C++ Preferences::getBool方法代码示例

/// @todo investigate why Geom::Point p is passed in but ignored.
void Inkscape::ObjectSnapper::_collectPaths(Geom::Point /*p*/,
                                         SnapSourceType const source_type,
                                         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 = source_type & SNAPSOURCE_NODE_CATEGORY;
        bool p_is_a_bbox = source_type & SNAPSOURCE_BBOX_CATEGORY;
        bool p_is_other = (source_type & SNAPSOURCE_OTHERS_CATEGORY) || (source_type & SNAPSOURCE_DATUMS_CATEGORY);

        if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_EDGE)) {
            Preferences *prefs = Preferences::get();
            int prefs_bbox = prefs->getBool("/tools/bounding_box", 0);
            bbox_type = !prefs_bbox ?
                SPItem::VISUAL_BBOX : SPItem::GEOMETRIC_BBOX;
        }

        // Consider the page border for snapping
        if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PAGE_BORDER) && _snapmanager->snapprefs.isAnyCategorySnappable()) {
            Geom::PathVector *border_path = _getBorderPathv();
            if (border_path != NULL) {
                _paths_to_snap_to->push_back(SnapCandidatePath(border_path, SNAPTARGET_PAGE_BORDER, Geom::OptRect()));
            }
        }

        for (std::vector<SnapCandidateItem>::const_iterator i = _candidates->begin(); i != _candidates->end(); ++i) {

            /* Transform the requested snap point to this item's coordinates */
            Geom::Affine i2doc(Geom::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((*i).item)->get_root_transform();
                root_item = SP_USE((*i).item)->root();
                g_return_if_fail(root_item);
            } else {
                i2doc = (*i).item->i2doc_affine();
                root_item = (*i).item;
            }

            //Build a list of all paths considered for snapping to

            //Add the item's path to snap to
            if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH, SNAPTARGET_PATH_INTERSECTION, SNAPTARGET_TEXT_BASELINE)) {
                if (p_is_other || p_is_a_node || (!_snapmanager->snapprefs.getStrictSnapping() && p_is_a_bbox)) {
                    if (SP_IS_TEXT(root_item) || SP_IS_FLOWTEXT(root_item)) {
                        if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_TEXT_BASELINE)) {
                            // Snap to the text baseline
                            Text::Layout const *layout = te_get_layout(static_cast<SPItem *>(root_item));
                            if (layout != NULL && layout->outputExists()) {
                                Geom::PathVector *pv = new Geom::PathVector();
                                pv->push_back(layout->baseline() * root_item->i2dt_affine() * (*i).additional_affine * _snapmanager->getDesktop()->doc2dt());
                                _paths_to_snap_to->push_back(SnapCandidatePath(pv, SNAPTARGET_TEXT_BASELINE, Geom::OptRect()));
                            }
                        }
                    } else {
                        // Snapping for example to a traced bitmap is 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_PATH(root_item)->nodesInPath() > 500;
                        }

                        if (!very_complex_path && root_item && _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH, SNAPTARGET_PATH_INTERSECTION)) {
                            SPCurve *curve = NULL;
                            if (SP_IS_SHAPE(root_item)) {
                               curve = SP_SHAPE(root_item)->getCurve();
                            }/* else if (SP_IS_TEXT(root_item) || SP_IS_FLOWTEXT(root_item)) {
                               curve = te_get_layout(root_item)->convertToCurves();
                            }*/
                            if (curve) {
                                // We will get our own copy of the pathvector, which must be freed at some point

                                // Geom::PathVector *pv = pathvector_for_curve(root_item, curve, true, true, Geom::identity(), (*i).additional_affine);

                                Geom::PathVector *pv = new Geom::PathVector(curve->get_pathvector());
                                (*pv) *= root_item->i2dt_affine() * (*i).additional_affine * _snapmanager->getDesktop()->doc2dt(); // (_edit_transform * _i2d_transform);

                                _paths_to_snap_to->push_back(SnapCandidatePath(pv, SNAPTARGET_PATH, Geom::OptRect())); // 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 (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_EDGE)) {
                if (p_is_other || p_is_a_bbox || (!_snapmanager->snapprefs.getStrictSnapping() && 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
//.........这里部分代码省略.........

void Inkscape::ObjectSnapper::_findCandidates(SPObject* parent,
                                              std::vector<SPItem const *> const *it,
                                              bool const &first_point,
                                              Geom::Rect const &bbox_to_snap,
                                              bool const clip_or_mask,
                                              Geom::Affine const additional_affine) const // transformation of the item being clipped / masked
{
    SPDesktop const *dt = _snapmanager->getDesktop();
    if (dt == NULL) {
        g_warning("desktop == NULL, so we cannot snap; please inform the developers of this bug");
        // Apparently the setup() method from the SnapManager class hasn't been called before trying to snap.
    }

    if (first_point) {
        _candidates->clear();
    }

    Geom::Rect bbox_to_snap_incl = bbox_to_snap; // _incl means: will include the snapper tolerance
    bbox_to_snap_incl.expandBy(getSnapperTolerance()); // see?

    for ( SPObject *o = parent->firstChild(); o; o = o->getNext() ) {
        g_assert(dt != NULL);
        if (SP_IS_ITEM(o) && !(dt->itemIsHidden(SP_ITEM(o)) && !clip_or_mask)) {
            // Snapping to items in a locked layer is allowed
            // 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);
                if (item) {
                    if (!clip_or_mask) { // 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
                        SPObject *obj = SP_OBJECT(item->clip_ref ? item->clip_ref->getObject() : NULL);
                        if (obj && _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH_CLIP)) {
                            _findCandidates(obj, it, false, bbox_to_snap, true, item->i2doc_affine());
                        }
                        obj = SP_OBJECT(item->mask_ref ? item->mask_ref->getObject() : NULL);
                        if (obj && _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH_MASK)) {
                            _findCandidates(obj, it, false, bbox_to_snap, true, item->i2doc_affine());
                        }
                    }
                }

                if (SP_IS_GROUP(o)) {
                    _findCandidates(o, it, false, bbox_to_snap, clip_or_mask, additional_affine);
                } else {
                    Geom::OptRect bbox_of_item;
                    Preferences *prefs = Preferences::get();
                    int prefs_bbox = prefs->getBool("/tools/bounding_box", 0);
                    // We'll only need to obtain the visual bounding box if the user preferences tell
                    // us to, AND if we are snapping to the bounding box itself. If we're snapping to
                    // paths only, then we can just as well use the geometric bounding box (which is faster)
                    SPItem::BBoxType bbox_type = (!prefs_bbox && _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_CATEGORY)) ?
                        SPItem::VISUAL_BBOX : SPItem::GEOMETRIC_BBOX;
                    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)
                        bbox_of_item = item->bounds(bbox_type, item->i2doc_affine() * additional_affine * dt->doc2dt());
                    } else {
                        bbox_of_item = item->desktopBounds(bbox_type);
                    }
                    if (bbox_of_item) {
                        // See if the item is within range
                        if (bbox_to_snap_incl.intersects(*bbox_of_item)
                                || (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_ROTATION_CENTER) && bbox_to_snap_incl.contains(item->getCenter()))) { // rotation center might be outside of the bounding box
                            // This item is within snapping range, so record it as a candidate
                            _candidates->push_back(SnapCandidateItem(item, clip_or_mask, additional_affine));
                            // For debugging: print the id of the candidate to the console
                            // SPObject *obj = (SPObject*)item;
                            // std::cout << "Snap candidate added: " << obj->getId() << std::endl;
                        }
                    }
                }
            }
        }
    }
}

void Inkscape::ObjectSnapper::_collectNodes(SnapSourceType 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 & SNAPSOURCE_NODE_CATEGORY;
        bool p_is_a_bbox = t & SNAPSOURCE_BBOX_CATEGORY;
        bool p_is_other = (t & SNAPSOURCE_OTHERS_CATEGORY) || (t & SNAPSOURCE_DATUMS_CATEGORY);

        // A point considered for snapping should be either a node, a bbox corner or a guide/other. Pick only ONE!
        if (((p_is_a_node && p_is_a_bbox) || (p_is_a_bbox && p_is_other) || (p_is_a_node && p_is_other))) {
            g_warning("Snap warning: node type is ambiguous");
        }

        if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_CORNER, SNAPTARGET_BBOX_EDGE_MIDPOINT, SNAPTARGET_BBOX_MIDPOINT)) {
            Preferences *prefs = Preferences::get();
            bool prefs_bbox = prefs->getBool("/tools/bounding_box");
            bbox_type = !prefs_bbox ?
                SPItem::VISUAL_BBOX : SPItem::GEOMETRIC_BBOX;
        }

        // Consider the page border for snapping to
        if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PAGE_CORNER)) {
            _getBorderNodes(_points_to_snap_to);
        }

        for (std::vector<SnapCandidateItem>::const_iterator i = _candidates->begin(); i != _candidates->end(); ++i) {
            //Geom::Affine i2doc(Geom::identity());
            SPItem *root_item = (*i).item;
            if (SP_IS_USE((*i).item)) {
                root_item = SP_USE((*i).item)->root();
            }
            g_return_if_fail(root_item);

            //Collect all nodes so we can snap to them
            if (p_is_a_node || p_is_other || (p_is_a_bbox && !_snapmanager->snapprefs.getStrictSnapping())) {
                // Note: there are two ways in which intersections are considered:
                // Method 1: Intersections are calculated for each shape individually, for both the
                //           snap source and snap target (see sp_shape_snappoints)
                // Method 2: Intersections are calculated for each curve or line that we've snapped to, i.e. only for
                //           the target (see the intersect() method in the SnappedCurve and SnappedLine classes)
                // Some differences:
                // - Method 1 doesn't find intersections within a set of multiple objects
                // - Method 2 only works for targets
                // When considering intersections as snap targets:
                // - Method 1 only works when snapping to nodes, whereas
                // - Method 2 only works when snapping to paths
                // - There will be performance differences too!
                // If both methods are being used simultaneously, then this might lead to duplicate targets!

                // Well, here we will be looking for snap TARGETS. Both methods can therefore be used.
                // When snapping to paths, we will get a collection of snapped lines and snapped curves. findBestSnap() will
                // go hunting for intersections (but only when asked to in the prefs of course). In that case we can just
                // temporarily block the intersections in sp_item_snappoints, we don't need duplicates. If we're not snapping to
                // paths though but only to item nodes then we should still look for the intersections in sp_item_snappoints()
                bool old_pref = _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH_INTERSECTION);
                if (_snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_PATH)) {
                    // So if we snap to paths, then findBestSnap will find the intersections
                    // and therefore we temporarily disable SNAPTARGET_PATH_INTERSECTION, which will
                    // avoid root_item->getSnappoints() below from returning intersections
                    _snapmanager->snapprefs.setTargetSnappable(SNAPTARGET_PATH_INTERSECTION, false);
                }

                // We should not snap a transformation center to any of the centers of the items in the
                // current selection (see the comment in SelTrans::centerRequest())
                bool old_pref2 = _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_ROTATION_CENTER);
                if (old_pref2) {
                    for ( GSList const *itemlist = _snapmanager->getRotationCenterSource(); itemlist != NULL; itemlist = g_slist_next(itemlist) ) {
                        if ((*i).item == reinterpret_cast<SPItem*>(itemlist->data)) {
                            // don't snap to this item's rotation center
                            _snapmanager->snapprefs.setTargetSnappable(SNAPTARGET_ROTATION_CENTER, false);
                            break;
                        }
                    }
                }

                root_item->getSnappoints(*_points_to_snap_to, &_snapmanager->snapprefs);

                // restore the original snap preferences
                _snapmanager->snapprefs.setTargetSnappable(SNAPTARGET_PATH_INTERSECTION, old_pref);
                _snapmanager->snapprefs.setTargetSnappable(SNAPTARGET_ROTATION_CENTER, old_pref2);
            }

            //Collect the bounding box's corners so we can snap to them
            if (p_is_a_bbox || (!_snapmanager->snapprefs.getStrictSnapping() && p_is_a_node) || p_is_other) {
                // 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) {
                    Geom::OptRect b = root_item->desktopBounds(bbox_type);
                    getBBoxPoints(b, _points_to_snap_to, true,
                            _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_CORNER),
                            _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_EDGE_MIDPOINT),
                            _snapmanager->snapprefs.isTargetSnappable(SNAPTARGET_BBOX_MIDPOINT));
//.........这里部分代码省略.........