RGtk2 (version 2.20.31)

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

cr

[Cairo] a cairo context

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)).