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Which method is called when image is recognized in WTArchitect in ios?

Which method is called when image is recognized in WTArchitect in ios?

I using this code, , so no image tracking is done ? and its right also because we destroy this object? so where i call this function? please suggest me?    

  var trackObj1=new AR.Trackable2DObject(logoTracker, targetIds, { drawables: { cam: },onEnterFieldOfVision: generate (targetIds), onExitFieldOfVision:generate (targetIds)


I also used this code

var trackObj1=;
        trackable2DObjects.push(new AR.Trackable2DObject(logoTracker, targetIds, { drawables: { cam: },onEnterFieldOfVision: generate (targetIds), onExitFieldOfVision:generate (targetIds)


Recognization is not perform ? so where i call this method?

Hello Sir, this is my code in .HTML file please say me where can i destroy trackable2Ds array/ object , so my application not be become crashes in iphone which runs fine in ipad. Please i am in problem from last 2days.


<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta name="viewport" content="target-densitydpi=device-dpi, width = 540, user-scalable = 0" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Simple IR World</title>

<style type="text/css">
    .info {
        color: #9F6000;
        background-color: #FEEFB3;
        margin: -8px 1%;
        padding: 10px;
        font-size: 14pt;
        border-radius: 0 0 10px 10px;
        text-align: center;

<!-- Include the ARchitect library -->
<script src="architect://architect.js"></script>

<script src="../ade.js"></script>

//    <a href="didTap://button1"><img src="button1.jpg" /></a>

/* Global variables */
var logoTracker = null;
var overlay = null;
var trackable2DObject = null;
var trackable2DObjects = new Array();
var errorOccured = false;
var masterAnimationGroup  = null;
var trackerDataSetPath = null;

var targetIds = new Array();
//variable that keeps the jsonData received from the native app
var jsonObject;

function error() {
    errorOccured = true;
    document.getElementById("messageElement").innerHTML = "Unable to load image or tracker!";

function createTracker(){
    var image = new AR.ImageResource("target.png", {onError: error});
    overlay = new AR.ImageDrawable(image, 1.0, {zOrder: 0});
    // create tracker
    logoTracker = new AR.Tracker(trackerDataSetPath, { onLoaded : trackerLoaded, onError: error });

    // relative position from teh arrows
    arrowXOffset = 2.0;
    arrowYOffset = 0.1;

    var arrow1 = arrowWithDirectionality(-arrowXOffset, -arrowYOffset, -45);
    var arrow2 = arrowWithDirectionality(-arrowXOffset, arrowYOffset, 45);
    var arrow3 = arrowWithDirectionality(-arrowXOffset, -arrowYOffset, 135);
    var arrow4 = arrowWithDirectionality(-arrowXOffset, arrowYOffset, 225);

    for (var i = 0; i < targetIds.length; i++)
       //alert (targetIds);
        var trackObj1=new AR.Trackable2DObject(logoTracker, targetIds, { drawables: { cam: },onEnterFieldOfVision: generate (targetIds), onExitFieldOfVision:generate (targetIds)

    // we need to pack the arrow animations into a parallel animation group to play them synchronisly
    masterAnimationGroup = new AR.AnimationGroup(AR.CONST.ANIMATION_GROUP_TYPE.PARALLEL, );
function generate(id) { return function() {
    document.location = "architectsdk://TrackerDidDiscoveredImageTarget?id="+id;

    //function called from the native app fia callJavascript method
    //receives json-data as string and processes the contained information
function newData(jsonData){
        jsonObject = JSON.parse(jsonData);
   // alert(jsonObject.length);
        for(var i = 0; i < jsonObject.length; i++)
    //alert (jsonData);
        //document.getElementById("statusElement").innerHTML='JSON objects loaded';    

function trackerLoaded()
    if (errorOccured) return;

    document.getElementById("messageElement").style.display = "none";
    // start with the parameter -1 indicates, that the group will play the animation in an infinite loop

function arrowWithDirectionality(offsetX, offsetY, roll)

    var animationOffset = 0.9; // distance in sdu's
    var animationTime = 700; // ms

    // load the arrow image
    var arrowImage = new AR.ImageResource("DirectionArrow.png");

    // attach the image resource to a drawable, so that its visible on the screen
    var arrowImageDrawable = new AR.ImageDrawable(arrowImage, 0.6, {offsetX: offsetX, offsetY: offsetY, zOrder: 1, roll: roll} );

    // we want to animte the arrow, to lets add two animation
    var arrowSpinAnimation = new AR.PropertyAnimation(arrowImageDrawable, "tilt", 0, 360, animationTime, {type: AR.CONST.EASING_CURVE_TYPE.LINEAR});

    // the first one moves the arrow to the trackableObject
    var arrowAnimationMoveDown = new AR.PropertyAnimation(arrowImageDrawable, "offsetX", offsetX, offsetX+animationOffset, animationTime, {type: AR.CONST.EASING_CURVE_TYPE.EASE_IN_CUBIC});

    // the second one moves it back to the original position
    var arrowAnimationMoveUp = new AR.PropertyAnimation(arrowImageDrawable, "offsetX", offsetX+animationOffset, offsetX, animationTime, {type: AR.CONST.EASING_CURVE_TYPE.EASE_OUT_CUBIC});

    // because these two animations should be played one after another, we gonna pack them into a sequential animation group.
    var animationGroup = new AR.AnimationGroup(AR.CONST.ANIMATION_GROUP_TYPE.SEQUENTIAL, );

    var arrow = new Array(arrowImageDrawable, animationGroup);

    return arrow;

<div class="info" id="messageElement">Loading ...</div>

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