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#ifndef JET_JETUTIL_H
#define JET_JETUTIL_H 1
#include <cmath>
#include <algorithm>
class PtGreater {
public:
template <typename T>
bool operator()(const T& i, const T& j) {
return (i.pt() > j.pt());
}
};
class EtGreater {
public:
template <typename T>
bool operator()(const T& i, const T& j) {
return (i.et() > j.et());
}
};
class JetUtil {
public:
static double Phi_0_2pi(double x) {
while (x >= 2 * M_PI)
x -= 2 * M_PI;
while (x < 0.)
x += 2 * M_PI;
return x;
}
static double Phi_mpi_pi(double x) {
while (x >= M_PI)
x -= 2 * M_PI;
while (x < -M_PI)
x += 2 * M_PI;
return x;
}
static double dPhi(double phi1, double phi2) {
phi1 = Phi_0_2pi(phi1);
phi2 = Phi_0_2pi(phi2);
return Phi_mpi_pi(phi1 - phi2);
}
static double radius(double eta1, double phi1, double eta2, double phi2) {
const double TWOPI = 2.0 * M_PI;
phi1 = Phi_0_2pi(phi1);
phi2 = Phi_0_2pi(phi2);
double dphi = Phi_0_2pi(phi1 - phi2);
dphi = std::min(dphi, TWOPI - dphi);
double deta = eta1 - eta2;
return sqrt(deta * deta + dphi * dphi);
}
template <typename T1, typename T2>
static double radius(const T1& t1, const T2& t2) {
return radius(t1->eta(), t1->phi(), t2->eta(), t2->phi());
}
};
#endif
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