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@@ -32,3 +32,16 @@ parallel to an edge passes through an odd number of edges.
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A point $x$ is *exterior* if a ray through it ... etc ... passes
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through an even number of edges.
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These two facts form the basis of an algorithm for determining whether
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a point is inside a polygon.
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*diagonal*
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: A line segment of $P$ connecting two vertices and lying in the interior of
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$P$, not touching $\partial P$ except at endpoints. Two diagonals are
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*noncrossing* if they share no interior points.
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*triangulation*
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: A decomposition of $P$ into triangles by a maximal set of
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noncrossing diagonals. Maximal means that no more diagonals may be
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added without crossing.
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