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Last change
on this file since 11 was 11, checked in by severine ovyn, 16 years ago |
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Fastjet added; CDFCones directory has been changed
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File size:
1.2 KB
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| 1 | #ifndef _CENTROID_HH_
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| 2 | #define _CENTROID_HH_
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| 3 |
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| 4 | #include <cmath>
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| 5 |
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| 6 | #ifndef M_PI
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| 7 | #define M_PI 3.141592653589793238462643383279502884197
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| 8 | #endif
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| 9 |
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| 10 | class Centroid
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| 11 | {
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| 12 | public:
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| 13 |
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| 14 | double Et,eta,phi;
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| 15 |
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| 16 | Centroid(): Et(0), eta(0), phi(0) {}
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| 17 | Centroid(double centroidEt, double centroidEta, double centroidPhi): Et(centroidEt), eta(centroidEta), phi(centroidPhi) {}
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| 18 | Centroid(const Centroid& c): Et(c.Et), eta(c.eta), phi(c.phi) {}
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| 19 | void add(Centroid c)
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| 20 | {
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| 21 | double newEt = Et + c.Et;
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| 22 | eta = (Et*eta + c.Et*c.eta)/newEt;
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| 23 | double dPhi = c.phi - phi;
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| 24 | if(dPhi > M_PI)
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| 25 | dPhi -= 2*M_PI;
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| 26 | else if(dPhi < -M_PI)
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| 27 | dPhi += 2*M_PI;
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| 28 | phi += dPhi*c.Et/newEt;
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| 29 | while(phi < 0)
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| 30 | phi += 2*M_PI;
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| 31 | while(phi >= 2*M_PI)
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| 32 | phi -= 2*M_PI;
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| 33 | Et = newEt;
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| 34 | }
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| 35 | void subtract(Centroid c)
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| 36 | {
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| 37 | double newEt = Et - c.Et;
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| 38 | eta = (Et*eta - c.Et*c.eta)/newEt;
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| 39 | double dPhi = c.phi - phi;
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| 40 | if(dPhi > M_PI)
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| 41 | dPhi -= 2*M_PI;
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| 42 | else if(dPhi < -M_PI)
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| 43 | dPhi += 2*M_PI;
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| 44 | phi -= dPhi*c.Et/newEt;
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| 45 | while(phi < 0)
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| 46 | phi += 2*M_PI;
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| 47 | while(phi >= 2*M_PI)
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| 48 | phi -= 2*M_PI;
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| 49 | Et = newEt;
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| 50 | }
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| 51 | bool isEqual(Centroid c)
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| 52 | {
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| 53 | return Et == c.Et && eta == c.eta && phi == c.phi;
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| 54 | }
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| 55 | };
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| 56 |
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| 57 | #endif
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