Now only updates alpha when it has to. Much faster.

robotgame/block.py

@@ -34,12 +34,17 @@ class Block(worldobject.WorldObject):
         worldobject.WorldObject.__init__(self, level, x, y, movable=movable)
 
         self.orig_alpha = pygame.surfarray.array_alpha(self.img)
+        self.is_currently_opaque = True
 
     def update_alpha(self):
-        if (self.y + self.z >= self.level.player.y + self.level.player.z):
-            self.set_alpha(0.5)
-        else:
+        be_opaque = not (self.y + self.z >= self.level.player.y
+                         + self.level.player.z)
+        if be_opaque and not self.is_currently_opaque:
+            self.is_currently_opaque = True
             self.set_alpha(1)
+        elif not be_opaque and self.is_currently_opaque:
+            self.is_currently_opaque = False
+            self.set_alpha(0.5)
 
     def use(self, obj):
         if self.movable:
@@ -60,6 +65,7 @@ class ArrowBlock(Block):
         self.__dict__.update(locals())
         worldobject.WorldObject.__init__(self, level, x, y,
                                          direction=direction, movable=movable)
+        self.is_currently_opaque = True
 
         self.frame = 0
         self.anim_speed = 15
@@ -109,6 +115,7 @@ class RisingBlock(Block):
     def __init__(self, level, x, y, movable=False, is_up=True):
         self.__dict__.update(locals())
         worldobject.WorldObject.__init__(self, level, x, y, movable=movable)
+        self.is_currently_opaque = True
         
         self.frame = 0
         self.anim_speed = 15

robotgame/level3.py

@@ -136,9 +136,3 @@ class Level3(level.Level):
     def restart(self):
         for obj in self.objects:
             obj.reset_pos()
-
-def infrange():
-    n = 0
-    while True:
-        yield n
-        n += 1