/* Generic Animation Framework For Extraordinary Results (GAFFER) - Basic Animations (c) 2007 */
var fod=true;

function quadraticAni(v) {
   return v*v;
}

function quadraticOutAni(v) {
   return 1-(1-v)*(1-v);
}

function cubicAni(v) {
   return v*v*v;
}

function cubicOutAni(v) {
   return 1-(1-v)*(1-v)*(1-v);
}

function easeInOutAni(v) {
	if(v<.5) {
		return .5*Math.pow(2*v,3);
	} else {
		return 1-.5*Math.pow(2-2*v,3);
	}
}

/*function bounceOutAni(v) {
   return v * v * (5-4*v);
}*/


function FadeAni(object, stps, from, to, fct) {
   this.steps = stps;
   this.assocObject=object;
   this.onFinish=null;
   this.currStep = 0;
   this.stepFunction = fct;
   var me = this;
   var fadeFrom=from; var fadeTo=to;
   
   function setOpa(value) {
      if(!isIE) {
         me.assocObject.style.opacity=value;
      } else {
         me.assocObject.style.filter="alpha(opacity = " + Math.round((value)*100) + ");";
      }
   }   
   
   this.prepare = function() {
      gaffer_genericPrepare(me);
      return me;
   }
   
   this.start = function() {
      setOpa(fadeFrom);
      gaffer_genericStart(me);
      return me;
   }

   this.nextStep = function() {
      me.currStep++;
      if(me.currStep==me.steps) { me.finish(); return; }

      if(this.stepFunction) {
         setOpa(fadeFrom +(fadeTo-fadeFrom) * this.stepFunction(me.currStep/me.steps));
      } else {
         setOpa(fadeFrom +(fadeTo-fadeFrom) * me.currStep/me.steps);
      }
      return me;
   }

   this.cancel = function() {
      me.finish();
      return me;
   }

   this.finish = function() {
      setOpa(fadeTo);
      gaffer_genericFinish(me);
      return me;
   }

}

function RollDownAni(object, stps, fct) {
   this.steps = stps;
   this.assocObject=object;
   this.onFinish=null;
   this.currStep = 0;
   this.stepFunction = fct;
   var me = this;
   
   this.prepare = function() {
      gaffer_genericPrepare(me);
      return me;
   }
   
   this.start = function() {
      var aO=me.assocObject;
      me.oldH=aO.style.height;
      me.oldOvf=aO.style.overflow;
      gaffer_prepAniCont(aO);
         me.destH=viewHeight(aO);
         aO.style.overflow="hidden";
         if(isIE) aO.style.height="1px"; else aO.style.height="0px";
      gaffer_unprepAniCont(aO);
      gaffer_genericStart(me);
      return me;
   }

   this.nextStep = function() {
      me.currStep++;
      if(me.currStep==me.steps) { me.finish(); return; }

      var hei;
      if(this.stepFunction) {
         hei = this.stepFunction(me.currStep/me.steps)*me.destH;
      } else {
         hei=(me.currStep/me.steps)*me.destH;
      }
      if(isIE && hei<1) hei = 1;
      me.assocObject.style.height=hei + "px";
      return me;
   }

   this.cancel = function() {
      me.finish();
      return me;
   }

   this.finish = function() {
      me.assocObject.style.height=me.oldH;
      me.assocObject.style.overflow=me.oldOvf;
      gaffer_genericFinish(me);
      return me;
   }

}

function RollUpAni(object, stps, fct) {
   this.steps = stps;
   this.assocObject=object;
   this.onFinish=null;
   this.currStep = 0;
   this.stepFunction = fct;
   var me = this;
   
   this.prepare = function() {
      gaffer_genericPrepare(me);
      return me;
   }
   
   this.start = function() {
      me.oldHVal=me.assocObject.style.height;
      me.oldH=viewHeight(me.assocObject);
      me.oldOvf=me.assocObject.style.overflow;
      me.assocObject.style.overflow="hidden";
      gaffer_genericStart(me);
      return me;
   }

   this.nextStep = function() {
      me.currStep++;
      if(me.currStep==me.steps) { me.finish(); return; }

      if(this.stepFunction) {
         me.assocObject.style.height=this.stepFunction(1-me.currStep/me.steps)*me.oldH + "px";
      } else {
         me.assocObject.style.height=(1-me.currStep/me.steps)*me.oldH + "px";
      }
      return me;
   }

   this.cancel = function() {
      me.finish();
      return me;
   }

   this.finish = function() {
      me.assocObject.style.display="none";
      me.assocObject.style.height=me.oldHVal;
      me.assocObject.style.overflow=me.oldOvf;
      gaffer_genericFinish(me);
      return me;
   }

}


function CombinedAni(obj, anis) {
   this.animations=anis;
   //this.steps = stps;
   this.assocObject=obj;
   this.onFinish=null;
   var me = this;
   var running=0;

   for(var i = 0; i<me.animations.length; i++) {
      me.animations[i].inCombination=true;
      me.animations[i].onFinish = function() { running-- }
      running++;
   } 
   
   this.prepare = function() {
      for(var i = 0; i<me.animations.length; i++) {
         me.animations[i].prepare();
      } 
      gaffer_genericPrepare(me);
      return me;
   }
   
   this.start = function() {
      for(var i = 0; i<me.animations.length; i++) {
         me.animations[i].start();
      } 
      gaffer_genericStart(me);
      return me;
   }

   this.nextStep = function() {
      for(var i = 0; i<me.animations.length; i++) {
         if(!me.animations[i].finished) {
            me.animations[i].nextStep();
         }
      } 
      if(running==0) me.finish();
      return me;
   }

   this.cancel = function() {
      for(var i = 0; i<me.animations.length; i++) {
         if(!me.animations[i].finished) {
            me.animations[i].cancel();
         }
      }
      me.finish(); 
      return me;
   }

   this.finish = function() {
      gaffer_genericFinish(me);
      return me;
  }

}

function aniRollDown(obj, steps, onFinish, fct) {
  var ani = new RollDownAni(obj, steps, fct);
  ani.onFinish = onFinish;
  ani.prepare().start();
}

function aniRollUp(obj, steps, onFinish, fct) {
  var ani = new RollUpAni(obj, steps, fct);
  ani.onFinish = onFinish;
  ani.prepare().start();
}

function aniFade(obj, steps, from, to, onFinish, fct) {
  var ani = new FadeAni(obj, steps, from, to, fct);
  ani.onFinish = onFinish;
  ani.prepare().start();
}

function aniFadeIn(obj, steps, onFinish, fct) {
  var ani = new FadeAni(obj, steps, 0, 1, fct);
  ani.onFinish = onFinish;
  ani.prepare().start();
  obj.style.display="block";
}

function aniFadeOut(obj, steps, onFinish, fct) {
  var ani = new FadeAni(obj, steps, 1, 0, fct);
  var ofi=onFinish;
  ani.onFinish = function() {
     obj.style.display="none";
     if(ofi!=null) ofi();
  }
  ani.prepare().start();
}

function aniFadeDown(obj, steps, onFinish, fct) {
  var ani = new CombinedAni(obj, new Array(new FadeAni(obj, steps, 0, 1, fct), new RollDownAni(obj, steps, fct)));
  ani.onFinish = onFinish;
  ani.prepare().start();
}

function aniFadeUp(obj, steps, onFinish, fct) {
  var ani = new CombinedAni(obj, new Array(new FadeAni(obj, steps, 1, 0, fct), new RollUpAni(obj, steps, fct)));
  ani.onFinish = onFinish;
  ani.prepare().start();
}