Abstract
AbstractWe present sweeping line graphs, a generalization of \(\varTheta \)-graphs. We show that these graphs are spanners of the complete graph, as well as of the visibility graph when line segment constraints or polygonal obstacles are considered. Our proofs use general inductive arguments to make the step to the constrained setting that could apply to other spanner constructions in the unconstrained setting, removing the need to find separate proofs that they are spanning in the constrained and polygonal obstacle settings.KeywordsSpannersSweeping lineObstacles\(\varTheta \)-graphs
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