Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 1106:e9f66d63bdd0
Write user defined barriers into a shapefile that is placed in the Artifact's directory.
flys-artifacts/trunk@2609 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 30 Aug 2011 11:09:54 +0000 |
parents | 913b52064449 |
children | 09c1292cf36d |
rev | line source |
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Refactored version of "Berechnung 4"
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1 package de.intevation.flys.utils; |
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2 |
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3 public class DoubleUtil |
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4 { |
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5 public static final double DEFAULT_STEP_PRECISION = 1e6; |
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6 |
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7 private DoubleUtil() { |
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8 } |
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9 |
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10 public static final double [] explode(double from, double to, double step) { |
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11 return explode(from, to, step, DEFAULT_STEP_PRECISION); |
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12 } |
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13 |
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14 public static final double round(double x, double precision) { |
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15 return Math.round(x * precision)/precision; |
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16 } |
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17 |
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18 public static final double round(double x) { |
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19 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION; |
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20 } |
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21 |
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22 public static final double [] explode( |
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23 double from, |
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24 double to, |
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25 double step, |
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26 double precision |
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27 ) { |
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28 double lower = from; |
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29 |
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30 double diff = to - from; |
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31 double tmp = diff / step; |
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32 int num = (int)Math.abs(Math.ceil(tmp)) + 1; |
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33 |
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34 double [] values = new double[num]; |
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35 |
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36 if (from > to) { |
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37 step = -step; |
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38 } |
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39 |
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40 for (int idx = 0; idx < num; idx++) { |
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41 values[idx] = round(lower, precision); |
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42 lower += step; |
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43 } |
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44 |
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45 return values; |
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46 } |
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47 } |
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48 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |