46 lines
1.2 KiB
Ruby
46 lines
1.2 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-text-align-center.rb,v 1.1 2005/10/12 05:38:30 ktou Exp $
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=begin
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= cairo/Text Align Center
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This demo shows how to use GDK and cairo to show text in center.
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From http://cairographics.org/samples/text_align_center.html.
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=end
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require 'common'
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module Demo
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class CairoTextAlignCenter < CairoWindow
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TEXT = "Ruby"
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def initialize
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super('cairo text align center')
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end
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def draw(cr)
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cr.select_font_face("Sans",
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Cairo::FONT_SLANT_NORMAL,
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Cairo::FONT_WEIGHT_NORMAL)
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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.show_text(TEXT)
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# draw helping lines
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cr.set_source_rgba(1, 0.2, 0.2, 0.6)
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cr.arc(x, y, 0.05, 0, 2 * Math::PI)
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cr.fill
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cr.move_to(0.5, 0)
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cr.rel_line_to(0, 1)
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cr.move_to(0, 0.5)
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cr.rel_line_to(1, 0)
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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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