Why doesn't this work?

[Michael Bakkemo]

Why doesn't the rectangle start somewhere in the middle of the canvas (where
one would expect (40,40) to be, instead of all the way over on the left?

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import Tkinter
import Pmw
import tkFont


class MovingRect:
    def __init__(self, master, sc, x, y,width, height):
        self.master = master
        self.sc = sc
        self.x = x
        self.y = y
        self.width = width
        self.height = height

        self.rectID = self.sc.create_rectangle(self.x, self.y,
self.x+self.width, self.y+self.height,fill="black", outline="black")

        self.poll()

    def poll(self):
        sc.move(self.rectID, 4, 0)

        self.timerID = self.master.after(500, self.poll)


    def width(self, width):
        self.width = width

    def height(self, height):
        self.height = height


    def Destroy(self):
        self.master.after_cancel(self.timerID)


def bail():
    menu.quit()
    rect.Destroy()


root = Tkinter.Tk()

# create a menu
menu = Tkinter.Menu(root)
root.config(menu=menu)

Quitmenu = Tkinter.Menu(menu)
menu.add_cascade(label="Quit", menu=Quitmenu)
Quitmenu.add_command(label="Quit", command=bail)

sc = Pmw.ScrolledCanvas(root, borderframe=1, hscrollmode='dynamic',
vscrollmode='dynamic')

sc.xview("moveto", 0)
sc.yview("moveto", 0)

sc.resizescrollregion()
sc.pack(fill='both',expand=1)

rect = MovingRect(root, sc, 40,40, 10, 10)
root.mainloop()