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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 1666:09c1292cf36d

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Bugfix: #351 Modified determination of single values specified by min/max values and an interval. flys-artifacts/trunk@2874 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 30 Sep 2011 14:29:26 +0000
parents 913b52064449
children da872168a899
rev   line source
655
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1 package de.intevation.flys.utils;
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2
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3 import java.util.Arrays;
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4
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5
655
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6 public class DoubleUtil
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7 {
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8 public static final double DEFAULT_STEP_PRECISION = 1e6;
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9
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10 private DoubleUtil() {
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11 }
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12
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13 public static final double [] explode(double from, double to, double step) {
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14 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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15 }
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16
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17 public static final double round(double x, double precision) {
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18 return Math.round(x * precision)/precision;
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19 }
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20
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21 public static final double round(double x) {
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22 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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23 }
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24
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25 public static final double [] explode(
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26 double from,
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27 double to,
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28 double step,
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29 double precision
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30 ) {
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31 double lower = from;
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32
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33 double diff = to - from;
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34 double tmp = diff / step;
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35 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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36
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37 double [] values = new double[num];
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38
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39 if (from > to) {
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40 step = -step;
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41 }
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42
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09c1292cf36d Bugfix: #351 Modified determination of single values specified by min/max values and an interval.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 655
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43 double max = Math.max(from, to);
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parents: 655
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44
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45 for (int idx = 0; idx < num; idx++) {
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09c1292cf36d Bugfix: #351 Modified determination of single values specified by min/max values and an interval.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 655
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46 if (lower > max) {
09c1292cf36d Bugfix: #351 Modified determination of single values specified by min/max values and an interval.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 655
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47 return Arrays.copyOfRange(values, 0, idx);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 655
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48 }
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parents: 655
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49
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50 values[idx] = round(lower, precision);
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51 lower += step;
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52 }
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53
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54 return values;
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55 }
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56 }
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57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org