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// 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<SPItem 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<SPItem 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 */
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