IOPoints.h

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#pragma once
 
#include <ogdf/planarity/PlanRep.h>
 
namespace ogdf {
 
 
struct InOutPoint {
    int m_dx, m_dy;
    adjEntry m_adj;
 
    InOutPoint() {
        m_dx = m_dy = 0;
        m_adj = nullptr;
    }
 
    explicit InOutPoint(adjEntry adj) {
        m_adj = adj;
        m_dx = m_dy = 0;
    }
};
 
class IOPoints {
public:
    IOPoints() { }
 
    explicit IOPoints(const Graph& G)
        : m_depth(G, 0), m_height(G, 0), m_in(G), m_out(G), m_mark(G, false), m_pointOf(G, nullptr) { }
 
    ~IOPoints() { }
 
    // length of in- or outpoint list
    int out(node v) const { return m_out[v].size(); }
 
    int in(node v) const { return m_in[v].size(); }
 
    // getting a const-reference to in- or outpoint list
    const List<InOutPoint>& inpoints(node v) const { return m_in[v]; }
 
    List<InOutPoint>& inpoints(node v) { return m_in[v]; }
 
    const List<InOutPoint>& outpoints(node v) const { return m_out[v]; }
 
    List<InOutPoint>& outpoints(node v) { return m_out[v]; }
 
    // getting the in-/outpoint belonging to an adjacency entry
    const InOutPoint* pointOf(adjEntry adj) const { return m_pointOf[adj]; }
 
    // marking adjacency entries
    bool marked(adjEntry adj) const { return m_mark[adj]; }
 
    bool marked(node v) { return v->outdeg() == 1 && marked(v->firstAdj()); }
 
    // finding outpoints belonging to non-marked edges
    ListConstIterator<InOutPoint> firstRealOut(node v) const {
        return searchRealForward(m_out[v].begin());
    }
 
    ListConstIterator<InOutPoint> lastRealOut(node v) const {
        return searchRealBackward(m_out[v].rbegin());
    }
 
    ListConstIterator<InOutPoint> nextRealOut(ListConstIterator<InOutPoint> it) const {
        return searchRealForward(it.succ());
    }
 
    ListConstIterator<InOutPoint> prevRealOut(ListConstIterator<InOutPoint> it) const {
        return searchRealBackward(it.pred());
    }
 
    // building in-/outpoint lists
    void appendInpoint(adjEntry adj) {
        node v = adj->theNode();
        m_pointOf[adj] = &(*m_in[v].pushBack(InOutPoint(adj)));
    }
 
    void appendOutpoint(adjEntry adj) {
        node v = adj->theNode();
        m_pointOf[adj] = &(*m_out[v].pushBack(InOutPoint(adj)));
    }
 
    void pushInpoint(adjEntry adj) {
        node v = adj->theNode();
        m_pointOf[adj] = &(*m_in[v].pushFront(InOutPoint(adj)));
    }
 
    // setting relative coordinates
    void setOutCoord(ListIterator<InOutPoint> it, int dx, int dy) {
        (*it).m_dx = dx;
        (*it).m_dy = dy;
    }
 
    void setInCoord(ListIterator<InOutPoint> it, int dx, int dy) {
        (*it).m_dx = dx;
        (*it).m_dy = dy;
    }
 
    void setOutDx(ListIterator<InOutPoint> it, int dx) { (*it).m_dx = dx; }
 
    void restoreDeg1Nodes(PlanRep& PG, ArrayBuffer<PlanRep::Deg1RestoreInfo>& S);
 
    void changeEdge(node v, adjEntry adj_new) {
        m_out[v].popBack();
        appendInpoint(adj_new);
    }
 
    // belongs v to a chain (= at most to non-marked incoming edges
    bool isChain(node v) const {
        int i = 0;
        for (const InOutPoint& iop : m_in[v]) {
            if (!marked(iop.m_adj)) {
                ++i;
            }
        }
        return i <= 2;
    }
 
    // width of the left-/right side of an in-/outpoint list
    int outLeft(node v) const { return (m_out[v].empty()) ? 0 : (-m_out[v].front().m_dx); }
 
    int outRight(node v) const { return (m_out[v].empty()) ? 0 : (m_out[v].back().m_dx); }
 
    int inLeft(node v) const { return (m_in[v].empty()) ? 0 : (-m_in[v].front().m_dx); }
 
    int inRight(node v) const { return (m_in[v].empty()) ? 0 : (m_in[v].back().m_dx); }
 
    int maxLeft(node v) const { return max(inLeft(v), outLeft(v)); }
 
    int maxRight(node v) const { return max(inRight(v), outRight(v)); }
 
    int maxPlusLeft(node v) const {
        return (in(v) >= 3) ? max(inLeft(v) + 1, outLeft(v)) : maxLeft(v);
    }
 
    int maxPlusRight(node v) const {
        return (in(v) >= 3) ? max(inRight(v) + 1, outRight(v)) : maxRight(v);
    }
 
    InOutPoint middleNeighbor(node z1) const;
 
    void numDeg1(node v, int& xl, int& xr, bool doubleCount) const;
 
    adjEntry switchBeginIn(node v);
    adjEntry switchEndIn(node v);
 
    void switchBeginOut(node v);
    void switchEndOut(node v);
 
 
    NodeArray<int> m_depth, m_height;
 
 
private:
    NodeArray<List<InOutPoint>> m_in, m_out;
    AdjEntryArray<bool> m_mark;
    AdjEntryArray<InOutPoint*> m_pointOf;
 
    ListConstIterator<InOutPoint> searchRealForward(ListConstIterator<InOutPoint> it) const;
    ListConstIterator<InOutPoint> searchRealBackward(ListConstIterator<InOutPoint> it) const;
};
 
}