turtle.setworldcoordinates() function in Python

turtle.setworldcoordinates() sets a custom coordinate system for the turtle graphics window. Unlike the default pixel-based system, it lets you define any range of coordinates. Calling it resets the screen, if the mode is already "world", existing drawings are redrawn to fit the new coordinates.

Syntax

turtle.setworldcoordinates(llx, lly, urx, ury)

Parameter:

• llx: (number), x-coordinate of the lower-left corner of the canvas.
• lly: (number), y-coordinate of the lower-left corner of the canvas.
• urx : (number), x-coordinate of the upper-right corner of the canvas.
• ury : (number), y-coordinate of the upper-right corner of the canvas.

Examples

Example 1: Using small world coordinates

import turtle

sc = turtle.Screen()
sc.mode('world')
turtle.setworldcoordinates(-20, -20, 20, 20)

for i in range(20):
    turtle.forward(1 + 1*i)
    turtle.right(90)

turtle.done()

Output:

Explanation: The coordinates are set between -20 and 20, so the drawing looks zoomed in and larger relative to the screen.

 Example 2: Larger world coordinates

import turtle

sc = turtle.Screen()
sc.mode('world')

# set larger world coordinates
turtle.setworldcoordinates(-40, -40, 40, 40)

for i in range(20):
    turtle.forward(1 + 1*i)
    turtle.right(90)

turtle.done()

Output :

Explanation: With coordinates expanded to -40 to 40, the same drawing appears smaller and more compact.

Example  3 : Updating world coordinates multiple times

import turtle

sc = turtle.Screen()
sc.mode('world')

# first set of coordinates
turtle.setworldcoordinates(-50, -50, 50, 50)
for i in range(16):
    turtle.forward(1 + 1*i)
    turtle.right(90)

# update coordinates
turtle.setworldcoordinates(-40, -40, 40, 40)
for i in range(16):
    turtle.forward(1 + 1*(i+16))
    turtle.right(90)

# update coordinates again
turtle.setworldcoordinates(-30, -30, 30, 30)
for i in range(16):
    turtle.forward(1 + 1*(i+32))
    turtle.right(90)

turtle.done()

Output :

Explanation: Each time the world coordinates shrink, the existing drawing is rescaled and the turtle continues, making shapes appear progressively smaller.