// forked from http://wonderfl.net/c/kAfX/

package {

    import flash.display.*;

    import flash.events.*;

    [SWF(width="465", height="465", backgroundColor="0", frameRate="30")]

    public class PointLightDemo extends Sprite {

        private var fx:VolumetricPointLight;

        private var grid:Grid = new Grid;

        private var sun:SunIcon = new SunIcon;

        public function PointLightDemo():void {

            addEventListener(Event.ADDED_TO_STAGE, init);

            if(null != stage) init();

        }

        private function init(e:Event = null):void {

            removeEventListener(Event.ADDED_TO_STAGE, init);

            stage.quality = "medium";

            stage.align = "TL";

            stage.scaleMode = "noScale";

            // Create a VolumetricPointLight object, use the grid as the occlusion object.

            fx = new VolumetricPointLight(800, 600, grid, [0xc08040, 0x4080c0, 0], [1, 1, 1], [0, 20, 30]);

            // You can also specify a single color instead of gradient params, for example:

            //   fx = new VolumetricPointLight(800, 600, grid, 0xc08040);

            // is equivalent to:

            //   fx = new VolumetricPointLight(800, 600, grid, [0xc08040, 0], [1, 1], [0, 255]);

            addChild(fx);

            // Render on every frame.

            fx.startRendering();

            onResize(null);

            stage.addEventListener(Event.RESIZE, onResize);

            // Sun icon used to control light source position

            addChild(sun);

            sun.buttonMode = true;

            sun.addEventListener(MouseEvent.MOUSE_DOWN, function(e:Event):void { sun.startDrag(); });

            sun.addEventListener(MouseEvent.MOUSE_UP, function(e:Event):void { sun.stopDrag(); });

            addEventListener(Event.ENTER_FRAME, function(..._):void { fx.srcX = sun.x; fx.srcY = sun.y; });