How to draw an asterisk square using Python's turtle library?

Use Python's turtle library to draw asterisk squares to achieve unique visual effects. It is not easy to draw asterisks directly using the turtle library, because the turtle library is mainly used for graphic drawing rather than text output. This article provides a clever solution to use the write() function of the turtle library to implement the drawing of asterisk squares.

Previous attempts may have used turtle.shape('*') , but this changes the shape of the turtle instead of drawing an asterisk on the canvas.

The improved method is as follows: by looping to call the write('*') function, output asterisks at certain intervals on the four sides of the square, thereby simulating an asterisk square.

Improved code example:

 import turtle

turtle.shape('classic') # Use the classic turtle shape turtle.speed(10) # Set drawing speed turtle.penup() # Lift the pen to avoid drawing unnecessary lines turtle.setpos(0, 0) # Set the starting position def make_square(left_bottom, right_top, size=10):
    """
    Draw an asterisk square.

    Args:
        left_bottom: The lower left corner coordinate (x, y) of the square.
        right_top: The upper right corner coordinate (x, y) of the square.
        size: the size of the asterisk.
    """
    x1, y1 = left_bottom
    x2, y2 = right_top

    if x1 > x2 or y1 > y2:
        raise ValueError("Coordinate parameter error: The lower left corner coordinate must be smaller than the upper right corner coordinate.")

    # Draw the bottom edge turtle.goto(x1, y1)
    turtle.pendown()
    for i in range(int((x2 - x1) / size)):
        turtle.write("*", font=("Arial", size, "normal"))
        turtle.forward(size)
    turtle.penup()

    # Draw the right side turtle.goto(x2, y1)
    turtle.pendown()
    for i in range(int((y2 - y1) / size)):
        turtle.write("*", font=("Arial", size, "normal"))
        turtle.forward(size)
    turtle.penup()

    # Draw the top edge turtle.goto(x2, y2)
    turtle.pendown()
    for i in range(int((x2 - x1) / size)):
        turtle.write("*", font=("Arial", size, "normal"))
        turtle.backward(size)
    turtle.penup()

    # Draw the left side turtle.goto(x1, y2)
    turtle.pendown()
    for i in range(int((y2 - y1) / size)):
        turtle.write("*", font=("Arial", size, "normal"))
        turtle.backward(size)
    turtle.penup()


# Example usage: Draw a square with a side length of 100 pixels and an asterisk size of 10 make_square((-50, -50), (50, 50), 10)

turtle.done()

This code adds clearer comments and error handling to ensure that input coordinates are valid and more precisely controls the spacing and size of asterisks. font parameter controls the size of the asterisk. Use penup() and pendown() methods to avoid drawing unnecessary lines and make the graphics clearer.

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