Agfdhyk

How do I stop a randomly moving turtle using a while loop when it comes with 50 units of another turtle?

I have one turtle that randomly selects a location and creates a large dot or hole, and another turtle that moves around randomly making 90 degree turns and moving forward 50 units every time. The randomly moving turtle stops when it goes off of the end of the screen, but how do I also make the turtle stop when it gets to the hole created by the other turtle?

import random

import turtle



def turtlesClose(t1, t2):

    if t1.distance(t2)<50:

        return True

    else:

        return False



def isInScreen(win,turt):

    leftBound = -win.window_width() / 2

    rightBound = win.window_width() / 2

    topBound = win.window_height() / 2

    bottomBound = -win.window_height() / 2



    turtleX = turt.xcor()

    turtleY = turt.ycor()



    stillIn = True

    if turtleX > rightBound or turtleX < leftBound:

        stillIn = False

    if turtleY > topBound or turtleY < bottomBound:

        stillIn = False

    return stillIn



def main():

    wn = turtle.Screen()

    # Define your turtles here

    june = turtle.Turtle()

    july = turtle.Turtle()



    july.shape('turtle')

    july.up()

    july.goto(random.randrange(-250, 250, 1), random.randrange(-250, 250, 1))

    july.down()

    july.dot(100)



    june.shape('turtle')

    while isInScreen(wn,june):

        coin = random.randrange(0, 2)

        dist = turtlesClose(july, june)

        if coin == 0:

            june.left(90)

        else:

            june.right(90)

        june.forward(50)



        if dist == 'True':

            break



main()

The problem with your code is this statement:

if dist == 'True':

You don't want quotes around True. Although this will work:

if dist == True:

The correct way to express this is:

if dist is True:

or better yet:

if dist:

Otherwise your code seems to work. Below's a rewrite taking advantage of some turtle idioms and other code cleanup:

from random import randrange, choice

from turtle import Screen, Turtle



CURSOR_SIZE = 20



def turtlesClose(t1, t2):

    return t1.distance(t2) < 50



def isInScreen(window, turtle):

    leftBound = -window.window_width() / 2

    rightBound = window.window_width() / 2

    topBound = window.window_height() / 2

    bottomBound = -window.window_height() / 2



    turtleX, turtleY = turtle.position()



    return leftBound < turtleX < rightBound and bottomBound < turtleY < topBound



def main():

    screen = Screen()



    july = Turtle('circle')

    july.shapesize(100 / CURSOR_SIZE)



    july.up()

    july.goto(randrange(-250, 250), randrange(-250, 250))

    july.down()



    june = Turtle('turtle')



    while isInScreen(screen, june):



        if turtlesClose(july, june):

            break



        turn = choice([june.left, june.right])



        turn(90)



        june.forward(50)



main()