qt代码实现计算两个经纬度之间的距离，精确到米

以下是一份实现计算两个经纬度之间距离的Qt代码，精确到米：

#include <QtCore>
#include <QtMath>

const double EARTH_RADIUS = 6371000.0;

double degreesToRadians(double degrees) {
    return degrees * M_PI / 180.0;
}

double calculateDistance(double lat1, double lon1, double lat2, double lon2) {
    double deltaLat = degreesToRadians(lat2 - lat1);
    double deltaLon = degreesToRadians(lon2 - lon1);
    double a = qPow(qSin(deltaLat / 2.0), 2.0) + qCos(degreesToRadians(lat1)) * qCos(degreesToRadians(lat2)) * qPow(qSin(deltaLon / 2.0), 2.0);
    double c = 2.0 * qAtan2(qSqrt(a), qSqrt(1.0 - a));
    return EARTH_RADIUS * c;
}

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

    double lat1 = 34.264;
    double lon1 = -118.535;
    double lat2 = 33.942;
    double lon2 = -118.408;

    double distance = calculateDistance(lat1, lon1, lat2, lon2);

    qDebug() << "Distance between the two points is" << distance << "meters.";

    return app.exec();
}

这份代码中，我们使用了 `degreesToRadians()` 函数将角度转换为弧度，在 `calculateDistance()` 函数中使用了 Haversine 公式进行计算。最后，我们输出两个点之间的距离，单位为米。