2
* \file object-snapper.cpp
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* \brief Snapping things to objects.
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* Carl Hetherington <inkscape@carlh.net>
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* Diederik van Lierop <mail@diedenrezi.nl>
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* Copyright (C) 2005 - 2008 Authors
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* Released under GNU GPL, read the file 'COPYING' for more information
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#include <2geom/path-intersection.h>
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#include <2geom/point.h>
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#include <2geom/rect.h>
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#include <2geom/line.h>
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#include "sp-namedview.h"
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#include "sp-item-group.h"
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#include "display/curve.h"
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#include "preferences.h"
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#include "sp-flowtext.h"
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#include "text-editing.h"
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#include "sp-clippath.h"
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#include "helper/geom-curves.h"
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Inkscape::SnapCandidate::SnapCandidate(SPItem* item, bool clip_or_mask, Geom::Matrix additional_affine)
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: item(item), clip_or_mask(clip_or_mask), additional_affine(additional_affine)
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Inkscape::SnapCandidate::~SnapCandidate()
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Inkscape::ObjectSnapper::ObjectSnapper(SnapManager *sm, Geom::Coord const d)
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_candidates = new std::vector<SnapCandidate>;
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_points_to_snap_to = new std::vector<std::pair<Geom::Point, int> >;
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_paths_to_snap_to = new std::vector<std::pair<Geom::PathVector*, SnapTargetType> >;
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Inkscape::ObjectSnapper::~ObjectSnapper()
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_points_to_snap_to->clear();
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delete _points_to_snap_to;
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delete _paths_to_snap_to;
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* \return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels
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Geom::Coord Inkscape::ObjectSnapper::getSnapperTolerance() const
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SPDesktop const *dt = _snapmanager->getDesktop();
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double const zoom = dt ? dt->current_zoom() : 1;
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return _snapmanager->snapprefs.getObjectTolerance() / zoom;
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bool Inkscape::ObjectSnapper::getSnapperAlwaysSnap() const
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return _snapmanager->snapprefs.getObjectTolerance() == 10000; //TODO: Replace this threshold of 10000 by a constant; see also tolerance-slider.cpp
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* Find all items within snapping range.
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* \param parent Pointer to the document's root, or to a clipped path or mask object
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* \param it List of items to ignore
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* \param first_point If true then this point is the first one from a whole bunch of points
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* \param bbox_to_snap Bounding box hulling the whole bunch of points, all from the same selection and having the same transformation
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* \param DimensionToSnap Snap in X, Y, or both directions.
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void Inkscape::ObjectSnapper::_findCandidates(SPObject* parent,
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std::vector<SPItem const *> const *it,
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bool const &first_point,
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Geom::Rect const &bbox_to_snap,
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DimensionToSnap const snap_dim,
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bool const clip_or_mask,
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Geom::Matrix const additional_affine) const // transformation of the item being clipped / masked
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bool const c1 = (snap_dim == TRANSL_SNAP_XY) && ThisSnapperMightSnap();
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bool const c2 = (snap_dim != TRANSL_SNAP_XY) && GuidesMightSnap();
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_candidates->clear();
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Geom::Rect bbox_to_snap_incl = bbox_to_snap; // _incl means: will include the snapper tolerance
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bbox_to_snap_incl.expandBy(getSnapperTolerance()); // see?
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for (SPObject* o = sp_object_first_child(parent); o != NULL; o = SP_OBJECT_NEXT(o)) {
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g_assert(_snapmanager->getDesktop() != NULL);
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if (SP_IS_ITEM(o) && !(_snapmanager->getDesktop()->itemIsHidden(SP_ITEM(o)) && !clip_or_mask)) {
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// Snapping to items in a locked layer is allowed
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// Don't snap to hidden objects, unless they're a clipped path or a mask
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/* See if this item is on the ignore list */
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std::vector<SPItem const *>::const_iterator i;
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while (i != it->end() && *i != o) {
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if (it == NULL || i == it->end()) {
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SPItem *item = SP_ITEM(o);
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SPObject *obj = NULL;
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if (!clip_or_mask) { // cannot clip or mask more than once
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// The current item is not a clipping path or a mask, but might
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// still be the subject of clipping or masking itself ; if so, then
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// we should also consider that path or mask for snapping to
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obj = SP_OBJECT(item->clip_ref->getObject());
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_findCandidates(obj, it, false, bbox_to_snap, snap_dim, true, sp_item_i2doc_affine(item));
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obj = SP_OBJECT(item->mask_ref->getObject());
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_findCandidates(obj, it, false, bbox_to_snap, snap_dim, true, sp_item_i2doc_affine(item));
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if (SP_IS_GROUP(o)) {
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_findCandidates(o, it, false, bbox_to_snap, snap_dim, clip_or_mask, additional_affine);
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Geom::OptRect bbox_of_item = Geom::Rect();
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// Oh oh, this will get ugly. We cannot use sp_item_i2d_affine directly because we need to
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// insert an additional transformation in document coordinates (code copied from sp_item_i2d_affine)
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sp_item_invoke_bbox(item,
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sp_item_i2doc_affine(item) * additional_affine * _snapmanager->getDesktop()->doc2dt(),
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sp_item_invoke_bbox(item, bbox_of_item, sp_item_i2d_affine(item), true);
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// See if the item is within range
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if (bbox_to_snap_incl.intersects(*bbox_of_item)) {
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// This item is within snapping range, so record it as a candidate
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_candidates->push_back(SnapCandidate(item, clip_or_mask, additional_affine));
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// For debugging: print the id of the candidate to the console
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// SPObject *obj = (SPObject*)item;
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// std::cout << "Snap candidate added: " << obj->id << std::endl;
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void Inkscape::ObjectSnapper::_collectNodes(Inkscape::SnapPreferences::PointType const &t,
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bool const &first_point) const
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// Now, let's first collect all points to snap to. If we have a whole bunch of points to snap,
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// e.g. when translating an item using the selector tool, then we will only do this for the
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// first point and store the collection for later use. This significantly improves the performance
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_points_to_snap_to->clear();
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// Determine the type of bounding box we should snap to
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SPItem::BBoxType bbox_type = SPItem::GEOMETRIC_BBOX;
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bool p_is_a_node = t & Inkscape::SnapPreferences::SNAPPOINT_NODE;
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bool p_is_a_bbox = t & Inkscape::SnapPreferences::SNAPPOINT_BBOX;
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bool p_is_a_guide = t & Inkscape::SnapPreferences::SNAPPOINT_GUIDE;
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// A point considered for snapping should be either a node, a bbox corner or a guide. Pick only ONE!
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g_assert(!((p_is_a_node && p_is_a_bbox) || (p_is_a_bbox && p_is_a_guide) || (p_is_a_node && p_is_a_guide)));
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if (_snapmanager->snapprefs.getSnapToBBoxNode() || _snapmanager->snapprefs.getSnapBBoxEdgeMidpoints() || _snapmanager->snapprefs.getSnapBBoxMidpoints()) {
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Inkscape::Preferences *prefs = Inkscape::Preferences::get();
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bool prefs_bbox = prefs->getBool("/tools/bounding_box");
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bbox_type = !prefs_bbox ?
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SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
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// Consider the page border for snapping to
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if (_snapmanager->snapprefs.getSnapToPageBorder()) {
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_getBorderNodes(_points_to_snap_to);
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for (std::vector<SnapCandidate>::const_iterator i = _candidates->begin(); i != _candidates->end(); i++) {
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//Geom::Matrix i2doc(Geom::identity());
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SPItem *root_item = (*i).item;
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if (SP_IS_USE((*i).item)) {
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root_item = sp_use_root(SP_USE((*i).item));
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g_return_if_fail(root_item);
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//Collect all nodes so we can snap to them
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if (p_is_a_node || !(_snapmanager->snapprefs.getStrictSnapping() && !p_is_a_node) || p_is_a_guide) {
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// Note: there are two ways in which intersections are considered:
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// Method 1: Intersections are calculated for each shape individually, for both the
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// snap source and snap target (see sp_shape_snappoints)
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// Method 2: Intersections are calculated for each curve or line that we've snapped to, i.e. only for
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// the target (see the intersect() method in the SnappedCurve and SnappedLine classes)
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// - Method 1 doesn't find intersections within a set of multiple objects
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// - Method 2 only works for targets
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// When considering intersections as snap targets:
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// - Method 1 only works when snapping to nodes, whereas
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// - Method 2 only works when snapping to paths
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// - There will be performance differences too!
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// If both methods are being used simultaneously, then this might lead to duplicate targets!
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// Well, here we will be looking for snap TARGETS. Both methods can therefore be used.
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// When snapping to paths, we will get a collection of snapped lines and snapped curves. findBestSnap() will
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// go hunting for intersections (but only when asked to in the prefs of course). In that case we can just
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// temporarily block the intersections in sp_item_snappoints, we don't need duplicates. If we're not snapping to
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// paths though but only to item nodes then we should still look for the intersections in sp_item_snappoints()
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bool old_pref = _snapmanager->snapprefs.getSnapIntersectionCS();
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if (_snapmanager->snapprefs.getSnapToItemPath()) {
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_snapmanager->snapprefs.setSnapIntersectionCS(false);
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sp_item_snappoints(root_item, true, *_points_to_snap_to, &_snapmanager->snapprefs);
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if (_snapmanager->snapprefs.getSnapToItemPath()) {
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_snapmanager->snapprefs.setSnapIntersectionCS(old_pref);
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//Collect the bounding box's corners so we can snap to them
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if (p_is_a_bbox || !(_snapmanager->snapprefs.getStrictSnapping() && !p_is_a_bbox) || p_is_a_guide) {
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// Discard the bbox of a clipped path / mask, because we don't want to snap to both the bbox
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// of the item AND the bbox of the clipping path at the same time
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if (!(*i).clip_or_mask) {
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Geom::OptRect b = sp_item_bbox_desktop(root_item, bbox_type);
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getBBoxPoints(b, _points_to_snap_to, true, _snapmanager->snapprefs.getSnapToBBoxNode(), _snapmanager->snapprefs.getSnapBBoxEdgeMidpoints(), _snapmanager->snapprefs.getSnapBBoxMidpoints());
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void Inkscape::ObjectSnapper::_snapNodes(SnappedConstraints &sc,
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Inkscape::SnapPreferences::PointType const &t,
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Geom::Point const &p,
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SnapSourceType const &source_type,
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bool const &first_point,
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std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const
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// Iterate through all nodes, find out which one is the closest to p, and snap to it!
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_collectNodes(t, first_point);
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if (unselected_nodes != NULL) {
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_points_to_snap_to->insert(_points_to_snap_to->end(), unselected_nodes->begin(), unselected_nodes->end());
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bool success = false;
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for (std::vector<std::pair<Geom::Point, int> >::const_iterator k = _points_to_snap_to->begin(); k != _points_to_snap_to->end(); k++) {
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Geom::Coord dist = Geom::L2((*k).first - p);
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if (dist < getSnapperTolerance() && dist < s.getSnapDistance()) {
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s = SnappedPoint((*k).first, source_type, static_cast<Inkscape::SnapTargetType>((*k).second), dist, getSnapperTolerance(), getSnapperAlwaysSnap(), true);
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sc.points.push_back(s);
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void Inkscape::ObjectSnapper::_snapTranslatingGuideToNodes(SnappedConstraints &sc,
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Inkscape::SnapPreferences::PointType const &t,
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Geom::Point const &p,
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Geom::Point const &guide_normal) const
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// Iterate through all nodes, find out which one is the closest to this guide, and snap to it!
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_collectNodes(t, true);
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Geom::Coord tol = getSnapperTolerance();
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for (std::vector<std::pair<Geom::Point, int> >::const_iterator k = _points_to_snap_to->begin(); k != _points_to_snap_to->end(); k++) {
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// Project each node (*k) on the guide line (running through point p)
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Geom::Point p_proj = Geom::projection((*k).first, Geom::Line(p, p + Geom::rot90(guide_normal)));
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Geom::Coord dist = Geom::L2((*k).first - p_proj); // distance from node to the guide
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Geom::Coord dist2 = Geom::L2(p - p_proj); // distance from projection of node on the guide, to the mouse location
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if ((dist < tol && dist2 < tol) || getSnapperAlwaysSnap()) {
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s = SnappedPoint((*k).first, SNAPSOURCE_GUIDE, static_cast<Inkscape::SnapTargetType>((*k).second), dist, tol, getSnapperAlwaysSnap(), true);
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sc.points.push_back(s);
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* Returns index of first NR_END bpath in array.
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void Inkscape::ObjectSnapper::_collectPaths(Inkscape::SnapPreferences::PointType const &t,
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bool const &first_point) const
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// Now, let's first collect all paths to snap to. If we have a whole bunch of points to snap,
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// e.g. when translating an item using the selector tool, then we will only do this for the
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// first point and store the collection for later use. This significantly improves the performance
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// Determine the type of bounding box we should snap to
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SPItem::BBoxType bbox_type = SPItem::GEOMETRIC_BBOX;
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bool p_is_a_node = t & Inkscape::SnapPreferences::SNAPPOINT_NODE;
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bool p_is_a_guide = t & Inkscape::SnapPreferences::SNAPPOINT_GUIDE;
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if (_snapmanager->snapprefs.getSnapToBBoxPath()) {
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Inkscape::Preferences *prefs = Inkscape::Preferences::get();
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int prefs_bbox = prefs->getBool("/tools/bounding_box", 0);
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bbox_type = !prefs_bbox ?
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SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
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// Consider the page border for snapping
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if (_snapmanager->snapprefs.getSnapToPageBorder()) {
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Geom::PathVector *border_path = _getBorderPathv();
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if (border_path != NULL) {
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_paths_to_snap_to->push_back(std::make_pair(border_path, SNAPTARGET_PAGE_BORDER));
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for (std::vector<SnapCandidate>::const_iterator i = _candidates->begin(); i != _candidates->end(); i++) {
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/* Transform the requested snap point to this item's coordinates */
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Geom::Matrix i2doc(Geom::identity());
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SPItem *root_item = NULL;
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/* We might have a clone at hand, so make sure we get the root item */
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if (SP_IS_USE((*i).item)) {
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i2doc = sp_use_get_root_transform(SP_USE((*i).item));
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root_item = sp_use_root(SP_USE((*i).item));
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g_return_if_fail(root_item);
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i2doc = sp_item_i2doc_affine((*i).item);
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root_item = (*i).item;
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//Build a list of all paths considered for snapping to
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//Add the item's path to snap to
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if (_snapmanager->snapprefs.getSnapToItemPath()) {
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if (p_is_a_guide || !(_snapmanager->snapprefs.getStrictSnapping() && !p_is_a_node)) {
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// Snapping to the path of characters is very cool, but for a large
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// chunk of text this will take ages! So limit snapping to text paths
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// containing max. 240 characters. Snapping the bbox will not be affected
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bool very_lenghty_prose = false;
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if (SP_IS_TEXT(root_item) || SP_IS_FLOWTEXT(root_item)) {
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very_lenghty_prose = sp_text_get_length(SP_TEXT(root_item)) > 240;
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// On my AMD 3000+, the snapping lag becomes annoying at approx. 240 chars
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// which corresponds to a lag of 500 msec. This is for snapping a rect
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// to a single line of text.
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// Snapping for example to a traced bitmap is also very stressing for
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// the CPU, so we'll only snap to paths having no more than 500 nodes
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// This also leads to a lag of approx. 500 msec (in my lousy test set-up).
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bool very_complex_path = false;
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if (SP_IS_PATH(root_item)) {
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very_complex_path = sp_nodes_in_path(SP_PATH(root_item)) > 500;
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if (!very_lenghty_prose && !very_complex_path) {
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SPCurve *curve = curve_for_item(root_item);
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// We will get our own copy of the path, which must be freed at some point
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Geom::PathVector *borderpathv = pathvector_for_curve(root_item, curve, true, true, Geom::identity(), (*i).additional_affine);
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_paths_to_snap_to->push_back(std::make_pair(borderpathv, SNAPTARGET_PATH)); // Perhaps for speed, get a reference to the Geom::pathvector, and store the transformation besides it.
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//Add the item's bounding box to snap to
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if (_snapmanager->snapprefs.getSnapToBBoxPath()) {
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if (p_is_a_guide || !(_snapmanager->snapprefs.getStrictSnapping() && p_is_a_node)) {
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// Discard the bbox of a clipped path / mask, because we don't want to snap to both the bbox
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// of the item AND the bbox of the clipping path at the same time
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if (!(*i).clip_or_mask) {
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sp_item_invoke_bbox(root_item, rect, i2doc, TRUE, bbox_type);
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Geom::PathVector *path = _getPathvFromRect(*rect);
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_paths_to_snap_to->push_back(std::make_pair(path, SNAPTARGET_BBOX_EDGE));
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void Inkscape::ObjectSnapper::_snapPaths(SnappedConstraints &sc,
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Inkscape::SnapPreferences::PointType const &t,
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Geom::Point const &p,
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SnapSourceType const &source_type,
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bool const &first_point,
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std::vector<std::pair<Geom::Point, int> > *unselected_nodes,
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SPPath const *selected_path) const
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_collectPaths(t, first_point);
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// Now we can finally do the real snapping, using the paths collected above
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g_assert(_snapmanager->getDesktop() != NULL);
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Geom::Point const p_doc = _snapmanager->getDesktop()->dt2doc(p);
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bool const node_tool_active = _snapmanager->snapprefs.getSnapToItemPath() && selected_path != NULL;
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/* findCandidates() is used for snapping to both paths and nodes. It ignores the path that is
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* currently being edited, because that path requires special care: when snapping to nodes
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* only the unselected nodes of that path should be considered, and these will be passed on separately.
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* This path must not be ignored however when snapping to the paths, so we add it here
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* manually when applicable.
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* Note that this path must be the last in line!
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if (node_tool_active) {
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SPCurve *curve = curve_for_item(SP_ITEM(selected_path));
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Geom::PathVector *pathv = pathvector_for_curve(SP_ITEM(selected_path), curve, true, true, Geom::identity(), Geom::identity()); // We will get our own copy of the path, which must be freed at some point
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_paths_to_snap_to->push_back(std::make_pair(pathv, SNAPTARGET_PATH));
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for (std::vector<std::pair<Geom::PathVector*, SnapTargetType> >::const_iterator it_p = _paths_to_snap_to->begin(); it_p != _paths_to_snap_to->end(); it_p++) {
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bool const being_edited = (node_tool_active && (*it_p) == _paths_to_snap_to->back());
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//if true then this pathvector it_pv is currently being edited in the node tool
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// char * svgd = sp_svg_write_path(**it_p->first);
460
// std::cout << "Dumping the pathvector: " << svgd << std::endl;
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for(Geom::PathVector::iterator it_pv = (it_p->first)->begin(); it_pv != (it_p->first)->end(); ++it_pv) {
463
// Find a nearest point for each curve within this path
464
// n curves will return n time values with 0 <= t <= 1
465
std::vector<double> anp = (*it_pv).nearestPointPerCurve(p_doc);
467
std::vector<double>::const_iterator np = anp.begin();
468
unsigned int index = 0;
469
for (; np != anp.end(); np++, index++) {
470
Geom::Curve const *curve = &((*it_pv).at_index(index));
471
Geom::Point const sp_doc = curve->pointAt(*np);
476
/* If the path is being edited, then we should only snap though to stationary pieces of the path
477
* and not to the pieces that are being dragged around. This way we avoid
478
* self-snapping. For this we check whether the nodes at both ends of the current
479
* piece are unselected; if they are then this piece must be stationary
481
g_assert(unselected_nodes != NULL);
482
Geom::Point start_pt = _snapmanager->getDesktop()->doc2dt(curve->pointAt(0));
483
Geom::Point end_pt = _snapmanager->getDesktop()->doc2dt(curve->pointAt(1));
484
c1 = isUnselectedNode(start_pt, unselected_nodes);
485
c2 = isUnselectedNode(end_pt, unselected_nodes);
486
/* Unfortunately, this might yield false positives for coincident nodes. Inkscape might therefore mistakenly
487
* snap to path segments that are not stationary. There are at least two possible ways to overcome this:
488
* - Linking the individual nodes of the SPPath we have here, to the nodes of the NodePath::SubPath class as being
489
* used in sp_nodepath_selected_nodes_move. This class has a member variable called "selected". For this the nodes
490
* should be in the exact same order for both classes, so we can index them
491
* - Replacing the SPPath being used here by the the NodePath::SubPath class; but how?
495
Geom::Point const sp_dt = _snapmanager->getDesktop()->doc2dt(sp_doc);
496
if (!being_edited || (c1 && c2)) {
497
Geom::Coord const dist = Geom::distance(sp_doc, p_doc);
498
if (dist < getSnapperTolerance()) {
499
sc.curves.push_back(Inkscape::SnappedCurve(sp_dt, dist, getSnapperTolerance(), getSnapperAlwaysSnap(), false, curve, source_type, it_p->second));
503
} // End of: for (Geom::PathVector::iterator ....)
507
/* Returns true if point is coincident with one of the unselected nodes */
508
bool Inkscape::ObjectSnapper::isUnselectedNode(Geom::Point const &point, std::vector<std::pair<Geom::Point, int> > const *unselected_nodes) const
510
if (unselected_nodes == NULL) {
514
if (unselected_nodes->size() == 0) {
518
for (std::vector<std::pair<Geom::Point, int> >::const_iterator i = unselected_nodes->begin(); i != unselected_nodes->end(); i++) {
519
if (Geom::L2(point - (*i).first) < 1e-4) {
527
void Inkscape::ObjectSnapper::_snapPathsConstrained(SnappedConstraints &sc,
528
Inkscape::SnapPreferences::PointType const &t,
529
Geom::Point const &p,
530
SnapSourceType const source_type,
531
bool const &first_point,
532
ConstraintLine const &c) const
535
_collectPaths(t, first_point);
537
// Now we can finally do the real snapping, using the paths collected above
539
g_assert(_snapmanager->getDesktop() != NULL);
540
Geom::Point const p_doc = _snapmanager->getDesktop()->dt2doc(p);
542
Geom::Point direction_vector = c.getDirection();
543
if (!is_zero(direction_vector)) {
544
direction_vector = Geom::unit_vector(direction_vector);
547
// The intersection point of the constraint line with any path,
548
// must lie within two points on the constraintline: p_min_on_cl and p_max_on_cl
549
// The distance between those points is twice the snapping tolerance
550
Geom::Point const p_proj_on_cl = c.projection(p);
551
Geom::Point const p_min_on_cl = _snapmanager->getDesktop()->dt2doc(p_proj_on_cl - getSnapperTolerance() * direction_vector);
552
Geom::Point const p_max_on_cl = _snapmanager->getDesktop()->dt2doc(p_proj_on_cl + getSnapperTolerance() * direction_vector);
555
std::vector<Geom::Path> clv;
556
cl.start(p_min_on_cl);
557
cl.appendNew<Geom::LineSegment>(p_max_on_cl);
560
for (std::vector<std::pair<Geom::PathVector*, SnapTargetType> >::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); k++) {
562
Geom::CrossingSet cs = Geom::crossings(clv, *(k->first));
564
// We need only the first element of cs, because cl is only a single straight linesegment
565
// This first element contains a vector filled with crossings of cl with k->first
566
for (std::vector<Geom::Crossing>::const_iterator m = cs[0].begin(); m != cs[0].end(); m++) {
567
if ((*m).ta >= 0 && (*m).ta <= 1 ) {
568
// Reconstruct the point of intersection
569
Geom::Point p_inters = p_min_on_cl + ((*m).ta) * (p_max_on_cl - p_min_on_cl);
570
// When it's within snapping range, then return it
571
// (within snapping range == between p_min_on_cl and p_max_on_cl == 0 < ta < 1)
572
Geom::Coord dist = Geom::L2(_snapmanager->getDesktop()->dt2doc(p_proj_on_cl) - p_inters);
573
SnappedPoint s(_snapmanager->getDesktop()->doc2dt(p_inters), source_type, k->second, dist, getSnapperTolerance(), getSnapperAlwaysSnap(), true);
574
sc.points.push_back(s);
583
void Inkscape::ObjectSnapper::freeSnap(SnappedConstraints &sc,
584
Inkscape::SnapPreferences::PointType const &t,
585
Geom::Point const &p,
586
SnapSourceType const &source_type,
587
bool const &first_point,
588
Geom::OptRect const &bbox_to_snap,
589
std::vector<SPItem const *> const *it,
590
std::vector<std::pair<Geom::Point, int> > *unselected_nodes) const
592
if (_snap_enabled == false || _snapmanager->snapprefs.getSnapFrom(t) == false ) {
596
/* Get a list of all the SPItems that we will try to snap to */
598
Geom::Rect const local_bbox_to_snap = bbox_to_snap ? *bbox_to_snap : Geom::Rect(p, p);
599
_findCandidates(sp_document_root(_snapmanager->getDocument()), it, first_point, local_bbox_to_snap, TRANSL_SNAP_XY, false, Geom::identity());
602
if (_snapmanager->snapprefs.getSnapToItemNode() || _snapmanager->snapprefs.getSnapSmoothNodes()
603
|| _snapmanager->snapprefs.getSnapToBBoxNode() || _snapmanager->snapprefs.getSnapToPageBorder()
604
|| _snapmanager->snapprefs.getSnapLineMidpoints() || _snapmanager->snapprefs.getSnapObjectMidpoints()
605
|| _snapmanager->snapprefs.getSnapBBoxEdgeMidpoints() || _snapmanager->snapprefs.getSnapBBoxMidpoints()
606
|| _snapmanager->snapprefs.getIncludeItemCenter()) {
607
_snapNodes(sc, t, p, source_type, first_point, unselected_nodes);
610
if (_snapmanager->snapprefs.getSnapToItemPath() || _snapmanager->snapprefs.getSnapToBBoxPath() || _snapmanager->snapprefs.getSnapToPageBorder()) {
611
unsigned n = (unselected_nodes == NULL) ? 0 : unselected_nodes->size();
613
/* While editing a path in the node tool, findCandidates must ignore that path because
614
* of the node snapping requirements (i.e. only unselected nodes must be snapable).
615
* That path must not be ignored however when snapping to the paths, so we add it here
616
* manually when applicable
620
if (it->size() == 1 && SP_IS_PATH(*it->begin())) {
621
path = SP_PATH(*it->begin());
622
} // else: *it->begin() might be a SPGroup, e.g. when editing a LPE of text that has been converted to a group of paths
623
// as reported in bug #356743. In that case we can just ignore it, i.e. not snap to this item
625
_snapPaths(sc, t, p, source_type, first_point, unselected_nodes, path);
627
_snapPaths(sc, t, p, source_type, first_point, NULL, NULL);
632
void Inkscape::ObjectSnapper::constrainedSnap( SnappedConstraints &sc,
633
Inkscape::SnapPreferences::PointType const &t,
634
Geom::Point const &p,
635
SnapSourceType const &source_type,
636
bool const &first_point,
637
Geom::OptRect const &bbox_to_snap,
638
ConstraintLine const &c,
639
std::vector<SPItem const *> const *it) const
641
if (_snap_enabled == false || _snapmanager->snapprefs.getSnapFrom(t) == false) {
645
/* Get a list of all the SPItems that we will try to snap to */
647
Geom::Rect const local_bbox_to_snap = bbox_to_snap ? *bbox_to_snap : Geom::Rect(p, p);
648
_findCandidates(sp_document_root(_snapmanager->getDocument()), it, first_point, local_bbox_to_snap, TRANSL_SNAP_XY, false, Geom::identity());
651
// A constrained snap, is a snap in only one degree of freedom (specified by the constraint line).
652
// This is useful for example when scaling an object while maintaining a fixed aspect ratio. It's
653
// nodes are only allowed to move in one direction (i.e. in one degree of freedom).
655
// When snapping to objects, we either snap to their nodes or their paths. It is however very
656
// unlikely that any node will be exactly at the constrained line, so for a constrained snap
657
// to objects we will only consider the object's paths. Beside, the nodes will be at these paths,
658
// so we will more or less snap to them anyhow.
660
if (_snapmanager->snapprefs.getSnapToItemPath() || _snapmanager->snapprefs.getSnapToBBoxPath() || _snapmanager->snapprefs.getSnapToPageBorder()) {
661
_snapPathsConstrained(sc, t, p, source_type, first_point, c);
666
// This method is used to snap a guide to nodes, while dragging the guide around
667
void Inkscape::ObjectSnapper::guideFreeSnap(SnappedConstraints &sc,
668
Geom::Point const &p,
669
Geom::Point const &guide_normal) const
671
/* Get a list of all the SPItems that we will try to snap to */
672
std::vector<SPItem*> cand;
673
std::vector<SPItem const *> const it; //just an empty list
675
DimensionToSnap snap_dim;
676
if (guide_normal == to_2geom(component_vectors[Geom::Y])) {
677
snap_dim = GUIDE_TRANSL_SNAP_Y;
678
} else if (guide_normal == to_2geom(component_vectors[Geom::X])) {
679
snap_dim = GUIDE_TRANSL_SNAP_X;
681
snap_dim = ANGLED_GUIDE_TRANSL_SNAP;
684
_findCandidates(sp_document_root(_snapmanager->getDocument()), &it, true, Geom::Rect(p, p), snap_dim, false, Geom::identity());
685
_snapTranslatingGuideToNodes(sc, Inkscape::SnapPreferences::SNAPPOINT_GUIDE, p, guide_normal);
686
// _snapRotatingGuideToNodes has not been implemented yet.
689
// This method is used to snap the origin of a guide to nodes/paths, while dragging the origin along the guide
690
void Inkscape::ObjectSnapper::guideConstrainedSnap(SnappedConstraints &sc,
691
Geom::Point const &p,
692
Geom::Point const &guide_normal,
693
ConstraintLine const &c) const
695
/* Get a list of all the SPItems that we will try to snap to */
696
std::vector<SPItem*> cand;
697
std::vector<SPItem const *> const it; //just an empty list
699
DimensionToSnap snap_dim;
700
if (guide_normal == to_2geom(component_vectors[Geom::Y])) {
701
snap_dim = GUIDE_TRANSL_SNAP_Y;
702
} else if (guide_normal == to_2geom(component_vectors[Geom::X])) {
703
snap_dim = GUIDE_TRANSL_SNAP_X;
705
snap_dim = ANGLED_GUIDE_TRANSL_SNAP;
708
_findCandidates(sp_document_root(_snapmanager->getDocument()), &it, true, Geom::Rect(p, p), snap_dim, false, Geom::identity());
709
_snapTranslatingGuideToNodes(sc, Inkscape::SnapPreferences::SNAPPOINT_GUIDE, p, guide_normal);
710
// _snapRotatingGuideToNodes has not been implemented yet.
714
* \return true if this Snapper will snap at least one kind of point.
716
bool Inkscape::ObjectSnapper::ThisSnapperMightSnap() const
718
bool snap_to_something = _snapmanager->snapprefs.getSnapToItemPath()
719
|| _snapmanager->snapprefs.getSnapToItemNode()
720
|| _snapmanager->snapprefs.getSnapToBBoxPath()
721
|| _snapmanager->snapprefs.getSnapToBBoxNode()
722
|| _snapmanager->snapprefs.getSnapToPageBorder()
723
|| _snapmanager->snapprefs.getSnapLineMidpoints() || _snapmanager->snapprefs.getSnapObjectMidpoints()
724
|| _snapmanager->snapprefs.getSnapBBoxEdgeMidpoints() || _snapmanager->snapprefs.getSnapBBoxMidpoints()
725
|| _snapmanager->snapprefs.getIncludeItemCenter();
727
return (_snap_enabled && _snapmanager->snapprefs.getSnapModeBBoxOrNodes() && snap_to_something);
730
bool Inkscape::ObjectSnapper::GuidesMightSnap() const // almost the same as ThisSnapperMightSnap above, but only looking at points (and not paths)
732
bool snap_to_something = _snapmanager->snapprefs.getSnapToItemNode()
733
|| _snapmanager->snapprefs.getSnapToPageBorder()
734
|| (_snapmanager->snapprefs.getSnapModeBBox() && _snapmanager->snapprefs.getSnapToBBoxNode())
735
|| (_snapmanager->snapprefs.getSnapModeBBox() && (_snapmanager->snapprefs.getSnapBBoxEdgeMidpoints() || _snapmanager->snapprefs.getSnapBBoxMidpoints()))
736
|| (_snapmanager->snapprefs.getSnapModeNode() && (_snapmanager->snapprefs.getSnapLineMidpoints() || _snapmanager->snapprefs.getSnapObjectMidpoints()))
737
|| (_snapmanager->snapprefs.getSnapModeNode() && _snapmanager->snapprefs.getIncludeItemCenter());
739
return (_snap_enabled && _snapmanager->snapprefs.getSnapModeGuide() && snap_to_something);
742
void Inkscape::ObjectSnapper::_clear_paths() const
744
for (std::vector<std::pair<Geom::PathVector*, SnapTargetType> >::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); k++) {
747
_paths_to_snap_to->clear();
750
Geom::PathVector* Inkscape::ObjectSnapper::_getBorderPathv() const
752
Geom::Rect const border_rect = Geom::Rect(Geom::Point(0,0), Geom::Point(sp_document_width(_snapmanager->getDocument()),sp_document_height(_snapmanager->getDocument())));
753
return _getPathvFromRect(border_rect);
756
Geom::PathVector* Inkscape::ObjectSnapper::_getPathvFromRect(Geom::Rect const rect) const
758
SPCurve const *border_curve = SPCurve::new_from_rect(rect);
760
Geom::PathVector *dummy = new Geom::PathVector(border_curve->get_pathvector());
767
void Inkscape::ObjectSnapper::_getBorderNodes(std::vector<std::pair<Geom::Point, int> > *points) const
769
Geom::Coord w = sp_document_width(_snapmanager->getDocument());
770
Geom::Coord h = sp_document_height(_snapmanager->getDocument());
771
points->push_back(std::make_pair(Geom::Point(0,0), SNAPTARGET_PAGE_CORNER));
772
points->push_back(std::make_pair(Geom::Point(0,h), SNAPTARGET_PAGE_CORNER));
773
points->push_back(std::make_pair(Geom::Point(w,h), SNAPTARGET_PAGE_CORNER));
774
points->push_back(std::make_pair(Geom::Point(w,0), SNAPTARGET_PAGE_CORNER));
777
void Inkscape::getBBoxPoints(Geom::OptRect const bbox, std::vector<std::pair<Geom::Point, int> > *points, bool const isTarget, bool const includeCorners, bool const includeLineMidpoints, bool const includeObjectMidpoints)
780
// collect the corners of the bounding box
781
for ( unsigned k = 0 ; k < 4 ; k++ ) {
782
if (includeCorners) {
783
points->push_back(std::make_pair((bbox->corner(k)), isTarget ? int(Inkscape::SNAPTARGET_BBOX_CORNER) : int(Inkscape::SNAPSOURCE_BBOX_CORNER)));
785
// optionally, collect the midpoints of the bounding box's edges too
786
if (includeLineMidpoints) {
787
points->push_back(std::make_pair((bbox->corner(k) + bbox->corner((k+1) % 4))/2, isTarget ? int(Inkscape::SNAPTARGET_BBOX_EDGE_MIDPOINT) : int(Inkscape::SNAPSOURCE_BBOX_EDGE_MIDPOINT)));
790
if (includeObjectMidpoints) {
791
points->push_back(std::make_pair(bbox->midpoint(), isTarget ? int(Inkscape::SNAPTARGET_BBOX_MIDPOINT) : int(Inkscape::SNAPSOURCE_BBOX_MIDPOINT)));
799
c-file-style:"stroustrup"
800
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
805
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
added
removed
inkscape-0.47pre1/src/object-snapper.cpp
