1 #ifndef SEEN_SNAPPEDLINE_H
2 #define SEEN_SNAPPEDLINE_H
4 /**
5 * \file src/snapped-line.h
6 * \brief SnappedLine class.
7 *
8 * Authors:
9 * Diederik van Lierop <mail@diedenrezi.nl>
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information.
12 */
14 #include <vector>
15 #include <list>
16 #include "libnr/nr-coord.h"
17 #include "libnr/nr-point.h"
18 #include <libnr/nr-point-fns.h>
19 #include "snapped-point.h"
21 namespace Inkscape
22 {
24 /// Class describing the result of an attempt to snap to a line segment.
25 class SnappedLineSegment : public SnappedPoint
26 {
27 public:
28 SnappedLineSegment();
29 SnappedLineSegment(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, Geom::Coord const &snapped_tolerance, bool const &always_snap, Geom::Point const &start_point_of_line, Geom::Point const &end_point_of_line);
30 ~SnappedLineSegment();
31 Inkscape::SnappedPoint intersect(SnappedLineSegment const &line) const; //intersect with another SnappedLineSegment
33 private:
34 Geom::Point _start_point_of_line;
35 Geom::Point _end_point_of_line;
36 };
39 /// Class describing the result of an attempt to snap to a line.
40 class SnappedLine : public SnappedPoint
41 {
42 public:
43 SnappedLine();
44 SnappedLine(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, Geom::Coord const &snapped_tolerance, bool const &always_snap, Geom::Point const &normal_to_line, Geom::Point const &point_on_line);
45 ~SnappedLine();
46 Inkscape::SnappedPoint intersect(SnappedLine const &line) const; //intersect with another SnappedLine
47 // This line is described by this equation:
48 // a*x + b*y = c <-> nx*px + ny+py = c <-> n.p = c
49 Geom::Point getNormal() const {return _normal_to_line;} // n = (nx, ny)
50 Geom::Point getPointOnLine() const {return _point_on_line;} // p = (px, py)
51 Geom::Coord getConstTerm() const {return dot(_normal_to_line, _point_on_line);} // c = n.p = nx*px + ny*py;
53 private:
54 Geom::Point _normal_to_line;
55 Geom::Point _point_on_line;
56 };
58 }
60 bool getClosestSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedLineSegment &result);
61 bool getClosestIntersectionSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedPoint &result);
62 bool getClosestSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedLine &result);
63 bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedPoint &result);
64 bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list1, std::list<Inkscape::SnappedLine> const &list2, Inkscape::SnappedPoint &result);
67 #endif /* !SEEN_SNAPPEDLINE_H */
69 /*
70 Local Variables:
71 mode:c++
72 c-file-style:"stroustrup"
73 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
74 indent-tabs-mode:nil
75 fill-column:99
76 End:
77 */
78 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :