Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 655:913b52064449
Refactored version of "Berechnung 4"
flys-artifacts/trunk@2053 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Sun, 05 Jun 2011 18:24:46 +0000 |
| parents | |
| children | 09c1292cf36d |
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| 654:bbc966c81809 | 655:913b52064449 |
|---|---|
| 1 package de.intevation.flys.utils; | |
| 2 | |
| 3 public class DoubleUtil | |
| 4 { | |
| 5 public static final double DEFAULT_STEP_PRECISION = 1e6; | |
| 6 | |
| 7 private DoubleUtil() { | |
| 8 } | |
| 9 | |
| 10 public static final double [] explode(double from, double to, double step) { | |
| 11 return explode(from, to, step, DEFAULT_STEP_PRECISION); | |
| 12 } | |
| 13 | |
| 14 public static final double round(double x, double precision) { | |
| 15 return Math.round(x * precision)/precision; | |
| 16 } | |
| 17 | |
| 18 public static final double round(double x) { | |
| 19 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION; | |
| 20 } | |
| 21 | |
| 22 public static final double [] explode( | |
| 23 double from, | |
| 24 double to, | |
| 25 double step, | |
| 26 double precision | |
| 27 ) { | |
| 28 double lower = from; | |
| 29 | |
| 30 double diff = to - from; | |
| 31 double tmp = diff / step; | |
| 32 int num = (int)Math.abs(Math.ceil(tmp)) + 1; | |
| 33 | |
| 34 double [] values = new double[num]; | |
| 35 | |
| 36 if (from > to) { | |
| 37 step = -step; | |
| 38 } | |
| 39 | |
| 40 for (int idx = 0; idx < num; idx++) { | |
| 41 values[idx] = round(lower, precision); | |
| 42 lower += step; | |
| 43 } | |
| 44 | |
| 45 return values; | |
| 46 } | |
| 47 } | |
| 48 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |