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