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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 682:591249171c32

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#77 The curves in a duration chart will have names now. flys-artifacts/trunk@2115 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 14 Jun 2011 15:34:27 +0000
parents 913b52064449
children 09c1292cf36d
rev   line source
655
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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 :
http://dive4elements.wald.intevation.org