Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearMetrics.java @ 836:05bf8534a35a

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Using unix line endings only. gnv-artifacts/trunk@938 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 18 Apr 2010 09:17:25 +0000
parents bb7afd783321
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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4
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5 /**
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6 * Implements {@link de.intevation.gnv.math.Metrics}
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7 * for linear interpolations and distance measurements.
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8 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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9 */
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10 public final class LinearMetrics
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11 implements Metrics
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12 {
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13 /**
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14 * Instance to prevent needless creations of instances.
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15 */
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16 public static final Metrics INSTANCE =
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17 new LinearMetrics();
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18
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19 /**
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20 * Implements the corresponding linear interpolator.
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21 */
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22 public static final class LinearInterpolator
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23 implements Interpolator
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24 {
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25 private double mx;
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26 private double bx;
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27 private double my;
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28 private double by;
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29
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30 /**
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31 * Constructor to create a linear interpolator between two
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32 * given points.
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33 * @param p1 The first point.
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34 * @param p2 The second point.
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35 */
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36 public LinearInterpolator(Coordinate p1, Coordinate p2) {
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37
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38 /*
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39 I) p1.x = 0*m + bx
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40 II) p2.x = 1*m + bx
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41
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42 bx = p1.x
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43
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44 p2.x = m + p1.x
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45
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46 mx = p2.x - p1.x
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47 */
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49 bx = p1.x;
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50 mx = p2.x - bx;
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52 by = p1.y;
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53 my = p2.y - by;
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54 }
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56 public void interpolate(double t, Coordinate v) {
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57 v.x = t*mx + bx;
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58 v.y = t*my + by;
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59 }
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60 } // class LinearInterpolator
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61
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62 private LinearMetrics() {
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63 }
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65 public double distance(Coordinate p1, Coordinate p2) {
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66 return p1.distance(p2);
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67 }
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69 public Interpolator getInterpolator(Coordinate p1, Coordinate p2) {
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70 return new LinearInterpolator(p1, p2);
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org