Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/LinearRemap.java @ 622:02ca2ff96dee

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flys/issue84: Forget to select wst kind. flys-artifacts/trunk@1978 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 May 2011 13:35:52 +0000
parents 343f248e4c8c
children f0c1250d1e7b
rev   line source
427
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1 package de.intevation.flys.artifacts.math;
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2
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3 import org.apache.log4j.Logger;
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4
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5 public class LinearRemap
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6 {
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7 private static Logger logger = Logger.getLogger(LinearRemap.class);
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8
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9 public static class Segment {
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11 protected Segment next;
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13 protected double from;
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14 protected double to;
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16 protected double m;
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17 protected double b;
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19 public Segment() {
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20 }
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22 public Segment(
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23 double from, double to,
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24 double m, double b,
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25 Segment next
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26 ) {
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27 this.from = from;
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28 this.to = to;
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29 this.m = m;
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30 this.b = b;
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31 }
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33 public double eval(double x) {
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34 return m*x + b;
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35 }
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36 } // class Segment
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38 protected Segment head;
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40 public LinearRemap() {
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41 }
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43 public void add(
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44 double from, double to,
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45 double x1, double y1,
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46 double x2, double y2
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47 ) {
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48 // y1 = m*x1 + b <=> b = y1 - m*x1
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49 // y2 = m*x2 + b
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50 // y2 - y1 = m*(x2 - x1)
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51 // m = (y2 - y1)/(x2 - x1)
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53 double m, b;
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54
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55 if (x2 == x1) {
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56 m = 0.0;
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57 b = 0.5*(y2 + y1);
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58 }
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59 else {
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60 m = (y2 - y1)/(x2 - x1);
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61 b = y1 - m*x1;
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62 }
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63
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64 head = new Segment(from, to, m, b, head);
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65
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66 if (logger.isDebugEnabled()) {
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67 logger.debug("LinearRemap.add --------- enter");
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68 logger.debug(" range: [" + from + ", " + to + "]");
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69 logger.debug(" " + x1 + " -> " + y1 + " (" + head.eval(x1) + ")");
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70 logger.debug(" " + x2 + " -> " + y2 + " (" + head.eval(x2) + ")");
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71 logger.debug("LinearRemap.add --------- leave");
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72 }
427
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73 }
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75 public double eval(double pos, double x) {
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76 Segment current = head;
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78 while (current != null) {
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79
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80 if (pos >= current.from && pos <= current.to) {
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81 return current.eval(x);
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82 }
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83
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84 current = current.next;
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85 }
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86
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87 return Double.NaN;
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88 }
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89 }
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90 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org