@@ -363,6 +363,9 @@ class Element(CompoundShape):

     def __init__(self, shapes):

         CompoundShape.__init__(self, shapes)

+    def is_inside(self, x, y):

+        return False

+

     def get_url(self, x, y):

         return None

@@ -421,10 +424,23 @@ class Edge(Element):

     RADIUS = 10

+    def is_inside_begin(self, x, y):

+        return square_distance(x, y, *self.points[0]) <= self.RADIUS*self.RADIUS

+

+    def is_inside_end(self, x, y):

+        return square_distance(x, y, *self.points[-1]) <= self.RADIUS*self.RADIUS

+

+    def is_inside(self, x, y):

+        if self.is_inside_begin(x, y):

+            return True

+        if self.is_inside_end(x, y):

+            return True

+        return False

+

     def get_jump(self, x, y):

-        if square_distance(x, y, *self.points[0]) <= self.RADIUS*self.RADIUS:

+        if self.is_inside_begin(x, y):

             return Jump(self, self.dst.x, self.dst.y, highlight=set([self, self.dst]))

-        if square_distance(x, y, *self.points[-1]) <= self.RADIUS*self.RADIUS:

+        if self.is_inside_end(x, y):

             return Jump(self, self.src.x, self.src.y, highlight=set([self, self.src]))

         return None