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   1  /*
   2  YUI 3.17.2 (build 9c3c78e)
   3  Copyright 2014 Yahoo! Inc. All rights reserved.
   4  Licensed under the BSD License.
   5  http://yuilibrary.com/license/
   6  */
   7  
   8  YUI.add('anim-curve', function (Y, NAME) {
   9  
  10  /**
  11   * Adds support for the <code>curve</code> property for the <code>to</code>
  12   * attribute.  A curve is zero or more control points and an end point.
  13   * @module anim
  14   * @submodule anim-curve
  15   */
  16  
  17  Y.Anim.behaviors.curve = {
  18      set: function(anim, att, from, to, elapsed, duration, fn) {
  19          from = from.slice.call(from);
  20          to = to.slice.call(to);
  21          var t = fn(elapsed, 0, 100, duration) / 100;
  22          to.unshift(from);
  23          anim._node.setXY(Y.Anim.getBezier(to, t));
  24      },
  25  
  26      get: function(anim) {
  27          return anim._node.getXY();
  28      }
  29  };
  30  
  31  /**
  32   * Get the current position of the animated element based on t.
  33   * Each point is an array of "x" and "y" values (0 = x, 1 = y)
  34   * At least 2 points are required (start and end).
  35   * First point is start. Last point is end.
  36   * Additional control points are optional.
  37   * @for Anim
  38   * @method getBezier
  39   * @static
  40   * @param {Number[]} points An array containing Bezier points
  41   * @param {Number} t A number between 0 and 1 which is the basis for determining current position
  42   * @return {Number[]} An array containing int x and y member data
  43   */
  44  Y.Anim.getBezier = function(points, t) {
  45      var n = points.length,
  46          tmp = [],
  47          i,
  48          j;
  49  
  50      for (i = 0; i < n; ++i){
  51          tmp[i] = [points[i][0], points[i][1]]; // save input
  52      }
  53  
  54      for (j = 1; j < n; ++j) {
  55          for (i = 0; i < n - j; ++i) {
  56              tmp[i][0] = (1 - t) * tmp[i][0] + t * tmp[parseInt(i + 1, 10)][0];
  57              tmp[i][1] = (1 - t) * tmp[i][1] + t * tmp[parseInt(i + 1, 10)][1];
  58          }
  59      }
  60  
  61      return [ tmp[0][0], tmp[0][1] ];
  62  
  63  };
  64  
  65  
  66  }, '3.17.2', {"requires": ["anim-xy"]});