Code

snap indicator: try a diamond shaped indicator for snapping to nodes. see how we...
[inkscape.git] / src / line-snapper.h
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 */