在PyGobject中绘图(python3)

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk

class DrawingAreaExample(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="Drawing Area Example")
        self.set_default_size(400, 300)

        drawing_area = Gtk.DrawingArea()
        drawing_area.connect("draw", self.on_draw_event)
        self.add(drawing_area)

    def on_draw_event(self, widget, cr):
        cr.set_source_rgb(0, 0, 0)
        cr.set_line_width(1)
        cr.move_to(50, 50)
        cr.line_to(350, 250)
        cr.stroke()

win = DrawingAreaExample()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

sudo apt-get install python3-gi python3-gi-cairo