/**
+ * Adds support for the <code>curve</code> property for the <code>to</code>
+ * attribute. A curve is zero or more control points and an end point.
+ * @module anim
+ * @submodule anim-curve
+ */
+
+Y.Anim.behaviors.curve = {
+ set: function(anim, att, from, to, elapsed, duration, fn) {
+ from = from.slice.call(from);
+ to = to.slice.call(to);
+ var t = fn(elapsed, 0, 100, duration) / 100;
+ to.unshift(from);
+ anim._node.setXY(Y.Anim.getBezier(to, t));
+ },
+
+ get: function(anim, att) {
+ return anim._node.getXY();
+ }
+};
+
+/**
+ * Get the current position of the animated element based on t.
+ * Each point is an array of "x" and "y" values (0 = x, 1 = y)
+ * At least 2 points are required (start and end).
+ * First point is start. Last point is end.
+ * Additional control points are optional.
+ * @for Anim
+ * @method getBezier
+ * @static
+ * @param {Array} points An array containing Bezier points
+ * @param {Number} t A number between 0 and 1 which is the basis for determining current position
+ * @return {Array} An array containing int x and y member data
+ */
+Y.Anim.getBezier = function(points, t) {
+ var n = points.length;
+ var tmp = [];
+
+ for (var i = 0; i < n; ++i){
+ tmp[i] = [points[i][0], points[i][1]]; // save input
+ }
+
+ for (var j = 1; j < n; ++j) {
+ for (i = 0; i < n - j; ++i) {
+ tmp[i][0] = (1 - t) * tmp[i][0] + t * tmp[parseInt(i + 1, 10)][0];
+ tmp[i][1] = (1 - t) * tmp[i][1] + t * tmp[parseInt(i + 1, 10)][1];
+ }
+ }
+
+ return [ tmp[0][0], tmp[0][1] ];
+
+};
+