(function (window) {
  
          function Ship() {
                  this.initialize();
          }
  
          var p = Ship.prototype = new createjs.Container();
  
  // public properties:
          Ship.TOGGLE = 60;
          Ship.MAX_THRUST = 2;
          Ship.MAX_VELOCITY = 5;
  
  // public properties:
          p.shipFlame;
          p.shipBody;
  
          p.timeout;
          p.thrust;
  
          p.vX;
          p.vY;
  
          p.bounds;
          p.hit;
  
  // constructor:
          p.Container_initialize = p.initialize;        //unique to avoid overiding base class
  
          p.initialize = function () {
                  this.Container_initialize();
  
                  this.shipFlame = new createjs.Shape();
                  this.shipBody = new createjs.Shape();
  
                  this.addChild(this.shipFlame);
                  this.addChild(this.shipBody);
  
                  this.makeShape();
                  this.timeout = 0;
                  this.thrust = 0;
                  this.vX = 0;
                  this.vY = 0;
          }
  
  // public methods:
          p.makeShape = function () {
                  //draw ship body
                  var g = this.shipBody.graphics;
                  g.clear();
                  g.beginStroke("#FFFFFF");
  
                  g.moveTo(0, 10);        //nose
                  g.lineTo(5, -6);        //rfin
                  g.lineTo(0, -2);        //notch
                  g.lineTo(-5, -6);        //lfin
                  g.closePath(); // nose
  
                  //draw ship flame
                  var o = this.shipFlame;
                  o.scaleX = 0.5;
                  o.scaleY = 0.5;
                  o.y = -5;
  
                  g = o.graphics;
                  g.clear();
                  g.beginStroke("#FFFFFF");
  
                  g.moveTo(2, 0);                //ship
                  g.lineTo(4, -3);        //rpoint
                  g.lineTo(2, -2);        //rnotch
                  g.lineTo(0, -5);        //tip
                  g.lineTo(-2, -2);        //lnotch
                  g.lineTo(-4, -3);        //lpoint
                  g.lineTo(-2, -0);        //ship
  
                  //furthest visual element
                  this.bounds = 10;
                  this.hit = this.bounds;
          }
  
          p.tick = function (event) {
                  //move by velocity
                  this.x += this.vX;
                  this.y += this.vY;
  
                  //with thrust flicker a flame every Ship.TOGGLE frames, attenuate thrust
                  if (this.thrust > 0) {
                          this.timeout++;
                          this.shipFlame.alpha = 1;
  
                          if (this.timeout > Ship.TOGGLE) {
                                  this.timeout = 0;
                                  if (this.shipFlame.scaleX == 1) {
                                          this.shipFlame.scaleX = 0.5;
                                          this.shipFlame.scaleY = 0.5;
                                  } else {
                                          this.shipFlame.scaleX = 1;
                                          this.shipFlame.scaleY = 1;
                                  }
                          }
                          this.thrust -= 0.5;
                  } else {
                          this.shipFlame.alpha = 0;
                          this.thrust = 0;
                  }
          }
  
          p.accelerate = function () {
                  //increase push ammount for acceleration
                  this.thrust += this.thrust + 0.6;
                  if (this.thrust >= Ship.MAX_THRUST) {
                          this.thrust = Ship.MAX_THRUST;
                  }
  
                  //accelerate
                  this.vX += Math.sin(this.rotation * (Math.PI / -180)) * this.thrust;
                  this.vY += Math.cos(this.rotation * (Math.PI / -180)) * this.thrust;
  
                  //cap max speeds
                  this.vX = Math.min(Ship.MAX_VELOCITY, Math.max(-Ship.MAX_VELOCITY, this.vX));
                  this.vY = Math.min(Ship.MAX_VELOCITY, Math.max(-Ship.MAX_VELOCITY, this.vY));
          }
  
          window.Ship = Ship;
  
  }(window));