wayfind.hh

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#ifndef VSI_WAYFIND_HH
#define VSI_WAYFIND_HH
 
//== INCLUDES =================================================================
#include <QRegion>
#include <QPolygonF>
#include <QPoint>
#include <QHash>
#include <list>
 
//== NAMESPACES ===============================================================
namespace VSI {
 
//== FORWARDDECLARATIONS ======================================================
class GraphicsScene;
class Connection;
 
//== CLASS DEFINITION =========================================================
 
class WayFind {
 
  public:
    explicit WayFind (GraphicsScene *_scene);
 
    ~WayFind ();
 
    QPolygonF findWay (Connection *_conn, QPoint _from, QPoint _to);
 
  private:
 
    // Area node class
    class Node {
      public:
 
        // node direction
        enum Type {
          Vertical,
          Horizontal
        };
 
        explicit Node (unsigned int _counter);
        ~Node ();
 
      public:
        // last used counter
        unsigned int counter_;
 
        // current direction
        Type type_;
 
        // neighbor nodes
        Node *n_[4];
 
        // linked list handling
        Node *prev_;
        Node *next_;
 
        // node position
        QPoint pos_;
 
        // initialized from
        Node *from_;
 
        // A-Star consts
        unsigned int g_;
        unsigned int f_;
        unsigned int h_;
 
        // node cost
        unsigned int cost_;
 
        // already traversed
        bool closed_;
    };
 
    // Next position in distance _step from _pnt in direction _dir
    QPoint validPos (unsigned int _dir, int _step, QPoint _pnt);
 
    // Heuristic distance from _from to _to
    int heuristicDistance (const QPoint &_from, const QPoint &_to) const;
 
    // cleanup ununsed nodes
    void cleanup ();
 
  private:
 
    GraphicsScene *scene_;
 
    unsigned int counter_;
 
    std::list<Node *> nodes_;
    QHash<QPair<int, int>, Node*> map_;
 
    Node *ll_;
    QPoint oldFrom_;
    QRegion oldReg_;
};
 
}
 
#endif