Sup,
i'm not sure but ...
/**
* Gets the radian-angle to another Target on the Globe.
* @param target - pointer to other target
* @return, distance in radians
*/
double Target::getDistance(const Target* const target) const
{
const double lonTarget (target->getLongitude());
const double latTarget (target->getLatitude());
if (AreSameTwo(
_lon, lonTarget,
_lat, latTarget))
{
return 0.;
}
// else the formula below returns NaN <-----
return std::acos(
std::cos(_lat)
* std::cos(latTarget)
* std::cos(lonTarget - _lon)
+ std::sin(_lat)
* std::sin(latTarget));
}
might be worth a shot,
EDIT: I ended up writing this and sprinkling it around in various places (not necessarily the predict-destination routines exclusively)
/**
* Checks if val1 or val2 (lon,lat) is NaN or Inf.
* @note Checks validity of Globe coordinates.
* @param val1 - x-coordinate
* @param val2 - y-coordinate
* @return, true if either val1 or val2 is NaN or Inf
*/
template<class _Tx>
inline bool isNaNorInf(
const _Tx& val1,
const _Tx& val2)
{
if ( std::isnan(val1) || std::isnan(val2)
|| std::isinf(val1) || std::isinf(val2))
{
return true;
}
return false;
}
