Algorithm to merge adjacent rectangles into polygon?

I had to write an algorithm for merging adjacent polygons as part of an experiment project with HTML5 canvas (nothing glorious, a jigsaw puzzle :-) Holes in the resulting polygon are naturally supported. The Javascript routine is found in the function named Polygon.prototype.merge() in www dot raymondhill dot net / puzzle-rhill / jigsawpuzzle-rhill-3 dot js.

I would look into something like General Polygon Clipper. You're basically doing union (OR) polygon operations. The fact that they're all rectangles just makes the math a bit easier, but it could easily be done with something like GPC.

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