var jwindow = new JitterObject("jit.window", "sfighter");
    jwindow.rect=[recta,rectb,rectc,rectd]; // window position
var jrender = new JitterObject("jit.gl.render", "sfighter");
    jrender.erase_color = [0,0,0,1]; //background color

var colorr=1; var colorg=1; var colorb=1; var colora=0.3;

//var xpos=0.9;
//var ypos=0.2;
//var zpos=0.;

var counter = 0;
var texts = " "
var Ntext = 50; // numbers of text object

var width=jrender.screentoworld[0];
var height=jrender.screentoworld[1];

//window frame...need to be improved///////////////////////////////////////////
var top=0.75;
var right=1.0;
var bottom=-0.8;
var left=-1.0;


//texts volicity////////////////////////////////////////////////////////////////
var vx = new Array();
var vy = new Array();
for (var i=0 ; i< Ntext; i++){
    vx[i] = 0.01*Math.random();
    vy[i] = 0.01*Math.random();
    }


/////draw mult points function///////////////////////////////////////////////////
var xpos = new Array();
var ypos = new Array();

var jmatrix = new JitterMatrix();
function jit_matrix(name){
    jmatrix.name = name;
    jmatrix.dim = [jmatrix.dim[0],1]
    for(var i=0 ; i<jmatrix.dim[0] ;i++){
       for(var j=0 ; j<jmatrix.dim[1] ;j++){
       //drawpoint
        xpos[i] = (jmatrix.getcell(i,j)[0]/320)*5-1;
        ypos[i] = (jmatrix.getcell(i,j)[1]/160)*5-1;
        jpoint.point(xpos[i],ypos[i],0.);
        //post(jmatrix.getcell(i,j)[0]);
        //post(jmatrix.getcell(i,j)[1]);
        //post(xpos[i],xpos[i])
        
        
       }
    }
}


//init textsobjs////////////////////////////////////////////////////////////////
var jtext2ds = new Array(Ntext);
for (var i=0 ; i< Ntext; i++)
{
    jtext2ds[i] = new JitterObject("jit.gl.text2d", "sfighter");
    jtext2ds[i].text(texts);
    jtext2ds[i].size(16);
    jtext2ds[i].align=1;
    jtext2ds[i].position = [Math.random(),Math.random()];
}

//init center obj
/*var jtext2d = new JitterObject("jit.gl.text2d","sfighter");
    jtext2d.text("Init");
    jtext2d.size(60);
    jtext2d.align = 1;
    jtext2d.position = [xpos,ypos,zpos];
*/

//init sketchobject/////////////////////////////////////////////////////////////
var jpoint = new JitterObject("jit.gl.sketch", "sfighter");
    jpoint.point(0,0,0);
    jpoint.depth_enable = 1;
    jpoint.smooth_shading = 1;
    jpoint.lighting_enable = 1;

var pointsize = 2;


var jhandle = new JitterObject("jit.gl.handle", "sfighter");
    jhandle.inherit_transform = 1;

   
function bang(){
   //jhandle.rotatexyz = [handx,handy,handz];
   jpoint.point_size = pointsize;

   //drawtext();
   //textmove()
   
   //jtext2ds[0].position =[Math.random()*0.2,0,0];
   
   for(var i=0 ; i<Ntext; i++){
   jtext2ds[i].position = [jtext2ds[i].position[0]+vx[i],jtext2ds[i].position[1]+vy[i]];
   
   //find boundry//////////////////////////////////////////////////////////////
   if(jtext2ds[i].position[0]>right){
      jtext2ds[i].position[0]=right;
      vx[i]*=-1;
   }else if(jtext2ds[i].position[0]<left){
      jtext2ds[i].position[0]=left;
      vx[i]*=-1;
   }
   if(jtext2ds[i].position[1]>top){
      jtext2ds[i].position[1]=top;
      vy[i]*=-1;
   }else if(jtext2ds[i].position[1]<bottom){
      jtext2ds[i].position[1]=bottom;
      vy[i]*=-1;
   }
   
   //Collision motion///////////////////////////////////////////////////////////
   for(var j=0; j<jmatrix.dim[0] ;j++){
       var dx = jtext2ds[i].position[0] - xpos[j];
       var dy = jtext2ds[i].position[1] - ypos[j];
       var dist = Math.sqrt(dx*dx+dy*dy);
   
   //Collision distance
       var minDist = 0.5;
   
   //Collision effect
       if(dist < minDist){
          var angle = Math.atan2(dy,dx);
          var targetX = xpos[j] + Math.cos(angle)*minDist;
          var targetY = ypos[j] + Math.sin(angle)*minDist;
          vx[i] += (targetX-jtext2ds[i].position[0])*.01;
          vy[i] += (targetY-jtext2ds[i].position[1])*.01;
          //jtext2ds[i].text(" ");
          jtext2ds[i].color=[Math.random(),0,Math.random(),1.];
          jtext2ds[i].size(Math.ceil(60*Math.random()));
          post(xpos[j],ypos[j]);
          }
     }
         
   }
  
   jrender.erase();
  
   jrender.rotate = jhandle.rotate;
   jrender.position = jhandle.position;
   jhandle.auto_rotate = 1;
   jrender.drawswap();
   jpoint.reset();
   }

function collide(){
  /*for(var i=0 ; i< Ntext; i++)
  {
     var disx=jtext2ds[i].position[0]
  }*/
 }



//once add a new text create a new text object
function settext(t)
{   //texts = t;
    if(counter<Ntext){
    jtext2ds[counter].text(t);
    jtext2ds[counter].color=[colorr,colorg,colorb,colora];
    counter++;
    }else{
    counter=0;
    jtext2ds[counter].text(t);
    jtext2ds[counter].color=[colorr,colorg,colorb,colora];
    }
}




function drawtext()
{
   for (var i=0; i<Ntext; i++){
   jtext2ds[i].position = [xpos+(i/10), ypos+(i/10), zpos];
   //jtext2ds[i].position = [-1, 0.75, zpos];
   //jtext2ds[i].position = [ 0.5*Math.sin(i), 0.5*Math.cos(i)];
   
   }

   /*var Nd = (Math.sqrt(Ntext));
   for(var u=0; u<Nd; u++){
    for(var v=0; v<Nd; v++){
    var uu=u/Nd;
    var vv=v*3.1416/Nd;

   xx = (2 + uu*Math.cos(vv))*Math.sin(2*3.1416*uu)
   yy = (2 + uu*Math.cos(vv))*Math.cos(2*3.1416*uu) + 2*uu
   //zz =  uu*Math.sin(vv)
   jtext2ds[u*Nd+v].position = [xx/2, yy/2];
   
   }
   }*/
  
}

function setcolor(r,g,b)
{
   colorr=r;
   colorg=g;
   colorb=b;
   colora=0.3
}

/*function setcolor2(r,g,b)
{
   colorr=r;
   colorg=g;
   colorb=b;
}*/


function sethand(x,y,z)
{
   handx=x;
   handy=y;
   handz=z;
}


function setpos(x,y)
{

   xpos =x;
   ypos =y;
   //zpos=z;
}
function windowrect(a,b,c,d)
{
	recta=a;
	rectb=b;
	rectc=c;
	rectd=d;
	}