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diff --git a/src/snapped-line.h b/src/snapped-line.h
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+++ b/src/snapped-line.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SNAPPEDLINE_H
+#define SEEN_SNAPPEDLINE_H
+
+/**
+ *    \file src/snapped-line.h
+ *    \brief SnappedLine class.
+ *
+ *    Authors:
+ *      Diederik van Lierop <mail@diedenrezi.nl>
+ *
+ *    Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <vector>
+#include <list>
+#include "snapped-point.h"
+
+namespace Inkscape
+{
+
+/// Class describing the result of an attempt to snap to a line segment.
+class SnappedLineSegment : public SnappedPoint
+{
+public:
+    SnappedLineSegment();
+    SnappedLineSegment(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, SnapTargetType const &target, Geom::Coord const &snapped_tolerance,bool const &always_snap, Geom::Point const &start_point_of_line, Geom::Point const &end_point_of_line);
+    ~SnappedLineSegment();
+    Inkscape::SnappedPoint intersect(SnappedLineSegment const &line) const; //intersect with another SnappedLineSegment
+    Geom::LineSegment getLineSegment() const {return Geom::LineSegment(_start_point_of_line, _end_point_of_line);}
+
+private:
+    Geom::Point _start_point_of_line;
+    Geom::Point _end_point_of_line;
+};
+
+
+/// Class describing the result of an attempt to snap to a line.
+class SnappedLine : public SnappedPoint
+{
+public:
+    SnappedLine();
+    SnappedLine(Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, SnapTargetType const &target, Geom::Coord const &snapped_tolerance, bool const &always_snap, Geom::Point const &normal_to_line, Geom::Point const &point_on_line);
+    ~SnappedLine();
+    Inkscape::SnappedPoint intersect(SnappedLine const &line) const; //intersect with another SnappedLine
+    // This line is described by this equation:
+    //        a*x + b*y = c  <->  nx*px + ny+py = c  <->  n.p = c
+    Geom::Point getNormal() const {return _normal_to_line;}                             // n = (nx, ny)
+    Geom::Point getPointOnLine() const {return _point_on_line;}                         // p = (px, py)
+    Geom::Coord getConstTerm() const {return dot(_normal_to_line, _point_on_line);}     // c = n.p = nx*px + ny*py;
+    Geom::Line getLine() const {return Geom::Line(_point_on_line, _point_on_line + Geom::rot90(_normal_to_line));}
+
+private:
+    Geom::Point _normal_to_line;
+    Geom::Point _point_on_line;
+};
+
+}
+
+bool getClosestSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedLineSegment &result);
+bool getClosestIntersectionSLS(std::list<Inkscape::SnappedLineSegment> const &list, Inkscape::SnappedPoint &result);
+bool getClosestSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedLine &result);
+bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list, Inkscape::SnappedPoint &result);
+bool getClosestIntersectionSL(std::list<Inkscape::SnappedLine> const &list1, std::list<Inkscape::SnappedLine> const &list2, Inkscape::SnappedPoint &result);
+
+
+#endif /* !SEEN_SNAPPEDLINE_H */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :