C++ SPCurve::transform方法代码示例

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();
            }
        }
    }
}

bool
SPConnEndPair::reroutePathFromLibavoid(void)
{
    if (!isAutoRoutingConn()) {
        // Do nothing
        return false;
    }

    SPCurve *curve = _path->original_curve ?_path->original_curve : _path->curve;

    recreateCurve( curve, _connRef, _connCurvature );

    Geom::Matrix doc2item = sp_item_i2doc_affine(SP_ITEM(_path)).inverse();
    curve->transform(doc2item);

    return true;
}

static void spdc_attach_selection(FreehandBase *dc, Inkscape::Selection */*sel*/)
{
    // We reset white and forget white/start/end anchors
    spdc_reset_white(dc);
    dc->sa = NULL;
    dc->ea = NULL;

    SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;

    if ( item && SP_IS_PATH(item) ) {
        // Create new white data
        // Item
        dc->white_item = item;

        // Curve list
        // We keep it in desktop coordinates to eliminate calculation errors
        SPCurve *norm = SP_PATH(item)->get_curve_for_edit();
        norm->transform((dc->white_item)->i2dt_affine());
        g_return_if_fail( norm != NULL );
        dc->white_curves = g_slist_reverse(norm->split());
        norm->unref();

        // Anchor list
        for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
            SPCurve *c;
            c = static_cast<SPCurve*>(l->data);
            g_return_if_fail( c->get_segment_count() > 0 );
            if ( !c->is_closed() ) {
                SPDrawAnchor *a;
                a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
                if (a)
                    dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
                a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
                if (a)
                    dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
            }
        }
        // fixme: recalculate active anchor?
    }
}

void
sp_selected_path_combine(SPDesktop *desktop)
{
    Inkscape::Selection *selection = sp_desktop_selection(desktop);
    SPDocument *doc = sp_desktop_document(desktop);
    
    if (g_slist_length((GSList *) selection->itemList()) < 1) {
        sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to combine."));
        return;
    }

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

    GSList *items = g_slist_copy((GSList *) selection->itemList());

    items = sp_degroup_list (items); // descend into any groups in selection

    GSList *to_paths = NULL;
    for (GSList *i = items; i != NULL; i = i->next) {
        SPItem *item = (SPItem *) i->data;
        if (!SP_IS_PATH(item) && !SP_IS_GROUP(item))
            to_paths = g_slist_prepend(to_paths, item);
    }
    GSList *converted = NULL;
    bool did = sp_item_list_to_curves(to_paths, &items, &converted);
    g_slist_free(to_paths);
    for (GSList *i = converted; i != NULL; i = i->next)
        items = g_slist_prepend(items, doc->getObjectByRepr((Inkscape::XML::Node*)(i->data)));

    items = sp_degroup_list (items); // converting to path may have added more groups, descend again

    items = g_slist_sort(items, (GCompareFunc) sp_item_repr_compare_position);
    items = g_slist_reverse(items);

    // remember the position, id, transform and style of the topmost path, they will be assigned to the combined one
    gint position = 0;
    char const *id = NULL;
    char const *transform = NULL;
    char const *style = NULL;
    char const *path_effect = NULL;

    SPCurve* curve = NULL;
    SPItem *first = NULL;
    Inkscape::XML::Node *parent = NULL; 

    if (did) {
        selection->clear();
    }

    for (GSList *i = items; i != NULL; i = i->next) {  // going from top to bottom

        SPItem *item = (SPItem *) i->data;
        if (!SP_IS_PATH(item)) {
            continue;
        }

        if (!did) {
            selection->clear();
            did = true;
        }

        SPCurve *c = SP_PATH(item)->get_curve_for_edit();
        if (first == NULL) {  // this is the topmost path
            first = item;
            parent = first->getRepr()->parent();
            position = first->getRepr()->position();
            id = first->getRepr()->attribute("id");
            transform = first->getRepr()->attribute("transform");
            // FIXME: merge styles of combined objects instead of using the first one's style
            style = first->getRepr()->attribute("style");
            path_effect = first->getRepr()->attribute("inkscape:path-effect");
            //c->transform(item->transform);
            curve = c;
        } else {
            c->transform(item->getRelativeTransform(first));
            curve->append(c, false);
            c->unref();

            // reduce position only if the same parent
            if (item->getRepr()->parent() == parent) {
                position--;
            }
            // delete the object for real, so that its clones can take appropriate action
            item->deleteObject();
        }
    }

    g_slist_free(items);

    if (did) {
        first->deleteObject(false);
        // delete the topmost.

        Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
        Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");

        // restore id, transform, path effect, and style
        repr->setAttribute("id", id);
//.........这里部分代码省略.........

// Create path for rendering shape on screen
void SPGenericEllipse::set_shape()
{
    // std::cout << "SPGenericEllipse::set_shape: Entrance" << std::endl;
    if (hasBrokenPathEffect()) {
        g_warning("The ellipse shape has unknown LPE on it! Convert to path to make it editable preserving the appearance; editing it as ellipse will remove the bad LPE");

        if (this->getRepr()->attribute("d")) {
            // unconditionally read the curve from d, if any, to preserve appearance
            Geom::PathVector pv = sp_svg_read_pathv(this->getRepr()->attribute("d"));
            SPCurve *cold = new SPCurve(pv);
            this->setCurveInsync(cold, TRUE);
            cold->unref();
        }

        return;
    }
    if (Geom::are_near(this->rx.computed, 0) || Geom::are_near(this->ry.computed, 0)) {
        return;
    }

    this->normalize();

    SPCurve *curve = NULL;

    // For simplicity, we use a circle with center (0, 0) and radius 1 for our calculations.
    Geom::Circle circle(0, 0, 1);

    if (!this->_isSlice()) {
        start = 0.0;
        end = 2.0*M_PI;
    }
    double incr = end - start; // arc angle
    if (incr < 0.0) incr += 2.0*M_PI;    

    int numsegs = 1 + int(incr*2.0/M_PI); // number of arc segments
    if (numsegs > 4) numsegs = 4;

    incr = incr/numsegs; // limit arc angle to less than 90 degrees
    Geom::Path path(Geom::Point::polar(start));
    Geom::EllipticalArc* arc;
    for (int seg = 0; seg < numsegs; seg++) {
        arc = circle.arc(Geom::Point::polar(start + seg*incr), Geom::Point::polar(start + (seg + 0.5)*incr), Geom::Point::polar(start + (seg + 1.0)*incr));
        path.append(*arc);
        delete arc;
    }
    Geom::PathBuilder pb;
    pb.append(path);
    if (this->_isSlice() && this->_closed) {
        pb.lineTo(Geom::Point(0, 0));
    }
    if (this->_closed) {
        pb.closePath();
    } else {
        pb.flush();
    }
    curve = new SPCurve(pb.peek());

    // gchar *str = sp_svg_write_path(curve->get_pathvector());
    // std::cout << "  path: " << str << std::endl;
    // g_free(str);

    // Stretching / moving the calculated shape to fit the actual dimensions.
    Geom::Affine aff = Geom::Scale(rx.computed, ry.computed) * Geom::Translate(cx.computed, cy.computed);
    curve->transform(aff);

    /* Reset the shape's curve to the "original_curve"
     * This is very important for LPEs to work properly! (the bbox might be recalculated depending on the curve in shape)*/
    this->setCurveInsync(curve, TRUE);
    this->setCurveBeforeLPE(curve);

    if (hasPathEffect() && pathEffectsEnabled()) {
        SPCurve *c_lpe = curve->copy();
        bool success = this->performPathEffect(c_lpe);

        if (success) {
            this->setCurveInsync(c_lpe, TRUE);
        }

        c_lpe->unref();
    }

    curve->unref();
    // std::cout << "SPGenericEllipse::set_shape: Exit" << std::endl;
}

void
sp_selected_path_combine(SPDesktop *desktop)
{
    Inkscape::Selection *selection = desktop->getSelection();
    SPDocument *doc = desktop->getDocument();

    std::vector<SPItem*> items(selection->itemList());
    
    if (items.size() < 1) {
        desktop->getMessageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to combine."));
        return;
    }

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

    items = sp_degroup_list (items); // descend into any groups in selection

    std::vector<SPItem*> to_paths;
    for (std::vector<SPItem*>::const_reverse_iterator i = items.rbegin(); i != items.rend(); ++i) {
        if (!dynamic_cast<SPPath *>(*i) && !dynamic_cast<SPGroup *>(*i)) {
            to_paths.push_back(*i);
        }
    }
    std::vector<Inkscape::XML::Node*> converted;
    bool did = sp_item_list_to_curves(to_paths, items, converted);
    for (std::vector<Inkscape::XML::Node*>::const_iterator i = converted.begin(); i != converted.end(); ++i)
        items.push_back((SPItem*)doc->getObjectByRepr(*i));

    items = sp_degroup_list (items); // converting to path may have added more groups, descend again

    sort(items.begin(),items.end(),less_than_items);
    assert(!items.empty()); // cannot be NULL because of list length check at top of function

    // remember the position, id, transform and style of the topmost path, they will be assigned to the combined one
    gint position = 0;
    char const *id = NULL;
    char const *transform = NULL;
    char const *style = NULL;
    char const *path_effect = NULL;

    SPCurve* curve = NULL;
    SPItem *first = NULL;
    Inkscape::XML::Node *parent = NULL; 

    if (did) {
        selection->clear();
    }

    for (std::vector<SPItem*>::const_reverse_iterator i = items.rbegin(); i != items.rend(); ++i){

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

        if (!did) {
            selection->clear();
            did = true;
        }

        SPCurve *c = path->get_curve_for_edit();
        if (first == NULL) {  // this is the topmost path
            first = item;
            parent = first->getRepr()->parent();
            position = first->getRepr()->position();
            id = first->getRepr()->attribute("id");
            transform = first->getRepr()->attribute("transform");
            // FIXME: merge styles of combined objects instead of using the first one's style
            style = first->getRepr()->attribute("style");
            path_effect = first->getRepr()->attribute("inkscape:path-effect");
            //c->transform(item->transform);
            curve = c;
        } else {
            c->transform(item->getRelativeTransform(first));
            curve->append(c, false);
            c->unref();

            // reduce position only if the same parent
            if (item->getRepr()->parent() == parent) {
                position--;
            }
            // delete the object for real, so that its clones can take appropriate action
            item->deleteObject();
        }
    }


    if (did) {
        first->deleteObject(false);
        // delete the topmost.

        Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
        Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");

        // restore id, transform, path effect, and style
        repr->setAttribute("id", id);
        if (transform) {
//.........这里部分代码省略.........

static void spdc_flush_white(FreehandBase *dc, SPCurve *gc)
{
    SPCurve *c;
    if (dc->white_curves) {
        g_assert(dc->white_item);
        c = SPCurve::concat(dc->white_curves);
        g_slist_free(dc->white_curves);
        dc->white_curves = NULL;
        if (gc) {
            c->append(gc, FALSE);
        }
    } else if (gc) {
        c = gc;
        c->ref();
    } else {
        return;
    }

    // Now we have to go back to item coordinates at last
    c->transform( dc->white_item
                            ? (dc->white_item)->dt2i_affine()
                            : dc->desktop->dt2doc() );

    SPDesktop *desktop = dc->desktop;
    SPDocument *doc = desktop->getDocument();
    Inkscape::XML::Document *xml_doc = doc->getReprDoc();

    if ( c && !c->is_empty() ) {
        // We actually have something to write

        bool has_lpe = false;
        Inkscape::XML::Node *repr;

        if (dc->white_item) {
            repr = dc->white_item->getRepr();
            has_lpe = SP_LPE_ITEM(dc->white_item)->hasPathEffectRecursive();
        } else {
            repr = xml_doc->createElement("svg:path");
            // Set style
            sp_desktop_apply_style_tool(desktop, repr, tool_name(dc).data(), false);
        }

        gchar *str = sp_svg_write_path( c->get_pathvector() );
        g_assert( str != NULL );
        if (has_lpe)
            repr->setAttribute("inkscape:original-d", str);
        else
            repr->setAttribute("d", str);
        g_free(str);

        if (!dc->white_item) {
            // Attach repr
            SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));

            spdc_check_for_and_apply_waiting_LPE(dc, item, c);
            if(previous_shape_type != BEND_CLIPBOARD){
                dc->selection->set(repr);
            }
            Inkscape::GC::release(repr);
            item->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
            item->updateRepr();
            item->doWriteTransform(item->getRepr(), item->transform, NULL, true);
            if(previous_shape_type == BEND_CLIPBOARD){
                repr->parent()->removeChild(repr);
            }
        }

        DocumentUndo::done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
                         _("Draw path"));

        // When quickly drawing several subpaths with Shift, the next subpath may be finished and
        // flushed before the selection_modified signal is fired by the previous change, which
        // results in the tool losing all of the selected path's curve except that last subpath. To
        // fix this, we force the selection_modified callback now, to make sure the tool's curve is
        // in sync immediately.
        spdc_selection_modified(desktop->getSelection(), 0, dc);
    }

    c->unref();

    // Flush pending updates
    doc->ensureUpToDate();
}