Name
cpattern:AddColorStopRGBA -- add RGBA color stop
Synopsis
cpattern:AddColorStopRGBA(offset, red, green, blue, alpha)
Function
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.

The color is specified in the same way as in ccontext:SetSourceRGBA().

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, (e.g. a linear or radial pattern), then the pattern will be put into an error status with a status of #CAIRO_STATUS_PATTERN_TYPE_MISMATCH.

Inputs
offset
an offset in the range [0.0 .. 1.0]
red
red component of color
green
green component of color
blue
blue component of color
alpha
alpha component of color
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