How to move a rect together with its associated drawing (Pygame)?

Question

Minimal working example:

x = pygame.draw.circle(screen, color, (x, y), radius, width)
x.center = (my_wanted_center_x, my_wanted_center_y)

Then after updating the display, it's always displayed at its original location. Tried with other figures as well. Neither does x.move() work. How do I move any drawn figure in a simplest way?

Answer 1

You can use a pygame.Rect to store the position of your object, update the rect's attributes (for example .x or .center) in the while loop and then draw your circle or image/surface at the rect.center position.

import pygame as pg

pg.init()

screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
BG_COLOR = pg.Color('gray12')
SIENNA = pg.Color('sienna1')
radius = 20
# This rect serves as the position of the circle and
# can be used for collision detection.
rect = pg.Rect(50, 200, radius, radius)

done = False
while not done:
    for event in pg.event.get():
        if event.type == pg.QUIT:
            done = True

    rect.x += 1  # Update the position of the rect.

    screen.fill(BG_COLOR)
    # Now draw the circle at the center of the rect.
    pg.draw.circle(screen, SIENNA, rect.center, radius)
    pg.display.flip()
    clock.tick(30)

pg.quit()