#Key Balls
#
#Shows myro graphics objects, as well as getting keystrokes as they happen
# by binding a callback function to the window's keyboard event handler.
#
#example released to the public domain
#Fall 2009
#
#

from myro import *
aWindow = GraphWin("Pong", 500,500)

xPos = [50,10,25,30]
yPos = [50,200,15,17 ]

xDelta = [-2,5,8,10]
yDelta = [5,3,2,1,7]


Balls = []

#this function gets called whenever any key is pressed and our graphWin has
#the focus. (Note the call to aWindow.bind_all() below which accomplishes this!
def keyFunc(event):
  global xDelta, yDelta
  print event.char
  print "reversing all balls!"
  for i in range( len(xDelta)):
      xDelta[i] = -xDelta[i]
      yDelta[i] = -yDelta[i]
      
      

  
index = 0
while index < len(xPos):
    Ball = Circle( Point(xPos[index], yPos[index]), 10)
    Ball.draw(aWindow)
    Balls.append(Ball)
    index = index + 1


    

Balls[0].setFill( color_rgb(255,0,0) )
Balls[1].setFill( color_rgb(0,255,0) )
Balls[2].setFill( color_rgb(0,0,255) )

index = 3
while index < len(xPos):
    Balls[index].setFill(    color_rgb(255,0,255)    )
    index = index + 1
    print "Coloring leftover balls!"



#Set up a binding to our GraphWindow so that the key function
# will be called whenever our window has focus and a key is pressed
aWindow.bind_all("<Key>", keyFunc) 
  


while timeRemaining(20):


    for index in range( len(xPos) ):
        
        if (0 > xPos[index]) or (500 < xPos[index]):
            xDelta[index] = - xDelta[index]
                             
        if (0 > yPos[index]) or (500 < yPos[index]):
            yDelta[index] = - yDelta[index]

        xPos[index] = xPos[index] + xDelta[index]
        yPos[index] = yPos[index] + yDelta[index]
                               
        Balls[index].move(xDelta[index], yDelta[index])

        
    wait(0.01)



print "**************************"
print "***** Time is up! ********"
print "**************************"

#End of program.