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Overlap Rule

Syntax: Overlap [Region region_expr] expression [string]

This test fails if any source figure is not completely covered by the figures associated with the expression. In other words, for the situation where no Region is given, the expression must evaluate true at every point of every object on the present layer. This is illustrated in Figure 15.1, for no Region and an expression consisting of a single layer.

Figure 15.1: The Overlap test. The present figure (solid) must be completely covered by figures resulting from evaluating the expression argument (dotted).

Stephen R. Whiteley 2022-05-28