1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
# Copyright (c) 2005 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
# $Id: cairo-gradient.rb,v 1.2 2005/10/12 15:23:49 ktou Exp $
=begin
= cairo/Gradient
This demo shows how to use GDK and cairo to gradient.
From http://cairographics.org/samples/gradient.html.
=end
require 'common'
module Demo
class CairoGradient < CairoWindow
def initialize
super('cairo gradient')
end
def draw(cr)
pat = Cairo::LinearPattern.new(0.0, 0.0, 0.0, 1.0)
pat.add_color_stop_rgb(1, 0, 0, 0)
pat.add_color_stop_rgb(0, 1, 0, 0)
cr.rectangle(0, 0, 1, 1)
cr.set_source(pat)
cr.fill
pat = Cairo::RadialPattern.new(0.45, 0.4, 0.1, 0.4, 0.4, 0.5)
pat.add_color_stop_rgba(0, 1, 1, 1, 0.8)
pat.add_color_stop_rgba(1, 0, 0, 0)
cr.set_source(pat)
cr.arc(0.5, 0.5, 0.3, 0, 2 * Math::PI)
cr.fill
end
end
end
|
