给出一个信号，通过16QAM的调制方式，基于qt画出星座图

以下是一个基于Qt的16QAM星座图绘制示例代码：

#include <QApplication>
#include <QWidget>
#include <QPainter>

class StarMapWidget : public QWidget
{
public:
    StarMapWidget(QWidget *parent = nullptr) : QWidget(parent) {}

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

        // 绘制坐标轴
        painter.drawLine(width() / 2, 0, width() / 2, height());
        painter.drawLine(0, height() / 2, width(), height() / 2);

        // 绘制星座点
        const int pointSize = 8;
        const int pointSpacing = 20;
        const int pointRadius = pointSize / 2;
        const int xOffset = width() / 2 - pointSpacing * 2;
        const int yOffset = height() / 2 - pointSpacing * 2;
        const int pointsPerRow = 4;
        const int totalPoints = 16;
        const int pointValues[totalPoints][2] = {
            {3, 3}, {3, 1}, {1, 3}, {1, 1},
            {3, -3}, {3, -1}, {1, -3}, {1, -1},
            {-3, 3}, {-3, 1}, {-1, 3}, {-1, 1},
            {-3, -3}, {-3, -1}, {-1, -3}, {-1, -1}
        };

        for (int i = 0; i < totalPoints; i++) {
            const int row = i / pointsPerRow;
            const int col = i % pointsPerRow;
            const int x = xOffset + col * pointSpacing;
            const int y = yOffset + row * pointSpacing;
            const int valueX = pointValues[i][0];
            const int valueY = pointValues[i][1];

            painter.drawEllipse(QPoint(x, y), pointRadius, pointRadius);
            painter.drawText(QRect(x - pointRadius, y - pointRadius, pointSize, pointSize),
                             QString("%1%2").arg(valueX).arg(valueY),
                             QTextOption(Qt::AlignHCenter | Qt::AlignVCenter));
        }
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    StarMapWidget widget;
    widget.resize(300, 300);
    widget.show();
    return app.exec();
}

这个例子绘制了一个16QAM星座图，每个点的值以文本的形式显示在点周围。你可以根据自己的需求调整点的大小、间距、颜色等属性。