RectangularEtaPhiRegion.h

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#ifndef DataFormats_Math_RectangularEtaPhiRegion_h
#define DataFormats_Math_RectangularEtaPhiRegion_h

#include "DataFormats/Math/interface/normalizedPhi.h"

class RectangularEtaPhiRegion
{
 public:

  RectangularEtaPhiRegion(float etaLow, float etaHigh, float phiLow, float phiHigh) :
   ceta(0.5f*(etaHigh+etaLow)),deta(0.5f*std::abs(etaHigh-etaLow))
  {
   phiHigh = proxim(phiHigh,phiLow);
   constexpr float c1 = 2.*M_PI;
   if (phiHigh<phiLow) phiHigh+=c1;
   dphi = 0.5f*(phiHigh-phiLow);
   cphi = phiLow+dphi;
   }

  bool inRegion(float eta, float phi) const {
    return std::abs(eta-ceta)<deta &&
           std::abs(proxim(phi,cphi)-cphi)<dphi;
  }

  auto etaLow()  const { return ceta-deta; }
  auto etaHigh() const { return ceta+deta; }
  auto phiLow()  const { return cphi-dphi; }
  auto phiHigh() const { return cphi+dphi; }

 private:

  float ceta;
  float deta; 
  float cphi; 
  float dphi;

};

#endif