Im making a crappy off-brand of paint in pygame.
One problem I have run into is that it is hilariously inefficient.
With only a 500 by 500 picture it runs at like 14 FPS.
The picture is stored as a list with like this:
pic = [[white,white,white],[white,white,white],[white,white,white]]
and the code that displays it is:
def display(pic):
for y in range(500):
for x in range(500):
screen.set_at((x,y),pic[y][x])
how would i make this work and be efficient.
I'm surprised you were able to get 14 FPS.
I'm sure it would be more efficient to create a PyGame Surface, then use graphic-primitive functions to modify the surface. There's a whole bunch of line and shape functions - see the pygame docs. (Note: at the time of writing, https://pygame.org has been down for a few days, so the link goes to the internet archive cache of it).
import pygame
# Window size
WINDOW_WIDTH = 500
WINDOW_HEIGHT = 500
WINDOW_SURFACE = pygame.HWSURFACE|pygame.DOUBLEBUF|pygame.RESIZABLE
DARK_BLUE = ( 3, 5, 54 )
WHITE = ( 255, 255, 255 )
### initialisation
pygame.init()
window = pygame.display.set_mode( ( WINDOW_WIDTH, WINDOW_HEIGHT ), WINDOW_SURFACE )
pygame.display.set_caption("Bad Mouse Paint")
# Drawing on
canvas = pygame.Surface( ( WINDOW_WIDTH, WINDOW_HEIGHT ) )
canvas.fill( DARK_BLUE )
### Main Loop
mouse_down = False
clock = pygame.time.Clock()
done = False
while not done:
# Handle user-input
for event in pygame.event.get():
if ( event.type == pygame.QUIT ):
done = True
elif ( event.type == pygame.MOUSEBUTTONDOWN ):
mouse_down = True
elif ( event.type == pygame.MOUSEBUTTONUP ):
mouse_down = False
# Mouse Movement
if ( mouse_down ):
mouse_pos = pygame.mouse.get_pos()
pygame.draw.circle( canvas, WHITE, mouse_pos, 5, 0 )
# Update the window, but not more than 60fps
window.blit( canvas, ( 0, 0 ) )
pygame.display.flip()
# Clamp FPS
clock.tick_busy_loop(60)
pygame.quit()
The example above uses the surface canvas to accumulate the drawing operations. It is written to the screen in a single blit() operations.