animation-w-velocity-ctrl.py

reduced python source for embedded apps

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', foreground='red', 
			   command=self.quit)
	self.QUIT.pack(side=BOTTOM, fill=BOTH)

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

	self.speed = Scale(self, orient=HORIZONTAL, from_=-100, to=100)

	self.speed.pack(side=BOTTOM, fill=X)

	# all of these work..
	self.draw.create_rectangle(0, 0, 10, 10, tags="thing", fill="blue")
	self.draw.pack(side=LEFT)

    def moveThing(self, *args):
	velocity = self.speed.get()
	str = float(velocity) / 1000.0
	str = `str` + "i"
	self.draw.move("thing",  str, str)
	self.after(10, self.moveThing)

    def __init__(self, master=None):
	Frame.__init__(self, master)
	Pack.config(self)
	self.createWidgets()
	self.after(10, self.moveThing)


test = Test()

test.mainloop()