Appcelerator Titanium touch events example. Connects the blue box to the red box with touch and finger slide. The windows backgroundColor and the Label will give action feedback to the user. Or how to take advantage of pointInWindowCoords() to keep things simple.

Ti-touches-kiss.js

/***
 * Connects the blue box to the red box with touch and finger slide. 
 * The window's backgroundColor and label's text will give action feedback to the user.
 * Or how to take advantage of convertPointToView() to keep things simple
 * 
 * @Copyleft 2013 Patrick De Marta 
 * @License GNU GPL
 */

/**
 * The blue box
 */
var objectA = Ti.UI.createView({
	backgroundColor:"blue",
	width:100,
	height:100,
	top: 50
});

/**
 * The red box
 */
var objectB = Ti.UI.createView({
	backgroundColor:"red",
	width:100,
	height:100,
	bottom: 50
});
var collidedWithB = false; // flag the collision with red box 

/**
 * Label for textual feedback
 */
var label = Ti.UI.createLabel({
	text:"Touch the blue box",
	font:{fontSize:18},
	color:"yellow"
});

/**
 * The main window
 */
var win = Ti.UI.createWindow({
	backgroundColor:"black"
});

/**
 * EventListeners
 *
 *
 * Touch start
 */
objectA.addEventListener('touchstart', function(){
	win.backgroundColor = "yellow";
	label.color="black";
	label.text = "Slide your finger to the red box";
});


/** 
 * Touch move
 * If finger is over the red objectB box,
 * rise the collision flag and give feedback!
 */
objectA.addEventListener('touchmove',function(e){
	if (fingerSlideCollider(objectA, objectB, e)) {
		win.backgroundColor = "green";
		collidedWithB = true;
		label.text = "You connected the blue to the red box";
	}
});

/** 
 * Touch end
 * If finger left before getting to the red box, reset the UI.
 * Anyway drop the eventually raised collision flag.
 */
objectA.addEventListener('touchend', function(){
	if (!collidedWithB) {
		win.backgroundColor = "black";
		label.color = "yellow";
		label.text = "Touch the blue box";
	}
	collidedWithB = false;
});


/**
 * Check if the touch position is over the area of an object,
 * use convertPointToView() to translate the coords originated by objectA touchMove
 * into the target objectB coords system.
 * It's easy then to check if touch falls inside the target object display area,
 * meaning that the collision occured.
 */
function fingerSlideCollider(originObj, targetObj, e){
    var pointRelativeToTarget = originObj.convertPointToView({x:e.x, y:e.y}, targetObj),
	x = pointRelativeToTarget.x,
	y = pointRelativeToTarget.y,
	onX = (x > 0) && (x < targetObj.rect.width),
	onY = (y > 0 ) && (y < targetObj.rect.height);
    return (onX && onY);	
};

/**
 * Add everything to the window and open it.
 */
win.add(objectA);
win.add(objectB);
win.add(label);

win.open();