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import turtle
import random
## Global Variable Part ##
swidth, sheight, pSize = 500, 500, 3
r, g, b, angle, dist, = 0, 0, 0, 30, 5 # Set the angle to 30 degrees

## Main function part ##
turtle.title ('drawing a conch with a turtle')
turtle.shape('turtle')
turtle.pensize(pSize)
turtle.setup(width = swidth + 30, height = sheight + 30)
turtle.screensize(swidth, sheight)

for i in range(80) :
    if i % 8 == 1:
        turtle.pencolor("red")
    elif i % 8 == 2:
        turtle.pencolor("orange")
    elif i % 8 == 3:
        turtle.pencolor("yellow")
    elif i % 8 == 4:
        turtle.pencolor("green")
    elif i % 8 == 5:
        turtle.pencolor("blue")
    elif i % 8 == 6:
        turtle.pencolor("navy")     
    elif i % 8 == 7:
        turtle.pencolor("purple")
    elif i % 8 == 0:
        turtle.pencolor("black")

    dist + = 1 # Increase the length of the line you draw by 1
    turtle.forward(dist)
    turtle.left(angle) # 30 degrees to the left

turtle.done()