CairoSamples.Form1.arcToolStripMenuItem_Click C# (CSharp) Метод

        private void arcToolStripMenuItem_Click(object sender, EventArgs e)
        {
            lastSelected = "arc";
            OnPaintAction = cr =>
            {
                double xc = 128.0;
                double yc = 128.0;
                double radius = 100.0;
                double angle1 = 45.0 * (Math.PI / 180.0);  /* angles are specified */
                double angle2 = 180.0 * (Math.PI / 180.0);  /* in radians           */

                cr.LineWidth = 10.0;
                cr.Arc(xc, yc, radius, angle1, angle2);
                cr.Stroke();

                /* draw helping lines */
                cr.SetSourceRGBA(1, 0.2, 0.2, 0.6);
                cr.LineWidth = 6.0;

                cr.Arc(xc, yc, 10.0, 0, 2 * Math.PI);
                cr.Fill();

                cr.Arc(xc, yc, radius, angle1, angle1);
                cr.LineTo(xc, yc);
                cr.Arc(xc, yc, radius, angle2, angle2);
                cr.LineTo(xc, yc);
                cr.Stroke();
            };

            Invalidate();
        }