mousemovement.js

mousemovement.js

// Dumping old code as gists...

(function($) {
	$.mouseMovement = {
		stack: [],
		clearInterval: 1000
	};

	var stack = $.mouseMovement.stack;

	/*
	 * Point
	 * -------------------------
	 */
	var Point = function( x, y, t ) {
		this.x = x;
		this.y = y;
		this.t = t || $.now();
	}
	Point.fromEvent = function( e ) {
		return new Point( e.pageX, e.pageY, e.timeStamp );
	};

	/*
	 * ANGLE
	 * -------------------------
	 */
	var Angle = function( val ) {
		this.val = val;
	};
	$.extend( Angle, {
		fromVector: function( vector ) {
			return (new Angle( Math.atan2( vector.y, vector.x ) )).normalize();
		},
		fromDeg: function( deg ) {
			return new Angle( Math.PI / 180 * deg );
		}
	});
	Angle.prototype = {
		MOD_CIRCLE: 2 * Math.PI,
		normalize: function() {
			this.val = (this.val + this.MOD_CIRCLE) % this.MOD_CIRCLE;
			return this;
		},
		isOpposite: function( angle, boundingInterval ) {
			var min = (new Angle( angle.val + Math.PI - boundingInterval / 2 )).normalize(),
				max = (new Angle( angle.val + Math.PI + boundingInterval / 2 )).normalize();

			return this.normalize().val >= min.val && this.val <= max.val;
		},
		toDeg: function() {
			return 180 / Math.PI * this.val;
		}
	};

	/*
	 * Vector
	 * -------------------------
	 */
	var Vector = function( p1, p2 ) {
		if ( p1 && p2 ) {
			this.p1 = p1;
			this.p2 = p2;

			// Delta Time, X, Y -> calculate!.
			this.diff( 't' ).diff( 'x' ).diff( 'y' ).calc();
		}
	};
	Vector.prototype = {
		add: function( vector ) {
			this.x = (this.x || 0) + vector.x;
			this.y = (this.y || 0) + vector.y;
			this.t = (this.t || 0) + vector.t;

			return this;
		},
		calc: function() {
			// The total distance (delta S, hypotenuse) - this is the total distance in scalar form.
			this.length = Math.sqrt( Math.pow( this.x, 2 ) + Math.pow( this.y, 2 ) );

			// Angle in radians.
			this.angle = Angle.fromVector( this );

			return this;
		},
		diff: function( prop ) {
			this[prop] = this.p1[prop] - this.p2[prop];
			return this;
		}
	};

	$( document ).mousemove(function( e ) {

		// Add to stack.
		stack.push( Point.fromEvent( e ) );

		var length = stack.length, i = length - 1,
			first = stack[i],
			vector = new Vector, add,
			quadrant = Math.PI / 2;

		for ( ; i > -1; i-- ) {

			if ( i === 0 /* last one ( captures first if it's alone ), or: */ || (
					// time diff between i & first too long, or:
					stack[i].t < first.t - $.mouseMovement.clearInterval ||
					// {add} is within the opposite quadrant of {vector}.
					(add = new Vector( stack[i], stack[i - 1] )) && vector.angle && vector.angle.isOpposite( Angle.fromVector( add ), quadrant )
				) && stack.splice( 0, i + 1 )
			) {
				// Match! Avoid vector-addition;
				break;
			}

			vector.add( add ).calc();
		}

		console.log( vector.angle ? [Math.round( vector.angle.toDeg() ), vector] : false );
	});

})(jQuery);