Last change
on this file since 1051 was 35, checked in by Xavier Rouby, 16 years ago |
first attemp towers CMS
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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 | double Et,eta,phi;
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14 |
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15 | Centroid(): Et(0), eta(0), phi(0) {}
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16 | Centroid(double centroidEt, double centroidEta, double centroidPhi): Et(centroidEt), eta(centroidEta), phi(centroidPhi) {}
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17 | Centroid(const Centroid& c): Et(c.Et), eta(c.eta), phi(c.phi) {}
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18 | void add(const Centroid& c)
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19 | {
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20 | double newEt = Et + c.Et;
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21 | eta = (Et*eta + c.Et*c.eta)/newEt;
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22 | double dPhi = c.phi - phi;
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23 | if(dPhi > M_PI)
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24 | dPhi -= 2*M_PI;
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25 | else if(dPhi < -M_PI)
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26 | dPhi += 2*M_PI;
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27 | phi += dPhi*c.Et/newEt;
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28 | while(phi < 0)
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29 | phi += 2*M_PI;
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30 | while(phi >= 2*M_PI)
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31 | phi -= 2*M_PI;
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32 | Et = newEt;
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33 | }
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34 | void subtract(const Centroid& c)
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35 | {
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36 | double newEt = Et - c.Et;
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37 | eta = (Et*eta - c.Et*c.eta)/newEt;
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38 | double dPhi = c.phi - phi;
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39 | if(dPhi > M_PI)
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40 | dPhi -= 2*M_PI;
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41 | else if(dPhi < -M_PI)
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42 | dPhi += 2*M_PI;
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43 | phi -= dPhi*c.Et/newEt;
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44 | while(phi < 0)
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45 | phi += 2*M_PI;
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46 | while(phi >= 2*M_PI)
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47 | phi -= 2*M_PI;
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48 | Et = newEt;
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49 | }
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50 | bool isEqual(const Centroid& c)
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51 | {
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52 | return Et == c.Et && eta == c.eta && phi == c.phi;
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53 | }
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54 | };
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55 |
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56 | #endif
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