Re: [pygame] Re: using alpha for a circle

["Ian Mallett" <geometrian@xxxxxxxxx>]

There are two types of surfaces--the display surface and other
surfaces.  For practical purposes, you can't blit the display surface
to anything.  Try this (warning: psudocode...):

import pygame
from pygame.locals import *
import sys

pygame.init()

Screen = (500,500)
Surface = pygame.display.set_mode(Screen)

CircleSurface = pygame.Surface((100,100))
pygame.draw.circle(CircleSurface,(0,0,255),(50,50),50,5)
CircleSurface.set_colorkey((0,0,0))
CircleSurface.set_alpha(int(round(0.4*255)))

def GetInput():
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit(); sys.exit()

def Draw():
    Surface.fill((0,0,0))
    Surface.blit(CircleSurface,(Screen[0]/2-50,Screen[1]/2-50))
    pygame.display.flip()

def main():
    while True:
        GetInput()
        Draw()
if __name__ == '__main__': main()