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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Snapping things to guides.
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Frank Felfe <innerspace@iname.com>
* Carl Hetherington <inkscape@carlh.net>
*
* Copyright (C) 1999-2002 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "desktop.h"
#include "object/sp-guide.h"
#include "object/sp-namedview.h"
Inkscape::GuideSnapper::GuideSnapper(SnapManager *sm, Geom::Coord const d) : LineSnapper(sm, d)
{
}
/**
* \return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels
*/
Geom::Coord Inkscape::GuideSnapper::getSnapperTolerance() const
{
SPDesktop const *dt = _snapmanager->getDesktop();
double const zoom = dt ? dt->current_zoom() : 1;
return _snapmanager->snapprefs.getGuideTolerance() / zoom;
}
bool Inkscape::GuideSnapper::getSnapperAlwaysSnap() const
{
return _snapmanager->snapprefs.getGuideTolerance() == 10000; //TODO: Replace this threshold of 10000 by a constant; see also tolerance-slider.cpp
}
Inkscape::GuideSnapper::LineList Inkscape::GuideSnapper::_getSnapLines(Geom::Point const &/*p*/) const
{
LineList s;
if ( nullptr == _snapmanager->getNamedView() || ThisSnapperMightSnap() == false) {
return s;
}
SPGuide const *guide_to_ignore = _snapmanager->getGuideToIgnore();
std::vector<SPGuide *> guides = _snapmanager->getNamedView()->guides;
for(auto guide : guides) {
if (guide != guide_to_ignore) {
s.push_back(std::pair<Geom::Point, Geom::Point>(guide->getNormal(), guide->getPoint()));
}
}
return s;
}
/**
* \return true if this Snapper will snap at least one kind of point.
*/
bool Inkscape::GuideSnapper::ThisSnapperMightSnap() const
{
if (_snapmanager->getNamedView() == nullptr) {
return false;
}
return (_snap_enabled && _snapmanager->snapprefs.isTargetSnappable(Inkscape::SNAPTARGET_GUIDE) && _snapmanager->getNamedView()->showguides);
}
void Inkscape::GuideSnapper::_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
{
SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, source, source_num, Inkscape::SNAPTARGET_GUIDE, getSnapperTolerance(), getSnapperAlwaysSnap(), normal_to_line, point_on_line);
isr.guide_lines.push_back(dummy);
}
void Inkscape::GuideSnapper::_addSnappedLinesOrigin(IntermSnapResults &isr, Geom::Point const &origin, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const
{
SnappedPoint dummy = SnappedPoint(origin, source, source_num, Inkscape::SNAPTARGET_GUIDE_ORIGIN, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), constrained_snap, true);
isr.points.push_back(dummy);
}
void Inkscape::GuideSnapper::_addSnappedLinePerpendicularly(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const
{
SnappedPoint dummy = SnappedPoint(snapped_point, source, source_num, Inkscape::SNAPTARGET_GUIDE_PERPENDICULAR, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), constrained_snap, true);
isr.points.push_back(dummy);
}
void Inkscape::GuideSnapper::_addSnappedPoint(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const
{
SnappedPoint dummy = SnappedPoint(snapped_point, source, source_num, Inkscape::SNAPTARGET_GUIDE, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), constrained_snap, true);
isr.points.push_back(dummy);
}
/*
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 :
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