Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/Linear.java @ 4173:7d4480c0e68e

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Allow users to select the current relevant discharge table in historical discharge table calculattion. In addition to this, the discharge tables in the helper panel displayed in the client is ordered in time.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 18 Oct 2012 12:13:48 +0200
parents da1969b05292
children
rev   line source
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1 package de.intevation.flys.artifacts.math;
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3 public final class Linear
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4 implements Function
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5 {
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6 private double m;
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7 private double b;
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8
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9 public Linear(
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10 double x1, double x2,
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11 double y1, double y2
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12 ) {
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13 // y1 = m*x1 + b
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14 // y2 = m*x2 + b
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15 // y2 - y1 = m*(x2 - x1)
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16 // m = (y2 - y1)/(x2 - x1) # x2 != x1
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17 // b = y1 - m*x1
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18
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19 if (x1 == x2) {
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20 m = 0;
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21 b = 0.5*(y1 + y2);
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22 }
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23 else {
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24 m = (y2 - y1)/(x2 - x1);
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25 b = y1 - m*x1;
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26 }
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27 }
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28
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29 public static final double linear(
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30 double x,
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31 double x1, double x2,
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32 double y1, double y2
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33 ) {
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34 // y1 = m*x1 + b
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35 // y2 = m*x2 + b
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36 // y2 - y1 = m*(x2 - x1)
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37 // m = (y2 - y1)/(x2 - x1) # x2 != x1
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38 // b = y1 - m*x1
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39
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40 if (x1 == x2) {
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41 return 0.5*(y1 + y2);
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42 }
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43 double m = (y2 - y1)/(x2 - x1);
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44 double b = y1 - m*x1;
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45 return x*m + b;
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46 }
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47
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48 @Override
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49 public double value(double x) {
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50 return m*x + b;
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51 }
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52
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53 public static final double factor(double x, double p1, double p2) {
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54 // 0 = m*p1 + b <=> b = -m*p1
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55 // 1 = m*p2 + b
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56 // 1 = m*(p2 - p1)
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57 // m = 1/(p2 - p1) # p1 != p2
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58 // f(x) = x/(p2-p1) - p1/(p2-p1) <=> (x-p1)/(p2-p1)
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59
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60 return p1 == p2 ? 0.0 : (x-p1)/(p2-p1);
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61 }
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62
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63 public static final double weight(double factor, double a, double b) {
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64 //return (1.0-factor)*a + factor*b;
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65 return a + factor*(b-a);
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66 }
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67
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68 public static final void weight(
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69 double factor,
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70 double [] a, double [] b, double [] c
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71 ) {
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72 int N = Math.min(Math.min(a.length, b.length), c.length);
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73 for (int i = 0; i < N; ++i) {
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74 c[i] = weight(factor, a[i], b[i]);
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75 }
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76 }
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77 }
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78 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org