In this article, we will learn how to draw lines using the keyboard (arrow keys) in the turtle graphics. Let’s first discuss some methods used in the implementation below:
- wn.listen(): Using this then we can give keyboard inputs
- wn.onkeypress(func, “key”): This function is used to bind fun to the key-release event of the key. In order to be able to register key-events, TurtleScreen must have focus.
- setx(position): This method is used to set the turtle’s second coordinate to x, leaving the first coordinate unchanged Here, whatever the position of the turtle is, it set the x coordinate to the given input keeping the y coordinate unchanged.
- sety(position): This method is used to set the turtle’s second coordinate to y, leaving the first coordinate unchanged Here, whatever the position of the turtle is, it set the y coordinate to the given input keeping the x coordinate unchanged.
- ycor(): This function is used to return the turtle’s y coordinate of the current position of the turtle. It doesn’t require any argument.
- xcor(): This function is used to return the turtle’s x coordinate of the current position of the turtle. It doesn’t require any argument
- head.penup: Picks the pen up so the turtle does not draw a line as it moves
- head.hideturtle: This method is used to make the turtle invisible. It’s a good idea to do this while you’re in the middle of a complicated drawing because hiding the turtle speeds up the drawing observably. This method does not require any argument.
- head.clear: This function is used to delete the turtle’s drawings from the screen
- head.write: This function is used to write text at the current turtle position.
- Import the turtle modules.
- Get a screen to draw on
- Define two instances for the turtle one is a pen and another is the head.
- Head is for telling which key is currently pressed
- Define the functions for the up, down, left, right movement of the turtle.
- In the respective up, left, right and down functions set the arrow to move 100 units in up, left, right, and down directions respectively by changing the x and y coordinates.
- Use function listen() for giving keyboard inputs.
- Use onkeypress in order to register key-events.
Below is the Python implementation of the above approach:
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