/**
* Used to calculate Bezier splines for any number of control points.
* @class Bezier
* @namespace YAHOO.util
*
*/
YAHOO.util.Bezier = new function()
{
/**
* 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.
* @method getPosition
* @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
*/
this.getPosition = 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] ];
};
};