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# Copyright (c) 2005 Ruby-GNOME2 Project Team
# This program is licenced under the same licence as Ruby-GNOME2.
#
# $Id: cairo-pattern-fill.rb,v 1.1 2005/10/12 05:38:30 ktou Exp $
=begin
= cairo/Pattern Fill
This demo shows how to use GDK and cairo to fill by pattern.
From http://cairographics.org/samples/pattern_fill.html.
=end
require 'common'
module Demo
class CairoPatternFill < CairoWindow
X_FUZZ = 0.08
Y_FUZZ = 0.08
X_INNER_RADIUS = 0.3
Y_INNER_RADIUS = 0.2
X_OUTER_RADIUS = 0.45
Y_OUTER_RADIUS = 0.35
SPIKES = 10
TEXT = "Ruby!"
def initialize
super('cairo pattern fill')
end
def draw(cr)
srand(45)
cr.set_line_width(0.01)
x = y = nil
0.step(SPIKES * 2 - 1, 2) do |i|
x = x_position(i, X_INNER_RADIUS)
y = y_position(i, Y_INNER_RADIUS)
if (i == 0)
cr.move_to(x, y)
else
cr.line_to(x, y)
end
i += 1
x = x_position(i, X_OUTER_RADIUS)
y = y_position(i, Y_OUTER_RADIUS)
cr.line_to(x, y)
end
cr.close_path
cr.stroke
cr.select_font_face("Sans",
Cairo::FONT_SLANT_NORMAL,
Cairo::FONT_WEIGHT_BOLD)
cr.move_to(x - 0.5, y)
cr.set_font_size(0.1)
cr.text_path(TEXT)
cr.set_source_rgba(1, 0, 0.5)
cr.fill
cr.set_font_size(0.2)
extents = cr.text_extents(TEXT)
x = 0.5 - (extents.width / 2 + extents.x_bearing)
y = 0.5 - (extents.height / 2 + extents.y_bearing)
cr.move_to(x, y)
cr.text_path(TEXT)
cr.set_source_rgba(1, 0, 0)
cr.stroke
end
def x_position(i, radius)
0.5 + Math.cos(Math::PI * i / SPIKES) * radius + rand * X_FUZZ
end
def y_position(i, radius)
0.5 + Math.sin(Math::PI * i / SPIKES) * radius + rand * Y_FUZZ
end
end
end
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