Method Render

core/graphics/XChart.cpp:487–562

}

bool XChart::Render() {
    this->logTracer_->trace("#Render %s", "start render");
    if(canvasContext_ == nullptr) {
        this->logTracer_->trace("error: %s", "canvasContext is nullptr, render end.");
        return false;
    }

    if(!canvasContext_->IsValid()) {
        this->logTracer_->trace("error: %s", "canvasContext is not valid, render end.");
        return false;
    }

    if(!this->data_.is_array() || this->data_.size() == 0) {
        this->logTracer_->trace("error: %s", "data is not array or size is zero, render end.");
        return false;
    }

    auto startTimeStamp = xg::CurrentTimestampAtMM();

    if(!rendered_) {
        // 1. init Coord
        this->logTracer_->trace("%s padding: [%lf, %lf, %lf, %lf]", "call InitCoord", padding_[0], padding_[1], padding_[2], padding_[3]);
        this->InitCoord();
        // 2. init Geoms

        this->logTracer_->trace("%s", "foreach geom init");
        std::for_each(geoms_.begin(), geoms_.end(), [this](auto &geom) -> void { geom->Init(this); });
        rendered_ = true;

        this->NotifyAction(ACTION_CHART_AFTER_INIT);
    }
    // 3. legend render
    this->logTracer_->trace("%s", "legendController render");
    legendController_->Render(*this);

    // 4. render Axis
    this->logTracer_->trace("%s", "draw axies");
    axisController_->DrawAxes(this, *canvasContext_);

    // 5. geom paint
    this->logTracer_->trace("%s", "foreach geom paint");

    std::for_each(geoms_.begin(), geoms_.end(), [this](auto &geom) { geom->Paint(this); });
    // 6. guide render
    this->NotifyAction(ACTION_CHART_AFTER_GEOM_DRAW);

    // 6.1 guide render
    this->logTracer_->trace("%s", "guideController render");
    guideController_->Render(*this, *canvasContext_);

    // 7. children sort
    this->logTracer_->trace("%s", "canvas#sort");
    this->canvas_->Sort();

    // 图元元素限定在屏幕区域内绘制。当绘制元素很多时(K线)，这个操作耗时太大，先不执行这个操作。
    //     midLayout_->clip_ = std::make_unique<shape::Rect>(util::Point{coord_->GetXAxis().x, coord_->GetYAxis().y},
    //                                                       util::Size{coord_->GetWidth(), coord_->GetHeight()});
    //     util::Matrix  matrix = {0.029800, 0.000000, 0.000000, 1.000000, 104.251022, 0.000000};