pyschedelic-turtle

draw_tunnel.py

#!/usr/bin/python

import turtle, math, colorsys

def draw_tunnel(some_turtle):
    
    distance = 50.0
    n = 200
    
    for i in range(n):
        
        step = 0.09 * distance
        diag1 = math.sqrt((distance + step)**2 + step**2)
        angle1 = math.degrees(math.atan(step/(step+distance)))
        diag2 = math.sqrt((2*step)**2 + distance**2)
        angle2 = math.degrees(math.atan(2*step/distance))
        
        color = colorsys.hsv_to_rgb((1.0*i)/n, 1.0, 1.0)
        some_turtle.color(color)

        some_turtle.forward(distance)
        some_turtle.right(90)
        some_turtle.forward(distance)
        some_turtle.right(90 + angle1)
        some_turtle.forward(diag1)
        some_turtle.right(90 - angle1 + angle2)
        some_turtle.forward(diag2)
        some_turtle.right(90)
        
        distance = diag2

if __name__ == "__main__":
  
    window = turtle.Screen()
    window.bgcolor("black")
    
    timmy = turtle.Turtle()
    timmy.shape("turtle")
    timmy.color("green")
    timmy.speed(0)
    draw_tunnel(timmy)
    
    window.exitonclick()

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