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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
# Copyright (c) 2005 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
# $Id: cairo-image.rb,v 1.2 2005/10/16 12:07:32 mutoh Exp $
=begin
= cairo/Image
This demo shows how to use GDK and cairo to show image.
From http://cairographics.org/samples/image.html.
=end
require 'common'
module Demo
class CairoImage < CairoWindow
def initialize
super('cairo gradient')
end
def draw(cr)
cr.save do
loader = Gdk::PixbufLoader.new
File.open("background.jpg", "rb") do |f|
loader.last_write(f.read)
end
pixbuf = loader.pixbuf
cr.translate(0.5, 0.5)
cr.rotate(45 * Math::PI / 180)
cr.scale(1.0 / pixbuf.width, 1.0 / pixbuf.height)
cr.translate(-0.5 * pixbuf.width, -0.5 * pixbuf.height)
cr.set_source_pixbuf(pixbuf, 0, 0)
cr.paint
end
cr.save do
image = Cairo::ImageSurface.from_png("ruby-gnome2-logo.png")
cr.translate(0.5, 0.5)
cr.rotate(60 * Math::PI / 180)
cr.scale(0.8 / image.width, 0.8 / image.height)
cr.translate(-0.5 * image.width, -0.5 * image.height)
cr.set_source(image, 0, 0)
cr.paint
end
end
end
end
|
