from SimpleGraphics import *
from random import randrange

# Draw a fractal T-square
# Parameters:
#   x, y: the upper left corner of the region
#   w: the width of the region
# Returns: (none)
def tsquare(x, y, w):
  if w >= 4:
    # Set the color based on the position where the square is drawn to get
    # a more artistic look
    setColor(x / 2, y / 2, (x + y) / 4)

    # Draw a square in the middle of the current region
    rect(x + w/4, y+w/4 ,w/2, w/2)

    # Recursively draw 4 addition tsqaures
    tsquare(x, y, w/2)              # Upper left corner
    tsquare(x + w/2, y, w/2)        # Upper right corner
    tsquare(x, y + w/2, w/2)        # Lower left corner
    tsquare(x + w/2, y + w/2, w/2)  # Lower right corner

# Set the window size so that it is a power of 2 for prettier results
resize(512, 512)

# Draw a T-square that occupies the entire window
tsquare(0, 0, 512)