Reputation: 63
i have started a new project in python using pygame and for the background i want the bottom half filled with gray and the top black. i have used rect drawing in projects before but for some reason it seems to be broken? i don't know what i am doing wrong. the weirdest thing is that the result is different every time i run the program. sometimes there is only a black screen and sometimes a gray rectangle covers part of the screen, but never half of the screen.
import pygame, sys
from pygame.locals import *
pygame.init()
DISPLAY=pygame.display.set_mode((800,800))
pygame.display.set_caption("thing")
pygame.draw.rect(DISPLAY, (200,200,200), pygame.Rect(0,400,800,400))
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
Upvotes: 6
Views: 2140
Reputation: 5
simply change your code to:
import pygame, sys
from pygame.locals import *
pygame.init()
DISPLAY=pygame.display.set_mode((800,800))
pygame.display.set_caption("thing")
pygame.draw.rect(DISPLAY, (200,200,200), pygame.Rect(0,400,800,400))
pygame.display.flip() #Refreshing screen
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
it should help
Upvotes: 0
Reputation: 211277
You need to update the display.
You are actually drawing on a Surface
object. If you draw on the Surface associated to the PyGame display, this is not immediately visible in the display. The changes become visibel, when the display is updated with either pygame.display.update()
or pygame.display.flip()
.
This will update the contents of the entire display.
While pygame.display.flip()
will update the contents of the entire display, pygame.display.update()
allows updating only a portion of the screen to updated, instead of the entire area. pygame.display.update()
is an optimized version of pygame.display.flip()
for software displays, but doesn't work for hardware accelerated displays.
The typical PyGame application loop has to:
pygame.event.pump()
or pygame.event.get()
.pygame.display.update()
or pygame.display.flip()
pygame.time.Clock.tick
import pygame
from pygame.locals import *
pygame.init()
DISPLAY = pygame.display.set_mode((800,800))
pygame.display.set_caption("thing")
clock = pygame.time.Clock()
run = True
while run:
# handle events
for event in pygame.event.get():
if event.type == QUIT:
run = False
# clear display
DISPLAY.fill(0)
# draw scene
pygame.draw.rect(DISPLAY, (200,200,200), pygame.Rect(0,400,800,400))
# update display
pygame.display.flip()
# limit frames per second
clock.tick(60)
pygame.quit()
exit()
repl.it/@Rabbid76/PyGame-MinimalApplicationLoop See also Event and application loop
Upvotes: 4