diff --git a/src/gui.py b/src/gui.py
--- a/src/gui.py
+++ b/src/gui.py
@@ -2,18 +2,7 @@
 from PIL import ImageTk
 import PIL
 import math
-
-
-class EPoint:
-  def __init__(self,x,y):
-    self.x=x
-    self.y=y
-  
-  def dist(self,a):
-    return math.sqrt((self.x-a.x)**2+(self.y-a.y)**2)
-    
-  def __str__(self): return "({0},{1})".format(self.x,self.y)
-  def __repr__(self): return "EPoint({0},{1})".format(self.x,self.y)
+from epoint import *
 
 
 class Application(tk.Frame):
@@ -39,7 +28,8 @@ class Application(tk.Frame):
     # board with detected stones
     self.boardView=BoardView(self)
     self.boardView.grid(column=1,row=0)
-    
+  
+  ## Stores a grid corner located at x,y coordinates.
   def addCorner(self,x,y):
     a=EPoint(x,y)
     for i,c in enumerate(self.corners): # move an improperly placed point
@@ -66,6 +56,7 @@ class Application(tk.Frame):
     
     self.redrawImgView()
     
+  ## Redraws the current image and its overlay.
   def redrawImgView(self):
     self.imgView.create_image(2,2,anchor="nw",image=self.img)
     for corner in self.corners:
@@ -73,6 +64,7 @@ class Application(tk.Frame):
     
     self.imgView.grid()
     
+  ## Marks a point at the image with a green cross. Used for corners.
   def markPoint(self,x,y):
     self.imgView.create_line(x-3,y-3,x+4,y+4,fill="#00ff00")
     self.imgView.create_line(x-3,y+3,x+4,y-4,fill="#00ff00")
@@ -80,6 +72,7 @@ class Application(tk.Frame):
     self.imgView.grid()
 
 
+## Handles and presents the game state as detected by the program.   
 class BoardView(tk.Canvas):
   def __init__(self, master=None):
     tk.Canvas.__init__(self, master)