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You should describe the format of your polygon data, to avoid us guessing.

In general many efficient so called "clipping" algorithms depend on calculating "bounding boxes".

This - the smallest surrounding rectangular - allows eliminating many impossible candidates.

The rules are:

Thus storing the bounding-boxes in an ordered structure° helps efficiently eliminating impossible combinations.

But I suppose you are better off using an already available graphic lib.

HTH! :)

Cheers Rolf
_{(addicted to the Perl Programming Language :)

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