Ejemplo: Proyección en perspectiva

1. Se crea el objeto objeto denominado center, como un círculo con cruz.

2. Asigna la coordenadas del objeto Sprite center a la propiedadprojectionCenter de la propiedad perspectiveProjection de transform de la raíz.

3. Se añaden detectores de eventos para eventos de ratón que llaman a controladores que modifican el componente projectionCenter de forma que éste siga la ubicación del objeto center.

4. Se crean cuatro cuadros de estilo Accordion que forman las paredes del espacio en perspectiva.

package 
{ 
    import flash.display.Sprite; 
    import flash.display.Shape; 
    import flash.geom.Point; 
    import flash.events.*; 
    public class ProjectionDragger extends Sprite 
    { 
        private var center : Sprite; 
        private var boxPanel:Shape; 
        private var inDrag:Boolean = false; 
         
         public function ProjectionDragger():void 
        { 
            createBoxes(); 
            createCenter(); 
        }  
         public function createCenter():void 
         {   
              var  centerRadius:int = 20; 
     
              center = new Sprite(); 
     
              // circle 
              center.graphics.lineStyle(1, 0x000099); 
              center.graphics.beginFill(0xCCCCCC, 0.5); 
              center.graphics.drawCircle(0, 0, centerRadius); 
              center.graphics.endFill(); 
              // cross hairs 
              center.graphics.moveTo(0, centerRadius); 
              center.graphics.lineTo(0, -centerRadius); 
              center.graphics.moveTo(centerRadius, 0); 
              center.graphics.lineTo(-centerRadius, 0); 
              center.x = 175; 
              center.y = 175; 
              center.z = 0; 
              this.addChild(center); 
     
              center.addEventListener(MouseEvent.MOUSE_DOWN, startDragProjectionCenter); 
              center.addEventListener(MouseEvent.MOUSE_UP, stopDragProjectionCenter); 
              center.addEventListener( MouseEvent.MOUSE_MOVE, doDragProjectionCenter); 
              root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); 
        } 
        public function createBoxes():void 
        { 
            // createBoxPanel(); 
            var boxWidth:int = 50; 
            var boxHeight:int = 50; 
            var numLayers:int = 12; 
            var depthPerLayer:int = 50; 
             
            // var boxVec:Vector.<Shape> = new Vector.<Shape>(numLayers); 
            for (var i:int = 0; i < numLayers; i++) 
            { 
                this.addChild(createBox(150, 50, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xCCCCFF)); 
                this.addChild(createBox(50, 150, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xFFCCCC)); 
                this.addChild(createBox(250, 150, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xCCFFCC)); 
                this.addChild(createBox(150, 250, (numLayers - i) * depthPerLayer, boxWidth, boxHeight, 0xDDDDDD)); 
            } 
        } 
         
        public function createBox(xPos:int = 0, yPos:int = 0, zPos:int = 100, w:int = 50, h:int = 50, color:int = 0xDDDDDD):Shape 
        { 
            var box:Shape = new Shape(); 
            box.graphics.lineStyle(2, 0x666666); 
            box.graphics.beginFill(color, 1.0); 
            box.graphics.drawRect(0, 0, w, h); 
            box.graphics.endFill(); 
            box.x = xPos; 
            box.y = yPos; 
            box.z = zPos; 
            return box; 
        } 
        public function startDragProjectionCenter(e:Event)  
        {  
            center.startDrag(); 
            inDrag = true; 
        } 
         
        public function doDragProjectionCenter(e:Event)  
        {  
            if (inDrag) 
            { 
                root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); 
            } 
        } 
         
        public function stopDragProjectionCenter(e:Event) 
        { 
            center.stopDrag();  
            root.transform.perspectiveProjection.projectionCenter = new Point(center.x, center.y); 
            inDrag = false; 
        } 
    } 
}