# HG changeset patch
# User Jeremy Thurgood <firxen@gmail.com>
# Date 1316034165 -7200
# Node ID af95fbc8ef5c32646ab92068a78ef749ffaafaea
# Parent  0dfa3f52742b0307b008dbaf53df99871ec40038
Snakes should be impermeable. So now they are.

diff -r 0dfa3f52742b -r af95fbc8ef5c mamba/snake.py
--- a/mamba/snake.py	Wed Sep 14 22:43:37 2011 +0200
+++ b/mamba/snake.py	Wed Sep 14 23:02:45 2011 +0200
@@ -24,6 +24,7 @@
         self.speed = 120.0  # pixel / s
         self.frac_ds = 0.0
         self.mutation = None
+        self.coiled = True
 
     head = property(fget=lambda self: self.segments[0])
     tail = property(fget=lambda self: self.segments[-1])
@@ -72,6 +73,7 @@
             tile_state = self.head.get_tile_state()
             shifted, ds = self.head.shift_head(ds)
             if shifted:
+                self.coiled = False
                 self.head.shifted_tile()
             else:
                 break
@@ -87,6 +89,7 @@
             if not self.check_uturn():
                 self.head.set_orientation(self.orientation)
 
+        self.check_self_crash()
         for segment in self.segments:
             segment.shift_pixels(ds)
             world.interact(segment)
@@ -106,6 +109,13 @@
     def set_orientation(self, orientation):
         self.orientation = orientation
 
+    def check_self_crash(self):
+        if self.coiled:
+            return
+        collides = spritecollide(self.head, self.segment_group, False)
+        if [s for s in collides if s not in self.segments[:2]]:
+            self.crash()
+
     def crash(self):
         SnakeDiedEvent.post()