diff --git a/src/analyzer/epoint.py b/src/analyzer/epoint.py
--- a/src/analyzer/epoint.py
+++ b/src/analyzer/epoint.py
@@ -1,6 +1,12 @@
 import math
 
 
+def homogenize(v):
+	for k in v:
+		if k!=0: return v/k
+	return v
+
+
 ## Euclidean 2D plane point: (x,y).
 class EPoint:
 	def __init__(self,x,y):
@@ -21,6 +27,12 @@ class EPoint:
 	def toProjective(self):
 		return (1,self._x,self._y)
 
+	def toPolar(self,center):
+		v=self-center
+		alpha=math.atan2(v.y,v.x)
+		k=self.dist(center)
+		return (alpha,k)
+
 	def dist(self,a):
 		return math.sqrt((self._x-a._x)**2+(self._y-a._y)**2)