1 from Tkinter import *

     2 

     3 class Test(Frame):

     4     def printit(self):

     5         print "hi"

     6 

     7     def createWidgets(self):

     8         self.QUIT = Button(self, text='QUIT',

     9                                   background='red',

    10                                   foreground='white',

    11                                   height=3,

    12                                   command=self.quit)

    13         self.QUIT.pack(side=BOTTOM, fill=BOTH)

    14 

    15         self.canvasObject = Canvas(self, width="5i", height="5i")

    16         self.canvasObject.pack(side=LEFT)

    17 

    18     def mouseDown(self, event):

    19         # canvas x and y take the screen coords from the event and translate

    20         # them into the coordinate system of the canvas object

    21         self.startx = self.canvasObject.canvasx(event.x)

    22         self.starty = self.canvasObject.canvasy(event.y)

    23 

    24     def mouseMotion(self, event):

    25         # canvas x and y take the screen coords from the event and translate

    26         # them into the coordinate system of the canvas object

    27         x = self.canvasObject.canvasx(event.x)

    28         y = self.canvasObject.canvasy(event.y)

    29 

    30         if (self.startx != event.x)  and (self.starty != event.y) :

    31             self.canvasObject.delete(self.rubberbandBox)

    32             self.rubberbandBox = self.canvasObject.create_rectangle(

    33                 self.startx, self.starty, x, y)

    34             # this flushes the output, making sure that

    35             # the rectangle makes it to the screen

    36             # before the next event is handled

    37             self.update_idletasks()

    38 

    39     def mouseUp(self, event):

    40         self.canvasObject.delete(self.rubberbandBox)

    41 

    42     def __init__(self, master=None):

    43         Frame.__init__(self, master)

    44         Pack.config(self)

    45         self.createWidgets()

    46 

    47         # this is a "tagOrId" for the rectangle we draw on the canvas

    48         self.rubberbandBox = None

    49 

    50         # and the bindings that make it work..

    51         Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)

    52         Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)

    53         Widget.bind(self.canvasObject, "<Button1-ButtonRelease>", self.mouseUp)

    54 

    55 

    56 test = Test()

    57 

    58 test.mainloop()