. I'm trying to use the
> function Draw with the "F" option, after setting an appropriate
> FillColor, but the program fill a "random" region, depending
> on the curves I plot after it!
>
> Can anyone help me? Thanks in advance!
>
> Giada Valle
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+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");
}
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:51 MET