don't update rect color on mouse motion. How to fix?

Question

import pygame
from pygame.locals import *

pygame.init()
screen=pygame.display.set_mode((800,600))

surf1=pygame.Surface((200,200))
surf1.fill((250,0,0))
rect1 = surf1.get_rect()
rect1.topleft = (200, 200)
screen.blit(surf1,rect1) 

pygame.display.flip()

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

pygame.display.flip() don’t work in or outside while cicle

        if ev.type==MOUSEMOTION:
            if rect1.collidepoint(ev.pos):
                surf1.fill((0, 250, 0))
                print('inside')
                pygame.display.flip()

dont work, i tried to change pygame.display.flip() indentation but nothing

pygame.quit()

Asked By: redanol

||

Source

Answer 1

You have to redraw the scene in every frame. The typical PyGame application loop has to:

limit the frames per second to limit CPU usage with pygame.time.Clock.tick
handle the events by calling either pygame.event.pump() or pygame.event.get().
update the game states and positions of objects dependent on the input events and time (respectively frames)
clear the entire display or draw the background
draw the entire scene (blit all the objects)
update the display by calling either pygame.display.update() or pygame.display.flip()

import pygame
from pygame.locals import *

pygame.init()
screen = pygame.display.set_mode((800, 600))
clock = pygame.time.Clock()

surf1 = pygame.Surface((200, 200))
surf1.fill((255, 0, 0))
rect1 = surf1.get_rect()
rect1.topleft = (200, 200)

done = False
while not done:
    # limit the frames per second to limit CPU usage
    clock.tick(100)

    # handle the events and update the game states
    for ev in pygame.event.get():  
        if ev.type == QUIT:
            done = True
        if ev.type == MOUSEMOTION:
            if rect1.collidepoint(ev.pos):
                surf1.fill((0, 255, 0))
            else:
                surf1.fill((255, 0, 0))

    # clear the entire display
    screen.fill(0)

    # blit all the objects
    screen.blit(surf1,rect1) 

    # update the display
    pygame.display.flip()

pygame.quit()

Answered By: Rabbid76

don't update rect color on mouse motion. How to fix?

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