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|
=begin header
gnome-canvas.rb - Affine transformation sample using Ruby/GnomeCanvas2.
$Author: mutoh $
$Date: 2006/06/29 18:24:23 $
Copyright (C) 2003-2006 Ruby-GNOME2 Project Team
Copyright (C) 2002,2003 KUBO Takehiro <kubo@jiubao.org>
=end
require 'gnomecanvas2'
class AffineApp < Gtk::Window
CANVAS_SIZE_X = 200
CANVAS_SIZE_Y = 100
TRANSLATE_X = 20
TRANSLATE_Y = 20
ITEM_SIZE_X = 20
ITEM_SIZE_Y = 20
# affine transformation to move to the center of the Canvas.
TRANS = Art::Affine.translate(CANVAS_SIZE_X / 2, CANVAS_SIZE_Y / 2)
def setup_canvas_frame(table, x, y, title, affine)
frame = Gtk::Frame.new(title)
frame.set_shadow_type(Gtk::SHADOW_IN)
table.attach(frame,
x, x + 1,
y, y + 1,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
Gtk::EXPAND | Gtk::FILL | Gtk::SHRINK,
0, 0)
frame.show
canvas = Gnome::Canvas.new()
canvas.set_size_request(CANVAS_SIZE_X, CANVAS_SIZE_Y)
canvas.set_scroll_region(0, 0, CANVAS_SIZE_X, CANVAS_SIZE_Y)
frame.add(canvas)
canvas.show()
points = [[CANVAS_SIZE_X / 2, 0], [CANVAS_SIZE_X / 2, CANVAS_SIZE_Y]]
Gnome::CanvasLine.new(canvas.root,
{:points => points,
:fill_color => "gray",
:width_pixels => 1})
points = [[0, CANVAS_SIZE_Y / 2], [CANVAS_SIZE_X, CANVAS_SIZE_Y / 2]]
Gnome::CanvasLine.new(canvas.root,
{:points => points,
:fill_color => "gray",
:width_pixels => 1})
group = Gnome::CanvasGroup.new(canvas.root, {})
Gnome::CanvasRect.new(group,
{:x1 => 0, :y1 => 0,
:x2 => - ITEM_SIZE_X / 2, :y2 => - ITEM_SIZE_Y / 2,
:fill_color => "blue"})
Gnome::CanvasRect.new(group,
{:x1 => 0, :y1 => 0,
:x2 => ITEM_SIZE_X / 2, :y2 => - ITEM_SIZE_Y / 2,
:fill_color => "red"})
Gnome::CanvasRect.new(group,
{:x1 => 0, :y1 => 0,
:x2 => - ITEM_SIZE_X / 2, :y2 => ITEM_SIZE_Y / 2,
:fill_color => "green"})
Gnome::CanvasRect.new(group,
{:x1 => 0, :y1 => 0,
:x2 => ITEM_SIZE_X / 2, :y2 => ITEM_SIZE_Y / 2,
:fill_color => "yellow"})
group.affine_relative(TRANS * affine)
end
def initialize
super(Gtk::Window::TOPLEVEL)
self.signal_connect("delete_event") do
Gtk::main_quit()
end
sw = Gtk::ScrolledWindow.new
sw.set_size_request(600, 400)
self.add(sw)
sw.show
affine = Array.new(5)
text = Array.new(5)
affine[0] = Art::Affine.identity
text[0] = 'No Conversion'
affine[1] = Art::Affine.scale(1, 2)
text[1] = 'Scale(1,2)'
affine[2] = Art::Affine.rotate(45)
text[2] = 'Rotate(45)'
affine[3] = Art::Affine.shear(45)
text[3] = 'Shear(45)'
affine[4] = Art::Affine.translate(TRANSLATE_X, TRANSLATE_Y)
text[4] = "Translate(#{TRANSLATE_X}, #{TRANSLATE_Y})"
table = Gtk::Table.new(affine.size, affine.size, false)
sw.add_with_viewport(table)
table.show
0.upto(affine.size - 1) do |x|
0.upto(affine.size - 1) do |y|
if x == 0
label = text[y]
elsif y == 0
label = text[x]
else
label = text[x] + ' * ' + text[y]
end
setup_canvas_frame(table, x, y, label, affine[x] * affine[y])
end
end
self.show
end
end
def main
AffineApp.new
Gtk::main
end
main
|
