Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearMetrics.java @ 360:ee760729f6b8

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Added mapping from linear diagram space to 2D map coordinates. gnv-artifacts/trunk@434 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 15 Dec 2009 15:58:58 +0000
parents
children aec85d00d82c
rev   line source
360
ee760729f6b8 Added mapping from linear diagram space to 2D map coordinates.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.gnv.math;
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2
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3 import java.awt.geom.Point2D;
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4
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5 import de.intevation.gnv.math.LinearToMap.Metrics;
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6 import de.intevation.gnv.math.LinearToMap.Interpolator;
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7
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8 /**
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9 * @author Sascha L. Teichmann
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10 */
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11 public final class LinearMetrics
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12 implements Metrics
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13 {
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14 public static final Metrics INSTANCE =
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15 new LinearMetrics();
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16
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17 public static final class LinearInterpolator
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18 implements Interpolator
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19 {
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20 private double mx;
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21 private double bx;
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22 private double my;
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23 private double by;
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24
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25 public LinearInterpolator(Point2D p1, Point2D p2) {
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26
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27 /*
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28 I) p1.x = 0*m + bx
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29 II) p2.x = 1*m + bx
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30
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31 bx = p1.x
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32
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33 p2.x = m + p1.x
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34
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35 mx = p2.x - p1.x
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36 */
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37
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38 bx = p1.getX();
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39 mx = p2.getX() - bx;
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40
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41 by = p1.getY();
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42 my = p2.getY() - by;
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43 }
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44
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45 public void interpolate(double t, Point2D v) {
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46 double x = t*mx + bx;
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47 double y = t*my + by;
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48 v.setLocation(x, y);
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49 }
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50 } // class LinearInterpolator
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51
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52 private LinearMetrics() {
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53 }
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54
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55 public double distance(Point2D p1, Point2D p2) {
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56 return p1.distance(p2);
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57 }
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58
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59 public Interpolator getInterpolator(Point2D p1, Point2D p2) {
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60 return new LinearInterpolator(p1, p2);
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61 }
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62 }
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63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org