91 lines
1.9 KiB
Ruby
91 lines
1.9 KiB
Ruby
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=begin
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drawing.rb - Gtk::Drawing sample script.
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Copyright (c) 2002-2006 Ruby-GNOME2 Project Team
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This program is licenced under the same licence as Ruby-GNOME2.
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$Id: drawing.rb,v 1.7 2006/06/17 13:18:12 mutoh Exp $
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=end
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require 'gtk2'
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class Canvas < Gtk::DrawingArea
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def initialize
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super
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signal_connect("expose_event") { |w,e| expose_event(w,e) }
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signal_connect("configure_event") { |w, e| configure_event(w,e) }
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@buffer = nil
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@bgc = nil
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end
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def expose_event(w,e)
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unless @buffer.nil?
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rec = e.area
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w.window.draw_drawable(@bgc, @buffer, rec.x, rec.y,
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rec.x, rec.y, rec.width, rec.height)
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end
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false
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end
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def clear(b = @buffer)
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return if b.nil?
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g = b.size
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@bgc = self.style.bg_gc(self.state) if @bgc.nil?
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if (g[0] > 0 && g[1] > 0)
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b.draw_rectangle(@bgc, true, 0,0, g[0], g[1])
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end
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end
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def configure_event(w,e)
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g = w.window.geometry
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if (g[2] > 0 && g[3] > 0)
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b = Gdk::Pixmap::new(w.window, g[2], g[3], -1)
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clear(b)
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if not @buffer.nil?
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g = @buffer.size
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b.draw_drawable(@bgc, @buffer, 0, 0, 0, 0, g[0], g[1])
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end
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@buffer = b
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end
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true
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end
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end
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class A < Canvas
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def initialize
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super
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signal_connect("button_press_event") { |w,e| pressed(w,e) }
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set_events(Gdk::Event::BUTTON_PRESS_MASK)
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end
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def pressed(widget, ev)
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if not @last.nil?
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@buffer.draw_line(widget.style.fg_gc(widget.state),
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@last.x, @last.y, ev.x, ev.y)
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x1,x2 = if (@last.x < ev.x)
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then [@last.x, ev.x]
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else [ev.x, @last.x]
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end
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y1,y2 = if (@last.y < ev.y)
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then [@last.y, ev.y]
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else [ev.y, @last.y]
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end
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widget.queue_draw_area(x1, y1, x2 - x1 + 1, y2 - y1 + 1)
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end
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@last = nil
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@last = ev
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true
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end
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end
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window = Gtk::Window.new("drawing test")
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window.signal_connect("destroy") { Gtk.main_quit }
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canvas = A.new
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window.add(canvas)
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window.show_all
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Gtk::main
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