README for Dual
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Dual is a simple application to demonstrate the concept of duality as
used in computational geometry (and arrangements).  Dual shows the
primal and dual planes for the mapping (a,b) <=> y=ax-b; it allows you
enter (and delete) points and lines in either plane to construct an arbitrarily
complex arrangement.  Points and lines may be colored and labeled, and
changed dynamically.

Ross Cutler
rgc@cs.umd.edu