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  *      Diederik van Lierop <mail@diedenrezi.nl>
  11  *
  12  *        Copyright (C) 1999-2008 Authors
  13  *
  14  *    Released under GNU GPL, read the file 'COPYING' for more information.
  15  */
  16
  17 #include "snapper.h"
  18
  19 namespace Inkscape
  20 {
  21
  22 class LineSnapper : public Snapper
  23 {
  24 public:
  25   LineSnapper(SnapManager *sm, Geom::Coord const d);
  26
  27   void freeSnap(SnappedConstraints &sc,
  28                    Inkscape::SnapPreferences::PointType const &t,
  29                    Geom::Point const &p,
  30                    SnapSourceType const &source_type,
  31                    long source_num,
  32                    Geom::OptRect const &bbox_to_snap,
  33                    std::vector<SPItem const *> const *it,
  34                    std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const;
  35
  36   void constrainedSnap(SnappedConstraints &sc,
  37                           Inkscape::SnapPreferences::PointType const &t,
  38                           Geom::Point const &p,
  39                           SnapSourceType const &source_type,
  40                           long source_num,
  41                           Geom::OptRect const &bbox_to_snap,
  42                           ConstraintLine const &c,
  43                           std::vector<SPItem const *> const *it) const;
  44
  45 protected:
  46   typedef std::list<std::pair<Geom::Point, Geom::Point> > LineList;
  47   //first point is a vector normal to the line
  48   //second point is a point on the line
  49
  50 private:
  51   /**
  52    *  \param p Point that we are trying to snap.
  53    *  \return List of lines that we should try snapping to.
  54    */
  55   virtual LineList _getSnapLines(Geom::Point const &p) const = 0;
  56
  57   virtual void _addSnappedLine(SnappedConstraints &sc, Geom::Point const snapped_point, Geom::Coord const snapped_distance, SnapSourceType const &source, long source_num, Geom::Point const normal_to_line, Geom::Point const point_on_line) const = 0;
  58
  59   // Will only be implemented for guide lines, because grid lines don't have an origin
  60   virtual void _addSnappedLinesOrigin(SnappedConstraints &sc, Geom::Point const origin, Geom::Coord const snapped_distance, SnapSourceType const &source, long source_num) const;
  61
  62   virtual void _addSnappedPoint(SnappedConstraints &sc, Geom::Point const snapped_point, Geom::Coord const snapped_distance, SnapSourceType const &source, long source_num) const = 0;
  63 };
  64
  65 }
  66
  67 #endif /* !SEEN_LINE_SNAPPER_H */