private void C1()
{
G1();
Point2D p0 = BSplineControlPoints[BSplineControlPoints.Count - 2];
Point2D p1 = BezierControlPoints.First();
Point2D p2 = BezierControlPoints[1];
BezierCurve.Scale(
new PointF(
(p1.Location.X - p0.Location.X) / (p2.Location.X - p1.Location.X),
(p1.Location.Y - p0.Location.Y) / (p2.Location.Y - p1.Location.Y)
),
p1.Location
);
float scale = BSplineCurve.Degree / (
BSplineCurve.Knots[BSplineCurve.ControlPointsNum - 1 + BSplineCurve.Degree] -
BSplineCurve.Knots[BSplineCurve.ControlPointsNum - 1]
);
scale /= BezierCurve.Degree;
BezierCurve.Scale(new PointF(scale, scale), p1.Location);
}
private void C0()
{
float deltaX = BSplineControlPoints.Last().Location.X - BezierControlPoints.First().Location.X;
float deltaY = BSplineControlPoints.Last().Location.Y - BezierControlPoints.First().Location.Y;
foreach (Point2D p in BezierControlPoints)
{
p.Location.X += deltaX;
p.Location.Y += deltaY;
}
}
private void G1()
{
C0();
Point2D p0 = BSplineControlPoints[BSplineControlPoints.Count - 2];
Point2D p1 = BezierControlPoints.First();
Point2D p2 = BezierControlPoints[1];
float angle = 0;
if (p1.Location.X - p0.Location.X <= 0 && p1.Location.Y - p0.Location.Y <= 0)
{
angle = (float)PI;
}
else if (p1.Location.X - p0.Location.X >= 0 && p1.Location.Y - p0.Location.Y <= 0)
{
angle = (float)(PI / 2);
}
else if (p1.Location.X - p0.Location.X <= 0 && p1.Location.Y - p0.Location.Y >= 0)
{
angle = (float)(-PI / 2);
}
BSplineCurve.Rotate(angle, p1.Location);
if (p2.Location.X - p1.Location.X <= 0 && p2.Location.Y - p1.Location.Y <= 0)
{
BezierCurve.Rotate((float)PI, p1.Location);
}
else if (p2.Location.X - p1.Location.X >= 0 && p2.Location.Y - p1.Location.Y <= 0)
{
BezierCurve.Rotate((float)(PI / 2), p1.Location);
}
else if (p2.Location.X - p1.Location.X <= 0 && p2.Location.Y - p1.Location.Y >= 0)
{
BezierCurve.Rotate((float)(-PI / 2), p1.Location);
}
BezierCurve.Rotate(
(float)(Atan(Abs(p2.Location.X - p1.Location.X) / Abs(p2.Location.Y - p1.Location.Y)) -
Atan(Abs(p1.Location.X - p0.Location.X) / Abs(p1.Location.Y - p0.Location.Y))),
p1.Location);
BezierCurve.Rotate(-angle, p1.Location);
BSplineCurve.Rotate(-angle, p1.Location);
}