void MGImage::DrawCircle ( UChar_t *  buf, int  w, int  h, Float_t  x, Float_t  y, Float_t  r, UChar_t  col  )

static

Definition at line 350 of file MGImage.cc.

References i.

Referenced by DisableSyncMode(), and FilterLed::DrawCircle().

{
    const Int_t n = TMath::Nint(sqrt(2.)*r*TMath::Pi()/2);
    for (int i=0; i<n-1; i++)
    {
        const Double_t angle = TMath::TwoPi()*i/n;

        const Double_t dx = r*cos(angle);
        const Double_t dy = r*sin(angle);

        const Int_t x1 = TMath::Nint(x+dx);
        const Int_t x2 = TMath::Nint(x-dx);

        const Int_t y1 = TMath::Nint(y+dy);
        if (y1>=0 && y1<h)
        {
            if (x1>=0 && x1<w)
                buf[x1+y1*w] = col;

            if (x2>=0 && x2<w)
                buf[x2+y1*w] = col;
        }

        const Int_t y2 = TMath::Nint(y-dy);
        if (y2>=0 && y2<h)
        {
            if (x1>=0 && x1<w)
                buf[x1+y2*w] = col;

            if (x2>=0 && x2<w)
                buf[x2+y2*w] = col;
        }
    }
}

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