// Constructor to initialize Exponential functions for 1D deviate photon shooting
ExponentialInfo::ExponentialInfo(const GSParamsPtr& gsparams)
{
dbg<<"Start ExponentialInfo with gsparams = "<<gsparams.get()<<std::endl;
#ifndef USE_NEWTON_RAPHSON
// Next, set up the classes for photon shooting
_radial.reset(new ExponentialRadialFunction());
dbg<<"Made radial"<<std::endl;
std::vector<double> range(2,0.);
range[1] = -std::log(gsparams->shoot_accuracy);
_sampler.reset(new OneDimensionalDeviate( *_radial, range, true, gsparams));
dbg<<"Made sampler"<<std::endl;
#endif
// Calculate maxk:
_maxk = std::pow(gsparams->maxk_threshold, -1./3.);
dbg<<"maxk = "<<_maxk<<std::endl;
// Calculate stepk:
// int( exp(-r) r, r=0..R) = (1 - exp(-R) - Rexp(-R))
// Fraction excluded is thus (1+R) exp(-R)
// A fast solution to (1+R)exp(-R) = x:
// log(1+R) - R = log(x)
// R = log(1+R) - log(x)
double logx = std::log(gsparams->folding_threshold);
double R = -logx;
for (int i=0; i<3; i++) R = std::log(1.+R) - logx;
// Make sure it is at least 5 hlr
// half-light radius = 1.6783469900166605 * r0
const double hlr = 1.6783469900166605;
R = std::max(R,gsparams->stepk_minimum_hlr*hlr);
_stepk = M_PI / R;
dbg<<"stepk = "<<_stepk<<std::endl;
}
SBAiry::SBAiryImpl::SBAiryImpl(double lam_over_D, double obscuration, double flux,
const GSParamsPtr& gsparams) :
SBProfileImpl(gsparams),
_lam_over_D(lam_over_D),
_D(1. / lam_over_D),
_obscuration(obscuration),
_flux(flux),
_Dsq(_D*_D), _obssq(_obscuration*_obscuration),
_inv_D_pi(1. / (_D * M_PI)),
_inv_Dsq_pisq(_inv_D_pi * _inv_D_pi),
_xnorm(flux * _Dsq),
_knorm(flux / (M_PI * (1.-_obssq))),
_info(cache.get(std::make_pair(_obscuration, this->gsparams.duplicate())))
{
xdbg<<"SBAiryImpl constructor: gsparams = "<<gsparams.get()<<std::endl;
xdbg<<"this->gsparams = "<<this->gsparams.get()<<std::endl;
xdbg<<*this->gsparams<<std::endl;
}
