/*

YUI 3.10.3 (build 2fb5187)

Copyright 2013 Yahoo! Inc. All rights reserved.

Licensed under the BSD License.

http://yuilibrary.com/license/

*/

YUI.add('anim-curve', function (Y, NAME) {

/**

 * 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) {

        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,

        tmp = [],

        i,

        j;

    for (i = 0; i < n; ++i){

        tmp[i] = [points[i][0], points[i][1]]; // save input

    }

    for (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] ];

};

}, '3.10.3', {"requires": ["anim-xy"]});