// 传统ImGui代码即时模式代码,这段带码每次刷新帧都要执行一遍
if (ImGui::Begin("Window")) {
    if (ImPlot::BeginPlot("Plot")) {
        ImPlot::PlotLine(...);
        ImPlot::EndPlot();
    }
    ImGui::End();
}

// QIm方式 - 面向对象，更符合Qt习惯
auto window = new QImWindowNode(root);
window->setTitle("Window");

auto plot = new QImPlotNode(window);  // 自动成为子节点
plot->setTitle("Plot");

auto line = new QImPlotLineNode(plot);
line->setData(...);

#include <QImFigureWidget.h>

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget* parent = nullptr) : QMainWindow(parent) {
        // 创建绘图窗口
        QIM::QImFigureWidget* figure = new QIM::QImFigureWidget(this);
        setCentralWidget(figure);
        
        // 配置2行1列的子图
        figure->setSubplotGrid(2, 1);
        
        // 创建第一个子图
        QIM::QImPlotNode* plot1 = figure->createPlotNode();
        plot1->x1Axis()->setLabel("时间 (s)");
        plot1->y1Axis()->setLabel("幅度");
        
        // 添加数据
        QVector<double> x = {0, 1, 2, 3, 4};
        QVector<double> y = {0, 1, 4, 9, 16};
        plot1->addLine(x, y, "二次曲线");
        
        // 第二个子图
        QIM::QImPlotNode* plot2 = figure->createPlotNode();
        plot2->setLegendEnabled(true);
        
        // 添加多条曲线
        std::vector<double> x2 = {0, 1, 2, 3, 4};
        std::vector<double> sin_y, cos_y;
        for (double val : x2) {
            sin_y.push_back(std::sin(val));
            cos_y.push_back(std::cos(val));
        }
        plot2->addLine(x2, sin_y, "sin(x)");
        plot2->addLine(x2, cos_y, "cos(x)");
    }
};

QImWidget* widget = new QImWidget();
widget->setRenderMode(QImWidget::RenderAdaptive);  // 默认：智能自适应

// 三种模式：
// 1. RenderAdaptive: 交互时高帧率(18FPS)，静止时低帧率(1FPS)
// 2. RenderContinuous: 持续渲染(18FPS)，适合动画
// 3. RenderOnDemand: 仅在事件触发时渲染，最节能

class CustomPlotNode : public QImAbstractNode {
    Q_OBJECT
public:
    CustomPlotNode(QObject* parent = nullptr) : QImAbstractNode(parent) {}
    
protected:
    bool beginDraw() override {
        // 对应 ImGui::Begin("MyCustomWindow")
        return ImGui::Begin("MyCustomWindow", nullptr, m_flags);
    }
    
    void endDraw() override {
        ImGui::End();
    }
    
private:
    ImGuiWindowFlags m_flags = 0;
};