77 lines
2.4 KiB
Ruby
77 lines
2.4 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-curve-rectangle.rb,v 1.1 2005/10/12 05:38:30 ktou Exp $
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=begin
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= cairo/Curve Rectangle
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This demo shows how to use GDK and cairo to draw curve rectangle.
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From http://cairographics.org/samples/curve_rectangle.html.
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=end
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require 'common'
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module Demo
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class CairoCurveRectangle < CairoWindow
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# a custom shape, that could be wrapped in a function
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X0 = 0.1 #< parameters like Cairo::Context#rectangle
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Y0 = 0.1
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RECT_WIDTH = 0.8
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RECT_HEIGHT = 0.8
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RADIUS = 0.4 #< and an approximate curvature radius
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X1 = X0 + RECT_WIDTH
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Y1 = Y0 + RECT_HEIGHT
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def initialize
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super('cairo curve rectangle')
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end
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def draw(cr)
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return if (RECT_WIDTH <= 0 || RECT_HEIGHT <= 0)
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if (RECT_WIDTH / 2 < RADIUS)
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if (RECT_HEIGHT / 2 < RADIUS)
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cr.move_to(X0, (Y0 + Y1) / 2)
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cr.curve_to(X0 ,Y0, X0, Y0, (X0 + X1) / 2, Y0)
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cr.curve_to(X1, Y0, X1, Y0, X1, (Y0 + Y1) / 2)
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cr.curve_to(X1, Y1, X1, Y1, (X1 + X0) / 2, Y1)
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cr.curve_to(X0, Y1, X0, Y1, X0, (Y0 + Y1) / 2)
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else
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cr.move_to(X0, Y0 + RADIUS)
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cr.curve_to(X0 ,Y0, X0, Y0, (X0 + X1) / 2, Y0)
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cr.curve_to(X1, Y0, X1, Y0, X1, Y0 + RADIUS)
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cr.line_to(X1 , Y1 - RADIUS)
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cr.curve_to(X1, Y1, X1, Y1, (X1 + X0) / 2, Y1)
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cr.curve_to(X0, Y1, X0, Y1, X0, Y1- RADIUS)
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end
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else
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if (RECT_HEIGHT / 2 < RADIUS)
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cr.move_to(X0, (Y0 + Y1) / 2)
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cr.curve_to(X0, Y0, X0 , Y0, X0 + RADIUS, Y0)
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cr.line_to(X1 - RADIUS, Y0)
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cr.curve_to(X1, Y0, X1, Y0, X1, (Y0 + Y1) / 2)
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cr.curve_to(X1, Y1, X1, Y1, X1 - RADIUS, Y1)
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cr.line_to(X0 + RADIUS, Y1)
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cr.curve_to(X0, Y1, X0, Y1, X0, (Y0 + Y1) / 2)
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else
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cr.move_to(X0, Y0 + RADIUS)
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cr.curve_to(X0 , Y0, X0 , Y0, X0 + RADIUS, Y0)
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cr.line_to(X1 - RADIUS, Y0)
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cr.curve_to(X1, Y0, X1, Y0, X1, Y0 + RADIUS)
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cr.line_to(X1 , Y1 - RADIUS)
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cr.curve_to(X1, Y1, X1, Y1, X1 - RADIUS, Y1)
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cr.line_to(X0 + RADIUS, Y1)
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cr.curve_to(X0, Y1, X0, Y1, X0, Y1- RADIUS)
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end
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end
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cr.close_path
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cr.set_source_rgba(0.5,0.5,1)
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cr.fill_preserve
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cr.set_source_rgba(0.5, 0, 0, 0.5)
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cr.stroke
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end
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end
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end
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