diff options
Diffstat (limited to '')
-rw-r--r-- | src/guide-snapper.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/guide-snapper.cpp b/src/guide-snapper.cpp new file mode 100644 index 0000000..7278cd0 --- /dev/null +++ b/src/guide-snapper.cpp @@ -0,0 +1,104 @@ +// 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 : |