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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * Authors:
+ * Parth Pant <parthpant4@gmail.com>
+ *
+ * Copyright (C) 2021 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_ALIGNMENT_SNAPPER_H
+#define SEEN_ALIGNMENT_SNAPPER_H
+
+#include <2geom/affine.h>
+#include <memory>
+
+#include "snap-enums.h"
+#include "snapper.h"
+#include "snap-candidate.h"
+
+class SPDesktop;
+class SPNamedView;
+class SPObject;
+class SPPath;
+class SPDesktop;
+
+namespace Inkscape
+{
+
+/**
+ * Snapping things to on-canvas alignment guides
+ */
+class AlignmentSnapper : public Snapper
+{
+
+public:
+ AlignmentSnapper(SnapManager *sm, Geom::Coord const d);
+ ~AlignmentSnapper() override;
+
+ /**
+ * @return true if this Snapper will snap at least one kind of point.
+ */
+ bool ThisSnapperMightSnap() const override;
+
+ /**
+ * @return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels.
+ */
+ Geom::Coord getSnapperTolerance() const override; //returns the tolerance of the snapper in screen pixels (i.e. independent of zoom)
+
+ bool getSnapperAlwaysSnap() const override; //if true, then the snapper will always snap, regardless of its tolerance
+
+ void freeSnap(IntermSnapResults &isr,
+ Inkscape::SnapCandidatePoint const &p,
+ Geom::OptRect const &bbox_to_snap,
+ std::vector<SPObject const *> const *it,
+ std::vector<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;
+
+private:
+ std::unique_ptr<std::vector<SnapCandidatePoint>> _points_to_snap_to;
+
+ /** Collects and caches points on bounding boxes of the candidates
+ * @param is the point first point in the selection?
+ */
+ void _collectBBoxPoints(bool const &first_point) const;
+
+ void _snapBBoxPoints(IntermSnapResults &isr,
+ SnapCandidatePoint const &p,
+ std::vector<SnapCandidatePoint> *unselected_nodes,
+ SnapConstraint const &c = SnapConstraint(),
+ Geom::Point const &p_proj_on_constraint = Geom::Point()) const;
+
+ SnapSourceType source2alignment(SnapSourceType s) const;
+
+ bool _allowSourceToSnapToTarget(SnapSourceType source, SnapTargetType target, bool strict_snapping) const;
+
+}; // end of AlignmentSnapper class
+
+} // end of namespace Inkscape
+
+#endif
+
+/*
+ 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:fileencoding=utf-8:textwidth=99 :