How to extract the shape of MovieClip?-Collection of common programming errors

If you want to export the shape coordinates at author time, you can do try the JSFL script recommented by @strille or this one or export transparent images (if that’s not too limiting for your application).

If you need to export the shapes at runtime, you can use the awesome as3swf library to decompile the swf and export the shapes. Have a look at the ShapeExport wiki as there are couple of handy exporters for js like JSCanvasShapeExporter and the more generic JSONShapeExporter