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To build a polar graph in a square Canvas

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void polar()
{
TCanvas* c = new TCanvas("myCanvas","myCanvas",600,600);
double rmin=0;
double rmax=TMath::Pi()*6;
const int npoints=1000;
Double_t r[npoints];
Double_t theta[npoints];
for (Int_t ipt = 0; ipt < npoints; ipt++)
 {
r[ipt] = ipt*(rmax-rmin)/npoints+rmin;
theta[ipt] = TMath::Sin(r[ipt]);
}
TGraphPolar grP1 (npoints,r,theta);
grP1.SetTitle("A Fan");
grP1.SetLineWidth(3);
grP1.SetLineColor(2);
grP1.DrawClone("AOL");
}

The graph of a fan obtained with ROOT :
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