draw/fill as3 BimapData test

package
{
    import flash.text.TextFieldAutoSize;
    import flash.text.TextField;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    /**
     * @author perry
     */
    public class Main extends Sprite
    {
        private var bmpd:BitmapData;
        private var canvas:Bitmap;

        private var drawColor:int = 0xff0000;
        private var fillColor:int = 0x00ffff;

        private var drawing:Boolean;

        public function Main()
        {
            init();
        }

        private function init():void
        {
            bmpd = new BitmapData( stage.stageWidth, stage.stageHeight, false, 0x00ff00 );
            canvas = new Bitmap( bmpd );
            this.addChild( canvas );

            var hitAreas:Sprite = new Sprite();
            hitAreas.graphics.beginFill( 0x0000ff, 0 );
            hitAreas.graphics.drawRect( 0, 0, canvas.width, canvas.height );
            addChild( hitAreas );

            addButtons();

            drawing = true;

            hitAreas.addEventListener( MouseEvent.MOUSE_DOWN, startDrawing );
            hitAreas.addEventListener( MouseEvent.MOUSE_UP, stopDrawing );
        }

        private function addButtons():void
        {
            var pencil:Sprite = new Sprite();
            var fill:Sprite = new Sprite();

            var ptf:TextField = new TextField();
            ptf.autoSize = TextFieldAutoSize.LEFT;
            ptf.selectable = false;
            ptf.text = "DRAW";
            pencil.addChild(ptf);

            var ftf:TextField = new TextField();
            ftf.autoSize = TextFieldAutoSize.LEFT;
            ftf.text = "FILL";
            ptf.selectable = false;
            fill.addChild(ftf);

            pencil.graphics.beginFill( 0x888888);
            pencil.graphics.drawRect(0, 0, ptf.width + 5, ptf.height + 5);
            pencil.graphics.endFill();

            fill.graphics.beginFill( 0x888888);
            fill.graphics.drawRect(0, 0, ftf.width + 5, ftf.height + 5);
            fill.graphics.endFill();

            addChild( pencil);
            fill.y = pencil.height + 10;
            addChild(fill);

            pencil.buttonMode = true;
            fill.buttonMode = true;

            pencil.addEventListener(MouseEvent.MOUSE_DOWN, pencilDownHandler );
            fill.addEventListener(MouseEvent.MOUSE_DOWN, fillDownHandler );
        }

        private function startDrawing( e:MouseEvent ):void
        {
            if(drawing)
                stage.addEventListener( Event.ENTER_FRAME, loop );
            else
            {
                bmpd.floodFill(mouseX, mouseY, fillColor);
                canvas.bitmapData = bmpd;
            }
        }

        private function stopDrawing( e:MouseEvent ):void
        {
            if(drawing)
                stage.removeEventListener( Event.ENTER_FRAME, loop );
        }

        private function pencilDownHandler( e:MouseEvent ):void
        {
            drawing = true;
        }

        private function fillDownHandler( e:MouseEvent ):void
        {
            drawing = false;
        }

        private function loop( e:Event ):void
        {
            bmpd.setPixel(mouseX, mouseY, drawColor );
            bmpd.setPixel(mouseX+1, mouseY, drawColor );
            bmpd.setPixel(mouseX+1, mouseY+1, drawColor );
            bmpd.setPixel(mouseX, mouseY+1, drawColor );

            canvas.bitmapData = bmpd;
        }
    }
}