Draws a Bezier curve from the current point to the point
y2) as control points.
The document handle, returned by cpdf_open().
x-coordinate for the first control point
y-coordinate for the first control point
x-coordinate for the second control point
y-coordinate for the second control point
x-coordinate for the target
y-coordinate for the target
The optional parameter
determines the unit length. If it is 0 or omitted the default unit as specified
for the page is used. Otherwise the coordinates are measured in postscript
points disregarding the current unit.