Created the Actor and Animation classes.

actor.py

@@ -0,0 +1,20 @@
+###########################################
+# Created on 1-9-2013. Miguel Angel Astor #
+###########################################
+import pygame
+from animation import Animation
+
+class Actor:
+    """ Represents any game object. """
+    def __init__(self):
+        """ Initializes the actor object. """
+        # All sprites for an actor are stored as a list of pygame sprites.
+        self.sprites = []
+        # Animations are stored as a key (animation name),
+        # value (list of sprite indices) pairs.
+        self.animations = {}
+        # Parameters.
+        self.angle = 0
+        self.speed = [0, 0] # [X speed, Y speed].
+        self.acceleration = [0, 0] # Ditto.
+        self.b_box = [0, 0] # [X length, Y length].

animation.py

@@ -0,0 +1,55 @@
+###########################################
+# Created on 1-9-2013. Miguel Angel Astor #
+###########################################
+
+class Animation:
+    """ This class represents an animated sprite. No sprite information is
+        stored in this class, only sprite indexes. """
+    def __init__(self, name):
+        """ Initializes an empty animation. """
+        self.fps = 0
+        self.name = name
+        self.looping = False
+        self.current_frame = 0
+        self.frames = []
+
+    def __str__(self):
+        """ Returns a string representation of this animation. """
+        return "Animation :: Name: " + self.name + " :: FPS: " + str(self.fps) +
+               " :: Looping : " + str(self.looping) + " :: Current frame: " +
+               str(self.current_frame)
+
+    def add_frame(self, frame):
+        """ Adds a frame to this animation. Frames should be added in order. """
+        self.frames.append(frame)
+
+    def get_next_frame(self):
+        """ Returns the current frame of the animation. Moves the current frame
+            count by one. """
+        if(self.looping):
+            self.current_frame = (self.current_frame + 1) % len(self.frames)
+        elif (self.current_frame == len(self.frames) - 1):
+            pass
+        return self.frames[self.current_frame]
+
+    def get_current_frame(self):
+        """ Returns the current frame of the animation. """
+        return self.current_frame
+
+    def set_current_frame(self, frame):
+        """ Changes the current frame of the animation. """
+        # The frame is wrapped modulo the number of frames to ensure it is valid.
+        self.current_frame = frame % len(self.frames)
+
+    def get_looping(self):
+        """ Returns wether this animation should loop or not. """
+        return self.looping
+
+    def set_looping(self, looping):
+        self.looping = looping
+
+    def get_frames_per_second(self):
+        return self.fps
+
+    def set_frames_per_second(self, fps):
+        self.fps = fps

intro.py

@@ -1,5 +1,6 @@
-# Miguel Angel Astor Romero. Created on 7-1-2013. #
+###########################################
-###################################################
+# Created on 1-7-2013. Miguel Angel Astor #
+###########################################
 import pygame
 
 try:

main.py

@@ -1,3 +1,4 @@
+#! /usr/bin/env python
 ###########################################
 # Created on 1-7-2013. Miguel Angel Astor #
 ###########################################