1 files changed, 64 insertions, 0 deletions
diff --git a/src/line-snapper.h b/src/line-snapper.h
new file mode 100644
index 0000000..4e1d919
--- /dev/null
+++ b/src/line-snapper.h
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_LINE_SNAPPER_H
+#define SEEN_LINE_SNAPPER_H
+/*
+ *    Authors:
+ *      Carl Hetherington <inkscape@carlh.net>
+ *      Diederik van Lierop <mail@diedenrezi.nl>
+ *
+ * 	  Copyright (C) 1999-2008 Authors
+ *
+ *    Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "snapper.h"
+
+namespace Inkscape {
+
+class SnapCandidatePoint;
+
+/**
+ * Superclass for snappers to horizontal and vertical lines.
+ */
+class LineSnapper : public Snapper
+{
+public:
+  LineSnapper(SnapManager *sm, Geom::Coord const d);
+
+  void freeSnap(IntermSnapResults &isr,
+                   Inkscape::SnapCandidatePoint const &p,
+                   Geom::OptRect const &bbox_to_snap,
+                   std::vector<SPObject const *> const *it,
+                   std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes) const override;
+
+  void constrainedSnap(IntermSnapResults &isr,
+                          Inkscape::SnapCandidatePoint const &p,
+                          Geom::OptRect const &bbox_to_snap,
+                          SnapConstraint const &c,
+                          std::vector<SPObject const *> const *it,
+                          std::vector<SnapCandidatePoint> *unselected_nodes) const override;
+
+protected:
+  typedef std::list<std::pair<Geom::Point, Geom::Point> > LineList;
+  //first point is a vector normal to the line
+  //second point is a point on the line
+
+private:
+  /**
+   *  \param p Point that we are trying to snap.
+   *  \return List of lines that we should try snapping to.
+   */
+  virtual LineList _getSnapLines(Geom::Point const &p) const = 0;
+
+  virtual void _addSnappedLine(IntermSnapResults &isr, 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;
+
+  // Will only be implemented for guide lines, because grid lines don't have an origin
+  virtual void _addSnappedLinesOrigin(IntermSnapResults &isr, Geom::Point const &origin, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const;
+
+  virtual void _addSnappedLinePerpendicularly(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const = 0;
+  virtual void _addSnappedPoint(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const = 0;
+};
+
+}
+
+#endif /* !SEEN_LINE_SNAPPER_H */