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 void freeSnap(SnappedConstraints &sc,
25 Inkscape::Snapper::PointType const &t,
26 NR::Point const &p,
27 bool const &first_point,
28 NR::Maybe<NR::Rect> const &bbox_to_snap,
29 std::vector<SPItem const *> const *it,
30 std::vector<NR::Point> *unselected_nodes) const;
32 void constrainedSnap(SnappedConstraints &sc,
33 Inkscape::Snapper::PointType const &t,
34 NR::Point const &p,
35 bool const &first_point,
36 NR::Maybe<NR::Rect> const &bbox_to_snap,
37 ConstraintLine const &c,
38 std::vector<SPItem const *> const *it) const;
40 protected:
41 typedef std::list<std::pair<NR::Point, NR::Point> > LineList;
42 //first point is a vector normal to the line
43 //second point is a point on the line
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(NR::Point const &p) const = 0;
52 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;
53 };
55 }
57 #endif /* !SEEN_LINE_SNAPPER_H */