package
{
    import com.rtl.FastMath;
    import com.rtl.Vector2D;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Point;

    /**
     * @author RTLShadow
     */
    public class SunRay extends Sprite
    {
        static public const ORIGIN:Point = new Point( 0, 0 );

        private var startA:Number;
        private var endA:Number;

        private var startV:Vector2D;
        private var endV:Vector2D;

        public function SunRay( startAngle:Number, endAngle:Number )
        {
            addEventListener( Event.ADDED_TO_STAGE, init );
            startA = startAngle;
            endA = endAngle;
        }

        private function init( e:Event ):void
        {
            removeEventListener( Event.ADDED_TO_STAGE, init );

            draw();
        }

        private function draw():void
        {
            var dist:Number = findDistance( x, y );
            startV = new Vector2D( dist, startA )
            endV = new Vector2D( dist, endA );

            graphics.clear();
            graphics.beginFill( 0xFFFF00, 1 );
            graphics.lineTo( startV.addToPoint( new Point( 0, 0 ) ).x, startV.addToPoint( new Point( 0, 0 ) ).y );
            graphics.lineTo( endV.addToPoint( new Point( 0, 0 ) ).x, endV.addToPoint( new Point( 0, 0 ) ).y );
            graphics.lineTo( 0, 0 );
            graphics.endFill();
        }

        public override function set x( newX:Number ):void
        {
            super.x = newX;
            draw();
        }

        public override function set y( newY:Number ):void
        {
            super.y = newY;
            draw();
        }

        public function get startAngle():Number
        {
            return startA;
        }

        public function set startAngle( sA:Number ):void
        {
            startA = sA;
            startV.angle = startA;
            draw();
        }

        public function get endAngle():Number
        {
            return endA;
        }

        public function set endAngle( eA:Number ):void
        {
            endA = eA;
            endV.angle = endA;
            draw();
        }

        private function findDistance( x:Number, y:Number ):Number
        {
            var dist1:Number = FastMath.calculateDistance( x, y, 0, 0 );
            var dist2:Number = FastMath.calculateDistance( x, y, stage.stageWidth, 0 );
            var dist3:Number = FastMath.calculateDistance( x, y, stage.stageWidth, stage.stageHeight );
            var dist4:Number = FastMath.calculateDistance( x, y, 0, stage.stageHeight );
            return FastMath.largestNum([ dist1, dist2, dist3, dist4 ] );
        }

    }

}