static bool
ParseAngle(const TCHAR *&src, Angle &angle)
{
  // 41.234234N

  TCHAR *endptr;

  // Parse numerical value
  double value = _tcstod(src, &endptr);
  if (endptr == src)
    return false;

  src = endptr;
  angle = Angle::Degrees(value);

  // Skip until next whitespace and look for NSEW signs
  bool found = false;
  while (*src != _T(' ') && *src != _T('\0')) {
    if (!found) {
      if (*src == _T('N') || *src == _T('n') ||
          *src == _T('E') || *src == _T('e')) {
        found = true;
      } else if (*src == _T('S') || *src == _T('s') ||
                 *src == _T('W') || *src == _T('w')) {
        found = true;
        angle.Flip();
      }
    }

    src++;
  }

  return found;
}
Example #2
0
Angle
SunEphemeris::GetHourAngle(Angle lat, Angle declin)
{
  Angle dfo = Angle::Degrees(SUN_DIAMETER / 2 + AIR_REFRACTION);

  // Correction: different sign at southern hemisphere
  if (negative(lat.Degrees()))
    dfo.Flip();

  fixed fo = (declin + dfo).tan() * lat.tan();
  return Angle::asin(fo) + Angle::QuarterCircle();
}
Example #3
0
static bool
ReadLongitude(NMEAInputLine &line, Angle &value_r)
{
  Angle value;
  if (!ReadPositiveAngle(line, value))
    return false;

  if (line.read_first_char() == 'W')
    value.Flip();

  value_r = value;
  return true;
}
Example #4
0
static bool
ReadLongitude(NMEAInputLine &line, Angle &value_r)
{
    Angle value;
    if (!ReadGeoAngle(line, value))
        return false;

    char ch = line.ReadOneChar();
    if (ch == 'W')
        value.Flip();
    else if (ch != 'E')
        return false;

    value_r = value;
    return true;
}