Source: ArrowHead.js

/**
 * the head of an arrow
 * @param {number} rotation - angle
 * @param {number} posX - x coordinate
 * @param {number} posY - y coordinate
 * @constructor
 */
var ArrowHead = function (rotation, posX, posY) {
	this.rotation = rotation;
	this.posX = posX;
	this.posY = posY;
}