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diff --git a/src/object-snapper.cpp b/src/object-snapper.cpp
index 4a21cbc04fbfd32677913accf22567219a1ad5aa..020a4793d81f232524716ecaa52d2a4c73305880 100644 (file)
--- a/src/object-snapper.cpp
+++ b/src/object-snapper.cpp
*
* Authors:
* Carl Hetherington <inkscape@carlh.net>
+ * Diederik van Lierop <mail@diedenrezi.nl>
*
- * Copyright (C) 2005 Authors
+ * Copyright (C) 2005 - 2008 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
-#include "libnr/n-art-bpath.h"
+#include "svg/svg.h"
+#include "libnr/nr-path.h"
#include "libnr/nr-rect-ops.h"
+#include "libnr/nr-point-fns.h"
+#include <2geom/path-intersection.h>
+#include <2geom/point.h>
+#include <2geom/rect.h>
#include "document.h"
#include "sp-namedview.h"
-#include "sp-path.h"
+#include "sp-image.h"
#include "sp-item-group.h"
+#include "sp-item.h"
+#include "sp-use.h"
#include "display/curve.h"
#include "desktop.h"
#include "inkscape.h"
-#include "splivarot.h"
+#include "prefs-utils.h"
+#include "sp-text.h"
+#include "sp-flowtext.h"
+#include "text-editing.h"
+#include "sp-clippath.h"
+#include "sp-mask.h"
+#include "helper/geom-curves.h"
+
+Inkscape::SnapCandidate::SnapCandidate(SPItem* item, bool clip_or_mask, NR::Matrix additional_affine)
+ : item(item), clip_or_mask(clip_or_mask), additional_affine(additional_affine)
+{
+}
+Inkscape::SnapCandidate::~SnapCandidate()
+{
+}
Inkscape::ObjectSnapper::ObjectSnapper(SPNamedView const *nv, NR::Coord const d)
- : Snapper(nv, d), _snap_to_nodes(true), _snap_to_paths(true)
+ : Snapper(nv, d), _snap_to_itemnode(true), _snap_to_itempath(true),
+ _snap_to_bboxnode(true), _snap_to_bboxpath(true), _snap_to_page_border(false),
+ _strict_snapping(true), _include_item_center(false)
{
-
+ _candidates = new std::vector<SnapCandidate>;
+ _points_to_snap_to = new std::vector<NR::Point>;
+ _paths_to_snap_to = new std::vector<Geom::PathVector*>;
}
+Inkscape::ObjectSnapper::~ObjectSnapper()
+{
+ _candidates->clear();
+ delete _candidates;
+
+ _points_to_snap_to->clear();
+ delete _points_to_snap_to;
+
+ _clear_paths();
+ delete _paths_to_snap_to;
+}
/**
- * \param p Point we are trying to snap (desktop coordinates)
+ * Find all items within snapping range.
+ * \param parent Pointer to the document's root, or to a clipped path or mask object
+ * \param it List of items to ignore
+ * \param first_point If true then this point is the first one from a whole bunch of points
+ * \param bbox_to_snap Bounding box hulling the whole bunch of points, all from the same selection and having the same transformation
+ * \param DimensionToSnap Snap in X, Y, or both directions.
*/
-void Inkscape::ObjectSnapper::_findCandidates(std::list<SPItem*>& c,
- SPObject* r,
- std::list<SPItem const *> const &it,
- NR::Point const &p) const
+void Inkscape::ObjectSnapper::_findCandidates(SPObject* parent,
+ std::vector<SPItem const *> const *it,
+ bool const &first_point,
+ NR::Rect const &bbox_to_snap,
+ DimensionToSnap const snap_dim,
+ bool const clip_or_mask,
+ NR::Matrix const additional_affine) const // transformation of the item being clipped / masked
{
+ bool const c1 = (snap_dim == TRANSL_SNAP_XY) && ThisSnapperMightSnap();
+ bool const c2 = (snap_dim != TRANSL_SNAP_XY) && GuidesMightSnap();
+
+ if (!(c1 || c2)) {
+ return;
+ }
+
SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
- for (SPObject* o = sp_object_first_child(r); o != NULL; o = SP_OBJECT_NEXT(o)) {
- if (SP_IS_ITEM(o) && !SP_ITEM(o)->isLocked() && !desktop->itemIsHidden(SP_ITEM(o))) {
+ if (first_point) {
+ _candidates->clear();
+ }
+
+ boost::optional<NR::Rect> bbox_of_item = NR::Rect(); // a default NR::Rect is infinitely large
+ NR::Rect bbox_to_snap_incl = bbox_to_snap; // _incl means: will include the snapper tolerance
+ bbox_to_snap_incl.growBy(getSnapperTolerance()); // see?
+
+ for (SPObject* o = sp_object_first_child(parent); o != NULL; o = SP_OBJECT_NEXT(o)) {
+ if (SP_IS_ITEM(o) && !SP_ITEM(o)->isLocked() && !(desktop->itemIsHidden(SP_ITEM(o)) && !clip_or_mask)) {
+ // Don't snap to locked items, and
+ // don't snap to hidden objects, unless they're a clipped path or a mask
/* See if this item is on the ignore list */
- std::list<SPItem const *>::const_iterator i = it.begin();
- while (i != it.end() && *i != o) {
- i++;
+ std::vector<SPItem const *>::const_iterator i;
+ if (it != NULL) {
+ i = it->begin();
+ while (i != it->end() && *i != o) {
+ i++;
+ }
}
-
- if (i == it.end()) {
- /* See if the item is within range */
+
+ if (it == NULL || i == it->end()) {
+ SPItem *item = SP_ITEM(o);
+ NR::Matrix transform = NR::identity();
+ if (item) {
+ SPObject *obj = NULL;
+ if (clip_or_mask) { // If the current item is a clipping path or a mask
+ // then store the transformation of the clipped path or mask itself
+ // but also take into account the additional affine of the object
+ // being clipped / masked
+ transform = item->transform * additional_affine;
+ } else { // cannot clip or mask more than once
+ // The current item is not a clipping path or a mask, but might
+ // still be the subject of clipping or masking itself ; if so, then
+ // we should also consider that path or mask for snapping to
+ obj = SP_OBJECT(item->clip_ref->getObject());
+ if (obj) {
+ _findCandidates(obj, it, false, bbox_to_snap, snap_dim, true, item->transform);
+ }
+ obj = SP_OBJECT(item->mask_ref->getObject());
+ if (obj) {
+ _findCandidates(obj, it, false, bbox_to_snap, snap_dim, true, item->transform);
+ }
+ }
+ }
+
if (SP_IS_GROUP(o)) {
- _findCandidates(c, o, it, p);
+ _findCandidates(o, it, false, bbox_to_snap, snap_dim, false, NR::identity());
} else {
- NR::Rect const b = NR::expand(sp_item_bbox_desktop(SP_ITEM(o)), -getDistance());
- if (b.contains(p)) {
- c.push_back(SP_ITEM(o));
+ if (clip_or_mask) {
+ // Oh oh, this will get ugly. We cannot use sp_item_i2d_affine directly because we need to
+ // insert an additional transformation in document coordinates (code copied from sp_item_i2d_affine)
+ sp_item_invoke_bbox(item,
+ &bbox_of_item,
+ from_2geom(sp_item_i2doc_affine(item) * matrix_to_desktop(to_2geom(additional_affine), item)),
+ true);
+
+ } else {
+ sp_item_invoke_bbox(item, &bbox_of_item, from_2geom(sp_item_i2d_affine(item)), true);
+ }
+ // See if the item is within range
+ if (bbox_of_item) {
+ if (bbox_to_snap_incl.intersects(*bbox_of_item)) {
+ // This item is within snapping range, so record it as a candidate
+ _candidates->push_back(SnapCandidate(item, clip_or_mask, additional_affine));
+ }
}
}
}
+ }
+ }
+}
+
+void Inkscape::ObjectSnapper::_collectNodes(Inkscape::Snapper::PointType const &t,
+ bool const &first_point) const
+{
+ // Now, let's first collect all points to snap to. If we have a whole bunch of points to snap,
+ // e.g. when translating an item using the selector tool, then we will only do this for the
+ // first point and store the collection for later use. This significantly improves the performance
+ if (first_point) {
+ _points_to_snap_to->clear();
+
+ // Determine the type of bounding box we should snap to
+ SPItem::BBoxType bbox_type = SPItem::GEOMETRIC_BBOX;
+
+ bool p_is_a_node = t & Inkscape::Snapper::SNAPPOINT_NODE;
+ bool p_is_a_bbox = t & Inkscape::Snapper::SNAPPOINT_BBOX;
+ bool p_is_a_guide = t & Inkscape::Snapper::SNAPPOINT_GUIDE;
+
+ // A point considered for snapping should be either a node, a bbox corner or a guide. Pick only ONE!
+ 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));
+
+ if (_snap_to_bboxnode) {
+ int prefs_bbox = prefs_get_int_attribute("tools", "bounding_box", 0);
+ bbox_type = (prefs_bbox == 0)?
+ SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
+ }
+
+ // Consider the page border for snapping
+ if (_snap_to_page_border) {
+ _getBorderNodes(_points_to_snap_to);
+ }
+
+ for (std::vector<SnapCandidate>::const_iterator i = _candidates->begin(); i != _candidates->end(); i++) {
+ //NR::Matrix i2doc(NR::identity());
+ SPItem *root_item = (*i).item;
+ if (SP_IS_USE((*i).item)) {
+ root_item = sp_use_root(SP_USE((*i).item));
+ }
+ g_return_if_fail(root_item);
+
+ //Collect all nodes so we can snap to them
+ if (_snap_to_itemnode) {
+ if (!(_strict_snapping && !p_is_a_node) || p_is_a_guide) {
+ sp_item_snappoints(root_item, _include_item_center, SnapPointsIter(*_points_to_snap_to));
+ }
+ }
+
+ //Collect the bounding box's corners so we can snap to them
+ if (_snap_to_bboxnode) {
+ if (!(_strict_snapping && !p_is_a_bbox) || p_is_a_guide) {
+ // Discard the bbox of a clipped path / mask, because we don't want to snap to both the bbox
+ // of the item AND the bbox of the clipping path at the same time
+ if (!(*i).clip_or_mask) {
+ boost::optional<NR::Rect> b = sp_item_bbox_desktop(root_item, bbox_type);
+ if (b) {
+ for ( unsigned k = 0 ; k < 4 ; k++ ) {
+ _points_to_snap_to->push_back(b->corner(k));
+ }
+ }
+ }
+ }
+ }
}
}
}
+void Inkscape::ObjectSnapper::_snapNodes(SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
+ NR::Point const &p,
+ bool const &first_point,
+ std::vector<NR::Point> *unselected_nodes) const
+{
+ // Iterate through all nodes, find out which one is the closest to p, and snap to it!
+
+ _collectNodes(t, first_point);
+
+ if (unselected_nodes != NULL) {
+ _points_to_snap_to->insert(_points_to_snap_to->end(), unselected_nodes->begin(), unselected_nodes->end());
+ }
+
+ SnappedPoint s;
+ bool success = false;
+
+ for (std::vector<NR::Point>::const_iterator k = _points_to_snap_to->begin(); k != _points_to_snap_to->end(); k++) {
+ NR::Coord dist = NR::L2(*k - p);
+ if (dist < getSnapperTolerance() && dist < s.getDistance()) {
+ s = SnappedPoint(*k, SNAPTARGET_NODE, dist, getSnapperTolerance(), getSnapperAlwaysSnap());
+ success = true;
+ }
+ }
+
+ if (success) {
+ sc.points.push_back(s);
+ }
+}
-void Inkscape::ObjectSnapper::_snapNodes(Inkscape::SnappedPoint &s,
+void Inkscape::ObjectSnapper::_snapTranslatingGuideToNodes(SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
NR::Point const &p,
- std::list<SPItem*> const &cand) const
+ NR::Point const &guide_normal) const
{
- /* FIXME: this seems like a hack. Perhaps Snappers should be
- ** in SPDesktop rather than SPNamedView?
- */
- SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
+ // Iterate through all nodes, find out which one is the closest to this guide, and snap to it!
+ _collectNodes(t, true);
+
+ SnappedPoint s;
+ bool success = false;
+
+ NR::Coord tol = getSnapperTolerance();
+
+ for (std::vector<NR::Point>::const_iterator k = _points_to_snap_to->begin(); k != _points_to_snap_to->end(); k++) {
+ // Project each node (*k) on the guide line (running through point p)
+ NR::Point p_proj = project_on_linesegment(*k, p, p + NR::rot90(guide_normal));
+ NR::Coord dist = NR::L2(*k - p_proj); // distance from node to the guide
+ NR::Coord dist2 = NR::L2(p - p_proj); // distance from projection of node on the guide, to the mouse location
+ if ((dist < tol && dist2 < tol || getSnapperAlwaysSnap()) && dist < s.getDistance()) {
+ s = SnappedPoint(*k, SNAPTARGET_NODE, dist, tol, getSnapperAlwaysSnap());
+ success = true;
+ }
+ }
- for (std::list<SPItem*>::const_iterator i = cand.begin(); i != cand.end(); i++) {
- if (SP_IS_SHAPE(*i)) {
+ if (success) {
+ sc.points.push_back(s);
+ }
+}
- SPShape const *sh = SP_SHAPE(*i);
- if (sh->curve) {
- int j = 0;
- NR::Matrix const i2doc = sp_item_i2doc_affine(*i);
+/**
+ * Returns index of first NR_END bpath in array.
+ */
- while (SP_CURVE_BPATH(sh->curve)[j].code != NR_END) {
+/* Obsolete
+static unsigned sp_bpath_length(NArtBpath const bpath[])
+{
+ g_return_val_if_fail(bpath != NULL, FALSE);
+ unsigned ret = 0;
+ while ( bpath[ret].code != NR_END ) {
+ ++ret;
+ }
+ ++ret;
+ return ret;
+}*/
- /* Get this node in desktop coordinates */
- NArtBpath const &bp = SP_CURVE_BPATH(sh->curve)[j];
- NR::Point const n = desktop->doc2dt(bp.c(3) * i2doc);
+void Inkscape::ObjectSnapper::_collectPaths(Inkscape::Snapper::PointType const &t,
+ bool const &first_point) const
+{
+ // Now, let's first collect all paths to snap to. If we have a whole bunch of points to snap,
+ // e.g. when translating an item using the selector tool, then we will only do this for the
+ // first point and store the collection for later use. This significantly improves the performance
+ if (first_point) {
+ _clear_paths();
+
+ // Determine the type of bounding box we should snap to
+ SPItem::BBoxType bbox_type = SPItem::GEOMETRIC_BBOX;
+
+ bool p_is_a_node = t & Inkscape::Snapper::SNAPPOINT_NODE;
+
+ if (_snap_to_bboxpath) {
+ int prefs_bbox = prefs_get_int_attribute("tools", "bounding_box", 0);
+ bbox_type = (prefs_bbox ==0)?
+ SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
+ }
+
+ // Consider the page border for snapping
+ if (_snap_to_page_border) {
+ Geom::PathVector *border_path = _getBorderPathv();
+ if (border_path != NULL) {
+ _paths_to_snap_to->push_back(border_path);
+ }
+ }
+
+ for (std::vector<SnapCandidate>::const_iterator i = _candidates->begin(); i != _candidates->end(); i++) {
+
+ /* Transform the requested snap point to this item's coordinates */
+ NR::Matrix i2doc(NR::identity());
+ SPItem *root_item = NULL;
+ /* We might have a clone at hand, so make sure we get the root item */
+ if (SP_IS_USE((*i).item)) {
+ i2doc = sp_use_get_root_transform(SP_USE((*i).item));
+ root_item = sp_use_root(SP_USE((*i).item));
+ g_return_if_fail(root_item);
+ } else {
+ i2doc = from_2geom(sp_item_i2doc_affine((*i).item));
+ root_item = (*i).item;
+ }
+
+ //Build a list of all paths considered for snapping to
+
+ //Add the item's path to snap to
+ if (_snap_to_itempath) {
+ if (!(_strict_snapping && !p_is_a_node)) {
+ // Snapping to the path of characters is very cool, but for a large
+ // chunk of text this will take ages! So limit snapping to text paths
+ // containing max. 240 characters. Snapping the bbox will not be affected
+ bool very_lenghty_prose = false;
+ if (SP_IS_TEXT(root_item) || SP_IS_FLOWTEXT(root_item)) {
+ very_lenghty_prose = sp_text_get_length(SP_TEXT(root_item)) > 240;
+ }
+ // On my AMD 3000+, the snapping lag becomes annoying at approx. 240 chars
+ // which corresponds to a lag of 500 msec. This is for snapping a rect
+ // to a single line of text.
+
+ // Snapping for example to a traced bitmap is also very stressing for
+ // the CPU, so we'll only snap to paths having no more than 500 nodes
+ // This also leads to a lag of approx. 500 msec (in my lousy test set-up).
+ bool very_complex_path = false;
+ if (SP_IS_PATH(root_item)) {
+ very_complex_path = sp_nodes_in_path(SP_PATH(root_item)) > 500;
+ }
- /* Try to snap to this node of the path */
- NR::Coord const dist = NR::L2(n - p);
- if (dist < getDistance() && dist < s.getDistance()) {
- s = SnappedPoint(n, dist);
+ if (!very_lenghty_prose && !very_complex_path) {
+ SPCurve *curve = curve_for_item(root_item);
+ if (curve) {
+ // We will get our own copy of the path, which must be freed at some point
+ Geom::PathVector *borderpathv = pathvector_for_curve(root_item, curve, true, true, Geom::identity(), to_2geom((*i).additional_affine));
+ _paths_to_snap_to->push_back(borderpathv); // Perhaps for speed, get a reference to the Geom::pathvector, and store the transformation besides it.
+ curve->unref();
+ }
}
+ }
+ }
- j++;
+ //Add the item's bounding box to snap to
+ if (_snap_to_bboxpath) {
+ if (!(_strict_snapping && p_is_a_node)) {
+ // Discard the bbox of a clipped path / mask, because we don't want to snap to both the bbox
+ // of the item AND the bbox of the clipping path at the same time
+ if (!(*i).clip_or_mask) {
+ NRRect rect;
+ sp_item_invoke_bbox(root_item, &rect, i2doc, TRUE, bbox_type);
+ Geom::Rect const rect2 = to_2geom(*rect.upgrade());
+ Geom::PathVector *path = _getPathvFromRect(rect2);
+ _paths_to_snap_to->push_back(path);
+ }
}
}
}
}
}
-
-
-void Inkscape::ObjectSnapper::_snapPaths(Inkscape::SnappedPoint &s,
- NR::Point const &p,
- std::list<SPItem*> const &cand) const
+
+void Inkscape::ObjectSnapper::_snapPaths(SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
+ NR::Point const &p,
+ bool const &first_point,
+ std::vector<NR::Point> *unselected_nodes,
+ SPPath const *selected_path) const
{
+ _collectPaths(t, first_point);
+ // Now we can finally do the real snapping, using the paths collected above
+
/* FIXME: this seems like a hack. Perhaps Snappers should be
** in SPDesktop rather than SPNamedView?
*/
- SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
-
- NR::Point const p_doc = desktop->dt2doc(p);
-
- for (std::list<SPItem*>::const_iterator i = cand.begin(); i != cand.end(); i++) {
-
- /* Transform the requested snap point to this item's coordinates */
- NR::Matrix const i2doc = sp_item_i2doc_affine(*i);
- NR::Point const p_it = p_doc * i2doc.inverse();
+ SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
+ Geom::Point const p_doc = to_2geom(desktop->dt2doc(p));
+
+ bool const node_tool_active = _snap_to_itempath && selected_path != NULL;
+
+ if (first_point) {
+ /* While editing a path in the node tool, findCandidates must ignore that path because
+ * of the node snapping requirements (i.e. only unselected nodes must be snapable).
+ * This path must not be ignored however when snapping to the paths, so we add it here
+ * manually when applicable.
+ *
+ * Note that this path must be the last in line!
+ * */
+ if (node_tool_active) {
+ SPCurve *curve = curve_for_item(SP_ITEM(selected_path));
+ if (curve) {
+ 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
+ _paths_to_snap_to->push_back(pathv);
+ curve->unref();
+ }
+ }
+ }
+
+ for (std::vector<Geom::PathVector*>::const_iterator it_p = _paths_to_snap_to->begin(); it_p != _paths_to_snap_to->end(); it_p++) {
+ bool const being_edited = (node_tool_active && (*it_p) == _paths_to_snap_to->back());
+
+ //if true then this pathvector it_pv is currently being edited in the node tool
+ SnappedPoint s;
+ bool success = false;
+
+ // char * svgd = sp_svg_write_path(**it_p);
+ // std::cout << "Dumping the pathvector: " << svgd << std::endl;
+
+ for(Geom::PathVector::iterator it_pv = (*it_p)->begin(); it_pv != (*it_p)->end(); ++it_pv) {
+ std::vector<double> anp = (*it_pv).allNearestPoints(p_doc);
+ for (std::vector<double>::const_iterator np = anp.begin(); np != anp.end(); np++) {
+ bool c1 = true;
+ bool c2 = true;
+ Geom::Point start_pt = desktop->doc2dt((*it_pv).pointAt(floor(*np)));
+ Geom::Point end_pt = desktop->doc2dt((*it_pv).pointAt(ceil(*np)));
+ if (being_edited) {
+ /* If the path is being edited, then we should only snap though to stationary pieces of the path
+ * and not to the pieces that are being dragged around. This way we avoid
+ * self-snapping. For this we check whether the nodes at both ends of the current
+ * piece are unselected; if they are then this piece must be stationary
+ */
+ g_assert(unselected_nodes != NULL);
+ c1 = isUnselectedNode(from_2geom(start_pt), unselected_nodes);
+ c2 = isUnselectedNode(from_2geom(end_pt), unselected_nodes);
+ }
+
+ Geom::Point const sp_doc = (*it_pv).pointAt(*np);
+ Geom::Point const sp_dt = desktop->doc2dt(sp_doc);
+
+ if (!being_edited || (c2 && c2)) {
+ NR::Coord const dist = Geom::distance(sp_doc, p_doc);
+
+ if (dist < getSnapperTolerance()) {
+ double t = MIN(*np, (*it_pv).size()); // make sure that t is within bounds;
+ //Geom::Curve const & curve = (*it_pv).at_index(int(t));
+ if(is_straight_curve((*it_pv).at_index(int(t)))) {
+ // if we snap to a line segment, then return this line segment (leaves 1 DOF for snapping)
+ sc.lines.push_back(Inkscape::SnappedLineSegment(from_2geom(sp_dt), dist, getSnapperTolerance(), getSnapperAlwaysSnap(), from_2geom(start_pt), from_2geom(end_pt)));
+ } else {
+ // for curves other than line segments, we'll return just the closest snapped point
+ // (this is a fully constrained snap, no degrees of freedom left)
+ if (dist < s.getDistance()) {
+ // If this curve has multiple segments, then we will return only
+ // a single snapped point
+ s = SnappedPoint(from_2geom(sp_dt), SNAPTARGET_PATH, dist, getSnapperTolerance(), getSnapperAlwaysSnap());
+ success = true;
+ }
+ }
+ }
+ }
+ }
+ } // End of: for (Geom::PathVector::iterator ....)
+
+ // Return a snap point for each path in our collection.
+ // (unless we've already snapped to a line segment, see above)
+ if (success) {
+ sc.points.push_back(s);
+ }
+
+ }
+}
- Path *livarot_path = Path_for_item(*i, true, true);
- if (!livarot_path)
- continue;
+/* Returns true if point is coincident with one of the unselected nodes */
+bool Inkscape::ObjectSnapper::isUnselectedNode(NR::Point const &point, std::vector<NR::Point> const *unselected_nodes) const
+{
+ if (unselected_nodes == NULL) {
+ return false;
+ }
+
+ if (unselected_nodes->size() == 0) {
+ return false;
+ }
+
+ for (std::vector<NR::Point>::const_iterator i = unselected_nodes->begin(); i != unselected_nodes->end(); i++) {
+ if (NR::L2(point - *i) < 1e-4) {
+ return true;
+ }
+ }
+
+ return false;
+}
- livarot_path->ConvertWithBackData(0.01);
+void Inkscape::ObjectSnapper::_snapPathsConstrained(SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
+ NR::Point const &p,
+ bool const &first_point,
+ ConstraintLine const &c) const
+{
+
+ _collectPaths(t, first_point);
+
+ // Now we can finally do the real snapping, using the paths collected above
+
+ /* FIXME: this seems like a hack. Perhaps Snappers should be
+ ** in SPDesktop rather than SPNamedView?
+ */
+ SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
+ NR::Point const p_doc = desktop->dt2doc(p);
+
+ NR::Point direction_vector = c.getDirection();
+ if (!is_zero(direction_vector)) {
+ direction_vector = NR::unit_vector(direction_vector);
+ }
+
+ NR::Point const p1_on_cl = c.hasPoint() ? c.getPoint() : p;
+ NR::Point const p2_on_cl = p1_on_cl + direction_vector;
+
+ // The intersection point of the constraint line with any path,
+ // must lie within two points on the constraintline: p_min_on_cl and p_max_on_cl
+ // The distance between those points is twice the snapping tolerance
+ NR::Point const p_proj_on_cl = project_on_linesegment(p, p1_on_cl, p2_on_cl);
+ NR::Point const p_min_on_cl = desktop->dt2doc(p_proj_on_cl - getSnapperTolerance() * direction_vector);
+ NR::Point const p_max_on_cl = desktop->dt2doc(p_proj_on_cl + getSnapperTolerance() * direction_vector);
+
+ Geom::Path cl;
+ std::vector<Geom::Path> clv;
+ cl.start(p_min_on_cl);
+ cl.appendNew<Geom::LineSegment>(p_max_on_cl);
+ clv.push_back(cl);
+
+ for (std::vector<Geom::PathVector*>::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); k++) {
+ if (*k) {
+ Geom::CrossingSet cs = Geom::crossings(clv, *(*k));
+ if (cs.size() > 0) {
+ // We need only the first element of cs, because cl is only a single straight linesegment
+ // This first element contains a vector filled with crossings of cl with *k
+ for (std::vector<Geom::Crossing>::const_iterator m = cs[0].begin(); m != cs[0].end(); m++) {
+ if ((*m).ta >= 0 && (*m).ta <= 1 ) {
+ // Reconstruct the point of intersection
+ NR::Point p_inters = p_min_on_cl + ((*m).ta) * (p_max_on_cl - p_min_on_cl);
+ // When it's within snapping range, then return it
+ // (within snapping range == between p_min_on_cl and p_max_on_cl == 0 < ta < 1)
+ NR::Coord dist = NR::L2(desktop->dt2doc(p_proj_on_cl) - p_inters);
+ SnappedPoint s(desktop->doc2dt(p_inters), SNAPTARGET_PATH, dist, getSnapperTolerance(), getSnapperAlwaysSnap());
+ sc.points.push_back(s);
+ }
+ }
+ }
+ }
+ }
+}
- /* Look for the nearest position on this SPItem to our snap point */
- NR::Maybe<Path::cut_position> const o = get_nearest_position_on_Path(livarot_path, p_it);
- if (o && o->t >= 0 && o->t <= 1) {
- /* Convert the nearest point back to desktop coordinates */
- NR::Point const o_it = get_point_on_Path(livarot_path, o.assume().piece, o.assume().t);
- NR::Point const o_dt = desktop->doc2dt(o_it * i2doc);
+void Inkscape::ObjectSnapper::freeSnap(SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
+ NR::Point const &p,
+ bool const &first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap,
+ std::vector<SPItem const *> const *it,
+ std::vector<NR::Point> *unselected_nodes) const
+{
+ if (_snap_enabled == false || getSnapFrom(t) == false || _named_view == NULL) {
+ return;
+ }
- NR::Coord const dist = NR::L2(o_dt - p);
- if (dist < getDistance() && dist < s.getDistance()) {
- s = SnappedPoint(o_dt, dist);
+ /* Get a list of all the SPItems that we will try to snap to */
+ if (first_point) {
+ NR::Rect const local_bbox_to_snap = bbox_to_snap ? *bbox_to_snap : NR::Rect(p, p);
+ _findCandidates(sp_document_root(_named_view->document), it, first_point, local_bbox_to_snap, TRANSL_SNAP_XY, false, NR::identity());
+ }
+
+ if (_snap_to_itemnode || _snap_to_bboxnode || _snap_to_page_border) {
+ _snapNodes(sc, t, p, first_point, unselected_nodes);
+ }
+
+ if (_snap_to_itempath || _snap_to_bboxpath || _snap_to_page_border) {
+ unsigned n = (unselected_nodes == NULL) ? 0 : unselected_nodes->size();
+ if (n > 0) {
+ /* While editing a path in the node tool, findCandidates must ignore that path because
+ * of the node snapping requirements (i.e. only unselected nodes must be snapable).
+ * That path must not be ignored however when snapping to the paths, so we add it here
+ * manually when applicable
+ */
+ SPPath *path = NULL;
+ if (it != NULL) {
+ g_assert(SP_IS_PATH(*it->begin()));
+ g_assert(it->size() == 1);
+ path = SP_PATH(*it->begin());
}
- }
+ _snapPaths(sc, t, p, first_point, unselected_nodes, path);
+ } else {
+ _snapPaths(sc, t, p, first_point, NULL, NULL);
+ }
+ }
+}
- delete livarot_path;
+void Inkscape::ObjectSnapper::constrainedSnap( SnappedConstraints &sc,
+ Inkscape::Snapper::PointType const &t,
+ NR::Point const &p,
+ bool const &first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap,
+ ConstraintLine const &c,
+ std::vector<SPItem const *> const *it) const
+{
+ if (_snap_enabled == false || getSnapFrom(t) == false || _named_view == NULL) {
+ return;
}
+ /* Get a list of all the SPItems that we will try to snap to */
+ if (first_point) {
+ NR::Rect const local_bbox_to_snap = bbox_to_snap ? *bbox_to_snap : NR::Rect(p, p);
+ _findCandidates(sp_document_root(_named_view->document), it, first_point, local_bbox_to_snap, TRANSL_SNAP_XY, false, NR::identity());
+ }
+
+ // A constrained snap, is a snap in only one degree of freedom (specified by the constraint line).
+ // This is usefull for example when scaling an object while maintaining a fixed aspect ratio. It's
+ // nodes are only allowed to move in one direction (i.e. in one degree of freedom).
+
+ // When snapping to objects, we either snap to their nodes or their paths. It is however very
+ // unlikely that any node will be exactly at the constrained line, so for a constrained snap
+ // to objects we will only consider the object's paths. Beside, the nodes will be at these paths,
+ // so we will more or less snap to them anyhow.
+
+ if (_snap_to_itempath || _snap_to_bboxpath || _snap_to_page_border) {
+ _snapPathsConstrained(sc, t, p, first_point, c);
+ }
}
-Inkscape::SnappedPoint Inkscape::ObjectSnapper::_doFreeSnap(NR::Point const &p,
- std::list<SPItem const *> const &it) const
+// This method is used to snap a guide to nodes, while dragging the guide around
+void Inkscape::ObjectSnapper::guideSnap(SnappedConstraints &sc,
+ NR::Point const &p,
+ NR::Point const &guide_normal) const
{
if ( NULL == _named_view ) {
- return SnappedPoint(p, NR_HUGE);
+ return;
}
-
+
/* Get a list of all the SPItems that we will try to snap to */
- std::list<SPItem*> cand;
- _findCandidates(cand, sp_document_root(_named_view->document), it, p);
+ std::vector<SPItem*> cand;
+ std::vector<SPItem const *> const it; //just an empty list
+
+ DimensionToSnap snap_dim;
+ if (guide_normal == component_vectors[NR::Y]) {
+ snap_dim = GUIDE_TRANSL_SNAP_Y;
+ } else if (guide_normal == component_vectors[NR::X]) {
+ snap_dim = GUIDE_TRANSL_SNAP_X;
+ } else {
+ snap_dim = ANGLED_GUIDE_TRANSL_SNAP;
+ }
+
+ // We don't support ANGLED_GUIDE_ROT_SNAP yet.
+
+ // It would be cool to allow the user to rotate a guide by dragging it, instead of
+ // only translating it. (For example when CTRL is pressed). We will need an UI part
+ // for that first; and some important usability choices need to be made:
+ // E.g. which point should be used for pivoting? A previously snapped point,
+ // or a transformation center (which can be moved after clicking for the
+ // second time on an object; but should this point then be constrained to the
+ // line, or can it be located anywhere?)
+
+ _findCandidates(sp_document_root(_named_view->document), &it, true, NR::Rect(p, p), snap_dim, false, NR::identity());
+ _snapTranslatingGuideToNodes(sc, Inkscape::Snapper::SNAPPOINT_GUIDE, p, guide_normal);
+ // _snapRotatingGuideToNodes has not been implemented yet.
+}
+
+/**
+ * \return true if this Snapper will snap at least one kind of point.
+ */
+bool Inkscape::ObjectSnapper::ThisSnapperMightSnap() const
+{
+ bool snap_to_something = _snap_to_itempath || _snap_to_itemnode || _snap_to_bboxpath || _snap_to_bboxnode || _snap_to_page_border;
+ return (_snap_enabled && _snap_from != 0 && snap_to_something);
+}
- SnappedPoint s(p, NR_HUGE);
+bool Inkscape::ObjectSnapper::GuidesMightSnap() const
+{
+ bool snap_to_something = _snap_to_itemnode || _snap_to_bboxnode;
+ return (_snap_enabled && (_snap_from & SNAPPOINT_GUIDE) && snap_to_something);
+}
- if (_snap_to_nodes) {
- _snapNodes(s, p, cand);
- }
- if (_snap_to_paths) {
- _snapPaths(s, p, cand);
+void Inkscape::ObjectSnapper::_clear_paths() const
+{
+ for (std::vector<Geom::PathVector*>::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); k++) {
+ g_free(*k);
}
-
- return s;
+ _paths_to_snap_to->clear();
}
+Geom::PathVector* Inkscape::ObjectSnapper::_getBorderPathv() const
+{
+ Geom::Rect const border_rect = Geom::Rect(Geom::Point(0,0), Geom::Point(sp_document_width(_named_view->document),sp_document_height(_named_view->document)));
+ return _getPathvFromRect(border_rect);
+}
+Geom::PathVector* Inkscape::ObjectSnapper::_getPathvFromRect(Geom::Rect const rect) const
+{
+ SPCurve const *border_curve = SPCurve::new_from_rect(rect);
+ if (border_curve) {
+ Geom::PathVector *dummy = new Geom::PathVector(border_curve->get_pathvector());
+ return dummy;
+ } else {
+ return NULL;
+ }
+}
-Inkscape::SnappedPoint Inkscape::ObjectSnapper::_doConstrainedSnap(NR::Point const &p,
- ConstraintLine const &c,
- std::list<SPItem const *> const &it) const
+void Inkscape::ObjectSnapper::_getBorderNodes(std::vector<NR::Point> *points) const
{
- /* FIXME: this needs implementing properly; I think we have to do the
- ** intersection of c with the objects.
- */
- return _doFreeSnap(p, it);
+ Geom::Coord w = sp_document_width(_named_view->document);
+ Geom::Coord h = sp_document_height(_named_view->document);
+ points->push_back(from_2geom(Geom::Point(0,0)));
+ points->push_back(from_2geom(Geom::Point(0,h)));
+ points->push_back(from_2geom(Geom::Point(w,h)));
+ points->push_back(from_2geom(Geom::Point(w,0)));
}
/*