QT绘图螺旋形

#include <QtWidgets>

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

protected:
    void paintEvent(QPaintEvent *event) override
    {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing, true);
        painter.translate(width() / 2, height() / 2); // 将原点移动到窗口中心

        // 绘制螺旋线
        painter.setPen(Qt::black);
        const int numPoints = 1000;
        const qreal step = 0.1;
        qreal angle = 0;
        qreal radius = 0;
        QPoint prevPoint;

        for (int i = 0; i < numPoints; ++i)