- pt1
A System.Drawing.PointF that represents the starting point of the curve.
- pt2
A System.Drawing.PointF that represents the first control point for the curve.
- pt3
A System.Drawing.PointF that represents the second control point for the curve.
- pt4
A System.Drawing.PointF that represents the endpoint of the curve.
The cubic curve is constructed from the first point to the fourth point by using the second and third points as control points.
If there is a previous line or curve segment in the figure, a line is added to connect the endpoint of the previous segment to the starting point of the cubic curve.