/// <summary>
/// b and c are controllers. a and d are statics. AB is origin and CD is dest
/// </summary>
/// <param name="dest"> </param>
/// <param name="ptA"> </param>
/// <param name="ptB"> dest </param>
/// <param name="ptC"> </param>
/// <param name="ptD"> </param>
/// <param name="t"> </param>
public static void DGetBezierValue(out DVector2 dest, DVector2 ptA, DVector2 ptB, DVector2 ptC, DVector2 ptD, double t)
{
var ab = new DVector2();
var bc = new DVector2();
var cd = new DVector2();
var abbc = new DVector2();
var bccd = new DVector2();
dest = new DVector2();
DLerp(ref ab, ptA, ptB, t);
DLerp(ref bc, ptB, ptC, t);
DLerp(ref cd, ptC, ptD, t);
DLerp(ref abbc, ab, bc, t);
DLerp(ref bccd, bc, cd, t);
DLerp(ref dest, abbc, bccd, t);
}
static void DLerp(ref DVector2 dest, DVector2 a, DVector2 b, double t)
{
dest.X = a.X + (b.X - a.X)*t;
dest.Y = a.Y + (b.Y - a.Y)*t;
}
