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 :