[pygame] Sprite Surface very slow to draw

[SurferIX <olivier.pons@xxxxxxxxx>]

Hi!

I've got a problem. Maybe this is normal, and there's a workaround,
but I don't get why it is so slow :
- I have a background that I draw on the whole screen to erase it
(pure & simple copy, this is *very* quick (at least quick enough for
me)
- if the mouse is in a certain area, I just want to create a Sprite
"green square" around this area and keep it like this as long as the
mouse is in this area. Once the mouse gets out of this Rect, I want
this sprite to fade to black then remove it.

I based my code on the chimp.py (see google) example (which is a very
good example to me).

The problem is that the "highlight sprite" is very, very, very, very,
very, very slow to be drawn.
Am I missing something?
So here is my code :

  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3
  4 import os, pygame, sys, time, random, copy, pprint
  5 from pygame.locals import *
  6
  7 class SMouse(pygame.sprite.Sprite):
  8     def __init__(self,width,height):
  9         pygame.sprite.Sprite.__init__(self) #call Sprite
initializer
 10         self.width = width
 11         self.height = height
 12         self.rect  = pygame.Rect(0, 0, width, height)
 13         self.image = pygame.Surface( (self.rect.width,
self.rect.height) )
 14         self.image.set_colorkey((0,0,0))
 15         self.image.fill((0, 0, 0))
 16         pygame.draw.rect(self.image, (205,250,130), self.rect, 5)
 17         self.image = self.image.convert()
 18
 19     def update(self):
 20         self.rect.topleft = pygame.mouse.get_pos()
 21
 22 class Contour(pygame.sprite.Sprite):
 23     def __init__(self,width,height,speed):
 24         pygame.sprite.Sprite.__init__(self) #call Sprite
initializer
 25         self.width = width
 26         self.height = height
 27         self.rect  = pygame.Rect(0, 0, width, height)
 28         self.image = pygame.Surface( (self.rect.width,
self.rect.height) )
 29         self.image.set_colorkey((0,0,0))
 30         self.image.fill((0, 0, 0))
 31         pygame.draw.rect(self.image, (105,250,230), self.rect, 5)
 32         self.image = self.image.convert()
 33         self.fadeout = False
 34         if speed<1:
 35             raise Exception("Speed must be > 0")
 36         self.speed = speed
 37         self.alpha = 255
 38         self.done = False
 39         self.image.convert_alpha()
 40
 41     def update(self):
 42         if not self.fadeout:
 43             if not
self.rect.collidepoint( pygame.mouse.get_pos() ):
 44                 self.fadeout = True
 45         else:
 46             self.alpha -= self.speed
 47             if self.alpha<0:
 48                 self.alpha = 0
 49                 self.done = True
 50             self.image.set_alpha(self.alpha)
 51
 52 def main():
 53     pygame.init()
 54     pygame.mouse.set_visible(0)
 55     screen = pygame.display.set_mode( (0,0),
 56         pygame.FULLSCREEN | pygame.DOUBLEBUF | pygame.HWSURFACE )
 57     if pygame.display.Info().bitsize < 24:
 58         print "This game needs a 24 bits display"
 59         pygame.quit()
 60
 61     background = pygame.Surface(screen.get_size())
 62     background = background.convert()
 63     background.fill((0, 0, 0))
 64     screen.blit(background, (0, 0))
 65     pygame.display.flip()
 66     clock = pygame.time.Clock()
 67     c = Contour(500, 500, 15)
 68     c.rect.center = pygame.mouse.get_pos()
 69     group_sprites = pygame.sprite.RenderPlain( [ SMouse(50, 50),
c ] )
 70
 71     going = True
 72     while going:
 73         clock.tick(60)
 74         for event in pygame.event.get():
 75             if event.type == QUIT:
 76                 going = False
 77             elif event.type == KEYDOWN:
 78                 if event.key == K_ESCAPE:
 79                     going = False
 80                 elif event.key == K_q:
 81                     going = False
 82                 elif event.key == K_RETURN:
 83                     going = False
 84
 85         group_sprites.update()
 86         screen.blit(background, (0, 0))
 87         group_sprites.draw(screen)
 88         for sprite in group_sprites:
 89             if isinstance(sprite, Contour):
 90                 if sprite.done:
 91                     group_sprites.remove(sprite)
 92         pygame.display.flip()
 93
 94 if __name__ == '__main__':
 95     main()

The problem is that the "highlight sprite" is very, very, very, very,
very, very slow to be drawn.
Am I missing something?

Regards, Olivier Pons
You can write to me directly to olivier dot pons at gmail
Thanks!