var Velocity = { setVelocityX: function (x) { this.vel.x = x; return this; }, setVelocityY: function (y) { this.vel.y = y; return this; }, setVelocity: function (x, y) { if (y === undefined) { y = x; } this.vel.x = x; this.vel.y = y; return this; }, setMaxVelocity: function (x, y) { if (y === undefined) { y = x; } this.maxVel.x = x; this.maxVel.y = y; return this; } }; module.exports = Velocity;