qt实现二维光谱图像显示

下面是一个简单的QT程序，实现了二维光谱图像的加载、显示和交互功能：

#include <QtWidgets>
#include <QImage>
#include <QPainter>

class SpectrumWidget : public QWidget
{
public:
    SpectrumWidget(QWidget *parent = nullptr)
        : QWidget(parent)
    {
        // 加载二维光谱图像
        m_spectrumImage.load(":/images/spectrum.png");

        // 设置窗口大小
        setFixedSize(m_spectrumImage.size());

        // 初始化缩放参数
        m_scaleFactor = 1.0;
        m_offset = QPoint(0, 0);
    }

protected:
    void paintEvent(QPaintEvent *event) override
    {
        QPainter painter(this);

        // 缩放和平移图像
        QImage scaledImage = m_spectrumImage.scaled(m_scaleFactor * m_spectrumImage.size());
        QRectF targetRect = QRectF(m_offset, scaledImage.size());
        painter.drawImage(targetRect, scaledImage);

        // 绘制十字光标
        painter.setPen(Qt::red);
        painter.drawLine(QPointF(0, m_cursorPos.y()), QPointF(width(), m_cursorPos.y()));
        painter.drawLine(QPointF(m_cursorPos.x(), 0), QPointF(m_cursorPos.x(), height()));
    }

    void mousePressEvent(QMouseEvent *event) override
    {
        m_lastPos = event->pos();
    }

    void mouseMoveEvent(QMouseEvent *event) override
    {
        QPoint delta = event->pos() - m_lastPos;
        m_lastPos = event->pos();

        // 移动图像
        if (event->buttons() & Qt::LeftButton) {
            m_offset += delta;
            update();
        }

        // 设置十字光标位置
        m_cursorPos = (event->pos() - m_offset) / m_scaleFactor;
        update();
    }

    void wheelEvent(QWheelEvent *event) override
    {
        // 缩放图像
        double scaleFactor = (event->angleDelta().y() > 0 ? 1.1 : 0.9);
        m_scaleFactor *= scaleFactor;

        // 限制缩放范围
        m_scaleFactor = qMax(0.1, qMin(m_scaleFactor, 10.0));

        // 调整偏移量，使缩放中心不变
        m_offset = (m_offset - event->pos()) * scaleFactor + event->pos();

        update();
    }

private:
    QImage m_spectrumImage;
    double m_scaleFactor;
    QPoint m_offset;
    QPoint m_cursorPos;
    QPoint m_lastPos;
};

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

    SpectrumWidget widget;
    widget.show();

    return app.exec();
}

程序中使用QImage类加载二维光谱图像，并在绘制事件中使用QPainter类对图像进行缩放和平移操作，以及绘制十字光标。在鼠标事件中，实现了图像的拖拽和缩放功能，同时设置了一个十字光标，用于指示鼠标当前位置的光谱强度值。