# HG changeset patch
# User Simon Cross <hodgestar@gmail.com>
# Date 1301858734 -7200
# Node ID 8efb35009ba0ad572a5efa47b4c6a55575ed4d93
# Parent  7d411ed02eac09caa946d65e35e982959bc4129f
Switch to dirty sprites and layered dirty rendering groups in the hopes that it will provide access to speed-ups later on.

diff -r 7d411ed02eac -r 8efb35009ba0 skaapsteker/physics.py
--- a/skaapsteker/physics.py	Sun Apr 03 21:18:31 2011 +0200
+++ b/skaapsteker/physics.py	Sun Apr 03 21:25:34 2011 +0200
@@ -8,7 +8,7 @@
 import time
 
 
-class Sprite(pygame.sprite.Sprite):
+class Sprite(pygame.sprite.DirtySprite):
 
     mobile = True # whether the velocity may be non-zero
     gravitates = True # whether gravity applies to the sprite
@@ -21,6 +21,9 @@
         self.rect = pygame.Rect(0, 0, 10, 10) # sub-classes should override
         self.image = pygame.Surface((10, 10))
         self.image.fill((0, 0, 200))
+        self.visible = 1
+        self.dirty = 1
+        self.blendmode = 0
 
     def deltav(self, dv):
         v_x, v_y = self.velocity
@@ -43,7 +46,7 @@
     GRAVITY = 9.8 # m/s^2
 
     def __init__(self):
-        self._all = pygame.sprite.Group()
+        self._all = pygame.sprite.LayeredDirty()
         self._mobiles = pygame.sprite.Group()
         self._gravitators = pygame.sprite.Group()
         self._last_time = None