public override void DrawEllipse(PBrush c, float width, RectangleF rect)
{
const int DETAIL = 50;
float x = (rect.Left + rect.Right) / 2f;
float y = (rect.Top + rect.Bottom) / 2f;
float rx = (rect.Right - rect.Left) / 2f;
float ry = (rect.Bottom - rect.Top) / 2f;
float w = 1 - width * 2f / (rx + ry);
if (c != null)
{
GL.Color(c.GetColor());
}
GL.Begin(PrimitiveType.QUADS);
double lA = 0;
for (int i = 1; i <= DETAIL; i++)
{
double a = i * Math.PI * 2.0 / DETAIL;
float sin1 = (float)Math.Sin(lA);
float cos1 = (float)Math.Cos(lA);
float sin2 = (float)Math.Sin(a);
float cos2 = (float)Math.Cos(a);
float[] ptsx = new float[] { cos1, cos1 *w, cos2 *w, cos2 };
float[] ptsy = new float[] { sin1, sin1 *w, sin2 *w, sin2 };
NativeGL.nglVertex2fTrans(4, ptsx, ptsy, x, y, rx, ry);
lA = a;
}
GL.End();
}
public override void FillEllipse(PBrush c, RectangleF rect)
{
float x = (rect.Left + rect.Right) / 2f;
float y = (rect.Top + rect.Bottom) / 2f;
float rx = (rect.Right - rect.Left) / 2f;
float ry = (rect.Bottom - rect.Top) / 2f;
if (c != null)
{
GL.Color(c.GetColor());
}
GL.Begin(PrimitiveType.TRIANGLES);
NativeGL.nglVertex2fTrans(pEllipseX.Length, pEllipseX, pEllipseY, x, y, rx, ry);
GL.End();
}
public override void Circle(float x, float y, float r)
{
NativeGL.nglVertex2fTrans(pEllipseX.Length, pEllipseX, pEllipseY,
x, y, r, r);
}