绘制像素以在Qt中创建移动效果

#include <QtWidgets>

class PixelWidget : public QWidget {
public:
    PixelWidget(QWidget *parent = nullptr) : QWidget(parent) {
        setFixedSize(400, 300);
        startTimer(100); // 设置定时器，每100毫秒触发一次timerEvent()
    }

protected:
    void paintEvent(QPaintEvent *event) override {
        QPainter painter(this);
        painter.setPen(Qt::black);

        // 绘制像素点
        for (const QPoint &point : points) {
            painter.drawPoint(point);
        }
    }

    void timerEvent(QTimerEvent *event) override {
        // 移动像素点
        for (QPoint &point : points) {
            point += QPoint(1, 1);
        }

        update(); // 更新窗口，触发paintEvent()重新绘制
    }

private:
    QVector<QPoint> points{{100, 100}, {200, 200}, {300, 300}};
};

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

    PixelWidget widget;
    widget.show();

    return app.exec();
}