document.onmousemove = getMousePosition; //set document to record mouse position

//initialize arrays
var delayedXPos = new Array();
var delayedYPos = new Array();
var delayedTime = new Array();

var xPos = new Array();
var yPos = new Array();

//initialize time variables
var initTime = new Date().getTime();
var dt=10;
var timer_is_on=0;
var t;

//flag signaling whether getMousePosition has been called
mp_called = 0;

//function that determines action when mouse moves
function getMousePosition(mp) 
{
 var divPos = getPosition(document.getElementById("Questions"));
 xPos.push(mp.pageX - divPos[0]);
 yPos.push(mp.pageY - divPos[1]);
 mp_called = 1;
 return true;
}

function timedCount()
{
 if(mp_called){
   delayedXPos.push(xPos[xPos.length-1]);
   delayedYPos.push(yPos[yPos.length-1]);
   var timeInSec = (new Date().getTime()-initTime) / 1000.;
   delayedTime.push(timeInSec);
  }
  t=setTimeout("timedCount()",dt);
}

function doTimer()
{
 if (!timer_is_on)
 {
  initTime = new Date().getTime();
  timer_is_on=1;
  timedCount();
 }
}

function stopCount()
{
  clearTimeout(t);
  timer_is_on=0;

  Qualtrics.SurveyEngine.setEmbeddedData("xPos", delayedXPos.join());
  Qualtrics.SurveyEngine.setEmbeddedData("yPos", delayedYPos.join());
  Qualtrics.SurveyEngine.setEmbeddedData("time", delayedTime.join());
}


function getPosition(obj){
    
var topValue= 0,leftValue= 0;
    
while(obj)
{
 leftValue+= obj.offsetLeft;
 topValue+= obj.offsetTop;
 obj= obj.offsetParent;
}
    
return [leftValue, topValue];
}

//start collecting data after page loads
document.onload = doTimer();