--- a/mhrok/display.py	Sat Mar 10 16:29:36 2012 +0100
+++ b/mhrok/display.py	Sat Mar 10 18:10:11 2012 +0100
@@ -6,10 +6,13 @@
     import cStringIO as StringIO
 except ImportError:
     import StringIO
+import random
 
 import pygame
 from pygame import locals as pg
 
+from mhrok import sprites
+
 
 class SortedUpdates(pygame.sprite.RenderUpdates):
     """Sprite group with a depth for controlling drawing order."""
@@ -80,6 +83,13 @@
             event = events.pop()
             getattr(self, 'on_%s' % event[0])(*event[1:])
 
+    def on_mob_dust(self, mob, amount=4, delay=0):
+        for i in xrange(amount):
+            x = mob.sprite.rect.centerx + random.randint(-8, 8)
+            y = mob.sprite.rect.centery + random.randint(-2, 2)
+            self.sprites.add(sprites.Dust(
+                self.tiles, (x, y), delay + random.randint(0, 4)))
+
     def on_room_light(self, room):
         self.light_room(room)
 

--- a/mhrok/level.py	Sat Mar 10 16:29:36 2012 +0100
+++ b/mhrok/level.py	Sat Mar 10 18:10:11 2012 +0100
@@ -63,11 +63,14 @@
     def open(self, mob):
         self.mobs.remove(mob)
         self.events.append(('mob_open', mob))
+        self.events.append(('mob_dust', mob, 20, 4))
 
-    def stand(self, mob, direction):
+    def stand(self, mob, direction, dust=False):
         if direction is None:
             return
         self.events.append(('mob_stand', mob, direction))
+        if dust:
+            self.events.append(('mob_dust', mob, 4))
 
     def wait(self, mob, direction):
         self.events.append(('mob_wait', mob, direction))
@@ -75,6 +78,7 @@
     def attack(self, mob, direction, other):
         other.hit(self, mob)
         self.events.append(('mob_attack', mob, direction, other))
+        self.events.append(('mob_dust', mob, 4))
 
     def is_blocked(self, pos):
         for m in self.mobs:

Binary file mhrok/mhrok.png has changed

--- a/mhrok/mobs.py	Sat Mar 10 16:29:36 2012 +0100
+++ b/mhrok/mobs.py	Sat Mar 10 18:10:11 2012 +0100
@@ -127,7 +127,7 @@
             except level.BlockedMob as e:
                 level.attack(self, self.direction, e.mob)
             except level.BlockedWall:
-                level.stand(self, self.direction)
+                level.stand(self, self.direction, dust=True)
                 return False
         else:
             level.stand(self, self.direction)

--- a/mhrok/sprites.py	Sat Mar 10 16:29:36 2012 +0100
+++ b/mhrok/sprites.py	Sat Mar 10 18:10:11 2012 +0100
@@ -177,4 +177,30 @@
             self.set_radius(min(self.current_radius + 4, self.radius))
         self.rect.center = self.owner.rect.center
 
+class Dust(pygame.sprite.Sprite):
 
+    def __init__(self, frames, (x, y), delay=0):
+        super(Dust, self).__init__()
+        self.animation = self.dust_animation(frames, delay)
+        self.image = frames[40].copy()
+        self.image.set_alpha(0)
+        self.rect = self.image.get_rect()
+        self.rect.center = (x, y)
+        self.depth = y
+        for step, frame in enumerate([40, 41, 42, 43]):
+            frames[frame].set_alpha(192 - 32 * step)
+
+    def dust_animation(self, frames, delay):
+        for step in xrange(delay):
+            yield None
+        for frame in [40, 41, 42, 43]:
+            self.image = frames[frame]
+            yield None
+            yield None
+            yield None
+
+    def update(self):
+        try:
+            self.animation.next()
+        except StopIteration:
+            self.kill()