#----------------------------------------------------------------------
# Sierpinski Gasket fractal
#
# Copyright (C) October 4, 2017 -- Dr. William T. Verts
#
# How can the code be improved?
#----------------------------------------------------------------------

import random    # I forgot to include this in the program in class

def Main():
    Canvas = makeEmptyPicture(1000,700)
    show(Canvas)
    P0X = getWidth(Canvas) / 2    # P0 fixed on top row, center
    P0Y = 0
    P1X = 0                       # P1 fixed at lower left corner
    P1Y = getHeight(Canvas) - 1
    P2X = getWidth(Canvas) - 1    # P2 fixed at lower right corner
    P2Y = getHeight(Canvas) - 1
    PX  = P0X                     # P allowed to move around
    PY  = P0Y
    Count = 0
    
    while (True):
        N = random.randrange(3)
        if (N == 0):
            PX = (PX + P0X) / 2
            PY = (PY + P0Y) / 2
            C  = red
        elif (N == 1):
            PX = (PX + P1X) / 2
            PY = (PY + P1Y) / 2
            C  = green
        else:
            PX = (PX + P2X) / 2
            PY = (PY + P2Y) / 2
            C  = blue
            
        PIX = getPixel(Canvas,PX,PY)
        setColor(PIX,C)
        Count = Count + 1
        if Count == 10000:
            repaint(Canvas)
            Count = 0
    
    return