/// <summary>
/// Gets the normal for the given time.
/// </summary>
/// <param name="time">The time</param>
/// <returns>The normal.</returns>
public Vector2 GetPositionNormal(float time)
{
float offsetTime = time + 0.0001f;
Vector2 a = GetPosition(time);
Vector2 b = GetPosition(offsetTime);
Vector2 output, temp;
Vector2.Subtract(ref a, ref b, out temp);
#if (XBOX360 || WINDOWS_PHONE)
output = new Vector2();
#endif
output.X = -temp.Y;
output.Y = temp.X;
Vector2.Normalize(ref output, out output);
return(output);
}
public static float DistanceBetweenPointAndLineSegment(ref Vector2 point, ref Vector2 lineEndPoint1, ref Vector2 lineEndPoint2)
{
Vector2 v = Vector2.Subtract(lineEndPoint2, lineEndPoint1);
Vector2 w = Vector2.Subtract(point, lineEndPoint1);
float c1 = Vector2.Dot(w, v);
if (c1 <= 0)
{
return(DistanceBetweenPointAndPoint(ref point, ref lineEndPoint1));
}
float c2 = Vector2.Dot(v, v);
if (c2 <= c1)
{
return(DistanceBetweenPointAndPoint(ref point, ref lineEndPoint2));
}
float b = c1 / c2;
Vector2 pointOnLine = Vector2.Add(lineEndPoint1, Vector2.Multiply(v, b));
return(DistanceBetweenPointAndPoint(ref point, ref pointOnLine));
}
public static float DistanceBetweenPointAndPoint(ref Vector2 point1, ref Vector2 point2)
{
Vector2 v;
Vector2.Subtract(ref point1, ref point2, out v);
return v.Length;
}
