完善代码中的红线指针随鼠标移动而移动，黄线指针在鼠标点击时发生移动的代码

以下是完善后的代码，可以实现红线指针随鼠标移动而移动，黄线指针在鼠标点击时发生移动，并且可以计算出两个指针之间的夹角，并在UI界面上显示角度。

#include <QtWidgets>

class CircleWidget : public QWidget
{
public:
    CircleWidget(QWidget *parent = nullptr)
        : QWidget(parent)
    {
        m_angleRed = 0;
        m_angleYellow = 0;
    }

    void setAngleRed(qreal angle)
    {
        m_angleRed = angle;
        update();
    }

    void setAngleYellow(qreal angle)
    {
        m_angleYellow = angle;
        update();
    }

    qreal angle() const
    {
        return m_angleRed - m_angleYellow;
    }

protected:
    void paintEvent(QPaintEvent *event) override
    {
        Q_UNUSED(event);

        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);

        // 绘制圆形图
        painter.setPen(Qt::black);
        painter.drawEllipse(rect().adjusted(10, 10, -10, -10));

        // 绘制刻度线
        painter.save();
        painter.translate(rect().center());
        painter.rotate(-45);

        for (int i = 0; i < 12; ++i) {
            painter.drawLine(0, -100, 0, -90);
            painter.rotate(30);
        }

        painter.restore();

        // 绘制指针
        painter.save();
        painter.translate(rect().center());

        // 红色指针
        painter.rotate(m_angleRed);
        painter.setPen(Qt::red);
        painter.drawLine(0, 0, 0, -60);

        // 黄色指针
        painter.rotate(m_angleYellow - m_angleRed);
        painter.setPen(Qt::yellow);
        painter.drawLine(0, 0, 0, -80);

        painter.restore();
    }

private:
    qreal m_angleRed;
    qreal m_angleYellow;
};

class MainWindow : public QMainWindow
{
public:
    MainWindow(QWidget *parent = nullptr)
        : QMainWindow(parent)
    {
        m_circleWidget = new CircleWidget(this);
        setCentralWidget(m_circleWidget);

        connect(m_circleWidget, &CircleWidget::mousePressEvent, this, &MainWindow::onMousePress);
        connect(m_circleWidget, &CircleWidget::mouseMoveEvent, this, &MainWindow::onMouseMove);

        m_label = new QLabel(this);
        statusBar()->addWidget(m_label);
    }

private:
    void onMousePress(QMouseEvent *event)
    {
        m_lastPoint = event->pos();

        QPoint center = m_circleWidget->rect().center();
        qreal dx = m_lastPoint.x() - center.x();
        qreal dy = m_lastPoint.y() - center.y();
        m_angleYellow = qAtan2(dy, dx) * 180 / M_PI;
        m_circleWidget->setAngleYellow(m_angleYellow);
    }

    void onMouseMove(QMouseEvent *event)
    {
        QPoint currentPoint = event->pos();
        QPoint center = m_circleWidget->rect().center();

        qreal dx1 = m_lastPoint.x() - center.x();
        qreal dy1 = m_lastPoint.y() - center.y();
        qreal dx2 = currentPoint.x() - center.x();
        qreal dy2 = currentPoint.y() - center.y();

        qreal angle1 = qAtan2(dy1, dx1) * 180 / M_PI;
        qreal angle2 = qAtan2(dy2, dx2) * 180 / M_PI;

        qreal deltaAngle = angle2 - angle1;
        if (deltaAngle < -180) {
            deltaAngle += 360;
        } else if (deltaAngle > 180) {
            deltaAngle -= 360;
        }

        m_angleRed += deltaAngle;
        m_circleWidget->setAngleRed(m_angleRed);

        m_lastPoint = currentPoint;

        m_label->setText(QString("Angle: %1 degrees").arg(m_circleWidget->angle()));
    }

    QPoint m_lastPoint;
    qreal m_angleYellow;
    qreal m_angleRed;
    CircleWidget *m_circleWidget;
    QLabel *m_label;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MainWindow w;
    w.show();

    return a.exec();
}

注意：这个代码只是一个示例，可能需要根据实际需求进行修改和完善。