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.rubberbandLine) 32 self.rubberbandLine = self.canvasObject.create_line( 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 __init__(self, master=None): 40 Frame.__init__(self, master) 41 Pack.config(self) 42 self.createWidgets() 43 # this is a "tagOrId" for the rectangle we draw on the canvas 44 self.rubberbandLine = None 45 Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown) 46 Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion) 47 48 49 test = Test() 50 51 test.mainloop() 52
