Exemplo n.º 1
0
/*
 * Converts all segments in all paths to Geom::LineSegment or Geom::HLineSegment or
 * Geom::VLineSegment or Geom::CubicBezier.
 */
Geom::PathVector
pathv_to_linear_and_cubic_beziers( Geom::PathVector const &pathv )
{
    Geom::PathVector output;

    for (Geom::PathVector::const_iterator pit = pathv.begin(); pit != pathv.end(); ++pit) {
        output.push_back( Geom::Path() );
        output.back().start( pit->initialPoint() );
        output.back().close( pit->closed() );

        for (Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_open(); ++cit) {
            if (is_straight_curve(*cit)) {
                Geom::LineSegment l(cit->initialPoint(), cit->finalPoint());
                output.back().append(l);
            } else {
                Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&*cit);
                if (curve && curve->order() == 3) {
                    Geom::CubicBezier b((*curve)[0], (*curve)[1], (*curve)[2], (*curve)[3]);
                    output.back().append(b);
                } else {
                    // convert all other curve types to cubicbeziers
                    Geom::Path cubicbezier_path = Geom::cubicbezierpath_from_sbasis(cit->toSBasis(), 0.1);
                    output.back().append(cubicbezier_path);
                }
            }
        }
    }
    
    return output;
}
Exemplo n.º 2
0
static void
sp_path_convert_to_guides(SPItem *item)
{
    SPPath *path = SP_PATH(item);

    if (!path->_curve) {
        return;
    }

    std::list<std::pair<Geom::Point, Geom::Point> > pts;

    Geom::Affine const i2dt(path->i2dt_affine());

    Geom::PathVector const & pv = path->_curve->get_pathvector();
    for(Geom::PathVector::const_iterator pit = pv.begin(); pit != pv.end(); ++pit) {
        for(Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_default(); ++cit) {
            // only add curves for straight line segments
            if( is_straight_curve(*cit) )
            {
                pts.push_back(std::make_pair(cit->initialPoint() * i2dt, cit->finalPoint() * i2dt));
            }
        }
    }

    sp_guide_pt_pairs_to_guides(item->document, pts);
}
Exemplo n.º 3
0
/*
 * Returns the number of segments of all paths summed
 * This count includes the closing line segment of a closed path.
 */
guint
SPCurve::get_segment_count() const
{
    guint nr = 0;
    for(Geom::PathVector::const_iterator it = _pathv.begin(); it != _pathv.end(); ++it) {
        nr += (*it).size();

        if (it->closed())   nr += 1;
    }
    return nr;
}
Exemplo n.º 4
0
/*
 * Converts all segments in all paths to Geom::LineSegment.  There is an intermediate
 * stage where some may be converted to beziers.  maxdisp is the maximum displacement from
 * the line segment to the bezier curve; ** maxdisp is not used at this moment **.
 *
 * This is NOT a terribly fast method, but it should give a solution close to the one with the
 * fewest points.
 */
Geom::PathVector
pathv_to_linear( Geom::PathVector const &pathv, double /*maxdisp*/)
{
    Geom::PathVector output;
    Geom::PathVector tmppath = pathv_to_linear_and_cubic_beziers(pathv);
    
    // Now all path segments are either already lines, or they are beziers.

    for (Geom::PathVector::const_iterator pit = tmppath.begin(); pit != tmppath.end(); ++pit) {
        output.push_back( Geom::Path() );
        output.back().start( pit->initialPoint() );
        output.back().close( pit->closed() );

        for (Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_open(); ++cit) {
            if (is_straight_curve(*cit)) {
                Geom::LineSegment ls(cit->initialPoint(), cit->finalPoint());
                output.back().append(ls);
            } 
            else { /* all others must be Bezier curves */
                Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&*cit);
                Geom::CubicBezier b((*curve)[0], (*curve)[1], (*curve)[2], (*curve)[3]);
                std::vector<Geom::Point> bzrpoints = b.points();
                Geom::Point A = bzrpoints[0];
                Geom::Point B = bzrpoints[1];
                Geom::Point C = bzrpoints[2];
                Geom::Point D = bzrpoints[3];
                std::vector<Geom::Point> pointlist;
                pointlist.push_back(A);
                recursive_bezier4(
                   A[X], A[Y], 
                   B[X], B[Y], 
                   C[X], C[Y], 
                   D[X], D[Y],
                   pointlist, 
                   0);
                pointlist.push_back(D);
                Geom::Point r1 = pointlist[0];
                for (unsigned int i=1; i<pointlist.size();i++){
                   Geom::Point prev_r1 = r1;
                   r1 = pointlist[i];
                   Geom::LineSegment ls(prev_r1, r1);
                   output.back().append(ls);
                }
                pointlist.clear();
           }
        }
    }
    
    return output;
}
Exemplo n.º 5
0
/**
 * True iff all subpaths are closed.
 * Returns false if the curve is empty.
 */
bool
SPCurve::is_closed() const
{
    if (is_empty()) {
        return false;
    } else {
        bool closed = true;
        for (Geom::PathVector::const_iterator it = _pathv.begin(); it != _pathv.end(); ++it) {
            if ( ! it->closed() ) {
                closed = false;
                break;
            }
        }
        return closed;
    }
}
Exemplo n.º 6
0
static std::vector<Geom::Point> approxCurveWithPoints(SPCurve *curve)
{
    // The number of segments to use for not straight curves approximation
    const unsigned NUM_SEGS = 4;
    
    const Geom::PathVector& curve_pv = curve->get_pathvector();
   
    // The structure to hold the output
    std::vector<Geom::Point> poly_points;

    // Iterate over all curves, adding the endpoints for linear curves and
    // sampling the other curves
    double seg_size = 1.0 / NUM_SEGS;
    double at;
    at = 0;
    Geom::PathVector::const_iterator pit = curve_pv.begin();
    while (pit != curve_pv.end())
    {
        Geom::Path::const_iterator cit = pit->begin();
        while (cit != pit->end())
        {
            if (cit == pit->begin())
            {
                poly_points.push_back(cit->initialPoint());
            }

            if (dynamic_cast<Geom::CubicBezier const*>(&*cit))
            {
                at += seg_size;
                if (at <= 1.0 )
                    poly_points.push_back(cit->pointAt(at));
                else
                {
                    at = 0.0;
                    ++cit;
                }
            }
            else
            {
                poly_points.push_back(cit->finalPoint());
                ++cit;
            }
        }
        ++pit;
    }
    return poly_points;
}
Exemplo n.º 7
0
/*
 * sp_svg_write_polygon: Write points attribute for polygon tag.
 * pathv may only contain paths with only straight line segments
 * Return value: points attribute string.
 */
static gchar *sp_svg_write_polygon(Geom::PathVector const & pathv)
{
    Inkscape::SVGOStringStream os;

    for (Geom::PathVector::const_iterator pit = pathv.begin(); pit != pathv.end(); ++pit) {
        for (Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_default(); ++cit) {
            if ( is_straight_curve(*cit) )
            {
                os << cit->finalPoint()[0] << "," << cit->finalPoint()[1] << " ";
            } else {
                g_error("sp_svg_write_polygon: polygon path contains non-straight line segments");
            }
        }
    }

    return g_strdup(os.str().c_str());
}
Exemplo n.º 8
0
Geom::OptRect
bounds_exact_transformed(Geom::PathVector const & pv, Geom::Affine const & t)
{
    if (pv.empty())
        return Geom::OptRect();

    Geom::Point initial = pv.front().initialPoint() * t;
    Geom::Rect bbox(initial, initial);        // obtain well defined bbox as starting point to unionWith

    for (Geom::PathVector::const_iterator it = pv.begin(); it != pv.end(); ++it) {
        bbox.expandTo(it->initialPoint() * t);

        // don't loop including closing segment, since that segment can never increase the bbox
        for (Geom::Path::const_iterator cit = it->begin(); cit != it->end_open(); ++cit) {
            Geom::Curve const &c = *cit;

            unsigned order = 0;
            if (Geom::BezierCurve const* b = dynamic_cast<Geom::BezierCurve const*>(&c)) {
                order = b->order();
            }

            if (order == 1) { // line segment
                bbox.expandTo(c.finalPoint() * t);

            // TODO: we can make the case for quadratics faster by degree elevating them to
            // cubic and then taking the bbox of that.

            } else if (order == 3) { // cubic bezier
                Geom::CubicBezier const &cubic_bezier = static_cast<Geom::CubicBezier const&>(c);
                Geom::Point c0 = cubic_bezier[0] * t;
                Geom::Point c1 = cubic_bezier[1] * t;
                Geom::Point c2 = cubic_bezier[2] * t;
                Geom::Point c3 = cubic_bezier[3] * t;
                cubic_bbox(c0[0], c0[1], c1[0], c1[1], c2[0], c2[1], c3[0], c3[1], bbox);
            } else {
                // should handle all not-so-easy curves:
                Geom::Curve *ctemp = cit->transformed(t);
                bbox.unionWith( ctemp->boundsExact());
                delete ctemp;
            }
        }
    }
    //return Geom::bounds_exact(pv * t);
    return bbox;
}
Exemplo n.º 9
0
Geom::OptRect
bounds_exact_transformed(Geom::PathVector const & pv, Geom::Affine const & t)
{
    if (pv.empty())
        return Geom::OptRect();

    Geom::Point initial = pv.front().initialPoint() * t;
    Geom::Rect bbox(initial, initial);        // obtain well defined bbox as starting point to unionWith

    for (Geom::PathVector::const_iterator it = pv.begin(); it != pv.end(); ++it) {
        bbox.expandTo(it->initialPoint() * t);

        // don't loop including closing segment, since that segment can never increase the bbox
        for (Geom::Path::const_iterator cit = it->begin(); cit != it->end_open(); ++cit) {
            Geom::Curve const &c = *cit;

            if( is_straight_curve(c) )
            {
                bbox.expandTo( c.finalPoint() * t );
            }
            else if(Geom::CubicBezier const *cubic_bezier = dynamic_cast<Geom::CubicBezier const  *>(&c))
            {
                Geom::Point c0 = (*cubic_bezier)[0] * t;
                Geom::Point c1 = (*cubic_bezier)[1] * t;
                Geom::Point c2 = (*cubic_bezier)[2] * t;
                Geom::Point c3 = (*cubic_bezier)[3] * t;
                cubic_bbox( c0[0], c0[1],
                            c1[0], c1[1],
                            c2[0], c2[1],
                            c3[0], c3[1],
                            bbox );
            }
            else
            {
                // should handle all not-so-easy curves:
                Geom::Curve *ctemp = cit->transformed(t);
                bbox.unionWith( ctemp->boundsExact());
                delete ctemp;
            }
        }
    }
    //return Geom::bounds_exact(pv * t);
    return bbox;
}
Exemplo n.º 10
0
/* Calculates...
   and returns ... in *wind and the distance to ... in *dist.
   Returns bounding box in *bbox if bbox!=NULL.
 */
void
pathv_matrix_point_bbox_wind_distance (Geom::PathVector const & pathv, Geom::Affine const &m, Geom::Point const &pt,
                         Geom::Rect *bbox, int *wind, Geom::Coord *dist,
                         Geom::Coord tolerance, Geom::Rect const *viewbox)
{
    if (pathv.empty()) {
        if (wind) *wind = 0;
        if (dist) *dist = Geom::infinity();
        return;
    }

    // remember last point of last curve
    Geom::Point p0(0,0);

    // remembering the start of subpath
    Geom::Point p_start(0,0);
    bool start_set = false;

    for (Geom::PathVector::const_iterator it = pathv.begin(); it != pathv.end(); ++it) {

        if (start_set) { // this is a new subpath
            if (wind && (p0 != p_start)) // for correct fill picking, each subpath must be closed
                geom_line_wind_distance (p0[X], p0[Y], p_start[X], p_start[Y], pt, wind, dist);
        }
        p0 = it->initialPoint() * m;
        p_start = p0;
        start_set = true;
        if (bbox) {
            bbox->expandTo(p0);
        }

        // loop including closing segment if path is closed
        for (Geom::Path::const_iterator cit = it->begin(); cit != it->end_default(); ++cit) {
            geom_curve_bbox_wind_distance(*cit, m, pt, bbox, wind, dist, tolerance, viewbox, p0);
        }
    }

    if (start_set) { 
        if (wind && (p0 != p_start)) // for correct picking, each subpath must be closed
            geom_line_wind_distance (p0[X], p0[Y], p_start[X], p_start[Y], pt, wind, dist);
    }
}
Exemplo n.º 11
0
// FIXME: why is 'transform' argument not used?
void
PrintLatex::print_pathvector(SVGOStringStream &os, Geom::PathVector const &pathv_in, const Geom::Affine & /*transform*/)
{
    if (pathv_in.empty())
        return;

//    Geom::Affine tf=transform;   // why was this here?
    Geom::Affine tf_stack=m_tr_stack.top(); // and why is transform argument not used?
    Geom::PathVector pathv = pathv_in * tf_stack; // generates new path, which is a bit slow, but this doesn't have to be performance optimized

    os << "\\newpath\n";

    for(Geom::PathVector::const_iterator it = pathv.begin(); it != pathv.end(); ++it) {

        os << "\\moveto(" << it->initialPoint()[Geom::X] << "," << it->initialPoint()[Geom::Y] << ")\n";

        for(Geom::Path::const_iterator cit = it->begin(); cit != it->end_open(); ++cit) {
            print_2geomcurve(os, *cit);
        }

        if (it->closed()) {
            os << "\\closepath\n";
        }

    }
}
Exemplo n.º 12
0
/**
 * returns the number of nodes in a path, used for statusbar text when selecting an spcurve.
 * Sum of nodes in all the paths. When a path is closed, and its closing line segment is of zero-length,
 * this function will not count the closing knot double (so basically ignores the closing line segment when it has zero length)
 */
guint
SPCurve::nodes_in_path() const
{
    guint nr = 0;
    for(Geom::PathVector::const_iterator it = _pathv.begin(); it != _pathv.end(); ++it) {
        nr += (*it).size();

        nr++; // count last node (this works also for closed paths because although they don't have a 'last node', they do have an extra segment

        // do not count closing knot double for zero-length closing line segments
        // however, if the path is only a moveto, and is closed, do not subtract 1 (otherwise the result will be zero nodes)
        if ( it->closed()
                && ((*it).size() != 0) )
        {
            Geom::Curve const &c = it->back_closed();
            if (are_near(c.initialPoint(), c.finalPoint())) {
                nr--;
            }
        }
    }

    return nr;
}