private static void AddArc(ScreenSpaceLines3D line, Point3D center, double radius, int segments, double startAngle, double stopAngle, bool closeEnd)
{
startAngle = Math1D.DegreesToRadians(startAngle);
stopAngle = Math1D.DegreesToRadians(stopAngle);
// swap angles
if (startAngle > stopAngle)
{
double temp = startAngle;
startAngle = stopAngle;
stopAngle = temp;
}
Point3D[] points = new Point3D[segments + 1];
double inc = (stopAngle - startAngle) / segments;
double r = startAngle;
for (int i = 0; i <= segments; i++, r += inc)
{
points[i] = new Point3D(
center.X + (Math.Cos(-r) * radius),
center.Y + (Math.Sin(-r) * radius),
center.Z);
}
line.AddPolygon(closeEnd, points);
}
