package {
    import flash.display.*;
    import flash.geom.*;
    import flash.filters.DisplacementMapFilter;
    import flash.utils.setInterval;
    import com.google.maps.*;

    [SWF(backgroundColor="0x000000")]
    public class GoogleEarthAs3_2 extends Sprite {
        private const WIDTH:int = 800;
        private const HEIGHT:int = 500;
        private const RADIUS:int = 81;
        private var map:Map;

        public function GoogleEarthAs3_2() {
            stage.scaleMode = "noScale";
            stage.align = "TL";

            map = new Map();
            map.key = "ABQIAAAA6de2NwhEAYfH7t7oAYcX3xRWPxFShKMZYAUclLzloAj2mNQgoRQZnk8BRyG0g_m2di3bWaT-Ji54Lg";
            map.setSize(new Point(800, 500));
            map.addEventListener(MapEvent.MAP_READY, function(event:*):void{
                var lng:Number = 0;
                var types:Array = [MapType.SATELLITE_MAP_TYPE, MapType.PHYSICAL_MAP_TYPE, MapType.NORMAL_MAP_TYPE];
                var type:int = 0;
                map.setCenter(new LatLng(0, lng), 1, types[0]);
                map.disableDragging();

                setInterval(function():void
                {
                    lng -= 3;
                    type = Math.random() < 0.05 ? (type + 1) % 3 : type;
                    map.setCenter(new LatLng(0, lng), 1, types[type]);
                    lng = lng % 360;
                }, 200);
            });

            var bmd:BitmapData = new BitmapData(WIDTH, HEIGHT, false, 0);
            for(var j:int = 0; j < RADIUS * 2; j++){
                var ay:Number = Math.PI / 2 - Math.acos(1 - j / RADIUS);
                var dy:Number = RADIUS - j - RADIUS * ay;
                var rx:Number = RADIUS * Math.cos(ay);
                for(var i:int = RADIUS - rx; i < RADIUS + rx; i++){
                    var ax:Number = Math.PI / 2 - Math.acos(1 - (i - RADIUS + rx) / rx);
                    var dx:Number = RADIUS - i - rx * ax;

                    bmd.setPixel(i, j, getColor(dx * 3 + 128, dy * 3 + 128, 128));
                }
            }

            var diff:Number = (HEIGHT - 2 * RADIUS) / 2;
            map.filters = [new DisplacementMapFilter(bmd, new Point(diff, diff), 1, 2, 128, 128)];
            var matrix:Matrix = new Matrix();
            matrix.translate(-diff, -diff);
            map.transform.matrix = matrix;
            addChild(map);

            var msk:Sprite = new Sprite();
            msk.graphics.beginFill(0);
            msk.graphics.drawCircle(RADIUS, RADIUS, RADIUS);
            msk.graphics.endFill();
            addChild(msk);
            mask = msk;
        }

        private static function getColor(r:int, g:int, b:int):uint {
            return r * 0x10000 + g * 0x100 + b;
        }
    }
}