47 lines
1.1 KiB
Ruby
47 lines
1.1 KiB
Ruby
|
# Copyright (c) 2005 Ruby-GNOME2 Project Team
|
||
|
|
# This program is licenced under the same licence as Ruby-GNOME2.
|
||
|
|
#
|
||
|
|
# $Id: cairo-text-extents.rb,v 1.1 2005/10/12 05:38:30 ktou Exp $
|
||
|
|
=begin
|
||
|
|
= cairo/Text Extents
|
||
|
|
|
||
|
|
This demo shows how to use GDK and cairo to show text extents.
|
||
|
|
From http://cairographics.org/samples/text.html.
|
||
|
|
=end
|
||
|
|
require 'common'
|
||
|
|
|
||
|
|
module Demo
|
||
|
|
class CairoTextExtents < CairoWindow
|
||
|
|
TEXT = "Ruby"
|
||
|
|
|
||
|
|
def initialize
|
||
|
|
super('cairo text')
|
||
|
|
end
|
||
|
|
|
||
|
|
def draw(cr)
|
||
|
|
cr.select_font_face("Sans",
|
||
|
|
Cairo::FONT_SLANT_NORMAL,
|
||
|
|
Cairo::FONT_WEIGHT_NORMAL)
|
||
|
|
|
||
|
|
cr.set_font_size(0.3)
|
||
|
|
extents = cr.text_extents(TEXT)
|
||
|
|
|
||
|
|
x = 0.1
|
||
|
|
y = 0.6
|
||
|
|
|
||
|
|
cr.move_to(x, y)
|
||
|
|
cr.show_text(TEXT)
|
||
|
|
|
||
|
|
# draw helping lines
|
||
|
|
cr.set_source_rgba(1, 0.2, 0.2, 0.6)
|
||
|
|
cr.arc(x, y, 0.05, 0, 2 * Math::PI)
|
||
|
|
cr.fill
|
||
|
|
cr.move_to(x, y)
|
||
|
|
cr.rel_line_to(0, -extents.height)
|
||
|
|
cr.rel_line_to(extents.width, 0)
|
||
|
|
cr.rel_line_to(extents.x_bearing, -extents.y_bearing)
|
||
|
|
cr.stroke
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|