#!/usr/bin/env python# example scribblesimple.py # GTK - The GIMP Toolkit # Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald # Copyright (C) 2001-2004 John Finlay # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Library General Public # License as published by the Free Software Foundation; either # version 2 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU # Library General Public License for more details. # # You should have received a copy of the GNU Library General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA.import pygtkpygtk.require('2.0')import gtk# Backing pixmap for drawing areapixmap = None# Create a new backing pixmap of the appropriate sizedef configure_event(widget, event):    global pixmap    x, y, width, height = widget.get_allocation()    pixmap = gtk.gdk.Pixmap(widget.window, width, height)    pixmap.draw_rectangle(widget.get_style().white_gc,                          True, 0, 0, width, height)    return True# Redraw the screen from the backing pixmapdef expose_event(widget, event):    x , y, width, height = event.area    widget.window.draw_drawable(widget.get_style().fg_gc[gtk.STATE_NORMAL],                                pixmap, x, y, x, y, width, height)    return False# Draw a rectangle on the screendef draw_brush(widget, x, y):    rect = (int(x-5), int(y-5), 10, 10)    pixmap.draw_rectangle(widget.get_style().black_gc, True,                          rect[0], rect[1], rect[2], rect[3])    widget.queue_draw_area(rect[0], rect[1], rect[2], rect[3])def button_press_event(widget, event):    if event.button == 1 and pixmap != None:        draw_brush(widget, event.x, event.y)    return Truedef motion_notify_event(widget, event):    if event.is_hint:        x, y, state = event.window.get_pointer()    else:        x = event.x        y = event.y        state = event.state        if state & gtk.gdk.BUTTON1_MASK and pixmap != None:        draw_brush(widget, x, y)      return Truedef main():    window = gtk.Window(gtk.WINDOW_TOPLEVEL)    window.set_name ("Test Input")    vbox = gtk.VBox(False, 0)    window.add(vbox)    vbox.show()    window.connect("destroy", lambda w: gtk.main_quit())    # Create the drawing area    drawing_area = gtk.DrawingArea()    drawing_area.set_size_request(200, 200)    vbox.pack_start(drawing_area, True, True, 0)    drawing_area.show()    # Signals used to handle backing pixmap    drawing_area.connect("expose_event", expose_event)    drawing_area.connect("configure_event", configure_event)    # Event signals    drawing_area.connect("motion_notify_event", motion_notify_event)    drawing_area.connect("button_press_event", button_press_event)    drawing_area.set_events(gtk.gdk.EXPOSURE_MASK                            | gtk.gdk.LEAVE_NOTIFY_MASK                            | gtk.gdk.BUTTON_PRESS_MASK                            | gtk.gdk.POINTER_MOTION_MASK                            | gtk.gdk.POINTER_MOTION_HINT_MASK)    # .. And a quit button    button = gtk.Button("Quit")    vbox.pack_start(button, False, False, 0)    button.connect_object("clicked", lambda w: w.destroy(), window)    button.show()    window.show()    gtk.main()    return 0if __name__ == "__main__":    main()