1 #ifndef SEEN_LINE_SNAPPER_H
2 #define SEEN_LINE_SNAPPER_H
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 */
14 #include "snapper.h"
16 namespace Inkscape
17 {
19 class LineSnapper : public Snapper
20 {
21 public:
22 LineSnapper(SPNamedView const *nv, NR::Coord const d);
24 protected:
25 typedef std::list<std::pair<NR::Point, NR::Point> > LineList;
26 //first point is a vector normal to the line
27 //second point is a point on the line
29 private:
30 void _doFreeSnap(SnappedConstraints &sc,
31 Inkscape::Snapper::PointType const &t,
32 NR::Point const &p,
33 bool const &first_point,
34 std::vector<NR::Point> &points_to_snap,
35 std::list<SPItem const *> const &it) const;
37 void _doConstrainedSnap(SnappedConstraints &sc,
38 Inkscape::Snapper::PointType const &t,
39 NR::Point const &p,
40 bool const &first_point,
41 std::vector<NR::Point> &points_to_snap,
42 ConstraintLine const &c,
43 std::list<SPItem const *> const &it) const;
45 /**
46 * \param p Point that we are trying to snap.
47 * \return List of lines that we should try snapping to.
48 */
49 virtual LineList _getSnapLines(NR::Point const &p) const = 0;
51 virtual void _addSnappedLine(SnappedConstraints &sc, NR::Point const snapped_point, NR::Coord const snapped_distance, NR::Point const normal_to_line, NR::Point const point_on_line) const = 0;
52 };
54 }
56 #endif /* !SEEN_LINE_SNAPPER_H */