src/line-snapper.h

   1 #ifndef SEEN_LINE_SNAPPER_H
   2 #define SEEN_LINE_SNAPPER_H
   3
   4 /**
   5  *    \file src/line-snapper.h
   6  *    \brief Superclass for snappers to horizontal and vertical lines.
   7  *
   8  *    Authors:
   9  *      Carl Hetherington <inkscape@carlh.net>
  10  *
  11  *    Released under GNU GPL, read the file 'COPYING' for more information.
  12  */
  13
  14 #include "snapper.h"
  15
  16 namespace Inkscape
  17 {
  18
  19 class LineSnapper : public Snapper
  20 {
  21 public:
  22   LineSnapper(SnapManager const *sm, Geom::Coord const d);
  23
  24   void freeSnap(SnappedConstraints &sc,
  25                    Inkscape::Snapper::PointType const &t,
  26                    Geom::Point const &p,
  27                    bool const &first_point,
  28                    boost::optional<Geom::Rect> const &bbox_to_snap,
  29                    std::vector<SPItem const *> const *it,
  30                    std::vector<Geom::Point> *unselected_nodes) const;
  31
  32   void constrainedSnap(SnappedConstraints &sc,
  33                           Inkscape::Snapper::PointType const &t,
  34                           Geom::Point const &p,
  35                           bool const &first_point,
  36                           boost::optional<Geom::Rect> const &bbox_to_snap,
  37                           ConstraintLine const &c,
  38                           std::vector<SPItem const *> const *it) const;
  39
  40 protected:
  41   typedef std::list<std::pair<Geom::Point, Geom::Point> > LineList;
  42   //first point is a vector normal to the line
  43   //second point is a point on the line
  44
  45 private:
  46   /**
  47    *  \param p Point that we are trying to snap.
  48    *  \return List of lines that we should try snapping to.
  49    */
  50   virtual LineList _getSnapLines(Geom::Point const &p) const = 0;
  51
  52   virtual void _addSnappedLine(SnappedConstraints &sc, Geom::Point const snapped_point, Geom::Coord const snapped_distance, Geom::Point const normal_to_line, Geom::Point const point_on_line) const = 0;
  53 };
  54
  55 }
  56
  57 #endif /* !SEEN_LINE_SNAPPER_H */