// Split a bezier at a particular point into two beziers. Returns false if the point
// isn't within error of the bezier.
public bool SplitAtPoint(PointF point, float error, out Bezier bez1, out Bezier bez2)
{
bez1 = bez2 = new Bezier();
float t = FindCoefficient(point, error);
if (float.IsNaN(t))
return false;
SplitAtCoefficient(t, out bez1, out bez2);
return true;
}
// Split a bezier at a particular value of t into two beziers of each half
public void SplitAtCoefficient(float t, out Bezier bez1, out Bezier bez2)
{
float s = 1 - t;
PointF f00t, f01t, f11t, f0tt, f1tt, fttt;
f00t = f01t = f11t = f0tt = f1tt = fttt = new PointF();
f00t.X = s * end1.X + t * control1.X;
f00t.Y = s * end1.Y + t * control1.Y;
f01t.X = s * control1.X + t * control2.X;
f01t.Y = s * control1.Y + t * control2.Y;
f11t.X = s * control2.X + t * end2.X;
f11t.Y = s * control2.Y + t * end2.Y;
f0tt.X = s * f00t.X + t * f01t.X;
f0tt.Y = s * f00t.Y + t * f01t.Y;
f1tt.X = s * f01t.X + t * f11t.X;
f1tt.Y = s * f01t.Y + t * f11t.Y;
fttt.X = s * f0tt.X + t * f1tt.X;
fttt.Y = s * f0tt.Y + t * f1tt.Y;
bez1 = new Bezier(end1, f00t, f0tt, fttt);
bez2 = new Bezier(fttt, f1tt, f11t, end2);
}
