signal.js

// Signal extends THREE.Vector3 ----------------------------------------------------------------

function Signal( particlePool, minSpeed, maxSpeed ) {

	this.minSpeed = minSpeed;
	this.maxSpeed = maxSpeed;
	this.speed = THREE.Math.randFloat( this.minSpeed, this.maxSpeed );
	this.alive = true;
	this.t = null;
	this.startingPoint = null;
	this.axon = null;
	this.particle = particlePool.getParticle();
	THREE.Vector3.call( this );

}

Signal.prototype = Object.create( THREE.Vector3.prototype );

Signal.prototype.setConnection = function ( Connection ) {

	this.startingPoint = Connection.startingPoint;
	this.axon = Connection.axon;
	if ( this.startingPoint === 'A' ) this.t = 0;
	else if ( this.startingPoint === 'B' ) this.t = 1;

};

Signal.prototype.travel = function ( deltaTime ) {

	var pos;
	if ( this.startingPoint === 'A' ) {
		this.t += this.speed * deltaTime;
		if ( this.t >= 1 ) {
			this.t = 1;
			this.alive = false;
			this.axon.neuronB.receivedSignal = true;
			this.axon.neuronB.prevReleaseAxon = this.axon;
		}

	} else if ( this.startingPoint === 'B' ) {
		this.t -= this.speed * deltaTime;
		if ( this.t <= 0 ) {
			this.t = 0;
			this.alive = false;
			this.axon.neuronA.receivedSignal = true;
			this.axon.neuronA.prevReleaseAxon = this.axon;
		}
	}

	pos = this.axon.getPoint( this.t );
	// pos = this.axon.getPointAt(this.t);	// uniform point distribution but slower calculation

	this.particle.set( pos.x, pos.y, pos.z );

};