Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearMetrics.java @ 478:0e0c64c821dc

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Added support to step back to the point for choosing a product. gnv-artifacts/trunk@547 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 15 Jan 2010 18:21:49 +0000
parents aec85d00d82c
children 6cff63d0c434
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 * @author Sascha L. Teichmann
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7 */
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8 public final class LinearMetrics
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9 implements Metrics
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10 {
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11 public static final Metrics INSTANCE =
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12 new LinearMetrics();
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13
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14 public static final class LinearInterpolator
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15 implements Interpolator
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16 {
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17 private double mx;
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18 private double bx;
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19 private double my;
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20 private double by;
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22 public LinearInterpolator(Coordinate p1, Coordinate p2) {
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23
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24 /*
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25 I) p1.x = 0*m + bx
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26 II) p2.x = 1*m + bx
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27
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28 bx = p1.x
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29
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30 p2.x = m + p1.x
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31
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32 mx = p2.x - p1.x
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33 */
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35 bx = p1.x;
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36 mx = p2.x - bx;
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38 by = p1.y;
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39 my = p2.y - by;
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40 }
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42 public void interpolate(double t, Coordinate v) {
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43 v.x = t*mx + bx;
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44 v.y = t*my + by;
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45 }
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46 } // class LinearInterpolator
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47
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48 private LinearMetrics() {
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49 }
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51 public double distance(Coordinate p1, Coordinate p2) {
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52 return p1.distance(p2);
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53 }
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55 public Interpolator getInterpolator(Coordinate p1, Coordinate p2) {
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56 return new LinearInterpolator(p1, p2);
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57 }
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58 }
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59 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org