Untitled

function filterFunc(cx,cy,iter){
  var x=cx,y=cy,tmp;
  for(var i=0;i<iter&&x*x+y*y<10;i++){
    tmp = x*x - y*y + cx;
    y = 2*x*y + cy + 0.3*Math.sin(x);
    x = tmp;
  }
  return i<iter;
}

function tracerFunc(cx,cy,iter,emit){
  var x=cx,y=cy,tmp;
  for(var i=0;i<iter&&x*x+y*y<10;i++){
    tmp = x*x - y*y + cx;
    y = 2*x*y + cy + 0.3*Math.sin(x);
    x = tmp;
    emit(x,y);
  }
}