// xAnimation r4, Copyright 2006-2009 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL
function xAnimation(r)
{
  this.res = r || 10;
}
xAnimation.prototype.init = function(e,t,or,ot,oe,a,b)
{
  var i = this;
  i.e = xGetElementById(e);
  i.t = t;
  i.or = or; // onRun
  i.ot = ot; // onTarget
  i.oe = oe; // onEnd
  i.a = a || 0; // acceleration type
  i.v = xAnimation.vf[i.a];
  i.qc = 1 + (b || 0); // quarter-cycles
  i.fq = 1 / i.t; // frequency
//  if (i.a) {              // r4
  if (i.a > 0 && i.a < 4) { // r4
    i.fq *= i.qc * Math.PI;
    if (i.a == 1 || i.a == 2) { i.fq /= 2; }
  }
//  else { i.qc = 1; } // r4
  // displacements
  i.xd = i.x2 - i.x1;
  i.yd = i.y2 - i.y1;
  i.zd = i.z2 - i.z1;
};
xAnimation.prototype.run = function(r)
{
  var i = this;
  if (!r) { i.t1 = new Date().getTime(); }
  if (!i.tmr) i.tmr = setInterval(
    function() {
      i.et = new Date().getTime() - i.t1;
      if (i.et < i.t) {
        i.f = i.v(i.et * i.fq);
        i.x = i.xd * i.f + i.x1;
        i.y = i.yd * i.f + i.y1;
        i.z = i.zd * i.f + i.z1;
        i.or(i);
      }
      else { // target time reached
        clearInterval(i.tmr);
        i.tmr = null;
        if (i.qc % 2) {
          i.x = i.x2;
          i.y = i.y2;
          i.z = i.z2;
        }
        else {
          i.x = i.x1;
          i.y = i.y1;
          i.z = i.z1;
        }
        i.ot(i);
        var rep = false;
        if (typeof i.oe == 'function') { rep = i.oe(i); }
        else if (typeof i.oe == 'string') { rep = eval(i.oe); }
        if (rep) { i.resume(1); }
      }
    }, i.res
  );
};
xAnimation.vf = [
  function(r){return r;},
  function(r){return Math.abs(Math.sin(r));},
  function(r){return 1-Math.abs(Math.cos(r));},
  function(r){return (1-Math.cos(r))/2;},
  function(r) {return (1.0 - Math.exp(-r * 6));} // r4
];
xAnimation.prototype.pause = function()
{
  clearInterval(this.tmr);
  this.tmr = null;
};
xAnimation.prototype.resume = function(fs)
{
  if (typeof this.tmr != 'undefined' && !this.tmr) {
    this.t1 = new Date().getTime();
    if (!fs) {this.t1 -= this.et;}
    this.run(!fs);
  }
};