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 {
21 class SnapCandidatePoint;
23 class LineSnapper : public Snapper
24 {
25 public:
26 LineSnapper(SnapManager *sm, Geom::Coord const d);
28 void freeSnap(SnappedConstraints &sc,
29 Inkscape::SnapCandidatePoint const &p,
30 Geom::OptRect const &bbox_to_snap,
31 std::vector<SPItem const *> const *it,
32 std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes) const;
34 void constrainedSnap(SnappedConstraints &sc,
35 Inkscape::SnapCandidatePoint const &p,
36 Geom::OptRect const &bbox_to_snap,
37 SnapConstraint const &c,
38 std::vector<SPItem const *> const *it) const;
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
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;
52 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;
54 // Will only be implemented for guide lines, because grid lines don't have an origin
55 virtual void _addSnappedLinesOrigin(SnappedConstraints &sc, Geom::Point const origin, Geom::Coord const snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const;
57 virtual void _addSnappedPoint(SnappedConstraints &sc, Geom::Point const snapped_point, Geom::Coord const snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const = 0;
58 };
60 }
62 #endif /* !SEEN_LINE_SNAPPER_H */