Current File : //lib64/python2.7/Demo/tkinter/matt/canvas-gridding.py
from Tkinter import *
# this is the same as simple-demo-1.py, but uses
# subclassing.
# note that there is no explicit call to start Tk.
# Tkinter is smart enough to start the system if it's not already going.
class Test(Frame):
def printit(self):
print "hi"
def createWidgets(self):
self.QUIT = Button(self, text='QUIT',
background='red',
foreground='white',
height=3,
command=self.quit)
self.QUIT.pack(side=BOTTOM, fill=BOTH)
self.canvasObject = Canvas(self, width="5i", height="5i")
self.canvasObject.pack(side=LEFT)
def mouseDown(self, event):
# canvas x and y take the screen coords from the event and translate
# them into the coordinate system of the canvas object
self.startx = self.canvasObject.canvasx(event.x, self.griddingSize)
self.starty = self.canvasObject.canvasy(event.y, self.griddingSize)
def mouseMotion(self, event):
# canvas x and y take the screen coords from the event and translate
# them into the coordinate system of the canvas object
x = self.canvasObject.canvasx(event.x, self.griddingSize)
y = self.canvasObject.canvasy(event.y, self.griddingSize)
if (self.startx != event.x) and (self.starty != event.y) :
self.canvasObject.delete(self.rubberbandBox)
self.rubberbandBox = self.canvasObject.create_rectangle(
self.startx, self.starty, x, y)
# this flushes the output, making sure that
# the rectangle makes it to the screen
# before the next event is handled
self.update_idletasks()
def __init__(self, master=None):
Frame.__init__(self, master)
Pack.config(self)
self.createWidgets()
# this is a "tagOrId" for the rectangle we draw on the canvas
self.rubberbandBox = None
# this is the size of the gridding squares
self.griddingSize = 50
Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)
Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)
test = Test()
test.mainloop()
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