CODEWITHSUNDEEP
pythonturtle-graphicspython-turtle
SRobertJames
SRobertJames

Reputation: 9263

Python 3 Turtle: How to enable wrap around

Turtle and Logo is a great way to explore programming. Python 3 includes a great turtle module.

Unfortunately, the Python 3 turtle doesn't seem to support wrap around. If the turtle goes off the screen, it stays there, instead of coming to other side. This can be very frustrating for kids who can't figure out how to bring it back.

Is there a way or work around to get wrap around in Python 3 turtle?

Upvotes: 1

Views: 681

Answers (1)

cdlane
cdlane

Reputation: 41905

Is there a way or work around to get wrap around in Python 3 turtle?

Yes, you can implement it! And at the same time demonstrate to the kids the power of object-oriented programing! A simple-minded example:

from turtle import Screen, Turtle, _CFG

class WrappedTurtle(Turtle):
    def __init__(self, shape=_CFG['shape'], undobuffersize=_CFG['undobuffersize'], visible=_CFG['visible']):
        super().__init__(shape=shape, undobuffersize=undobuffersize, visible=visible)

    def forward(self, distance):
        super().forward(distance)

        screen = self.getscreen()

        x_flag = abs(self.xcor()) > screen.window_width()/2
        y_flag = abs(self.ycor()) > screen.window_height()/2

        if x_flag or y_flag:
            down = self.isdown()

            if down:
                self.penup()

            x, y = self.position()

            self.hideturtle()
            self.setposition(-x if x_flag else x, -y if y_flag else y)
            self.showturtle()

            if down:
                self.pendown()


if __name__ == '__main__':
    screen = Screen()

    yertle = WrappedTurtle('turtle')
    yertle.speed('fastest')
    yertle.left(31)

    while True:
        yertle.forward(2)

    screen.mainloop()  # never reached

enter image description here

Upvotes: 2

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