package {
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.events.Event;
          import flash.events.KeyboardEvent;
          import flash.ui.Keyboard;
  
          public class @ax-animation-ch16-MovingCube extends Sprite
          {
                  private var points:Array;
                  private var triangles:Array;
                  private var fl:Number = 250;
                  private var vpX:Number = stage.stageWidth / 2;
                  private var vpY:Number = stage.stageHeight / 2;
                  private var offsetX:Number = 0;
                  private var offsetY:Number = 0;
                  
                  public function @ax-animation-ch16-MovingCube()
                  {
                          init();
                  }
                  
                  private function init():void
                  {
                          stage.align = StageAlign.TOP_LEFT;
                          stage.scaleMode = StageScaleMode.NO_SCALE;
                          
                          points = new Array();
                          // front four corners
                          points[0] = new animation_ch16_Point3D(-100, -100, -100);
                          points[1] = new animation_ch16_Point3D( 100, -100, -100);
                          points[2] = new animation_ch16_Point3D( 100,  100, -100);
                          points[3] = new animation_ch16_Point3D(-100,  100, -100);
                          // back four corners
                          points[4] = new animation_ch16_Point3D(-100, -100,  100);
                          points[5] = new animation_ch16_Point3D( 100, -100,  100);
                          points[6] = new animation_ch16_Point3D( 100,  100,  100);
                          points[7] = new animation_ch16_Point3D(-100,  100,  100);
                          for(var i:uint = 0; i < points.length; i++)
                          {
                                  points[i].setVanishingPoint(vpX, vpY);
                                  points[i].setCenter(0, 0, 200);
                          }
                          
                          triangles = new Array();
                          // front
                          triangles[0] = new animation_ch16_Triangle(points[0], points[1], points[2], 0x6666cc);
                          triangles[1] = new animation_ch16_Triangle(points[0], points[2], points[3], 0x6666cc);
                          // top
                          triangles[2] = new animation_ch16_Triangle(points[0], points[5], points[1], 0x66cc66);
                          triangles[3] = new animation_ch16_Triangle(points[0], points[4], points[5], 0x66cc66);
                          //back
                          triangles[4] = new animation_ch16_Triangle(points[4], points[6], points[5], 0xcc6666);
                          triangles[5] = new animation_ch16_Triangle(points[4], points[7], points[6], 0xcc6666);
                          // bottom
                          triangles[6] = new animation_ch16_Triangle(points[3], points[2], points[6], 0xcc66cc);
                          triangles[7] = new animation_ch16_Triangle(points[3], points[6], points[7], 0xcc66cc);
                          // right
                          triangles[8] = new animation_ch16_Triangle(points[1], points[5], points[6], 0x66cccc);
                          triangles[9] = new animation_ch16_Triangle(points[1], points[6], points[2], 0x66cccc);
                          // left
                          triangles[10] = new animation_ch16_Triangle(points[4], points[0], points[3], 0xcccc66);
                          triangles[11] = new animation_ch16_Triangle(points[4], points[3], points[7], 0xcccc66);
                          addEventListener(Event.ENTER_FRAME, onEnterFrame);
                          stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
                  }
                  
                  private function onEnterFrame(event:Event):void
                  {
                          var angleX:Number = (mouseY - vpY) * .001;
                          var angleY:Number = (mouseX - vpX) * .001;
                          for(var i:uint = 0; i < points.length; i++)
                          {
                                  var point:animation_ch16_Point3D = points[i];
                                  point.rotateX(angleX);
                                  point.rotateY(angleY);
                          }
                          
                          graphics.clear();
                          for(i = 0; i < triangles.length; i++)
                          {
                                  triangles[i].draw(graphics);
                          }
                  }
                  
                  private function onKeyDown(event:KeyboardEvent):void
                  {
                          if(event.keyCode == Keyboard.LEFT)
                          {
                                  offsetX -= 5;
                          }
                          else if(event.keyCode == Keyboard.RIGHT)
                          {
                                  offsetX += 5;
                          }
                          else if(event.keyCode == Keyboard.UP)
                          {
                                  offsetY -= 5;
                          }
                          else if(event.keyCode == Keyboard.DOWN)
                          {
                                  offsetY += 5;
                          }
                          for(var i:Number = 0; i < points.length; i++)
                          {
                                  points[i].setCenter(offsetX, offsetY, 200);
                          }
                  }
          }
  }