GPS坐标 转 火星坐标

#import 

#define DBNAME @"gps.db"
//转换gps坐标为火星坐标
-(CLLocationCoordinate2D)zzTransGPS:(CLLocationCoordinate2D)yGps
{

    NSString *database_path = [[NSHomeDirectory() stringByAppendingString:@"/Documents/"] stringByAppendingString:DBNAME];
    
    if (sqlite3_open(database_path.UTF8String, &db) != SQLITE_OK) {
        sqlite3_close(db);
        NSLog(@"Open gps data failed!");
    }

    int TenLat=0;
    int TenLog=0;
    TenLat = (int)(yGps.latitude*10);
    TenLog = (int)(yGps.longitude*10);
    NSString *sql = [[NSString alloc]initWithFormat:@"select offLat,offLog from gpsT where lat=%d and log = %d",TenLat,TenLog];
    NSLog(@"SQL command:%@", sql);
    const char * sqlc= [sql UTF8String];
    
    sqlite3_stmt* stmtL ;
    if (sqlite3_prepare_v2(db, sqlc, -1, &stmtL, nil) != SQLITE_OK)
    {
        NSLog(@"SQl prepare failed %s",sqlite3_errmsg(db));
    }
    
    int offLat=0;
    int offLog=0;
    while (sqlite3_step(stmtL)==SQLITE_ROW)
    {
        offLat = sqlite3_column_int(stmtL, 0);
        offLog = sqlite3_column_int(stmtL, 1);
        
    }
    
    yGps.latitude = yGps.latitude+offLat*0.0001;
    yGps.longitude = yGps.longitude + offLog*0.0001;
    return yGps;
}