526c8bf9bb41b582dc49f54ac192705de9e2edf2mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "svg/svg.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "libnr/nr-path.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "libnr/nr-rect-ops.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "libnr/nr-point-fns.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include <2geom/path-intersection.h>

9d2da14dec9f62765544a573f9151d83b85d0909mental#include <2geom/point.h>

9d2da14dec9f62765544a573f9151d83b85d0909mental#include <2geom/rect.h>

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "document.h"

648401434273d7165b6346f9d04675b138464d2fKris#include "sp-namedview.h"

ad83b521a557c8a2d91c469f74137ca4ff4ab2d1mental#include "sp-image.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "sp-item-group.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "sp-item.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "sp-use.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "display/curve.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "desktop.h"

648401434273d7165b6346f9d04675b138464d2fKris#include "inkscape.h"

648401434273d7165b6346f9d04675b138464d2fKris#include "prefs-utils.h"

648401434273d7165b6346f9d04675b138464d2fKris#include "sp-text.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "sp-flowtext.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "text-editing.h"

be6c4327fc304962b439fd503536678e029ad51dmental#include "sp-clippath.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "sp-mask.h"

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental#include "helper/geom-curves.h"

17eb9e57e1550f744916bf486947162aa523bddamental

17eb9e57e1550f744916bf486947162aa523bddamentalInkscape::SnapCandidate::SnapCandidate(SPItem* item, bool clip_or_mask, NR::Matrix additional_affine)

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental : item(item), clip_or_mask(clip_or_mask), additional_affine(additional_affine)

9d2da14dec9f62765544a573f9151d83b85d0909mental{

9d2da14dec9f62765544a573f9151d83b85d0909mental}

9d2da14dec9f62765544a573f9151d83b85d0909mental

9d2da14dec9f62765544a573f9151d83b85d0909mentalInkscape::SnapCandidate::~SnapCandidate()

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental{

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental}

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mentalInkscape::ObjectSnapper::ObjectSnapper(SPNamedView const *nv, NR::Coord const d)

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental : Snapper(nv, d), _snap_to_itemnode(true), _snap_to_itempath(true),

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental _snap_to_bboxnode(true), _snap_to_bboxpath(true), _snap_to_page_border(false),

9982f495cde2750b1c6446bfb152af73ab981512Johan Engelen _strict_snapping(true), _include_item_center(false)

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental{

17eb9e57e1550f744916bf486947162aa523bddamental _candidates = new std::vector<SnapCandidate>;

ad83b521a557c8a2d91c469f74137ca4ff4ab2d1mental _points_to_snap_to = new std::vector<NR::Point>;

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental _paths_to_snap_to = new std::vector<Geom::PathVector*>;

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental}

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mentalInkscape::ObjectSnapper::~ObjectSnapper()

648401434273d7165b6346f9d04675b138464d2fKris{

648401434273d7165b6346f9d04675b138464d2fKris _candidates->clear();

648401434273d7165b6346f9d04675b138464d2fKris delete _candidates;

648401434273d7165b6346f9d04675b138464d2fKris

7079a43aa387066c2f67402d77dbe3db981b1054Ted Gould _points_to_snap_to->clear();

7079a43aa387066c2f67402d77dbe3db981b1054Ted Gould delete _points_to_snap_to;

ad83b521a557c8a2d91c469f74137ca4ff4ab2d1mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental _clear_paths();

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental delete _paths_to_snap_to;

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental}

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental

526c8bf9bb41b582dc49f54ac192705de9e2edf2mentalvoid Inkscape::ObjectSnapper::_findCandidates(SPObject* parent,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental std::vector<SPItem const *> const *it,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental bool const &first_point,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental NR::Rect const &bbox_to_snap,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental DimensionToSnap const snap_dim,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental bool const clip_or_mask,

526c8bf9bb41b582dc49f54ac192705de9e2edf2mental NR::Matrix const additional_affine) const // transformation of the item being clipped / masked

a4030d5ca449e7e384bc699cd249ee704faaeab0Chris Morgan{

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;

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::vector<SPItem const *>::const_iterator i;

if (it != NULL) {

i = it->begin();

while (i != it->end() && *i != o) {

i++;

}

}

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(o, it, false, bbox_to_snap, snap_dim, false, NR::identity());

} else {

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,

sp_item_i2doc_affine(item) * matrix_to_desktop(additional_affine, item),

true);

} else {

sp_item_invoke_bbox(item, &bbox_of_item, 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::_snapTranslatingGuideToNodes(SnappedConstraints &sc,

Inkscape::Snapper::PointType const &t,

NR::Point const &p,

NR::Point const &guide_normal) const

{

// 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;

}

}

if (success) {

sc.points.push_back(s);

}

}

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 = 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;

}

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(), (*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();

}

}

}

}

//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(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

// TODO Diederik: shouldn't we just make all snapping code use document

// coordinates instead? Then we won't need a pointer to the desktop any longer

// At least we should define a clear boundary between those different coordinates,

// now this is not well defined

SPDesktop const *desktop = SP_ACTIVE_DESKTOP;

Geom::Point const p_doc = 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

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

// 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;

// Find a nearest point for each curve within this path

// (path->allNearestPoints() will not do this for us! It was originally

// intended to find for example multiple equidistant solutions)

unsigned int num_curves = (*it_pv).size();

if ( (*it_pv).closed() ) ++num_curves;

for (double t = 0; (t+1) <= double(num_curves); t++) {

// Find a nearest point with time value in the range [t, t+1]

anp.push_back((*it_pv).nearestPoint(p_doc, t, t+1));

}

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

g_assert(unselected_nodes != NULL);

c1 = isUnselectedNode(start_pt, unselected_nodes);

c2 = isUnselectedNode(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 || (c1 && 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)));

sc.curves.push_back(Inkscape::SnappedCurve(from_2geom(sp_dt), dist, getSnapperTolerance(), getSnapperAlwaysSnap(), curve));

}

}

}

} // End of: for (Geom::PathVector::iterator ....)

}

}

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;

}

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

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);

}

}

}

}

}

}

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;

}

/* 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

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);

}

}

}

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);

}

}

void Inkscape::ObjectSnapper::guideSnap(SnappedConstraints &sc,

NR::Point const &p,

NR::Point const &guide_normal) const

{

if ( NULL == _named_view ) {

return;

}

/* Get a list of all the SPItems that we will try to snap to */

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.

}

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);

}

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);

}

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);

}

_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;

}

}

void Inkscape::ObjectSnapper::_getBorderNodes(std::vector<NR::Point> *points) const

{

Geom::Coord w = sp_document_width(_named_view->document);

Geom::Coord h = sp_document_height(_named_view->document);

points->push_back(Geom::Point(0,0));

points->push_back(Geom::Point(0,h));

points->push_back(Geom::Point(w,h));

points->push_back(Geom::Point(w,0));

}