Hi Joakim,
Use a TGraph instead of TPolyLine. See macro below:
Rene Brun
{
gROOT->Reset();
TCanvas *mycanvas = new TCanvas("mycanvas", "My
Canvas",400,10,800,800);
Int_t NPoints = 4;
Float_t X[4]; X[0]=0.35; X[1]=0.45; X[2]=0.55; X[3]=0.35;
Float_t Y[4]; Y[0]=0.4; Y[1]=0.6; Y[2]=0.4; Y[3]=0.4;
TGraph *plin = new TGraph(NPoints,X,Y);
plin->SetLineColor(3); //green
plin->SetLineWidth(2);
plin->SetFillColor(4); //blue
plin->Draw("af"); //draw with Axis and Fill
plin->Draw("l"); //draw only the contour Line
}
On Sun, 30 Jan 2000, Joakim Nystrand wrote:
>
> Hi,
>
> Can one create and fill a polygon in root? I have tried to use
> TPolyLine the following way but it doesn't seem to work:
>
> TCanvas *mycanvas = new TCanvas("mycanvas", "My Canvas",400,10,800,800);
> Int_t NPoints = 4;
> Float_t X[4]; X[0]=0.35; X[1]=0.45; X[2]=0.55; X[3]=0.35;
> Float_t Y[4]; Y[0]=0.4; Y[1]=0.6; Y[2]=0.4; Y[3]=0.4;
> TPolyLine *plin = new TPolyLine(NPoints,X,Y);
> plin->SetLineColor(3); //green
> plin->SetLineWidth(2);
> plin->SetFillColor(4); //blue
> plin->Draw();
>
> It seems that the SetFillColor(4) has no effect. Is this a bug, or is this
> functionality not there (can it be put in?), or am I doing something
> wrong. Grateful for help.
>
> Joakim Nystrand
>
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