From 8ba9d4ae100be129b255230790149f488032fa3c Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Fri, 07 Mar 2014 19:44:11 +0000
Subject: elements cleanup

---
(limited to 'elements/callbacks.py')

diff --git a/elements/callbacks.py b/elements/callbacks.py
index 01e9545..d3aae96 100644
--- a/elements/callbacks.py
+++ b/elements/callbacks.py
@@ -8,7 +8,7 @@ Home:  http://elements.linuxuser.at
 IRC:   #elements on irc.freenode.org
 
 Code:  http://www.assembla.com/wiki/show/elements
-       svn co http://svn2.assembla.com/svn/elements                     
+       svn co http://svn2.assembla.com/svn/elements
 
 License:  GPLv3 | See LICENSE for the full text
 This program is free software: you can redistribute it and/or modify
@@ -22,70 +22,78 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.              
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 from locals import *
 from elements import box2d
 
+
 class CallbackHandler:
-    # List of contact callbacks and shapes to start them - sorted by type for quicker access  
-    # Callbacks are saved as callbacks[callback_type][[function, parameters], ...]
-    callbacks = {}   
-    
+    # List of contact callbacks and shapes to start them - sorted by
+    # type for quicker access Callbacks are saved as
+    # callbacks[callback_type][[function, parameters], ...]
+    callbacks = {}
+
     def __init__(self, parent):
         self.parent = parent
-        
-        # init callback dict to avoid those slow try 
+
+        # init callback dict to avoid those slow try
         # (especially for self.get, as it is called *often*)
         for i in xrange(10):
             self.callbacks[i] = []
-         
+
     def add(self, callback_type, callback_handler, *args):
             """ Users can add callbacks for certain (or all) collisions
-               
+
                Parameters:
-                 callback_type ......... CALLBACK_CONTACT (nothing else for now)
+                 callback_type ......... CALLBACK_CONTACT
+                                         (nothing else for now)
                  callback_handler ...... a callback function
-                 args (optional) ....... a list of parameters which can be used with callbacks.get
-               
+                 args (optional) ....... a list of parameters which can be
+                                         used with callbacks.get
+
                Return:
                  callback_id ... used to remove a callback later (int)
             """
             # Create contact listener if required
-            if callback_type in [CALLBACK_CONTACT_ADD, CALLBACK_CONTACT_PERSIST, CALLBACK_CONTACT_REMOVE]:
-                if self.parent.listener == None:
+            if callback_type in [CALLBACK_CONTACT_ADD,
+                                 CALLBACK_CONTACT_PERSIST,
+                                 CALLBACK_CONTACT_REMOVE]:
+                if self.parent.listener is None:
                     self.parent.listener = kContactListener(self.get)
-                    self.parent.world.SetContactListener( self.parent.listener )
+                    self.parent.world.SetContactListener(self.parent.listener)
                     print "* ContactListener added"
-            
+
             # Get callback dict for this callback_type
             c = self.callbacks[callback_type]
-                        
+
             # Append to the Callback Dictionary
             c.append([callback_handler, args])
             self.callbacks[callback_type] = c
-            
+
             # Return Callback ID
             # ID = callback_type.callback_index (1...n)
             return "%i.%i" % (callback_type, len(c))
-        
+
     def get(self, callback_type):
         return self.callbacks[callback_type]
-            
+
     def start(self, callback_type, *args):
         callbacks = self.get(callback_type)
         for c in callbacks:
             callback, params = c
             callback()
 
+
 class kContactListener(box2d.b2ContactListener):
-    def __init__(self, get_callbacks): 
+
+    def __init__(self, get_callbacks):
         # Init the Box2D b2ContactListener
         box2d.b2ContactListener.__init__(self)
 
         # Function to get the current callbacks
         self.get_callbacks = get_callbacks
-        
+
     def check_contact(self, contact_type, point):
         # Checks if a callback should be started with this contact point
         contacts = self.get_callbacks(contact_type)
@@ -94,9 +102,9 @@ class kContactListener(box2d.b2ContactListener):
         for c in contacts:
             callback, bodylist = c
             if len(bodylist) == 0:
-                # Without bodylist it's a universal callback (for all bodies) 
+                # Without bodylist it's a universal callback (for all bodies)
                 callback(point)
-                
+
             else:
                 # This is a callback with specified bodies
                 # See if this contact involves one of the specified
@@ -104,19 +112,18 @@ class kContactListener(box2d.b2ContactListener):
                 b2 = str(point.shape2.GetBody())
                 for s in bodylist:
                     s = str(s)
-                    if b1 == s or b2 == s: 
+                    if b1 == s or b2 == s:
                         # Yes, that's the one :)
                         callback(point)
-         
+
     def Add(self, point):
         """Called when a contact point is created"""
         self.check_contact(CALLBACK_CONTACT_ADD, point)
-        
+
     def Persist(self, point):
         """Called when a contact point persists for more than a time step"""
         self.check_contact(CALLBACK_CONTACT_PERSIST, point)
-                        
+
     def Remove(self, point):
         """Called when a contact point is removed"""
         self.check_contact(CALLBACK_CONTACT_REMOVE, point)
-        
--
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