Patchworks now has a tool to map 'Core Areas', which are defined as the area within the event horizon of a patch. The event horizon sphere of influence of a patch, and is calculated by 'buffering out' from a patch and then 'buffering in' by the same distance.
See the API documentation for the ca.spatial.gis.raster.CoreBoundary class for more information.
A raster algorithm is used in order to obtain reasonable interactive performance.
Minor changes and fixes:
Patchworks has been ported over to Java version 1.6. A number of subtle changes to the Patchworks code were required due to changes in in the Java platform.