Make Drawable (and children) conform to geometric points standard.

For #30.

components/drawable.py

@@ -10,11 +10,14 @@ class Drawable(object):
     or `draw_unchanging`.
     """
 
-    def __init__(self, draw_offset, height_limit=None, width_limit=None):
+    def __init__(self, draw_offset, width_limit=None, height_limit=None):
         """
         draw_offset is a (width, height) tuple.
         """
         self.draw_offset = draw_offset if draw_offset else (0, 0)
+        # TODO Make the semantics like so: if width_limit is None, make it scale
+        # along the screen's width; if height_limit is None, make it scale along
+        # the screen's height.
         self.max_size = (width_limit, height_limit) if width_limit and height_limit else None
 
     def draw(self, window, screen, **kwargs):

components/helpers/grid.py

@@ -30,8 +30,8 @@ class Grid(Drawable):
     A grid must be drawable (and traversable)!
     """
 
-    def __init__(self, draw_width=-1, draw_height=-1, draw_offset=None):
-        super(Grid, self).__init__(draw_offset)
+    def __init__(self, draw_offset=None, width_limit=None, height_limit=None):
+        super(Grid, self).__init__(draw_offset, width_limit, height_limit)
 
     def traverse(self):
         """

components/shapes.py

@@ -34,7 +34,7 @@ class PointShape(Drawable):
     @author Chad Estioco
     """
 
-    def __init__(self, point_list = None, line_color = Colors.MAX_BLACK, draw_offset=None):
+    def __init__(self, point_list=None, line_color=Colors.MAX_BLACK, draw_offset=None):
         """
         Create a PointShape with the given point_list.
         """