sierpinski.py

import turtle

def drawing_triangle(points, color, my_turtle):
	my_turtle.fillcolor(color)
	my_turtle.up()
	my_turtle.goto(points[0][0],points[0][1])
	my_turtle.down()
	my_turtle.begin_fill()
	my_turtle.goto(points[1][0],points[1][1])
	my_turtle.goto(points[2][0],points[2][1])
	my_turtle.goto(points[0][0],points[0][1])
	my_turtle.end_fill()


def  get_mid(p1, p2):
	return ((p1[0] + p2[0]) / 2, (p1[1] + p2[1]) / 2)

def sierpinski(points, degree, my_turtle):
	color_map = ['blue','red','yellow','violet', 'green', 'orange']

	drawing_triangle(points, color_map[degree], my_turtle)
	if degree > 0:
		sierpinski([points[0], get_mid(points[0], points[1]),get_mid(points[1], points[1])], degree-1, my_turtle)
		sierpinski([points[1], get_mid(points[0], points[1]),get_mid(points[1], points[2])], degree-1, my_turtle)
		sierpinski([points[2], get_mid(points[2], points[1]),get_mid(points[0], points[2])], degree-1, my_turtle)

def main():
			my_turtle = turtle.Turtle()
			my_win = turtle.Screen()
			my_points = [[-100, -50], [0, 100], [100, -50]]
			sierpinski(my_points, 3, my_turtle)
			my_win.exitonclick()

main()