Rotating and scaling pictures in flash is easy. Just use _rotation, _xscale and _yscale. Except when you publish an swf for Flash Player 8 or newer. Every image you rotate or scale will become jagged. Very anoying. To remedy this you can either publish for Flash 7 or use a complicated loadBitmapSmoothed function that uses BitmapData.
When Flash Player 8.5 came out it introduced the forceSmoothing property. This property is also available in as2. Now all we need to do is set it to true when we load images. Don’t forget that this will have no effect in Flash players older than version 8.5!
It works quite well. In the example below you can clearly see the left picture is more jagged than the right one.