qt 度分秒和点度转换

度分秒和点度互转

QString 字符串截取

 1 QString degree2Dmc(double dbDegree)
 2 {
 3     double lon = dbDegree;
 4     if (lon < 0.0)
 5         lon = -dbDegree;
 6     int nDegree = (int)lon;
 7     double dbMin = (lon - nDegree) * 60.0;
 8     int nMin = dbMin;
 9     double sec = (dbMin - (int)dbMin) * 60.0;
10 
11     if (dbDegree < 0.0)
12     {
13         nDegree = -nDegree;
14     }
15         
16     QString textLon = QString(tr("%1%2%3\'%4\"")).arg(nDegree).arg('\xb0').arg(nMin).arg(sec, 0, 'f', 2);
17     return textLon;
18 }
19 
20 double Dmc2Degree(QString strDmc)
21 {
22     QString strTemp = strDmc;
23     
24     QString strSec = "";
25     QString strMin = "";
26     QString strDegree = "";
27 
28     int nDegree = strTemp.indexOf("°");
29     if (nDegree != -1)
30     {
31         strDegree = strTemp.left(nDegree);
32         strTemp = strTemp.mid(nDegree + 1);
33     }
34 
35     int nMin = strTemp.indexOf('\'');
36     if (nMin != -1)
37     {
38         strMin = strTemp.left(nMin);
39         strTemp = strTemp.mid(nMin + 1);
40     }
41 
42     int nSec = strTemp.indexOf('\"');
43     if (nSec != -1)
44     {
45         strSec = strTemp.left(nSec);
46     }
47 
48     double dbDegree = strDegree.toDouble();
49     double dbMin = strMin.toDouble();
50     double dbSec = strSec.toDouble();
51 
52     double dbRet;
53     if (dbDegree < 0.0)
54     {
55         dbDegree = -dbDegree;
56         dbRet = -(dbDegree + dbMin / 60.0 + dbSec / 3600.0);
57     }
58     else
59     {
60         dbRet = dbDegree + dbMin / 60.0 + dbSec / 3600.0;
61     }
62 
63     return dbRet;
64 }