QCustomPlot保存图片

#include 
#include 
#include  "qcustomplot.h"
#include 
#include 
#include 

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

    // 创建 QCustomPlot 对象并绘制图形
    QCustomPlot customPlot;
    customPlot.addGraph();
    QVector xData = {1, 2, 3, 4, 5};
    QVector yData = {1, 4, 9, 16, 25};
    customPlot.graph(0)->setData(xData, yData);
    customPlot.rescaleAxes();
    customPlot.replot();

    // 创建 QPixmap 对象并将 QCustomPlot 渲染到 QPixmap 上
    QPixmap pixmap(customPlot.size());
    customPlot.render(&pixmap);

    // 创建 QByteArray 对象并将 QPixmap 写入 QByteArray 中
    QByteArray byteArray;
    QBuffer buffer(&byteArray);
    buffer.open(QIODevice::WriteOnly);
    pixmap.save(&buffer, "PNG"); // 可以选择其他图像格式，如 "JPG" 或 "BMP"
    buffer.close();

    qDebug() << "Image saved to QByteArray.";

    return a.exec();
}

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