/// <summary>
/// Draws the Circle.
/// </summary>
/// <param name="graphics"></param>
public override void Draw(Otter.Interface.Graphics graphics)
{
// Do not draw if there are less than 3 segments in the circle
if(Segments <= 2)
return;
Triangle[] triangles = new Triangle[Segments * 2];
double x = 1.0f;
double y = 0.0f;
float radius = ((CircleLayout)Layout).Radius;
uint halfWidth = ((CircleLayout)Layout).Width / 2;
Color color = ((CircleLayout)Layout).Color;
PointF center = new PointF(Layout.Size.Width / 2.0f, Layout.Size.Height / 2.0f);
// For each segment create two triangles
for (int i = 0; i < Segments; i++)
{
double angle1 = (i / (double)Segments) * Math.PI * 2;
double angle2 = ((i + 1) / (double)Segments) * Math.PI * 2;
float rx1 = (float)(x * Math.Cos(angle1) - y * Math.Sin(angle1));
float ry1 = (float)(x * Math.Sin(angle1) + y * Math.Cos(angle1));
float rx2 = (float)(x * Math.Cos(angle2) - y * Math.Sin(angle2));
float ry2 = (float)(x * Math.Sin(angle2) + y * Math.Cos(angle2));
triangles[i * 2 + 0] = new Triangle();
triangles[i * 2 + 0].SetVertex(0, center.X + rx1 * (radius + halfWidth), center.Y + ry1 * (radius + halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
triangles[i * 2 + 0].SetVertex(1, center.X + rx2 * (radius + halfWidth), center.Y + ry2 * (radius + halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
triangles[i * 2 + 0].SetVertex(2, center.X + rx1 * (radius - halfWidth), center.Y + ry1 * (radius - halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
triangles[i * 2 + 1] = new Triangle();
triangles[i * 2 + 1].SetVertex(0, center.X + rx1 * (radius - halfWidth), center.Y + ry1 * (radius - halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
triangles[i * 2 + 1].SetVertex(1, center.X + rx2 * (radius + halfWidth), center.Y + ry2 * (radius + halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
triangles[i * 2 + 1].SetVertex(2, center.X + rx2 * (radius - halfWidth), center.Y + ry2 * (radius - halfWidth), 0.0f, 0.0f, 0.0f, color.ToArgb());
}
graphics.DrawTriangles(-1, triangles);
}
