Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearMetrics.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.math;
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11 import com.vividsolutions.jts.geom.Coordinate;
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12
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13 /**
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14 * Implements {@link de.intevation.gnv.math.Metrics}
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15 * for linear interpolations and distance measurements.
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16 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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17 */
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18 public final class LinearMetrics
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19 implements Metrics
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20 {
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21 /**
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22 * Instance to prevent needless creations of instances.
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23 */
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24 public static final Metrics INSTANCE =
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25 new LinearMetrics();
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26
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27 /**
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28 * Implements the corresponding linear interpolator.
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29 */
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30 public static final class LinearInterpolator
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31 implements Interpolator
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32 {
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33 private double mx;
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34 private double bx;
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35 private double my;
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36 private double by;
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37
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38 /**
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39 * Constructor to create a linear interpolator between two
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40 * given points.
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41 * @param p1 The first point.
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42 * @param p2 The second point.
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43 */
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44 public LinearInterpolator(Coordinate p1, Coordinate p2) {
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45
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46 /*
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47 I) p1.x = 0*m + bx
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48 II) p2.x = 1*m + bx
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49
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50 bx = p1.x
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51
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52 p2.x = m + p1.x
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53
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54 mx = p2.x - p1.x
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55 */
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57 bx = p1.x;
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58 mx = p2.x - bx;
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60 by = p1.y;
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61 my = p2.y - by;
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62 }
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64 public void interpolate(double t, Coordinate v) {
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65 v.x = t*mx + bx;
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66 v.y = t*my + by;
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67 }
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68 } // class LinearInterpolator
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69
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70 private LinearMetrics() {
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71 }
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73 public double distance(Coordinate p1, Coordinate p2) {
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74 return p1.distance(p2);
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75 }
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77 public Interpolator getInterpolator(Coordinate p1, Coordinate p2) {
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78 return new LinearInterpolator(p1, p2);
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79 }
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80 }
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81 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org