cairoSetSourceRgba: cairoSetSourceRgba
Description
Sets the source pattern within cr to a translucent color. This
color will then be used for any subsequent drawing operation until
a new source pattern is set.Usage
cairoSetSourceRgba(cr, red, green, blue, alpha)
Arguments
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 and alpha components are floating point numbers in the
range 0 to 1. If the values passed in are outside that range, they
will be clamped.
The default source pattern is opaque black, (that is, it is
equivalent to cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0)).