The ScrollRegion of the canvas gives the area that should be "available" for scrolling. If this is larger than the visible area of the canvas, then associated scrollbars will allow scrolling. If this is smaller than the visible area of the canvas, then the scrollbar will fill with the "thumb" and no scrolling is possible.
Here is an application that creates a 5000x5000 canvas and allows
scrolling. The scrollbars react appropriately when the window is
resized.
from Tkinter import *
t = Tk()
c = Canvas(t)
hsb = Scrollbar(t, orient="h", command=c.xview)
vsb = Scrollbar(t, orient="v", command=c.yview)
c.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
c.grid(row=0, column=0, sticky="nsew")
hsb.grid(row=1, column=0, stick="ew")
vsb.grid(row=0, column=1, sticky="ns")
t.grid_rowconfigure(0, weight=1)
t.grid_columnconfigure(0, weight=1)
c.configure(scrollregion = (0, 0, 5000, 5000))
for x in range(100, 5000, 100):
for y in range(100, 5000, 100):
c.create_text((x,y), anchor=CENTER, text="%d,%d" % (x,y))
t.mainloop()
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