+Points
+Hit::points(Distance height)
+{
+ /* draw a diamond */
+
+ Points p;
+
+ const double half_height = height/2.0;
+ p.push_back (Duple (-half_height, 0)); // left, middle
+ p.push_back (Duple (0, -half_height)); // top
+ p.push_back (Duple (+half_height, 0)); // right, middle
+ p.push_back (Duple (0, +half_height)); // bottom
+
+ return p;
+}
+