(PECL ps >= 1.3.0)
ps_shading — Creates a shading for later use
$psdoc,$type,$x0,$y0,$x1,$y1,$c1,$c2,$c3,$c4,$optlistCreates a shading, which can be used by ps_shfill() or ps_shading_pattern().
The color of the shading can be in any color space except for
pattern.
psdocResource identifier of the postscript file as returned by ps_new().
type
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
c1 to c4
(see ps_setcolor() for their meaning).
x0, x1, y0, y1
The coordinates x0, y0,
x1, y1 are 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, c4See ps_setcolor() for their meaning.
optlist
If the shading is of type radial the
optlist must also contain the parameters
r0 and r1 with the radius of the
start and end circle.
Returns the identifier of the pattern 或者在失败时返回 false.