C++ SPCurve::get_pathvector方法代码示例

/**
 * Return a vector of PathVectors which contain all helperpaths that should be drawn by the effect.
 * This is the function called by external code like SPLPEItem.
 */
std::vector<Geom::PathVector>
Effect::getHelperPaths(SPLPEItem *lpeitem)
{
    std::vector<Geom::PathVector> hp_vec;

    if (!SP_IS_SHAPE(lpeitem)) {
//        g_print ("How to handle helperpaths for non-shapes?\n"); // non-shapes are for example SPGroups.
        return hp_vec;
    }

    // TODO: we can probably optimize this by using a lot more references
    //       rather than copying PathVectors all over the place
    if (show_orig_path) {
        // add original path to helperpaths
        SPCurve* curve = sp_shape_get_curve (SP_SHAPE(lpeitem));
        hp_vec.push_back(curve->get_pathvector());
    }

    // add other helperpaths provided by the effect itself
    addCanvasIndicators(lpeitem, hp_vec);

    // add helperpaths provided by the effect's parameters
    for (std::vector<Parameter *>::iterator p = param_vector.begin(); p != param_vector.end(); ++p) {
        (*p)->addCanvasIndicators(lpeitem, hp_vec);
    }

    return hp_vec;
}

static void
sp_group_perform_patheffect(SPGroup *group, SPGroup *topgroup, bool write)
{
    GSList const *item_list = sp_item_group_item_list(SP_GROUP(group));
    for ( GSList const *iter = item_list; iter; iter = iter->next ) {
        SPObject *subitem = static_cast<SPObject *>(iter->data);
        if (SP_IS_GROUP(subitem)) {
            sp_group_perform_patheffect(SP_GROUP(subitem), topgroup, write);
        } else if (SP_IS_SHAPE(subitem)) {
            SPCurve * c = NULL;
            if (SP_IS_PATH(subitem)) {
                c = SP_PATH(subitem)->get_original_curve();
            } else {
                c = SP_SHAPE(subitem)->getCurve();
            }
            // only run LPEs when the shape has a curve defined
            if (c) {
                sp_lpe_item_perform_path_effect(SP_LPE_ITEM(topgroup), c);
                SP_SHAPE(subitem)->setCurve(c, TRUE);

                if (write) {
                    Inkscape::XML::Node *repr = subitem->getRepr();
                    gchar *str = sp_svg_write_path(c->get_pathvector());
                    repr->setAttribute("d", str);
#ifdef GROUP_VERBOSE
g_message("sp_group_perform_patheffect writes 'd' attribute");
#endif
                    g_free(str);
                }

                c->unref();
            }
        }
    }
}

void SPUsePath::refresh_source()
{
    sourceDirty = false;
    delete originalPath;
    originalPath = NULL;

    // le mauvais cas: pas d'attribut d => il faut verifier que c'est une SPShape puis prendre le contour
    // [tr: The bad case: no d attribute.  Must check that it's a SPShape and then take the outline.]
    SPObject *refobj = sourceObject;
    if ( refobj == NULL ) return;
    
    SPItem *item = SP_ITEM(refobj);
    SPCurve *curve = NULL;

    if (SP_IS_SHAPE(item))
    {
        curve = SP_SHAPE(item)->getCurve();
    }
    else if (SP_IS_TEXT(item))
    {
        curve = SP_TEXT(item)->getNormalizedBpath();
    }
    else
    {
        return;
    }
        
    if (curve == NULL)
        return;

    originalPath = new Path;
    originalPath->LoadPathVector(curve->get_pathvector(), item->transform, true);
    curve->unref();
}

void
lpetool_update_measuring_items(LpeTool *lc)
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    for ( std::map<SPPath *, SPCanvasItem*>::iterator i = lc->measuring_items->begin();
          i != lc->measuring_items->end();
          ++i )
    {
        SPPath *path = i->first;
        SPCurve *curve = path->getCurve();
        Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2 = Geom::paths_to_pw(curve->get_pathvector());
        Inkscape::Util::Unit const * unit = NULL;
        if (prefs->getString("/tools/lpetool/unit").compare("")) {
            unit = unit_table.getUnit(prefs->getString("/tools/lpetool/unit"));
        } else {
            unit = unit_table.getUnit("px");
        }
        double lengthval = Geom::length(pwd2);
        lengthval = Inkscape::Util::Quantity::convert(lengthval, "px", unit);
        gchar *arc_length = g_strdup_printf("%.2f %s", lengthval, unit->abbr.c_str());
        sp_canvastext_set_text (SP_CANVASTEXT(i->second), arc_length);
        set_pos_and_anchor(SP_CANVASTEXT(i->second), pwd2, 0.5, 10);
        // TODO: must we free arc_length?
    }
}

void
sp_selected_path_reverse(SPDesktop *desktop)
{
    Inkscape::Selection *selection = desktop->getSelection();
    std::vector<SPItem*> items = selection->itemList();

    if (items.empty()) {
        desktop->getMessageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to reverse."));
        return;
    }


    // set "busy" cursor
    desktop->setWaitingCursor();

    bool did = false;
    desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Reversing paths..."));

    for (std::vector<SPItem*>::const_iterator i = items.begin(); i != items.end(); ++i){

        SPPath *path = dynamic_cast<SPPath *>(*i);
        if (!path) {
            continue;
        }

        did = true;

        SPCurve *rcurve = path->get_curve_reference()->create_reverse();

        gchar *str = sp_svg_write_path(rcurve->get_pathvector());
        if ( path->hasPathEffectRecursive() ) {
            path->getRepr()->setAttribute("inkscape:original-d", str);
        } else {
            path->getRepr()->setAttribute("d", str);
        }
        g_free(str);

        rcurve->unref();

        // reverse nodetypes order (Bug #179866)
        gchar *nodetypes = g_strdup(path->getRepr()->attribute("sodipodi:nodetypes"));
        if ( nodetypes ) {
            path->getRepr()->setAttribute("sodipodi:nodetypes", g_strreverse(nodetypes));
            g_free(nodetypes);
        }
    }

    desktop->clearWaitingCursor();

    if (did) {
        DocumentUndo::done(desktop->getDocument(), SP_VERB_SELECTION_REVERSE,
                           _("Reverse path"));
    } else {
        desktop->getMessageStack()->flash(Inkscape::ERROR_MESSAGE, _("<b>No paths</b> to reverse in the selection."));
    }
}

void
sp_selected_path_reverse(SPDesktop *desktop)
{
    Inkscape::Selection *selection = sp_desktop_selection(desktop);
    GSList *items = (GSList *) selection->itemList();

    if (!items) {
        sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to reverse."));
        return;
    }


    // set "busy" cursor
    desktop->setWaitingCursor();

    bool did = false;
    desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Reversing paths..."));

    for (GSList *i = items; i != NULL; i = i->next) {

        if (!SP_IS_PATH(i->data)) {
            continue;
        }

        did = true;
        SPPath *path = SP_PATH(i->data);

        SPCurve *rcurve = path->get_curve_reference()->create_reverse();

        gchar *str = sp_svg_write_path(rcurve->get_pathvector());
        if ( path->hasPathEffectRecursive() ) {
            path->getRepr()->setAttribute("inkscape:original-d", str);
        } else {
            path->getRepr()->setAttribute("d", str);
        }
        g_free(str);

        rcurve->unref();

        // reverse nodetypes order (Bug #179866)
        gchar *nodetypes = g_strdup(path->getRepr()->attribute("sodipodi:nodetypes"));
        if ( nodetypes ) {
            path->getRepr()->setAttribute("sodipodi:nodetypes", g_strreverse(nodetypes));
            g_free(nodetypes);
        }
    }

    desktop->clearWaitingCursor();

    if (did) {
        DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_SELECTION_REVERSE,
                           _("Reverse path"));
    } else {
        sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No paths</b> to reverse in the selection."));
    }
}

/**
 * Computes a point on the offset;  used to set a "seed" position for
 * the control knot.
 *
 * \return the topmost point on the offset.
 */
void
sp_offset_top_point (SPOffset const * offset, Geom::Point *px)
{
    (*px) = Geom::Point(0, 0);

    if (offset == NULL) {
        return;
    }

    if (offset->knotSet)
    {
        (*px) = offset->knot;
        return;
    }

    SPCurve *curve = SP_SHAPE (offset)->getCurve();

    if (curve == NULL)
    {
        // CPPIFY
        //offset->set_shape();
        const_cast<SPOffset*>(offset)->set_shape();

        curve = SP_SHAPE (offset)->getCurve();

        if (curve == NULL)
            return;
    }

    if (curve->is_empty())
    {
        curve->unref();
        return;
    }

    Path *finalPath = new Path;
    finalPath->LoadPathVector(curve->get_pathvector());

    Shape *theShape = new Shape;

    finalPath->Convert (1.0);
    finalPath->Fill (theShape, 0);

    if (theShape->hasPoints())
    {
        theShape->SortPoints ();
        *px = theShape->getPoint(0).x;
    }

    delete theShape;
    delete finalPath;
    curve->unref();
}

/**
 * Return new curve that is the concatenation of all curves in list.
 */
SPCurve *
SPCurve::concat(GSList const *list)
{
    SPCurve *new_curve = new SPCurve();

    for (GSList const *l = list; l != NULL; l = l->next) {
        SPCurve *c = static_cast<SPCurve *>(l->data);
        new_curve->_pathv.insert( new_curve->_pathv.end(), c->get_pathvector().begin(), c->get_pathvector().end() );
    }

    return new_curve;
}

void
SPLPEItem::apply_to_clip_or_mask_group(SPItem *group, SPItem *item)
{
    if (!SP_IS_GROUP(group)) {
        return;
    }
    GSList *item_list = sp_item_group_item_list(SP_GROUP(group));
    for ( GSList *iter = item_list; iter; iter = iter->next ) {
        SPObject *subitem = static_cast<SPObject *>(iter->data);
        if (SP_IS_GROUP(subitem)) {
            apply_to_clip_or_mask_group(SP_ITEM(subitem), item);
        } else if (SP_IS_SHAPE(subitem)) {
            SPCurve * c = NULL;

            if (SP_IS_PATH(subitem)) {
                c = SP_PATH(subitem)->get_original_curve();
            } else {
                c = SP_SHAPE(subitem)->getCurve();
            }
            if (c) {
                bool success = false;
                if(SP_IS_GROUP(group)){
                    c->transform(i2anc_affine(SP_GROUP(item), SP_GROUP(this)));
                    success = this->performPathEffect(c);
                    c->transform(i2anc_affine(SP_GROUP(item), SP_GROUP(this)).inverse());
                } else {
                    success = this->performPathEffect(c);
                }
                Inkscape::XML::Node *repr = subitem->getRepr();
                if (success) {
                    gchar *str = sp_svg_write_path(c->get_pathvector());
                    repr->setAttribute("d", str);
                    g_free(str);
                } else {
                    // LPE was unsuccesfull. Read the old 'd'-attribute.
                    if (gchar const * value = repr->attribute("d")) {
                        Geom::PathVector pv = sp_svg_read_pathv(value);
                        SPCurve *oldcurve = new SPCurve(pv);
                        if (oldcurve) {
                            SP_SHAPE(subitem)->setCurve(oldcurve, TRUE);
                            oldcurve->unref();
                        }
                    }
                }
                c->unref();
            }
        }
    }
}

void
lpetool_create_measuring_items(SPLPEToolContext *lc, Inkscape::Selection *selection)
{
    if (!selection) {
        selection = sp_desktop_selection(lc->desktop);
    }
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    bool show = prefs->getBool("/tools/lpetool/show_measuring_info",  true);

    SPPath *path;
    SPCurve *curve;
    SPCanvasText *canvas_text;
    SPCanvasGroup *tmpgrp = sp_desktop_tempgroup(lc->desktop);
    gchar *arc_length;
    double lengthval;

    for (GSList const *i = selection->itemList(); i != NULL; i = i->next) {
        if (SP_IS_PATH(i->data)) {
            path = SP_PATH(i->data);
            curve = sp_shape_get_curve(SP_SHAPE(path));
            Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2 = paths_to_pw(curve->get_pathvector());
            canvas_text = (SPCanvasText *) sp_canvastext_new(tmpgrp, lc->desktop, Geom::Point(0,0), "");
            if (!show)
                sp_canvas_item_hide(SP_CANVAS_ITEM(canvas_text));

            SPUnitId unitid = static_cast<SPUnitId>(prefs->getInt("/tools/lpetool/unitid", SP_UNIT_PX));
            SPUnit unit = sp_unit_get_by_id(unitid);

            lengthval = Geom::length(pwd2);
            gboolean success;
            success = sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), &unit);
            arc_length = g_strdup_printf("%.2f %s", lengthval, success ? sp_unit_get_abbreviation(&unit) : "px");
            sp_canvastext_set_text (canvas_text, arc_length);
            set_pos_and_anchor(canvas_text, pwd2, 0.5, 10);
            // TODO: must we free arc_length?
            (*lc->measuring_items)[path] = SP_CANVAS_ITEM(canvas_text);
        }
    }
}

void
KnotHolderEntityAttachPt::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)
{
    using namespace Geom;

    LPETangentToCurve* lpe = dynamic_cast<LPETangentToCurve *>(_effect);

    Geom::Point const s = snap_knot_position(p, state);

    // FIXME: There must be a better way of converting the path's SPCurve* to pwd2.
    SPCurve *curve = SP_PATH(item)->get_curve_for_edit();
    Geom::PathVector pathv = curve->get_pathvector();
    Piecewise<D2<SBasis> > pwd2;
    for (unsigned int i=0; i < pathv.size(); i++) {
        pwd2.concat(pathv[i].toPwSb());
    }

    double t0 = nearest_point(s, pwd2);
    lpe->t_attach.param_set_value(t0);

    // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
    sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
}

void
OriginalPathParam::linked_modified_callback(SPObject *linked_obj, guint /*flags*/)
{
    SPCurve *curve = NULL;
    if (SP_IS_SHAPE(linked_obj)) {
        curve = SP_SHAPE(linked_obj)->getCurveBeforeLPE();
    }
    if (SP_IS_TEXT(linked_obj)) {
        curve = SP_TEXT(linked_obj)->getNormalizedBpath();
    }

    if (curve == NULL) {
        // curve invalid, set empty pathvector
        _pathvector = Geom::PathVector();
    } else {
        _pathvector = curve->get_pathvector();
        curve->unref();
    }

    must_recalculate_pwd2 = true;
    emit_changed();
    SP_OBJECT(param_effect->getLPEObj())->requestModified(SP_OBJECT_MODIFIED_FLAG);
}

void
PathParam::linked_modified_callback(SPObject *linked_obj, guint /*flags*/)
{
    SPCurve *curve = NULL;
    if (SP_IS_SHAPE(linked_obj)) {
        curve = SP_SHAPE(linked_obj)->getCurve();
    }
    if (SP_IS_TEXT(linked_obj)) {
        curve = SP_TEXT(linked_obj)->getNormalizedBpath();
    }

    if (curve == NULL) {
        // curve invalid, set default value
        _pathvector = sp_svg_read_pathv(defvalue);
    } else {
        _pathvector = curve->get_pathvector();
        curve->unref();
    }

    must_recalculate_pwd2 = true;
    emit_changed();
    SP_OBJECT(param_effect->getLPEObj())->requestModified(SP_OBJECT_MODIFIED_FLAG);
}

void
sp_selected_path_break_apart(SPDesktop *desktop, bool skip_undo)
{
    Inkscape::Selection *selection = desktop->getSelection();

    if (selection->isEmpty()) {
        desktop->getMessageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to break apart."));
        return;
    }

    desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Breaking apart paths..."));
    // set "busy" cursor
    desktop->setWaitingCursor();

    bool did = false;

    std::vector<SPItem*> itemlist(selection->itemList());
    for (std::vector<SPItem*>::const_iterator i = itemlist.begin(); i != itemlist.end(); ++i){

        SPItem *item = *i;

        SPPath *path = dynamic_cast<SPPath *>(item);
        if (!path) {
            continue;
        }

        SPCurve *curve = path->get_curve_for_edit();
        if (curve == NULL) {
            continue;
        }
        did = true;

        Inkscape::XML::Node *parent = item->getRepr()->parent();
        gint pos = item->getRepr()->position();
        char const *id = item->getRepr()->attribute("id");

        // XML Tree being used directly here while it shouldn't be...
        gchar *style = g_strdup(item->getRepr()->attribute("style"));
        // XML Tree being used directly here while it shouldn't be...
        gchar *path_effect = g_strdup(item->getRepr()->attribute("inkscape:path-effect"));
        Geom::Affine transform = path->transform;
        // it's going to resurrect as one of the pieces, so we delete without advertisement
        item->deleteObject(false);


        GSList *list = curve->split();

        curve->unref();

        std::vector<Inkscape::XML::Node*> reprs;
        for (GSList *l = list; l != NULL; l = l->next) {
            curve = (SPCurve *) l->data;

            Inkscape::XML::Node *repr = parent->document()->createElement("svg:path");
            repr->setAttribute("style", style);

            repr->setAttribute("inkscape:path-effect", path_effect);

            gchar *str = sp_svg_write_path(curve->get_pathvector());
            if (path_effect)
                repr->setAttribute("inkscape:original-d", str);
            else
                repr->setAttribute("d", str);
            g_free(str);
            repr->setAttribute("transform", sp_svg_transform_write(transform));
            
            // add the new repr to the parent
            parent->appendChild(repr);

            // move to the saved position
            repr->setPosition(pos > 0 ? pos : 0);

            // if it's the first one, restore id
            if (l == list)
                repr->setAttribute("id", id);

            reprs.push_back(repr);

            Inkscape::GC::release(repr);
        }
        selection->setReprList(reprs);

        g_slist_free(list);
        g_free(style);
        g_free(path_effect);
    }

    desktop->clearWaitingCursor();

    if (did) {
        if ( !skip_undo ) {
            DocumentUndo::done(desktop->getDocument(), SP_VERB_SELECTION_BREAK_APART, 
                               _("Break apart"));
        }
    } else {
        desktop->getMessageStack()->flash(Inkscape::ERROR_MESSAGE, _("<b>No path(s)</b> to break apart in the selection."));
    }
}

void
LPESimplify::generateHelperPathAndSmooth(Geom::PathVector &result)
{
    if(steps < 1) {
        return;
    }
    Geom::PathVector tmp_path;
    Geom::CubicBezier const *cubic = NULL;
    for (Geom::PathVector::iterator path_it = result.begin(); path_it != result.end(); ++path_it) {
        if (path_it->empty()) {
            continue;
        }

        Geom::Path::iterator curve_it1 = path_it->begin(); // incoming curve
        Geom::Path::iterator curve_it2 = ++(path_it->begin());// outgoing curve
        Geom::Path::iterator curve_endit = path_it->end_default(); // this determines when the loop has to stop
        SPCurve *nCurve = new SPCurve();
        if (path_it->closed()) {
            // if the path is closed, maybe we have to stop a bit earlier because the
            // closing line segment has zerolength.
            const Geom::Curve &closingline =
                path_it->back_closed(); // the closing line segment is always of type
            // Geom::LineSegment.
            if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
                // closingline.isDegenerate() did not work, because it only checks for
                // *exact* zero length, which goes wrong for relative coordinates and
                // rounding errors...
                // the closing line segment has zero-length. So stop before that one!
                curve_endit = path_it->end_open();
            }
        }
        if(helper_size > 0) {
            drawNode(curve_it1->initialPoint());
        }
        nCurve->moveto(curve_it1->initialPoint());
        Geom::Point start = Geom::Point(0,0);
        while (curve_it1 != curve_endit) {
            cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it1);
            Geom::Point point_at1 = curve_it1->initialPoint();
            Geom::Point point_at2 = curve_it1->finalPoint();
            Geom::Point point_at3 = curve_it1->finalPoint();
            Geom::Point point_at4 = curve_it1->finalPoint();

            if(start == Geom::Point(0,0)) {
                start = point_at1;
            }

            if (cubic) {
                point_at1 = (*cubic)[1];
                point_at2 = (*cubic)[2];
            }

            if(path_it->closed() && curve_it2 == curve_endit) {
                point_at4 = start;
            }
            if(curve_it2 != curve_endit) {
                cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it2);
                if (cubic) {
                    point_at4 = (*cubic)[1];
                }
            }
            Geom::Ray ray1(point_at2, point_at3);
            Geom::Ray ray2(point_at3, point_at4);
            double angle1 = Geom::deg_from_rad(ray1.angle());
            double angle2 = Geom::deg_from_rad(ray2.angle());
            if((smooth_angles  >= std::abs(angle2 - angle1)) && !are_near(point_at4,point_at3) && !are_near(point_at2,point_at3)) {
                double dist = Geom::distance(point_at2,point_at3);
                Geom::Angle angleFixed = ray2.angle();
                angleFixed -= Geom::Angle::from_degrees(180.0);
                point_at2 =  Geom::Point::polar(angleFixed, dist) + point_at3;
            }
            nCurve->curveto(point_at1, point_at2, curve_it1->finalPoint());
            cubic = dynamic_cast<Geom::CubicBezier const *>(nCurve->last_segment());
            if (cubic) {
                point_at1 = (*cubic)[1];
                point_at2 = (*cubic)[2];
                if(helper_size > 0) {
                    if(!are_near((*cubic)[0],(*cubic)[1])) {
                        drawHandle((*cubic)[1]);
                        drawHandleLine((*cubic)[0],(*cubic)[1]);
                    }
                    if(!are_near((*cubic)[3],(*cubic)[2])) {
                        drawHandle((*cubic)[2]);
                        drawHandleLine((*cubic)[3],(*cubic)[2]);
                    }
                }
            }
            if(helper_size > 0) {
                drawNode(curve_it1->finalPoint());
            }
            ++curve_it1;
            ++curve_it2;
        }
        if (path_it->closed()) {
            nCurve->closepath_current();
        }
        tmp_path.push_back(nCurve->get_pathvector()[0]);
        nCurve->reset();
        delete nCurve;
    }
//.........这里部分代码省略.........