Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/utils/DataUtil.java @ 1190:f514894ec2fd
merged flys-artifacts/2.5
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:17 +0200 |
| parents | 2e0739853807 |
| children | 03fbf1b30e72 |
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| 917:b48c36076e17 | 1190:f514894ec2fd |
|---|---|
| 1 package de.intevation.flys.utils; | |
| 2 | |
| 3 import java.util.Random; | |
| 4 | |
| 5 import de.intevation.flys.artifacts.model.WKms; | |
| 6 | |
| 7 public class DataUtil | |
| 8 { | |
| 9 // TODO: resolve duplicate in WQKms | |
| 10 public static boolean guessWaterIncreasing(WKms wkms) { | |
| 11 return guessWaterIncreasing(wkms, 0.05f); | |
| 12 } | |
| 13 | |
| 14 // TODO: resolve duplicate in WQKms | |
| 15 public static boolean guessWaterIncreasing(WKms wkms, float factor) { | |
| 16 int N = wkms.size(); | |
| 17 if (N < 2) return false; | |
| 18 | |
| 19 int samples = (int)(factor*N) + 1; | |
| 20 | |
| 21 int up = 0; | |
| 22 | |
| 23 Random rand = new Random(); | |
| 24 | |
| 25 for (int i = 0; i < samples; ++i) { | |
| 26 int pos2 = rand.nextInt(N-1) + 1; | |
| 27 if (pos2 == 0) continue; | |
| 28 int pos1 = rand.nextInt(pos2); | |
| 29 double w1 = wkms.getW(pos1); | |
| 30 double w2 = wkms.getW(pos2); | |
| 31 if (w2 > w1) ++up; | |
| 32 } | |
| 33 | |
| 34 return up > samples/2; | |
| 35 } | |
| 36 } |