/// Drawing methods.
/// <devdoc>
/// </devdoc>
public void DrawPie(WindowsPen pen, Rectangle bounds, float startAngle, float sweepAngle)
{
HandleRef hdc = new HandleRef(this.dc, this.dc.Hdc);
if (pen != null)
{
// 1. Select the pen in the DC
IntUnsafeNativeMethods.SelectObject(hdc, new HandleRef(pen, pen.HPen));
}
// 2. call the functions
// we first draw a path that goes :
// from center of pie, draw arc (this draw the line to the beginning of the arc
// then, draw the closing line.
// paint the path with the pen
int sideLength = Math.Min(bounds.Width, bounds.Height);
Point p = new Point(bounds.X + sideLength / 2, bounds.Y + sideLength / 2);
int radius = sideLength / 2;
IntUnsafeNativeMethods.BeginPath(hdc);
IntUnsafeNativeMethods.MoveToEx(hdc, p.X, p.Y, null);
IntUnsafeNativeMethods.AngleArc(hdc, p.X, p.Y, radius, startAngle, sweepAngle);
IntUnsafeNativeMethods.LineTo(hdc, p.X, p.Y);
IntUnsafeNativeMethods.EndPath(hdc);
IntUnsafeNativeMethods.StrokePath(hdc);
}