Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/Linear.java @ 1663:4fbd43061315
Show proper labels for selected differences.
flys-artifacts/trunk@2866 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 30 Sep 2011 05:31:34 +0000 |
parents | c09c9e05ecfa |
children | da1969b05292 |
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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 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |