added length in cw direction

helix/models/corner.py

@@ -1,12 +1,13 @@
 
 
 class Corner(object):
-    def __init__(self, x, y, length, angle):
+    def __init__(self, x, y, length_ccw, length_cw, angle):
         self.x = x
         self.y = y
-        self.length = length
+        self.length_ccw = length_ccw
+        self.length_cw = length_cw
         self.angle = angle
 
     @property
     def dictionary(self):
-        return {"x": self.x, "y": self.y, "length": self.length, "angle": self.angle}
+        return {"x": self.x, "y": self.y, "length ccw": self.length_ccw, "length cw : ": self.length_cw, "angle": self.angle}