/* (c) 2001 Ulrich Kritzner */

function ElRotor_Init_Line(count,stepx,stepy,startx,starty)
{
  var i;
  this.PCount=0;
  for (i=0;i<count;i++)
    this.AddPoint(startx+i*stepx,starty+i*stepy);
  this.Pos();
}

function ElRotor_Init_Circle(count,radiusx,radiusy,middlex,middley)
{
  var i;
  var fkt;
  this.PCount=0;
  for (i=0;i<count;i++)
  {
    fkt=Math.PI*2/count;
    this.AddPoint(Math.sin(i*fkt)*radiusx+middlex,-Math.cos(i*fkt)*radiusy+middley);
  }
  this.Pos();
}

function ElRotor_Pos()
{
  with (this)
  {
    var i;
    for (i=0;i<ElCount;i++)
    {
      Elements[i].left=Pointsx[(current+Numplus[i])%PCount]+Elleft[i];
      Elements[i].top=Pointsy[(current+Numplus[i])%PCount]+Eltop[i];
    }
  }
}

function ElRotor_TimerFunc()
{
  with (this)
  {
    switch (modus)
    {
      case 0:
        current=(current+1)%PCount;
        this.Pos();
	break;
      case 1:
        current=(current+PCount-1)%PCount;
        this.Pos();
        break;
    }
    if (((current+Numplus[eltarget])%PCount)==ptarget)
    {
      this.eltarget=-1;
      this.ptarget=-1;
      this.timestep=0;
      if (this.EventHandler)
        this.EventHandler(0);
    }
  }
}

function ElRotor_Add_Point(pointleft,pointtop)
{
  with (this)
  {
    Pointsx[PCount]=pointleft;
    Pointsy[PCount]=pointtop;
    PCount++;
  }
}

function ElRotor_Add_Element(elementname,numplus,elleft,eltop)
{
  with (this)
  {
    Elleft[ElCount]=elleft;
    Eltop[ElCount]=eltop;
    if (window.document.all)
      Elements[ElCount]=eval("window.document.all."+elementname+".style");
    else
      if (typeof(window.document.getElementById)=="function")
        Elements[ElCount]=window.document.getElementById(elementname).style;
      else
        Elements[ElCount]=eval("window.document."+elementname);
    Numplus[ElCount]=numplus;
    ElCount++;
  }
}

function ElRotor_Set_Event_Handler(eventhandler)
{
  this.EventHandler=eventhandler;
}

function ElRotor_Stop()
{
  var oldrun=this.timestep;
  this.timestep=0;
  if (oldrun)
    if (this.EventHandler)
      this.EventHandler(0);
}

function ElRotor_Step()
{
  if (this.timestep==0)
    this.TimerFunc();
}

function ElRotor_Continue()
{
  this.Stop();
  this.timestep=this.time_step;
  if (this.EventHandler)
    this.EventHandler(1);
  u_timer_continue();
}

function ElRotor_RoTo(eltarget,ptarget)
{
  this.Stop();
  if ((eltarget>=0)&&(ptarget>=0))
  {
    this.eltarget=eltarget%this.ElCount;
    this.ptarget=ptarget%this.PCount;
  }
  else
  {
    this.eltarget=-1;
    this.ptarget=-1;
  }
  this.timestep=this.time_step;
  if (this.EventHandler)
    this.EventHandler(1);
  u_timer_continue();
}

function ElRotor_Animate(modus)
{
  this.Stop();
  this.timestep=this.time_step;
  this.modus=modus;
  if (this.timestep>0)
  {
    if (this.EventHandler)
      this.EventHandler(1);
    u_timer_continue();
  }
}

function ElRotor_Set_TimeStep(timestep)
{
  this.time_step=timestep;
  this.timestep=timestep;
  if (this.timestep>0)
  {
    if (this.EventHandler)
      this.EventHandler(1);
    u_timer_continue();
  }
}

function ElRotor(timestep)
{
  this.RoTo=ElRotor_RoTo;
  this.InitLine=ElRotor_Init_Line;
  this.InitCircle=ElRotor_Init_Circle;
  this.SetTimeStep=ElRotor_Set_TimeStep;
  this.Stop=ElRotor_Stop;
  this.Step=ElRotor_Step;
  this.Continue=ElRotor_Continue;
  this.Animate=ElRotor_Animate;
  this.TimerFunc=ElRotor_TimerFunc;
  this.Pos=ElRotor_Pos;
  this.AddElement=ElRotor_Add_Element;
  this.AddPoint=ElRotor_Add_Point;
  this.SetEventHandler=ElRotor_Set_Event_Handler;
  this.time_step=timestep;
  this.eltarget=-1;
  this.ptarget=-1;
  this.modus=0;
  this.PCount=0;
  this.ElCount=0;
  this.Pointsx=new Array();
  this.Pointsy=new Array();
  this.Elleft=new Array();
  this.Eltop=new Array();
  this.Elements=new Array();
  this.Numplus=new Array();
  this.current=0;
  this.timestep=0;
  this.timeval=0;
  u_timer_add_object(this);
}