Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/utils/DataUtil.java @ 7081:3c4efd4b2c19 generator-refactoring

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Simplyfy / unify "invert axis" logic - DataUtil now can check if two datasets are in the same direction - In the case of WKM data a no means that the Water flows Right to Left - If the water flows from right to left do inversion of diagrams
author Andre Heinecke <aheinecke@intevation.de>
date Fri, 20 Sep 2013 17:36:11 +0200
parents af13ceeba52a
children 5e38e2924c07
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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Sascha L. Teichmann <teichmann@intevation.de>
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.utils;
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11 import java.util.Random;
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12
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13 import gnu.trove.TDoubleArrayList;
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14
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15 public class DataUtil
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16 {
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17 public static boolean guessDataIncreasing(TDoubleArrayList data) {
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18 return guessDataIncreasing(data, 0.05f);
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19 }
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20
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21 /** Guess if data1 and data2 both grow in the same direction */
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22 public static boolean guessSameDirectionData(TDoubleArrayList data1,
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23 TDoubleArrayList data2) {
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24 boolean d1dir = DataUtil.guessDataIncreasing(data1, 0.05f);
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25 boolean d2dir = DataUtil.guessDataIncreasing(data2, 0.05f);
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26 int size = data1.size();
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27 return ((d1dir && d2dir) || (!d1dir && !d2dir)) && size > 1;
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28 }
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29
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30 public static boolean guessDataIncreasing(TDoubleArrayList data, float factor) {
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31 int N = data.size();
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32 if (N < 2) return false;
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33
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34 int samples = (int)(factor*N) + 1;
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35
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36 int up = 0;
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37
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38 Random rand = new Random();
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39
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40 for (int i = 0; i < samples; ++i) {
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41 int pos2 = rand.nextInt(N-1) + 1;
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42 int pos1 = rand.nextInt(pos2);
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43 double w1 = data.getQuick(pos1);
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44 double w2 = data.getQuick(pos2);
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45 if (w2 > w1) ++up;
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46 }
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47
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48 return up > samples/2;
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49 }
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50 }
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8afd6a9bb244 Cosmetics.
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51 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org