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/* YUI 3.17.2 (build 9c3c78e) Copyright 2014 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 {Number[]} points An array containing Bezier points * @param {Number} t A number between 0 and 1 which is the basis for determining current position * @return {Number[]} 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] ]; }; }, '3.17.2', {"requires": ["anim-xy"]});
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