RoutingChannel.h

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#pragma once
 
#include <ogdf/orthogonal/OrthoRep.h>
 
namespace ogdf {
 
template<class ATYPE>
class RoutingChannel {
public:
    // constructor
    RoutingChannel(const Graph& G, ATYPE sep, double cOver)
        : m_channel(G), m_separation(sep), m_cOverhang(cOver) { }
 
    // size of routing channel of side dir of node v
    const ATYPE& operator()(node v, OrthoDir dir) const {
        return m_channel[v].rc[static_cast<int>(dir)];
    }
 
    ATYPE& operator()(node v, OrthoDir dir) { return m_channel[v].rc[static_cast<int>(dir)]; }
 
    // returns separation (minimum distance between vertices/edges)
    ATYPE separation() const { return m_separation; }
 
    // returns cOverhang (such that overhang = separation * cOverhang)
    double cOverhang() const { return m_cOverhang; }
 
    // returns overhang (distance between vertex corners and edges)
    ATYPE overhang() const { return ATYPE(m_cOverhang * m_separation); }
 
    void computeRoutingChannels(const OrthoRep& OR, bool align = false) {
        const Graph& G = OR;
 
        for (node v : G.nodes) {
            const OrthoRep::VertexInfoUML* pInfo = OR.cageInfo(v);
 
            if (pInfo) {
                const OrthoRep::SideInfoUML& sNorth =
                        pInfo->m_side[static_cast<int>(OrthoDir::North)];
                const OrthoRep::SideInfoUML& sSouth =
                        pInfo->m_side[static_cast<int>(OrthoDir::South)];
                const OrthoRep::SideInfoUML& sWest = pInfo->m_side[static_cast<int>(OrthoDir::West)];
                const OrthoRep::SideInfoUML& sEast = pInfo->m_side[static_cast<int>(OrthoDir::East)];
 
                (*this)(v, OrthoDir::North) = computeRoutingChannel(sNorth, sSouth, align);
                (*this)(v, OrthoDir::South) = computeRoutingChannel(sSouth, sNorth, align);
                (*this)(v, OrthoDir::West) = computeRoutingChannel(sWest, sEast, align);
                (*this)(v, OrthoDir::East) = computeRoutingChannel(sEast, sWest, align);
            }
        }
    }
 
private:
    // computes required size of routing channel at side si with opposite side siOpp
    int computeRoutingChannel(const OrthoRep::SideInfoUML& si, const OrthoRep::SideInfoUML& siOpp,
            bool align = false) {
        if (si.m_adjGen == nullptr) {
            int k = si.m_nAttached[0];
            if (k == 0 || ((k == 1 && siOpp.totalAttached() == 0) && !align)) {
                return 0;
            } else {
                return (k + 1) * m_separation;
            }
 
        } else {
            int m = max(si.m_nAttached[0], si.m_nAttached[1]);
            if (m == 0) {
                return 0;
            } else {
                return (m + 1) * m_separation;
            }
        }
    }
 
    struct vInfo {
        ATYPE rc[4];
 
        vInfo() { rc[0] = rc[1] = rc[2] = rc[3] = ATYPE(); }
    };
 
    NodeArray<vInfo> m_channel;
    ATYPE m_separation;
    double m_cOverhang;
};
 
}