'''lecture_28_koch_lsystem.py
Draw a Koch snowflake using an L-system
Oliver W. Layton
CS 151: Computational Thinking: Visual Media
Spring 2021
'''
import turtle


def drawString(turt, string, dist, angle):
    '''Have `turt` draw the L-system string, where `turt` moves forward with a distance `dist` and
    turns at an angle `angle` degrees
    '''
    pass


def replace(string, findStr, repStr):
    '''Make a new string that applies the L-system replacement rules:
    Replace each occurence of `findStr` in `string` with `repStr`

    Returns:
    ---------
    The new string with the replacement rules applied to `string`
    '''
    pass


if __name__ == '__main__':
    # Make a screen, turn off animations so snowflake draws fast
    screen = turtle.Screen()
    screen.setup(600, 600)
    screen.tracer(False)

    # Make a turtle
    turt = turtle.Turtle()

    # Set up L-system rules

    # Set up distance and angle for Koch snowflake

    # Apply the L-system replacement rules some number of times (iterations)

    # Draw the L-system

    screen.update()
    screen.exitonclick()