Dual lattice: Difference between revisions

Revision as of 15:06, 16 June 2016

@@ Line 8: / Line 8: @@
 w1 = brd.create('arrow', [[0,0], function() {
-     return [-1,-1];
+     var num = b1.X() * b2.Y() - b2.X() * b1.Y();
-}], {});
+    return [b2.Y() / num,  -b2.X() / num];
+}], {strokeColor: 'red'});