qt 度分秒和点度转换

度分秒和点度互转

QString 字符串截取

QString degree2Dmc(double dbDegree)
{
    double lon = dbDegree;
    if (lon < 0.0)
        lon = -dbDegree;
    int nDegree = (int)lon;
    double dbMin = (lon - nDegree) * 60.0;
    int nMin = dbMin;
    double sec = (dbMin - (int)dbMin) * 60.0;

    if (dbDegree < 0.0)
    {
        nDegree = -nDegree;
    }
        
    QString textLon = QString(tr("%1%2%3\'%4\"")).arg(nDegree).arg('\xb0').arg(nMin).arg(sec, 0, 'f', 2);
    return textLon;
}

double Dmc2Degree(QString strDmc)
{
    QString strTemp = strDmc;
    
    QString strSec = "";
    QString strMin = "";
    QString strDegree = "";

    int nDegree = strTemp.indexOf("°");
    if (nDegree != -1)
    {
        strDegree = strTemp.left(nDegree);
        strTemp = strTemp.mid(nDegree + 1);
    }

    int nMin = strTemp.indexOf('\'');
    if (nMin != -1)
    {
        strMin = strTemp.left(nMin);
        strTemp = strTemp.mid(nMin + 1);
    }

    int nSec = strTemp.indexOf('\"');
    if (nSec != -1)
    {
        strSec = strTemp.left(nSec);
    }

    double dbDegree = strDegree.toDouble();
    double dbMin = strMin.toDouble();
    double dbSec = strSec.toDouble();

    double dbRet;
    if (dbDegree < 0.0)
    {
        dbDegree = -dbDegree;
        dbRet = -(dbDegree + dbMin / 60.0 + dbSec / 3600.0);
    }
    else
    {
        dbRet = dbDegree + dbMin / 60.0 + dbSec / 3600.0;
    }

    return dbRet;
}