示例#1
0
static bool try_get_intersect_point_with_item_recursive(Geom::PathVector& conn_pv, SPItem* item,
        const Geom::Affine& item_transform, double& intersect_pos) {

    double initial_pos = intersect_pos;
    // if this is a group...
    if (SP_IS_GROUP(item)) {
        SPGroup* group = SP_GROUP(item);

        // consider all first-order children
        double child_pos = 0.0;
        std::vector<SPItem*> g = sp_item_group_item_list(group);
        for (std::vector<SPItem*>::const_iterator i = g.begin();i!=g.end();i++) {
            SPItem* child_item = *i;
            try_get_intersect_point_with_item_recursive(conn_pv, child_item,
                    item_transform * child_item->transform, child_pos);
            if (intersect_pos < child_pos)
                intersect_pos = child_pos;
        }
        return intersect_pos != initial_pos;
    }

    // if this is not a shape, nothing to be done
    if (!SP_IS_SHAPE(item)) return false;

    // make sure it has an associated curve
    SPCurve* item_curve = SP_SHAPE(item)->getCurve();
    if (!item_curve) return false;

    // apply transformations (up to common ancestor)
    item_curve->transform(item_transform);

    const Geom::PathVector& curve_pv = item_curve->get_pathvector();
    Geom::CrossingSet cross = crossings(conn_pv, curve_pv);
    // iterate over all Crossings
    //TODO: check correctness of the following code: inner loop uses loop variable
    //      with a name identical to the loop variable of the outer loop. Then rename.
    for (Geom::CrossingSet::const_iterator i = cross.begin(); i != cross.end(); ++i) {
        const Geom::Crossings& cr = *i;

        for (Geom::Crossings::const_iterator i = cr.begin(); i != cr.end(); ++i) {
            const Geom::Crossing& cr_pt = *i;
            if ( intersect_pos < cr_pt.ta)
                intersect_pos = cr_pt.ta;
        }
    }

    item_curve->unref();

    return intersect_pos != initial_pos;
}
示例#2
0
static bool try_get_intersect_point_with_item_recursive(Geom::PathVector& conn_pv, SPItem* item,
        const Geom::Matrix& item_transform, double& intersect_pos) {

    double initial_pos = intersect_pos;
    // if this is a group...
    if (SP_IS_GROUP(item)) {
        SPGroup* group = SP_GROUP(item);

        // consider all first-order children
        double child_pos = 0.0;
        for (GSList const* i = sp_item_group_item_list(group); i != NULL; i = i->next) {
            SPItem* child_item = SP_ITEM(i->data);
            try_get_intersect_point_with_item_recursive(conn_pv, child_item,
                    item_transform * child_item->transform, child_pos);
            if (intersect_pos < child_pos)
                intersect_pos = child_pos;
        }
        return intersect_pos != initial_pos;
    }

    // if this is not a shape, nothing to be done
    if (!SP_IS_SHAPE(item)) return false;

    // make sure it has an associated curve
    SPCurve* item_curve = sp_shape_get_curve(SP_SHAPE(item));
    if (!item_curve) return false;

    // apply transformations (up to common ancestor)
    item_curve->transform(item_transform);

    const Geom::PathVector& curve_pv = item_curve->get_pathvector();
    Geom::CrossingSet cross = crossings(conn_pv, curve_pv);
    // iterate over all Crossings
    for (Geom::CrossingSet::const_iterator i = cross.begin(); i != cross.end(); i++) {
        const Geom::Crossings& cr = *i;

        for (Geom::Crossings::const_iterator i = cr.begin(); i != cr.end(); i++) {
            const Geom::Crossing& cr_pt = *i;
            if ( intersect_pos < cr_pt.ta)
                intersect_pos = cr_pt.ta;
        }
    }

    item_curve->unref();

    return intersect_pos != initial_pos;
}
示例#3
0
void Inkscape::ObjectSnapper::_snapPathsConstrained(IntermSnapResults &isr,
                                     SnapCandidatePoint const &p,
                                     SnapConstraint const &c,
                                     Geom::Point const &p_proj_on_constraint) const
{

    _collectPaths(p_proj_on_constraint, p.getSourceType(), p.getSourceNum() <= 0);

    // Now we can finally do the real snapping, using the paths collected above

    SPDesktop const *dt = _snapmanager->getDesktop();
    g_assert(dt != NULL);

    Geom::Point direction_vector = c.getDirection();
    if (!is_zero(direction_vector)) {
        direction_vector = Geom::unit_vector(direction_vector);
    }

    // The intersection point of the constraint line with any path, must lie within two points on the
    // SnapConstraint: p_min_on_cl and p_max_on_cl. The distance between those points is twice the snapping tolerance
    Geom::Point const p_min_on_cl = dt->dt2doc(p_proj_on_constraint - getSnapperTolerance() * direction_vector);
    Geom::Point const p_max_on_cl = dt->dt2doc(p_proj_on_constraint + getSnapperTolerance() * direction_vector);
    Geom::Coord tolerance = getSnapperTolerance();

    // PS: Because the paths we're about to snap to are all expressed relative to document coordinate system, we will have
    // to convert the snapper coordinates from the desktop coordinates to document coordinates

    std::vector<Geom::Path> constraint_path;
    if (c.isCircular()) {
        Geom::Circle constraint_circle(dt->dt2doc(c.getPoint()), c.getRadius());
        constraint_circle.getPath(constraint_path);
    } else {
        Geom::Path constraint_line;
        constraint_line.start(p_min_on_cl);
        constraint_line.appendNew<Geom::LineSegment>(p_max_on_cl);
        constraint_path.push_back(constraint_line);
    }
    // Length of constraint_path will always be one

    bool strict_snapping = _snapmanager->snapprefs.getStrictSnapping();

    // Find all intersections of the constrained path with the snap target candidates
    std::vector<Geom::Point> intersections;
    for (std::vector<SnapCandidatePath >::const_iterator k = _paths_to_snap_to->begin(); k != _paths_to_snap_to->end(); ++k) {
        if (k->path_vector && _allowSourceToSnapToTarget(p.getSourceType(), (*k).target_type, strict_snapping)) {
            // Do the intersection math
            Geom::CrossingSet cs = Geom::crossings(constraint_path, *(k->path_vector));
            // Store the results as intersection points
            unsigned int index = 0;
            for (Geom::CrossingSet::const_iterator i = cs.begin(); i != cs.end(); ++i) {
                if (index >= constraint_path.size()) {
                    break;
                }
                // Reconstruct and store the points of intersection
                for (Geom::Crossings::const_iterator m = (*i).begin(); m != (*i).end(); ++m) {
                    intersections.push_back(constraint_path[index].pointAt((*m).ta));
                }
                index++;
            }

            //Geom::crossings will not consider the closing segment apparently, so we'll handle that separately here
            //TODO: This should have been fixed in rev. #9859, which makes this workaround obsolete
            for(Geom::PathVector::iterator it_pv = k->path_vector->begin(); it_pv != k->path_vector->end(); ++it_pv) {
                if (it_pv->closed()) {
                    // Get the closing linesegment and convert it to a path
                    Geom::Path cls;
                    cls.close(false);
                    cls.append(it_pv->back_closed());
                    // Intersect that closing path with the constrained path
                    Geom::Crossings cs = Geom::crossings(constraint_path.front(), cls);
                    // Reconstruct and store the points of intersection
                    index = 0; // assuming the constraint path vector has only one path
                    for (Geom::Crossings::const_iterator m = cs.begin(); m != cs.end(); ++m) {
                        intersections.push_back(constraint_path[index].pointAt((*m).ta));
                    }
                }
            }

            // Convert the collected points of intersection to snapped points
            for (std::vector<Geom::Point>::iterator p_inters = intersections.begin(); p_inters != intersections.end(); ++p_inters) {
                // Convert to desktop coordinates
                (*p_inters) = dt->doc2dt(*p_inters);
                // Construct a snapped point
                Geom::Coord dist = Geom::L2(p.getPoint() - *p_inters);
                SnappedPoint s = SnappedPoint(*p_inters, p.getSourceType(), p.getSourceNum(), k->target_type, dist, getSnapperTolerance(), getSnapperAlwaysSnap(), true, k->target_bbox);;
                // Store the snapped point
                if (dist <= tolerance) { // If the intersection is within snapping range, then we might snap to it
                    isr.points.push_back(s);
                }
            }
        }
    }
}