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C++ Relation::accept方法代码示例

本文整理汇总了C++中Relation::accept方法的典型用法代码示例。如果您正苦于以下问题:C++ Relation::accept方法的具体用法?C++ Relation::accept怎么用?C++ Relation::accept使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在Relation的用法示例。


在下文中一共展示了Relation::accept方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: visitRelation

void ElementGeometryClipper::visitRelation(const Relation& relation)
{
    struct RelationVisitor : public ElementVisitor
    {
        RelationVisitor(const BoundingBox& quadKeyBbox, ClipperLib::Clipper& clipper) :
                bbox_(quadKeyBbox), clipper_(clipper) { }

        void visitNode(const Node& node) 
        {
            // TODO
        }

        void visitWay(const Way& way)
        {
            ClipperLib::Path wayShape;
            setPath(bbox_, way, wayShape);
            clipper_.AddPath(wayShape, ClipperLib::ptSubject, false);
        }

        void visitArea(const Area& area)
        {
            ClipperLib::Path areaShape;
            setPath(bbox_, area, areaShape);
            clipper_.AddPath(areaShape, ClipperLib::ptSubject, true);
        }

        void visitRelation(const Relation& relation)
        {
            for (const auto& element : relation.elements) {
                element->accept(*this);
            }
        }

    private:
        const BoundingBox& bbox_;
        ClipperLib::Clipper& clipper_;

    } visitor(quadKeyBbox_, clipper_);

    relation.accept(visitor);

    // Process results
    ClipperLib::PolyTree solution;
    clipper_.AddPath(createPathFromBoundingBox(), ClipperLib::ptClip, true);
    clipper_.Execute(ClipperLib::ctIntersection, solution);
    clipper_.Clear();

    std::size_t count = static_cast<size_t>(solution.Total());
    // Do not store one result as relation
    if (count == 1) {
        ClipperLib::PolyNode* node = solution.GetFirst();
        if (node->IsOpen()) {
            Way way;
            setData(way, relation, node->Contour);
            callback_(way, quadKey_);
        }
        else {
            if (!node->IsHole()) {
                Area area;
                setData(area, relation, node->Contour);
                callback_(area, quadKey_);
            }
        }
    }
    else if (count > 1) {
        Relation newRelation;
        newRelation.id = relation.id;
        newRelation.tags = relation.tags;
        newRelation.elements.reserve(count);

        ClipperLib::PolyNode* polyNode = solution.GetFirst();
        while (polyNode) {
            if (polyNode->IsOpen()) {
                auto way = std::make_shared<Way>();
                setCoordinates(*way, polyNode->Contour);
                newRelation.elements.push_back(way);
            }
            else {
                auto area = std::make_shared<Area>();
                setCoordinates(*area, polyNode->Contour);
                newRelation.elements.push_back(area);
            }
            polyNode = polyNode->GetNext();
        }
        callback_(newRelation, quadKey_);
    }
}
开发者ID:realwindz,项目名称:utymap,代码行数:87,代码来源:ElementGeometryClipper.cpp


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