Flash CS3 Documentation

Learning ActionScript 2.0 in Adobe Flash > Animation, Filters, and Drawings > Using filter effects > About hit detection, rotating, skewing, and scaling filters

About hit detection, rotating, skewing, and scaling filters

No filtered region (drop shadow, for example) outside of a movie clip instance's bounding box rectangle is considered to be part of the surface for hit detection purposes (determining if an instance overlaps or intersects with another instance). Because hit detection is vector-based, you cannot perform a hit detection on the bitmap result. For example, if you apply a bevel filter to a button instance, hit detection is not available on the beveled portion of the instance.

Scaling, rotating, and skewing are not supported by filters; if the instance itself is scaled (_xscale and _yscale are not 100%), the filter effect does not scale with the instance. This means that the original shape of the instance rotates, scales, or skews; however, the filter does not rotate, scale, or skew with the instance.

You can animate an instance with a filter to create realistic effects, or nest instances and use the BitmapData class to animate filters to achieve this effect.

Flash CS3