diff --git a/exp/geometry.py b/exp/geometry.py
--- a/exp/geometry.py
+++ b/exp/geometry.py
@@ -28,6 +28,18 @@ class Line:
 		"""ax + by + c = 0"""
 		return (self._cos, self._sin, -self._d)
 
+	def toPoints(self):
+		(a,b,c)=self.toNormal()
+		assert a!=0 or b!=0
+		if a==0:
+			y=-c/b
+			return (EPoint(0,y),EPoint(10,y))
+		elif b==0:
+			x=-c/a
+			return (EPoint(x,0),EPoint(x,10))
+		else:
+			return (EPoint(0,-c/b),EPoint(-c/a,0))
+
 	def intersect(self,line):
 		if self._alpha==line._alpha: return None
 		(a,b,c)=self.toNormal()
@@ -51,6 +63,10 @@ class Line:
 		c_=-a*x_-b*y_
 		return Line.fromNormal(a,b,c_)
 
+	def transform(self,matrix):
+		transformed=(p.transform(matrix) for p in self.toPoints())
+		return Line.fromPoints(*transformed)
+
 	@property
 	def alpha(self): return self._alpha