(PECL ps >= 1.1.0)
ps_curveto — Draws a curve
Add a section of a cubic Bézier curve described by the three given control points to the current path.
Resource identifier of the postscript file as returned by ps_new().
x-coordinate of first control point.
y-coordinate of first control point.
x-coordinate of second control point.
y-coordinate of second control point.
x-coordinate of third control point.
y-coordinate of third control point.
如果成功则返回 TRUE，失败则返回 FALSE。