Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/Linear.java @ 6942:b77a1e804c0a
Slightly better name for flowvelocitymeasurementvaluefacets.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 29 Aug 2013 12:15:05 +0200 |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.math; |
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10 |
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11 public final class Linear |
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12 implements Function |
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13 { |
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14 private double m; |
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15 private double b; |
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16 |
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17 public Linear( |
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18 double x1, double x2, |
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19 double y1, double y2 |
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20 ) { |
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21 // y1 = m*x1 + b |
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22 // y2 = m*x2 + b |
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23 // y2 - y1 = m*(x2 - x1) |
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24 // m = (y2 - y1)/(x2 - x1) # x2 != x1 |
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25 // b = y1 - m*x1 |
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26 |
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27 if (x1 == x2) { |
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28 m = 0; |
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29 b = 0.5*(y1 + y2); |
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30 } |
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31 else { |
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32 m = (y2 - y1)/(x2 - x1); |
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33 b = y1 - m*x1; |
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34 } |
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35 } |
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36 |
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37 public static final double linear( |
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38 double x, |
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39 double x1, double x2, |
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40 double y1, double y2 |
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41 ) { |
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42 // y1 = m*x1 + b |
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43 // y2 = m*x2 + b |
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44 // y2 - y1 = m*(x2 - x1) |
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45 // m = (y2 - y1)/(x2 - x1) # x2 != x1 |
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46 // b = y1 - m*x1 |
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47 |
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48 if (x1 == x2) { |
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49 return 0.5*(y1 + y2); |
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50 } |
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51 double m = (y2 - y1)/(x2 - x1); |
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52 double b = y1 - m*x1; |
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53 return x*m + b; |
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54 } |
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55 |
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56 @Override |
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57 public double value(double x) { |
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58 return m*x + b; |
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59 } |
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60 |
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61 public static final double factor(double x, double p1, double p2) { |
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62 // 0 = m*p1 + b <=> b = -m*p1 |
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63 // 1 = m*p2 + b |
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64 // 1 = m*(p2 - p1) |
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65 // m = 1/(p2 - p1) # p1 != p2 |
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66 // f(x) = x/(p2-p1) - p1/(p2-p1) <=> (x-p1)/(p2-p1) |
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67 |
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68 return p1 == p2 ? 0.0 : (x-p1)/(p2-p1); |
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69 } |
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70 |
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71 public static final double weight(double factor, double a, double b) { |
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72 //return (1.0-factor)*a + factor*b; |
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73 return a + factor*(b-a); |
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74 } |
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75 |
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76 public static final void weight( |
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77 double factor, |
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78 double [] a, double [] b, double [] c |
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79 ) { |
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80 int N = Math.min(Math.min(a.length, b.length), c.length); |
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81 for (int i = 0; i < N; ++i) { |
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82 c[i] = weight(factor, a[i], b[i]); |
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83 } |
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84 } |
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85 } |
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86 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |