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  • Committer: Diederik van Lierop
  • Date: 2009-12-24 20:10:43 UTC
  • Revision ID: diederik_van_lierop_mail_at-sign_diedenrezi_dot_nl-20091224201043-txzqbq2uvs8334ei
refactoring the snapping code (laying the groundwork for my next commit which reduces snap jitter)

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src/object-snapper.h
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{
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public:
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        ObjectSnapper(SnapManager *sm, Geom::Coord const d);
 
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    ObjectSnapper(SnapManager *sm, Geom::Coord const d);
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    ~ObjectSnapper();
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        enum DimensionToSnap {
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                GUIDE_TRANSL_SNAP_X, // For snapping a vertical guide (normal in the X-direction) to objects,
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                GUIDE_TRANSL_SNAP_Y, // For snapping a horizontal guide (normal in the Y-direction) to objects
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                ANGLED_GUIDE_TRANSL_SNAP, // For snapping an angled guide, while translating it accross the desktop
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                TRANSL_SNAP_XY}; // All other cases; for snapping to objects, other than guides
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        void guideFreeSnap(SnappedConstraints &sc,
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                                   Geom::Point const &p,
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                                   Geom::Point const &guide_normal) const;
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        void guideConstrainedSnap(SnappedConstraints &sc,
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                                           Geom::Point const &p,
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                                           Geom::Point const &guide_normal,
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                                           ConstraintLine const &c) const;
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        bool ThisSnapperMightSnap() const;
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        bool GuidesMightSnap() const;
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        Geom::Coord getSnapperTolerance() const; //returns the tolerance of the snapper in screen pixels (i.e. independent of zoom)
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        bool getSnapperAlwaysSnap() const; //if true, then the snapper will always snap, regardless of its tolerance
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        void freeSnap(SnappedConstraints &sc,
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                                  Inkscape::SnapPreferences::PointType const &t,
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                                  Geom::Point const &p,
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                                  SnapSourceType const &source_type,
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                                  bool const &first_point,
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                                  Geom::OptRect const &bbox_to_snap,
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                                  std::vector<SPItem const *> const *it,
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                                  std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const;
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        void constrainedSnap(SnappedConstraints &sc,
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                                  Inkscape::SnapPreferences::PointType const &t,
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                                  Geom::Point const &p,
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                                  SnapSourceType const &source_type,
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                                  bool const &first_point,
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                                  Geom::OptRect const &bbox_to_snap,
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                                  ConstraintLine const &c,
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                                  std::vector<SPItem const *> const *it) const;
 
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    enum DimensionToSnap {
 
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        GUIDE_TRANSL_SNAP_X, // For snapping a vertical guide (normal in the X-direction) to objects,
 
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        GUIDE_TRANSL_SNAP_Y, // For snapping a horizontal guide (normal in the Y-direction) to objects
 
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        ANGLED_GUIDE_TRANSL_SNAP, // For snapping an angled guide, while translating it accross the desktop
 
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        TRANSL_SNAP_XY}; // All other cases; for snapping to objects, other than guides
 
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    void guideFreeSnap(SnappedConstraints &sc,
 
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                   Geom::Point const &p,
 
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                   Geom::Point const &guide_normal) const;
 
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    void guideConstrainedSnap(SnappedConstraints &sc,
 
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                       Geom::Point const &p,
 
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                       Geom::Point const &guide_normal,
 
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                       ConstraintLine const &c) const;
 
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    bool ThisSnapperMightSnap() const;
 
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    bool GuidesMightSnap() const;
 
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    Geom::Coord getSnapperTolerance() const; //returns the tolerance of the snapper in screen pixels (i.e. independent of zoom)
 
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    bool getSnapperAlwaysSnap() const; //if true, then the snapper will always snap, regardless of its tolerance
 
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    void freeSnap(SnappedConstraints &sc,
 
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                  Inkscape::SnapPreferences::PointType const &t,
 
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                  Geom::Point const &p,
 
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                  SnapSourceType const &source_type,
 
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                  long source_num,
 
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                  Geom::OptRect const &bbox_to_snap,
 
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                  std::vector<SPItem const *> const *it,
 
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                  std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const;
 
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    void constrainedSnap(SnappedConstraints &sc,
 
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                  Inkscape::SnapPreferences::PointType const &t,
 
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                  Geom::Point const &p,
 
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                  SnapSourceType const &source_type,
 
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                  long source_num,
 
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                  Geom::OptRect const &bbox_to_snap,
 
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                  ConstraintLine const &c,
 
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                  std::vector<SPItem const *> const *it) const;
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private:
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    //store some lists of candidates, points and paths, so we don't have to rebuild them for each point we want to snap
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                      Inkscape::SnapPreferences::PointType const &t,
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                      Geom::Point const &p, // in desktop coordinates
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                      SnapSourceType const &source_type,
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                      bool const &first_point,
 
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                      long source_num,
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                      std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const; // in desktop coordinates
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    void _snapTranslatingGuideToNodes(SnappedConstraints &sc,
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    void _snapPaths(SnappedConstraints &sc,
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                      Inkscape::SnapPreferences::PointType const &t,
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                      Geom::Point const &p,     // in desktop coordinates
 
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                      Geom::Point const &p,    // in desktop coordinates
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                      SnapSourceType const &source_type,
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                      bool const &first_point,
 
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                      long source_num,
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                      std::vector<std::pair<Geom::Point, int> > *unselected_nodes, // in desktop coordinates
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                      SPPath const *selected_path) const;
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                 Inkscape::SnapPreferences::PointType const &t,
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                 Geom::Point const &p, // in desktop coordinates
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                 SnapSourceType const source_type,
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                                 bool const &first_point,
 
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                 long source_num,
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                 ConstraintLine const &c) const;
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    bool isUnselectedNode(Geom::Point const &point, std::vector<std::pair<Geom::Point, int> > const *unselected_nodes) const;