fixed
AirspaceAircraftPerformance::SolutionGeneral(fixed distance, fixed dh) const
{
const fixed t_cruise =
positive(distance) ? distance / GetCruiseSpeed() : fixed(0);
const fixed h_descent = dh - t_cruise * GetCruiseDescent();
if (fabs(h_descent) < fixed(1))
return t_cruise;
if (positive(h_descent)) {
// descend steeper than best glide
fixed mod_descent_rate = GetDescentRate() + vertical_tolerance;
if (!positive(mod_descent_rate))
return fixed_big;
const fixed t_descent = h_descent / mod_descent_rate;
return std::max(t_cruise, t_descent);
}
// require climb
fixed mod_climb_rate = GetClimbRate() + vertical_tolerance;
if (!positive(mod_climb_rate))
return fixed_big;
const fixed t_climb = -h_descent / mod_climb_rate;
return t_cruise + t_climb;
}
double
AirspaceAircraftPerformance::SolutionGeneral(double distance, double dh) const
{
const auto t_cruise = distance > 0
? distance / GetCruiseSpeed()
: double(0);
const auto h_descent = dh - t_cruise * GetCruiseDescent();
if (fabs(h_descent) < 1)
return t_cruise;
if (h_descent > 0) {
// descend steeper than best glide
auto mod_descent_rate = GetDescentRate() + vertical_tolerance;
if (mod_descent_rate <= 0)
return BIG;
const auto t_descent = h_descent / mod_descent_rate;
return std::max(t_cruise, t_descent);
}
// require climb
auto mod_climb_rate = GetClimbRate() + vertical_tolerance;
if (mod_climb_rate <= 0)
return BIG;
const auto t_climb = -h_descent / mod_climb_rate;
return t_cruise + t_climb;
}
bool
AirspaceAircraftPerformance::SolutionExists(double distance_max,
double altitude,
double h_min, double h_max) const
{
if (altitude - h_max > 0 &&
std::max(GetCruiseDescent(), GetDescentRate()) + vertical_tolerance <= 0)
return false;
if (h_min-altitude > 0 &&
std::max(GetClimbRate(), -GetCruiseDescent()) + vertical_tolerance <= 0)
return false;
if (distance_max > 0 && GetCruiseSpeed() <= 0)
return false;
return true;
}
bool
AirspaceAircraftPerformance::SolutionExists(fixed distance_max,
fixed altitude,
fixed h_min, fixed h_max) const
{
if (positive(altitude - h_max) &&
!positive(std::max(GetCruiseDescent(), GetDescentRate())
+ vertical_tolerance))
return false;
if (positive(h_min-altitude) &&
!positive(std::max(GetClimbRate(), -GetCruiseDescent())
+ vertical_tolerance))
return false;
if (positive(distance_max) && !positive(GetCruiseSpeed()))
return false;
return true;
}