A linear time algorithm for constructing orthogonal floor plans with minimum number of bends
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Let G = (V, E) be a planar triangulated graph (PTG) having every face triangular. A rectilinear dual or an orthogonal floor plan (OFP) of G is obtained by partitioning a rectangle into |V |rectilinear regions (modules) where two modules are adjacent if and only if there is an edge between the corresponding vertices in G. In this paper, a linear-time algorithm is presented for constructing an OFP for a given G such that the obtained OFP has B_min bends, where a bend in a concave corner in an OFP. Further, it has been proved that at least B_min bends are required to construct an OFP for G, where ρ- 2 ≤B_min ≤ρ+ 1 and ρis the sum of the number of leaves of the containment tree of G and the number of K_4 (4-vertex complete graph) in G.
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