// xAnimation r3, Copyright 2006-2007 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; i.ot=ot; i.oe=oe;
  i.a = a||0;
  i.v = xAnimation.vf[i.a];
  i.qc = 1 + (b||0);
  i.fq = 1/i.t;
  if (i.a) {
    i.fq *= i.qc * Math.PI;
    if (i.a == 1 || i.a == 2) { i.fq /= 2; }
  }
  else { i.qc = 1; }
  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 {
        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;}
];

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);
  }
};

// xAnimation.size r2, Copyright 2006-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

xAnimation.prototype.size = function(e,w,h,t,a,b,oe)
{
  var i = this;
  i.x1 = xWidth(e); i.y1 = xHeight(e); // start size
  i.x2 = Math.round(w); i.y2 = Math.round(h); // target size
  i.init(e,t,o,o,oe,a,b);
  i.run();
  function o(i) { xWidth(i.e, Math.round(i.x)); xHeight(i.e, Math.round(i.y)); } // onRun and onTarget
};

// xAniLine r1, Copyright 2006-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xAniLine(e, x, y, t, a, oe)
{
  if (!(e=xGetElementById(e))) return;
  var x0 = xLeft(e), y0 = xTop(e); // start positions
  x = Math.round(x); y = Math.round(y);
  var dx = x - x0, dy = y - y0; // displacements
  var fq = 1 / t; // frequency
  if (a) fq *= (Math.PI / 2);
  var t0 = new Date().getTime(); // start time
  var tmr = setInterval(
    function() {
      var et = new Date().getTime() - t0; // elapsed time
      if (et < t) {
        var f = et * fq; // constant velocity
        if (a == 1) f = Math.sin(f); // sine acceleration
        else if (a == 2) f = 1 - Math.cos(f); // cosine acceleration
        f = Math.abs(f);
        e.style.left = Math.round(f * dx + x0) + 'px'; // instantaneous positions
        e.style.top = Math.round(f * dy + y0) + 'px';
      }
      else {
        clearInterval(tmr);
        e.style.left = x + 'px'; // target positions
        e.style.top = y + 'px';
        if (typeof oe == 'function') oe(); // 'onEnd' handler
        else if (typeof oe == 'string') eval(oe);
      }
    }, 10 // timer resolution
  );
}