#!/usr/bin/env python# example drawingarea.pyimport pygtkpygtk.require('2.0')import gtkimport operatorimport timeimport stringclass DrawingAreaExample:    def __init__(self):        window = gtk.Window(gtk.WINDOW_TOPLEVEL)        window.set_title("Drawing Area Example")        window.connect("destroy", lambda w: gtk.main_quit())        self.area = gtk.DrawingArea()        self.area.set_size_request(400, 300)        self.pangolayout = self.area.create_pango_layout("")        self.sw = gtk.ScrolledWindow()        self.sw.add_with_viewport(self.area)        self.table = gtk.Table(2,2)        self.hruler = gtk.HRuler()        self.vruler = gtk.VRuler()        self.hruler.set_range(0, 400, 0, 400)        self.vruler.set_range(0, 300, 0, 300)        self.table.attach(self.hruler, 1, 2, 0, 1, yoptions=0)        self.table.attach(self.vruler, 0, 1, 1, 2, xoptions=0)        self.table.attach(self.sw, 1, 2, 1, 2)        window.add(self.table)        self.area.set_events(gtk.gdk.POINTER_MOTION_MASK |                             gtk.gdk.POINTER_MOTION_HINT_MASK )        self.area.connect("expose-event", self.area_expose_cb)        def motion_notify(ruler, event):            return ruler.emit("motion_notify_event", event)        self.area.connect_object("motion_notify_event", motion_notify,                                 self.hruler)        self.area.connect_object("motion_notify_event", motion_notify,                                 self.vruler)        self.hadj = self.sw.get_hadjustment()        self.vadj = self.sw.get_vadjustment()        def val_cb(adj, ruler, horiz):            if horiz:                span = self.sw.get_allocation()[3]            else:                span = self.sw.get_allocation()[2]            l,u,p,m = ruler.get_range()            v = adj.value            ruler.set_range(v, v+span, p, m)            while gtk.events_pending():                gtk.main_iteration()        self.hadj.connect('value-changed', val_cb, self.hruler, True)        self.vadj.connect('value-changed', val_cb, self.vruler, False)        def size_allocate_cb(wid, allocation):            x, y, w, h = allocation            l,u,p,m = self.hruler.get_range()            m = max(m, w)            self.hruler.set_range(l, l+w, p, m)            l,u,p,m = self.vruler.get_range()            m = max(m, h)            self.vruler.set_range(l, l+h, p, m)        self.sw.connect('size-allocate', size_allocate_cb)        self.area.show()        self.hruler.show()        self.vruler.show()        self.sw.show()        self.table.show()        window.show()    def area_expose_cb(self, area, event):        self.style = self.area.get_style()        self.gc = self.style.fg_gc[gtk.STATE_NORMAL]        self.draw_point(10,10)        self.draw_points(110, 10)        self.draw_line(210, 10)        self.draw_lines(310, 10)        self.draw_segments(10, 100)        self.draw_rectangles(110, 100)        self.draw_arcs(210, 100)        self.draw_pixmap(310, 100)        self.draw_polygon(10, 200)        self.draw_rgb_image(110, 200)        return True    def draw_point(self, x, y):        self.area.window.draw_point(self.gc, x+30, y+30)        self.pangolayout.set_text("Point")        self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout)        return    def draw_points(self, x, y):        points = [(x+10,y+10), (x+10,y), (x+40,y+30),                  (x+30,y+10), (x+50,y+10)]        self.area.window.draw_points(self.gc, points)        self.pangolayout.set_text("Points")        self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout)        return    def draw_line(self, x, y):        self.area.window.draw_line(self.gc, x+10, y+10, x+20, y+30)        self.pangolayout.set_text("Line")        self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout)        return    def draw_lines(self, x, y):        points = [(x+10,y+10), (x+10,y), (x+40,y+30),                  (x+30,y+10), (x+50,y+10)]        self.area.window.draw_lines(self.gc, points)        self.pangolayout.set_text("Lines")        self.area.window.draw_layout(self.gc, x+5, y+50, self.pangolayout)        return    def draw_segments(self, x, y):        segments = ((x+20,y+10, x+20,y+70), (x+60,y+10, x+60,y+70),            (x+10,y+30 , x+70,y+30), (x+10, y+50 , x+70, y+50))        self.area.window.draw_segments(self.gc, segments)        self.pangolayout.set_text("Segments")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        return    def draw_rectangles(self, x, y):        self.area.window.draw_rectangle(self.gc, False, x, y, 80, 70)        self.area.window.draw_rectangle(self.gc, True, x+10, y+10, 20, 20)        self.area.window.draw_rectangle(self.gc, True, x+50, y+10, 20, 20)        self.area.window.draw_rectangle(self.gc, True, x+20, y+50, 40, 10)        self.pangolayout.set_text("Rectangles")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        return    def draw_arcs(self, x, y):        self.area.window.draw_arc(self.gc, False, x+10, y, 70, 70,                                  0, 360*64)        self.area.window.draw_arc(self.gc, True, x+30, y+20, 10, 10,                                  0, 360*64)        self.area.window.draw_arc(self.gc, True, x+50, y+20, 10, 10,                                  0, 360*64)        self.area.window.draw_arc(self.gc, True, x+30, y+10, 30, 50,                                  210*64, 120*64)        self.pangolayout.set_text("Arcs")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        return    def draw_pixmap(self, x, y):        pixmap, mask = gtk.gdk.pixmap_create_from_xpm(            self.area.window, self.style.bg[gtk.STATE_NORMAL], "gtk.xpm")        self.area.window.draw_drawable(self.gc, pixmap, 0, 0, x+15, y+25,                                       -1, -1)        self.pangolayout.set_text("Pixmap")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        return    def draw_polygon(self, x, y):        points = [(x+10,y+60), (x+10,y+20), (x+40,y+70),                  (x+30,y+30), (x+50,y+40)]        self.area.window.draw_polygon(self.gc, True, points)        self.pangolayout.set_text("Polygon")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        return    def draw_rgb_image(self, x, y):        b = 80*3*80*['\0']        for i in range(80):            for j in range(80):                b[3*80*i+3*j] = chr(255-3*i)                b[3*80*i+3*j+1] = chr(255-3*abs(i-j))                b[3*80*i+3*j+2] = chr(255-3*j)        buff = string.join(b, '')        self.area.window.draw_rgb_image(self.gc, x, y, 80, 80,                                 gtk.gdk.RGB_DITHER_NONE, buff, 80*3)        self.pangolayout.set_text("RGB Image")        self.area.window.draw_layout(self.gc, x+5, y+80, self.pangolayout)        returndef main():    gtk.main()    return 0if __name__ == "__main__":    DrawingAreaExample()    main()