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YUI.add('anim-curve', function (Y, NAME) {
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/**
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* Adds support for the <code>curve</code> property for the <code>to</code>
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* attribute. A curve is zero or more control points and an end point.
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* @module anim
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* @submodule anim-curve
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*/
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Y.Anim.behaviors.curve = {
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set: function(anim, att, from, to, elapsed, duration, fn) {
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from = from.slice.call(from);
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to = to.slice.call(to);
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var t = fn(elapsed, 0, 100, duration) / 100;
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to.unshift(from);
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anim._node.setXY(Y.Anim.getBezier(to, t));
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},
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get: function(anim) {
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return anim._node.getXY();
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}
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};
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/**
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* Get the current position of the animated element based on t.
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* Each point is an array of "x" and "y" values (0 = x, 1 = y)
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* At least 2 points are required (start and end).
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* First point is start. Last point is end.
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* Additional control points are optional.
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* @for Anim
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* @method getBezier
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* @static
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* @param {Number[]} points An array containing Bezier points
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* @param {Number} t A number between 0 and 1 which is the basis for determining current position
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* @return {Number[]} An array containing int x and y member data
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*/
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Y.Anim.getBezier = function(points, t) {
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var n = points.length,
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tmp = [],
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i,
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j;
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for (i = 0; i < n; ++i){
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tmp[i] = [points[i][0], points[i][1]]; // save input
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}
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for (j = 1; j < n; ++j) {
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for (i = 0; i < n - j; ++i) {
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tmp[i][0] = (1 - t) * tmp[i][0] + t * tmp[parseInt(i + 1, 10)][0];
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tmp[i][1] = (1 - t) * tmp[i][1] + t * tmp[parseInt(i + 1, 10)][1];
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}
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}
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return [ tmp[0][0], tmp[0][1] ];
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};
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}, '3.18.1', {"requires": ["anim-xy"]});
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