from Tkinter import *

def run():
	root = Tk()
	global canvas
	canvas = Canvas(root, width = 400, height = 300)
	canvas.pack()
	#root.resizable(width=0,height=0)
	class Struct: pass
	canvas.data = Struct()
	init()
	drawball()
	root.mainloop()
	
	
def init():
	canvas.data.x0 = 10		# initial left-most edge of ball
	canvas.data.y0 = 10		# initial top-most edge of ball
	canvas.data.x1 = 50		# initial right-most edge of ball
	canvas.data.y1 = 50	# initial bottom edge of the ball
	
	canvas.data.dx = 4		#ballx velocity	
	canvas.data.dy = 4		#bally velocity
	canvas.data.colorList = ["blue","red","orange","green","purple","yellow"]
	canvas.data.count = 0

def drawball():
	while True:
		canvas.create_text(150, 100, text="Taste The Rainbow!", fill="purple", font="Helvetica 26 bold underline")
		canvas.create_oval(canvas.data.x0,canvas.data.y0,canvas.data.x1,canvas.data.y1,fill=canvas.data.colorList[canvas.data.count])
		canvas.after(20)
		canvas.data.x0+=canvas.data.dx
		canvas.data.y0+=canvas.data.dy
		canvas.data.x1+=canvas.data.dx
		canvas.data.y1+=canvas.data.dy
		collisionCheck()
		canvas.update()
		redrawAll()
		
    	
# the next function tests for collision between the ball and the wall and reverses the proper velocity.
def collisionCheck():
	if canvas.data.x1 >= 400:
		canvas.data.dx *= -1
		canvas.data.count +=1
		canvas.data.count = canvas.data.count % 6
	if canvas.data.y1 >= 300:
		canvas.data.dy *= -1
		canvas.data.count +=1
		canvas.data.count = canvas.data.count % 6
	if canvas.data.x0 <= 0:
		canvas.data.dx *= -1
		canvas.data.count +=1
		canvas.data.count = canvas.data.count % 6
	if canvas.data.y0 <= 0:
		canvas.data.dy *= -1
		canvas.data.count +=1
		canvas.data.count = canvas.data.count % 6
	canvas.data.x0 += canvas.data.dx
	canvas.data.x1 += canvas.data.dx
	canvas.data.y0 += canvas.data.dy
	canvas.data.y1 += canvas.data.dy

def redrawAll():
	canvas.delete(ALL)

run()