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 * 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 */
17 #include "snapper.h"
19 namespace Inkscape
20 {
22 class LineSnapper : public Snapper
23 {
24 public:
25 LineSnapper(SnapManager *sm, Geom::Coord const d);
27 void freeSnap(SnappedConstraints &sc,
28 Inkscape::SnapPreferences::PointType const &t,
29 Geom::Point const &p,
30 bool const &first_point,
31 Geom::OptRect const &bbox_to_snap,
32 std::vector<SPItem const *> const *it,
33 std::vector<Geom::Point> *unselected_nodes) const;
35 void constrainedSnap(SnappedConstraints &sc,
36 Inkscape::SnapPreferences::PointType const &t,
37 Geom::Point const &p,
38 bool const &first_point,
39 Geom::OptRect const &bbox_to_snap,
40 ConstraintLine const &c,
41 std::vector<SPItem const *> const *it) const;
43 protected:
44 typedef std::list<std::pair<Geom::Point, Geom::Point> > LineList;
45 //first point is a vector normal to the line
46 //second point is a point on the line
48 private:
49 /**
50 * \param p Point that we are trying to snap.
51 * \return List of lines that we should try snapping to.
52 */
53 virtual LineList _getSnapLines(Geom::Point const &p) const = 0;
55 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;
56 };
58 }
60 #endif /* !SEEN_LINE_SNAPPER_H */