How to Move a Pygame Rect by a Fractional Amount?

Pygame Doesn't Allow Floats for rect.move, But I Need It?

In Pygame, the rect.move method is used to move a rectangle object by a specified number of pixels. However, this method only accepts integer values. This can be a problem when you want to move an object by a fractional amount, such as when you are simulating gravity.

There are two ways to work around this limitation. The first is to use the round() function to round the floating-point value to the nearest integer. For example, the following code will move the rectangle by 0.5 pixels in the y direction:

rect.move((0, round(0.5)))

The second way to work around this limitation is to use the set_topleft() method to set the top-left corner of the rectangle to a new position. For example, the following code will move the rectangle by 0.5 pixels in the y direction:

rect.set_topleft((rect.left, rect.top + 0.5))

Ultimately, the best method to use depends on your specific needs. If you need to move an object by a very small amount, then using the round() function is probably the best option. However, if you need to move an object by a larger amount, then using the set_topleft() method is probably the better option.

Here is an example of how you can use the round() function to move an object by a fractional amount:

import pygame

# Create a new Pygame window
window = pygame.display.set_mode((400, 300))

# Create a new rectangle object
rect = pygame.Rect(100, 100, 100, 100)

# Move the rectangle by 0.5 pixels in the y direction
rect.move((0, round(0.5)))

# Draw the rectangle to the window
pygame.draw.rect(window, (255, 0, 0), rect)

# Update the display
pygame.display.update()

# Wait for the user to close the window
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()

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