cairoPatternAddColorStopRgba: cairoPatternAddColorStopRgba
Description
Adds a translucent color stop to a gradient pattern. The offset
specifies the location along the gradient's control vector. For
example, a linear gradient's control vector is from (x0,y0) to
(x1,y1) while a radial gradient's control vector is from any point
on the start circle to the corresponding point on the end circle.Usage
cairoPatternAddColorStopRgba(pattern, offset, red, green, blue, alpha)
Arguments
offset
[numeric] an offset in the range [0.0 .. 1.0]
red
[numeric] red component of color
green
[numeric] green component of color
blue
[numeric] blue component of color
alpha
[numeric] alpha component of color
Details
The color is specified in the same way as in cairoSetSourceRgba.
If two (or more) stops are specified with identical offset values,
they will be sorted according to the order in which the stops are
added, (stops added earlier will compare less than stops added
later). This can be useful for reliably making sharp color
transitions instead of the typical blend.
Note: If the pattern is not a gradient pattern, (eg. a linear or
radial pattern), then the pattern will be put into an error status
with a status of CAIRO_STATUS_PATTERN_TYPE_MISMATCH.