Develop Reference

How can i get aframe box vertex coordinates?

I need to get vertex from an object (box) in an AFRAME or i need to calculate intersection between raycaster and the face of an entity.
Someone can help me? Thank you all!ç
EDIT: I added code below.
AFRAME.registerComponent("intersection-handler", {
schema: {
fps: { type: 'number', default: 15 }
},
init: function() {
this.bindMethods();
},
tick: function(){
if(new Date().getTime()-this.lastTick<(1000/this.data.fps))return;
if(this.isIntersecting){
let distance = this.calculateDistance(this.el.object3D.position, this.hittedElem.object3D.position);
this.el.emit('intersection-detected-' + this.el.id, distance );
}else{
this.el.emit('intersection-cleared-' + this.el.id);
}
this.lastTick = new Date().getTime();
},
bindMethods(){ // You could do all of this directly in your init() method, but I like to separate it.
this.onIntersection = this.onIntersection.bind(this);
this.onIntersectionClear = this.onIntersectionClear.bind(this);
},
play: function() {
this.registerEventListeners(); // It's a good practice in general to enable your event listeners here.
},
pause: function() {
this.deregisterEventListeners(); // Similarly a good practice to remove them here so that they don't stay bound while the scene isn't actually 'running'
},
registerEventListeners() {
this.el.addEventListener('raycaster-intersection', this.onIntersection);
this.el.addEventListener('raycaster-intersection-cleared', this.onIntersectionClear);
},
deregisterEventListeners() {
this.el.removeEventListener('raycaster-intersection', this.onIntersection);
this.el.removeEventListener('raycaster-intersection-cleared', this.onIntersectionClear);
},
onIntersection: function(e) {
console.log(this.el.components.raycaster.getIntersection(e.detail.els[0]))
this.isIntersecting = true;
if(e.detail.intersections[0].object){
this.hittedElem = e.detail.intersections[0].object.el;
}
},
onIntersectionClear: function(e) {
this.isIntersecting = false;
},
calculateDistance: function(myElposition, hittedElposition) {
// distance = sqrt((x2 - x1)^2 + (y2 - y1)^2) - rolloff
let rolloffFactor = 0.5;
let d = Math.sqrt(Math.pow((hittedElposition.x - myElposition.x), 2) + Math.pow((hittedElposition.y - myElposition.y), 2)) - rolloffFactor;
return d;
}
});
I can't use the raycaster-intersected event, i'm managing intersections on raycaster side not in the other entities.

no need for the vertex coordinates. The raycasters intersection.point contains a Vector3 with the intersection position.
On the other hand if you get your camera (raycasters origin) position, you get another Vector3.
From the three.js docs, you can get the distance between them with a simple a.distanceTo(b).
Fiddle here.

multiple HTML5 canvas with Neurosky sensor input is not working

I have created multiple html5 canvas using instantiation mode in P5JS. I am using Neurosky mindwave EEG sensor to activate and deactivate canvas one by one. Neurosky mindwave EEG sensor can detect user's eye blink which I am using as input. When user blinks, it should activate one canvas and deactivate another canvas and vice-versa.I am using Neurosky mindwave EEG sensor to activate and deactivate canvas one by one. Neurosky mindwave EEG sensor can detect user's eye blink which I am using as input. When user blinks, it should activate one canvas and deactivate another canvas and vice-versa.
Just to check if my code logic works, I used mouse pressed input to switch between the canvas and it worked perfectly. But, when I used it with the sensor it didn't work.
What I did - I have created multiple HTML5 canvas using instantiation mode in P5JS. I have used node-neurosky node module to capture the eyeblink data from the sensor. Node Module
What worked - When I launch the app it takes the eye blink as input for the first time and activate the another canvas but when I blink again it doesn't deactivate the current canvas and activate another canvas. I have tried printing flags to check the code and it is doing fine. Eyeblink gets detected every time when I blink but it doesn't switch the canvas.
What didn't work - When I tried to use eye blink strength directly into the sketch.js it didn't work then I created another boolean variable eyeclick which also didn't work.
sketch.js
var stateTwo, stateOne = true;
// sketch one -----------------------------------
var first = new p5(firstSketch, "canvasOne");
function firstSketch(p) {
p.setup = function() {
p.createCanvas(400, 250);
}
p.draw = function() {
p.background(255, 10, 100);
p.fill(255);
p.ellipse(p.width / 2, p.height / 2, 50, 50);
if (eyeclicked) {
stateOne = false;
stateTwo = true;
console.log(" canvas <-- one");
// k = 0;
eyeclicked = false;
}
if (stateOne) {
$('#canvasOne').css('opacity', '1');
$('#canvasTwo').css('opacity', '0.5');
// console.log("canvas One");
p.fill(255, 0, 0);
p.ellipse(p.random(p.width), p.random(p.height), 50, 50);
}
}
}
// sketch two -----------------------------------
var second = new p5(secondSketch, "canvasTwo");
function secondSketch(p) {
p.setup = function() {
p.createCanvas(400, 250);
}
p.draw = function() {
p.background(60, 250, 100);
p.fill(0);
p.ellipse(p.width / 2, p.height / 2, 50, 50);
if (eyeclicked) {
stateOne = true;
stateTwo = false;
console.log(" canvas <-- two");
// k = 0;
eyeclicked = false;
}
if (stateTwo) {
$('#canvasOne').css('opacity', '0.5');
$('#canvasTwo').css('opacity', '1');
// console.log("canvas Two");
p.fill(0, 0, 255);
p.ellipse(p.random(p.width), p.random(p.height), 50, 50);
}
}
}
NodeCode to connect with sensor connect.js
var attention = 0;
var meditation = 0;
var blink;
var poorSignalLevel = 0;
var eyeclicked = false;
if ("WebSocket" in window) {
console.log("WebSocket is supported by your Browser. Proceed.");
// $('#connect-controls').show();
}
var ws = new WebSocket("ws://127.0.0.1:8080");
ws.onopen = function() {
console.log('opened connection');
ws.send("Hello from websocket client!");
};
// whenever websocket server transmit a message, do this stuff
ws.onmessage = function(evt) {
// parse the data (sent as string) into a standard JSON object (much easier to use)
var data = JSON.parse(evt.data);
// handle "eSense" data
if (data.eSense) {
$('#brain').css({
opacity: 1
});
attention = data.eSense.attention;
meditation = data.eSense.meditation;
// brainProgress('#focusProgress', attention);
// brainProgress('#medProgress', meditation);
$("#focus").text(attention);
$("#meditation").text(meditation);
}
// handle "blinkStrength" data
if (data.blinkStrength) {
blink = data.blinkStrength;
var blinkcol = "white";
var eyeVal = map_range(blink, 0, 255, 0, 100);
$('#eyeBlinkStrength').text(parseInt(eyeVal));
if (blink > 40) {
//blinkcol = "rgba(102,211,43,1.0)";
eyeclicked = true;
// k++;
console.log(blink + " " + eyeclicked);
} else blinkcol = "white";
$('#eyeBlink').css({
width: eyeVal,
height: eyeVal,
background: blinkcol
});
} else {
blink = 0;
eyeclicked = false;
}
// handle "poorSignal" data
if (data.poorSignalLevel != null) {
poorSignalLevel = parseInt(data.poorSignalLevel);
}
};
// when websocket closes connection, do this stuff
ws.onclose = function() {
// websocket is closed.
console.log("Connection is closed...");
};
function map_range(value, low1, high1, low2, high2) {
return low2 + (high2 - low2) * (value - low1) / (high1 - low1);
}
EDIT CODE PEN DEMO
Mouse Input Based Code which demonstrate the logic of switching between multiple canvas. It works perfectly. Try to click into the center circle
var stateTwo, stateOne = true;
var eyeIsBlinked;
// sketch one -----------------------------------
var first = new p5(firstSketch, "canvasOne");
function firstSketch(p) {
p.setup = function() {
p.createCanvas(400, 250);
}
p.draw = function() {
p.background(255, 10, 100);
p.fill(255);
p.ellipse(p.width / 2, p.height / 2, 50, 50);
if (p.mouseIsPressed && p.dist(p.mouseX, p.mouseY, p.width / 2, p.height / 2) < 50) {
stateOne = false;
stateTwo = true;
console.log(" <-- one");
// k = 0;
// window.eyeIsBlinked = false;
// blink = 0;
}
if (stateOne) {
$('#canvasOne').css('opacity', '1');
$('#canvasTwo').css('opacity', '0.5');
// console.log("canvas One");
p.fill(255, 0, 0);
p.ellipse(p.random(p.width), p.random(p.height), 50, 50);
}
}
}
// sketch two -----------------------------------
var second = new p5(secondSketch, "canvasTwo");
function secondSketch(p) {
p.setup = function() {
p.createCanvas(400, 250);
}
p.draw = function() {
p.background(60, 250, 100);
p.fill(0);
p.ellipse(p.width / 2, p.height / 2, 50, 50);
if (p.mouseIsPressed && p.dist(p.mouseX, p.mouseY, p.width / 2, p.height / 2) < 50) {
stateOne = true;
stateTwo = false;
console.log(" <-- two");
// k = 0;
// window.eyeIsBlinked = false;
//blink = 0;
}
if (stateTwo) {
$('#canvasOne').css('opacity', '0.5');
$('#canvasTwo').css('opacity', '1');
// console.log("canvas Two");
p.fill(0, 0, 255);
p.ellipse(p.random(p.width), p.random(p.height), 50, 50);
}
}
}

I don't know how your project works. But I guess the problem might be a scope problem. Both files are using the eyeclicked variable, but they might be using two different variables. Try to make sure that they're using the same variable by using it inside the window global variable.
So instead of eyeclicked use window.eyeclicked.

Phaser Draggable Grouped World Map

I found this great tutorial on creating draggable maps with inertia: http://www.emanueleferonato.com/2016/01/18/how-to-create-a-html-draggable-and-scrollable-map-with-inertia-using-phaser-framework/
The tutorial has the dragging effect applied on just an image. I'm trying to have the dragging effect applied on a group of sprites instead, so they would all drag at the same time (map image + group of sprites).
The issue I have is that I'm a little confused about what this.scrollingMap represents syntax-wise. So when it comes to replacing this line with a group, I'm a little lost.
this.scrollingMap = game.add.image(0, 0, "map");
Anyone have any ideas?
I copied the simplified code below as well if that helps.
var game = new Phaser.Game(window.innerWidth, window.innerHeight, Phaser.AUTO, '', { preload: preload, create: create, update: update });
function preload() {
game.load.image('map', 'assets/images/baseMap.png');
game.load.image('star', 'assets/images/star.png');
}
function create() {
// Creating the group
world = game.add.group();
world.create(0, 0, 'map');
// Adding random sprites to it
for (var i = 0; i < 10; i++)
{ world.create(game.world.randomX, game.world.randomY, 'star');}
//This group works on its own.
//I would like to link it to the dragging animation below "scrollingMap".
//The Draggable Map from the tutorial
// Adding the big map to scroll
this.scrollingMap = game.add.image(0, 0, "map"); //<-- This is where I am having trouble changing from an image to a group.
// map will accept inputs
this.scrollingMap.inputEnabled = true;
// map can be dragged
this.scrollingMap.input.enableDrag(false);
// custom property: we save map position
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
// custom property: the map is not being dragged at the moment
this.scrollingMap.isBeingDragged = false;
// custom property: map is not moving (or is moving at no speed)
this.scrollingMap.movingSpeed = 0;
// map can be dragged only if it entirely remains into this rectangle
this.scrollingMap.input.boundsRect = new Phaser.Rectangle(game.width - this.scrollingMap.width, game.height - this.scrollingMap.height, this.scrollingMap.width * 2 - game.width, this.scrollingMap.height * 2 - game.height);
// when the player starts dragging...
this.scrollingMap.events.onDragStart.add(function(){
this.scrollingMap.isBeingDragged = true;
// set movingSpeed property to zero. This will stop moving the map
// if the player wants to drag when it's already moving
this.scrollingMap.movingSpeed = 0;
}, this);
// when the player stops dragging...
this.scrollingMap.events.onDragStop.add(function(){
this.scrollingMap.isBeingDragged = false;
}, this);
} //End create function
function update() {
// if the map is being dragged...
if(this.scrollingMap.isBeingDragged){
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
}
// if the map is NOT being dragged...
else{
// if the moving speed is greater than 1...
if(this.scrollingMap.movingSpeed > 1){
this.scrollingMap.x += this.scrollingMap.movingSpeed * Math.cos(this.scrollingMap.movingangle);
this.scrollingMap.y += this.scrollingMap.movingSpeed * Math.sin(this.scrollingMap.movingangle);
if(this.scrollingMap.x < game.width - this.scrollingMap.width){
this.scrollingMap.x = game.width - this.scrollingMap.width;
}
if(this.scrollingMap.x > 0){
this.scrollingMap.x = 0;
}
if(this.scrollingMap.y < game.height - this.scrollingMap.height){
this.scrollingMap.y = game.height - this.scrollingMap.height;
}
if(this.scrollingMap.y > 0){
this.scrollingMap.y = 0;
}
this.scrollingMap.movingSpeed *= friction;
// save current map position
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
}
// if the moving speed is less than 1...
else{
var distance = this.scrollingMap.savedPosition.distance(this.scrollingMap.position);
var angle = this.scrollingMap.savedPosition.angle(this.scrollingMap.position);
if(distance > 4){
this.scrollingMap.movingSpeed = distance * speedMult;
this.scrollingMap.movingangle = angle;
}
}
}
}

So, I ended up finding the solution...
First off, I removed all this.scrollingMap and changed them to scrollingMap to remove any confusion. Ended up stil working perfectly.
scrollingMap = game.add.image(0, 0, "map");
scrollingMap.anchor.set(0.05,0.5);
scrollingMap.inputEnabled = true;
[etc...]
Next, Groups in Phaser don't seem to be able to have input working on elements together, only one at a time. So changing to something like wouldn't work:
scrollingMap = game.add.group();
map = game.add.image(0, 0, "map");
scrollingMap.add(map);
// The following line won't work
scrollingMap.inputEnabled = true;
I tried using the Align functions that Phaser offers... Until I ended up realising that you can actually nest sprites within other sprites like so:
scrollingMap = game.add.image(0, 0, "map");
someSprite = game.add.image(100, 100, "sprite");
scrollingMap.addChild(someSprite);
And voila! There's the solution, as simple as that.
Note that you can also add groups as children:
someGroup = game.add.group();
scrollingMap.addChild(someGroup);
Found the solution here if anyone's curious:
http://www.html5gamedevs.com/topic/7745-move-a-group-of-sprites-together-as-one-body/

Pixi.js keeps accelerating on page refresh

These are my references created in pixi.js here:
http://brekalo.info/en/reference
If we go to references it loads pixiJS and everything works fine on first load! Then, if we go to another page let's say: http://brekalo.info/en/contact, and the go back to references again - now my references have accelerated text movement and rotation and it keeps accelerate on each reference page load!
Here is my javascript/pixi code below:
function initiatePixi() {
Object.keys(PIXI.utils.TextureCache).forEach(function(texture) {
PIXI.utils.TextureCache[texture].destroy(true);}
);
// create an new instance of a pixi stage
var container = new PIXI.Container();
// create a renderer instance.
renderer = PIXI.autoDetectRenderer(frameWidth, frameHeight, transparent = false, antialias = true);
// set renderer frame background color
renderer.backgroundColor = 0xFFFFFF;
// add the renderer view element to the DOM
document.getElementById('pixi-frame').appendChild(renderer.view);
// create references
createReferences(animate); // callback to animate frame
function createReferences(callback) {
// Create text container
textContainer = new PIXI.Container();
textContainer.x = 0;
textContainer.y = 0;
for (i = 0; i < references.length; i++) {
var style = {
font:"22px Verdana",
fill:getRandomColor()
};
var text = new PIXI.Text(references[i], style);
text.x = getRandomInteger(20, 440); // text position x
text.y = getRandomInteger(20, 440); // text position y
text.anchor.set(0.5, 0.5); // set text anchor point to the center of text
text.rotation = getRandomInteger(0, rotationLockDeg) * 0.0174532925; // set text rotation
// make the text interactive
text.interactive = true;
// create urls on text click
text.on("click", function (e) {
var win = window.open("http://" + this.text, '_blank');
win.focus();
});
textContainer.addChild(text);
rotateText(); // rotate text each second
}
container.addChild(textContainer);
// callback
if (callback && typeof(callback) === "function") {
callback();
}
}
function animate() {
requestAnimationFrame(animate);
// render the stage
renderer.render(container);
}
function rotateText() {
var rotateTimer = setInterval(function () {
for (var key in textContainer.children) { // loop each text object
var text = textContainer.children[key];
if(text.rotation / 0.0174532925 < -rotationLockDeg || text.rotation / 0.0174532925 > rotationLockDeg) {
if(text.rotation / 0.0174532925 < -rotationLockDeg)
text.rotation = -rotationLockRad;
if(text.rotation / 0.0174532925 > rotationLockDeg)
text.rotation = rotationLockRad;
rotation = -rotation;
}
text.rotation += rotation; // rotate text by rotate speed in degree
if(text.x < 0 || text.x > 460)
dx = -dx;
if(text.y < 0 || text.y > 460)
dy = -dy;
text.x += dx;
text.y += dy;
}
}, 75);
}
// get random integer between given range (eg 1-10)
function getRandomInteger(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
// random hex color generator
function getRandomColor() {
var letters = '0123456789ABCDEF'.split('');
var color = '#';
for (var i = 0; i < 6; i++ ) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
Thanks in advance!
:: cheers ::
Josip

To expand #Cristy's comment to an answer:
The answer lies in the same reason as why your question title is wrong: There is indeed NO page refresh when doing what you describe. If there were, you wouldn't have that problem in the first place. Try it out, hit F5 a few times on you animated page, it will stay the same speed.
The reason is that you are running a angular based single page application, and only exchange the loaded view content on a route change. This does not stop your already running animation code from continuing to run in the background while you navigate to another view, so that when you return to the animated tab you will create another set of interval timers for your animation, which will result in more executions and thus a visually faster animation.

#Cristy thanks for the advice!
Here is how I manage to solve this..
I put one property in my pixi-parameters.js:
pixiWasLoaded = false;
Then, when I call initiatePixi() function, I set:
pixiWasLoaded = true;
Now in my controllers.js I have this piece of code:
.run( function($rootScope, $location, $window) {
$rootScope.$watch(function() {
return $location.path();
},
function(page){
if(page == "/hr/reference" || page == "/en/references"){
if($window.pixiWasLoaded)
$window.addRendererElementToDOM();
else
loadReferences();
}
});
});
It checks if references page is loaded and then uses $window to find my global variable "pixiWasLoaded" and if it's not loaded then it loads PixiJS using loadReferences() function.. and if is already loaded it calls my part of code to add render-view to DOM so my animate function can render it..
:: cheers ::
Josip

ActivePointer location not updating

I'm making a sidescroller using Phaser (latest version) and I want the player's projectiles to go towards the pointer when the player clicks, like they do in this example http://phaser.io/examples/v2/games/tanks. I've used some of the code from the example but in my game, the activePointer x and y co-ordinates seem to only initialise when the game starts and never change. So when the player shoots, it's always going towards the same co-ordinates.
I have the following code (note I have removed bits about item collection, enemies etc. for posting on here):
var SideScroller = SideScroller || {};
var startPosX = 100;
var startPosY = 300;
var shooter;
var playerBullets;
var nextFire = 0;
var fireRate = 100;
var cursors;
var currentLoc;
SideScroller.Game = function () {};
SideScroller.Game.prototype = {
create: function () {
//create player
//params = (game, startPositionX,startPositionY, key, frame)
this.player = this.game.add.sprite(startPosX, startPosY, 'player');
//get canvas width and height for later use
canvasWidth = this.game.canvas.width;
canvasHeight = this.game.canvas.height;
//create enemy
var x = this.game.rnd.between(80, this.game.world.width);
var y = this.game.rnd.between(0, 113);
// Point to shoot projectiles from
// allows rotation, if this had been done on the player object, the graphic would have rotated, which we don't want
this.shooter = this.game.add.sprite(startPosX, startPosY, 'blank');
this.shooter.anchor.setTo(0.5, 0.5);
//make a group of player projectiles
playerBullets = this.game.add.group();
playerBullets.enableBody = true;
playerBullets.physicsBodyType = Phaser.Physics.ARCADE;
playerBullets.createMultiple(1000, 'peePower');
playerBullets.setAll('anchor.x', 0.5);
playerBullets.setAll('anchor.y', 0.5);
playerBullets.setAll('outOfBoundsKill', true);
playerBullets.setAll('checkWorldBounds', true);
//enable physics on the player
this.game.physics.arcade.enable(this.player);
//bring player shooting point to the top (not totally necessary)
this.shooter.bringToTop();
//player gravity
this.player.body.gravity.y = gravity;
//player collides with all four edges of the game world
this.player.body.collideWorldBounds = true;
this.player.anchor.setTo(0.5, 0.5);
//the camera will follow the player in the world
this.game.camera.follow(this.player);
//move player with cursor keys
cursors = this.game.input.keyboard.createCursorKeys();
},
update: function () {
currentLoc = this.game.input.activePointer;
//collision between player and platforms
this.game.physics.arcade.collide(this.player, this.blockedLayer, null, null, this);
//make co-ordinates match
this.shooter.x = this.player.x;
this.shooter.y = this.player.y;
//this.shooter's angle towards
this.shooter.rotation = this.game.physics.arcade.angleToPointer(this.shooter, this.game.input.activePointer);
//only respond to keys if the player is alive
if (this.player.alive) {
this.player.body.velocity.x = 0;
if (this.game.input.activePointer.isDown) {
console.log("pointer is down");
this.fire();
}
else if (cursors.right.isDown) {
this.playerForward();
}
else if (cursors.left.isDown) {
this.playerBack();
}
else if (cursors.up.isDown) {
this.playerJump();
}
else if (cursors.down.isDown) {
this.fire();
this.playerDuck();
}
}
},
fire: function () {
//for debugging
console.log("fire was called");
console.log(this.game.input.activePointer.x);
console.log(this.game.input.activePointer.y);
if (this.game.time.now > nextFire && playerBullets.countDead() > 0)
{
nextFire = this.game.time.now + fireRate;
var bullet = playerBullets.getFirstExists(false);
bullet.reset(this.shooter.x, this.shooter.y);
currentLoc = this.game.input.activePointer;
bullet.rotation = this.game.physics.arcade.moveToPointer(bullet, 1000, currentLoc, 1000);
console.log(this.game.input.activePointer);
}
},
playerForward: function () {
this.player.loadTexture('player');
this.player.body.setSize(this.player.standDimensions.width, this.player.standDimensions.height);
this.player.body.velocity.x = 700;
this.player.isMoving = true;
//console.log("Forward height:" + this.player.standDimensions.height);
//console.log("Forward width:" + this.player.standDimensions.width);
},
playerBack: function () {
this.player.loadTexture('playerBack');
this.player.body.velocity.x -= 700;
this.player.isMoving = true;
},
playerJump: function () {
if (this.player.body.blocked.down) {
this.player.body.velocity.y -= 700;
this.player.loadTexture('playerJump');
//console.log("Jump height:" + this.player.jumpDimensions.height);
//console.log("Jump width:" + this.player.jumpDimensions.width);
}
},
playerDuck: function () {
//change image and update the body size for the physics engine
this.player.loadTexture('playerDuck');
this.player.body.setSize(this.player.duckedDimensions.width, this.player.duckedDimensions.height);
//keep track of whether player is ducked or not
this.player.isDucked = true;
},
playerDead: function () {
//set to dead (this doesn't affect rendering)
this.player.alive = false;
//stop moving to the right
this.player.body.velocity.x = 0;
//change sprite image
this.player.loadTexture('playerDead');
},
};
Shooter is a blank sprite on top of the player (much like the turret in the tank example) to allow for rotation without the player rotating (please let me know also if there's a better way to do that!).
I tried updating the currentLoc variable in the update method to the activePointer location but that didn't work.
In addition, this condition has never been hit:
if (this.game.input.activePointer.isDown) {
console.log("pointer is down");
this.fire();
}
So something must be going awry with detecting mouse clicks and I don't know if that's part of the problem?

I think you should look it up in the API. There are few points in your code that are questionable.
http://phaser.io/docs/2.3.0/Phaser.Pointer.html
http://phaser.io/docs/2.3.0/Phaser.Physics.Arcade.html#moveToPointer
The point is that you are actually giving the reference to the pointer (to currentLoc) but not the position. So it should always fire to 0;0.
And for the isDown detection, have you done it in the update function or somewhere else?
Hope i could help!