Method Render

core/graphics/guide/RefLine.cpp:20–239

using namespace xg;

void guide::RefLine::Render(XChart &chart, shape::Group *container, canvas::CanvasContext &context, const std::vector<util::Rect> &dangerRects) {
    const std::string &xField = chart.GetXScaleField();
    std::vector<std::string> yFields = chart.getYScaleFields();
    const std::string yField = yFields[0];
    
    
    for (auto it = chart.GetGeoms().begin(); it != chart.GetGeoms().end(); ++it) {
        auto &dataArray = (*it)->GetDataArray();
        long dataArraySize = dataArray.size();
        const std::string &geomType = (*it)->GetType();
        const Group *group = (*it)->GetContainer();
        if (group == nullptr) {
            continue;
        }
        
        long dataRatio = group->children_.size() / dataArraySize;
        if (dataRatio == 0) {
            return;
        }
        
        for (int index = 0; index < group->children_.size(); index++) {
            auto &rect = group->children_[index];
            
            bool shouldDrawRefLine = false;
            std:string content = "";
            float textSize = 30.f;
            const std::string &contentKey = "content";
            const std::string &textColorKey = "textColor";
            const std::string &textSizeKey = "textSize";
            canvas::CanvasFillStrokeStyle refColorStyle = CanvasFillStrokeStyle("#000000");
    
            if (this->config_.contains("refLines") && this->config_["refLines"].is_array()) {
                for(const auto &oneRefLine : this->config_["refLines"]) {
                    std::string key = oneRefLine.contains("recordIndex") ? "recordIndex" : "dataArrayIndex";
                    if(json::GetIntNumber(oneRefLine, key, -1) == index / dataRatio) {
                        //dataArrayIndex与data的index匹配，开始校验数据是否valid
                        //标题
                        if (oneRefLine.contains(contentKey) && oneRefLine[contentKey].is_string()) {
                            content = oneRefLine[contentKey];
                        }
                        //字颜色
                        if (oneRefLine.contains(textColorKey) && oneRefLine[textColorKey].is_string()) {
                            refColorStyle = CanvasFillStrokeStyle(oneRefLine[textColorKey]);
                        }
                        //字大小
                        if (oneRefLine.contains(textSizeKey) && oneRefLine[textSizeKey].is_number()) {
                            textSize = oneRefLine[textSizeKey].get<float>();
                        }
                        shouldDrawRefLine = true;
                    }
                }
            }
            
            if (!shouldDrawRefLine) {
                continue;
            }

            double r0 = 0.f;