int ps_shading ( resource
ps_shading — Creates a shading for later use
Resource identifier of the postscript file as returned by ps_new().
The type of shading can be either radial or axial. Each shading starts with the current fill color and ends with the given color values passed in the parameters
c4(see ps_setcolor() for their meaning).
x0, x1, y0, y1
y1are the start and end point of the shading. If the type of shading is radial the two points are the middle points of a starting and ending circle.
c1, c2, c3, c4
See ps_setcolor() for their meaning.
If the shading is of type radial the
optlistmust also contain the parameters r0 and r1 with the radius of the start and end circle.