/// <summary>
/// Return an list of points defining an isosceles triangle
/// </summary>
/// <param name="pos">The base location</param>
/// <param name="range">The height of the triangle</param>
/// <param name="angle">The rotation angle of the triangle</param>
/// <param name="halfangle">Half the angle between the 2 longer sides</param>
/// <returns>The isosceles triangle</returns>
public static PointF[] CreateHitTriangle(this PointF pos, float range, float angle, float halfangle)
{
PointF[] pts = new PointF[3];
pts[0] = pos;
pts[1] = pos.CalculateNewPoint(angle.ContinuousAngleAddition(halfangle), range);
pts[2] = pos.CalculateNewPoint(angle.ContinuousAngleSubtraction(halfangle), range);
return(pts);
}