changer scroll region

bonjour
je voudrais que la scroll region soit décalée plus en haut et à gauche au lancement, ici la scroll region part de (0,0) du canvas, je voudrais par exemple avoir (-50,-50) en haut à gauche au départ, comment changer ça?

Code:

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import Tkinter
 
class Tester(Tkinter.Frame):
 
    def __init__(self, root):
        Tkinter.Frame.__init__(self, root, relief=Tkinter.SUNKEN, bd=2)
        self.top = root
        self.canvas = Tkinter.Canvas(self.top, width=100, height=100, scrollregion=(-400, -400, 700, 700))
        hsb = Tkinter.Scrollbar(root, orient="h", command=self.canvas.xview)
        vsb = Tkinter.Scrollbar(root, orient="v", command=self.canvas.yview)
        self.canvas.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
        self.canvas.grid(row=0, column=0, sticky="nsew")
        self.canvas.create_text(10, 100, text="10")
        self.canvas.create_text(10, 200, text="20")
        self.canvas.create_text(8, 240, text="y")
        self.canvas.create_line(-500, 0, 1000, 0)
        self.canvas.create_text(100, 8, text="10")
        self.canvas.create_text(200, 8, text="20")
        self.canvas.create_text(240, 7, text="x")
        self.canvas.create_line(0, -500, 0, 1000)
        hsb.grid(row=1, column=0, stick="ew")
        vsb.grid(row=0, column=1, sticky="ns")
        root.grid_rowconfigure(0, weight=1)
        root.grid_columnconfigure(0, weight=1)
 
        self.menubar = Tkinter.Menu(self)
        menu = Tkinter.Menu(self.menubar, tearoff=0)
        self.menubar.add_cascade(label="File", menu=menu)
        menu.add_command(label="New")
        menu = Tkinter.Menu(self.menubar, tearoff=0)
        self.menubar.add_cascade(label="Edit", menu=menu)
        menu.add_command(label="Cut")
        menu.add_command(label="Copy")
        menu.add_command(label="Paste")
        try:
            self.master.config(menu=self.menubar)
        except AttributeError:
            # master is a toplevel window (Python 1.4/Tkinter 1.63)
            self.master.tk.call(root, "config", "-menu", self.menubar)
 
 
root = Tkinter.Tk()
root.geometry("+300+300")
Tester(root)
root.mainloop()

j'ai essayé la methode .set(lo,hi) mais c'est sans effet

import Tkinter class Tester(Tkinter.Frame): def __init__(self, root): Tkinter.Frame.__init__(self, root, relief=Tkinter.SUNKEN, bd=2) self.canvas = Tkinter.Canvas(root, width=100, height=100, scrollregion=(-400, -400, 700, 700)) hsb = Tkinter.Scrollbar(root, orient="h", command=self.canvas.xview) vsb = Tkinter.Scrollbar(root, orient="v", command=self.canvas.yview) self.canvas.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set) self.canvas.grid(row=0, column=0, sticky="nsew") self.canvas.create_text(10, 100, text="10") self.canvas.create_text(10, 200, text="20") self.canvas.create_text(8, 240, text="y") self.canvas.create_line(-500, 0, 1000, 0) self.canvas.create_text(100, 8, text="10") self.canvas.create_text(200, 8, text="20") self.canvas.create_text(240, 7, text="x") self.canvas.create_line(0, -500, 0, 1000) self.canvas.yview_moveto(0.0) self.canvas.xview_moveto(0.0) hsb.grid(row=1, column=0, stick="ew") vsb.grid(row=0, column=1, sticky="ns") root.grid_rowconfigure(0, weight=1) root.grid_columnconfigure(0, weight=1) self.menubar = Tkinter.Menu(self) menu = Tkinter.Menu(self.menubar, tearoff=0) self.menubar.add_cascade(label="File", menu=menu) menu.add_command(label="New") menu = Tkinter.Menu(self.menubar, tearoff=0) self.menubar.add_cascade(label="Edit", menu=menu) menu.add_command(label="Cut") menu.add_command(label="Copy") menu.add_command(label="Paste") try: self.master.config(menu=self.menubar) except AttributeError: # master is a toplevel window (Python 1.4/Tkinter 1.63) self.master.tk.call(root, "config", "-menu", self.menubar) root = Tkinter.Tk() root.geometry("+300+300") Tester(root) root.mainloop()