RGtk2: cairoSetSourceRgba – R documentation

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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)).

Author(s)

Derived by RGtkGen from GTK+ documentation

RGtk2

R Bindings for Gtk 2.8.0 and Above

v2.20.36

GPL

Authors

Michael Lawrence <michafla@gene.com> and Duncan Temple Lang <duncan@wald.ucdavis.edu>

Initial release