Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoAttributeGenerator.java @ 1119:7c4f81f74c47
merged gnv-artifacts
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:00 +0200 |
| parents | f953c9a559d8 |
| children |
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| 1027:fca4b5eb8d2f | 1119:7c4f81f74c47 |
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| 1 /* | |
| 2 * Copyright (c) 2010 by Intevation GmbH | |
| 3 * | |
| 4 * This program is free software under the LGPL (>=v2.1) | |
| 5 * Read the file LGPL.txt coming with the software for details | |
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | |
| 7 */ | |
| 8 | |
| 9 package de.intevation.gnv.raster; | |
| 10 | |
| 11 /** | |
| 12 * Generates label attributes for iso lines. It takes the | |
| 13 * neighboring palette ranges and calculates the mid point | |
| 14 * between these two ranges. | |
| 15 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 16 */ | |
| 17 public class IsoAttributeGenerator | |
| 18 implements IsoProducer.AttributeGenerator | |
| 19 { | |
| 20 /** | |
| 21 * The palette where to look for the ranges. | |
| 22 */ | |
| 23 protected Palette palette; | |
| 24 | |
| 25 /** | |
| 26 * Default constructor. | |
| 27 */ | |
| 28 public IsoAttributeGenerator() { | |
| 29 } | |
| 30 | |
| 31 /** | |
| 32 * Constructor to create an IsoAttributeGenerator with | |
| 33 * a given lookup palette. | |
| 34 * @param palette The palette. | |
| 35 */ | |
| 36 public IsoAttributeGenerator(Palette palette) { | |
| 37 this.palette = palette; | |
| 38 } | |
| 39 | |
| 40 public Object generateAttribute(int neighbor1, int neighbor2) { | |
| 41 Palette.Entry e1 = palette.getEntryByIndex(neighbor1); | |
| 42 Palette.Entry e2 = palette.getEntryByIndex(neighbor2); | |
| 43 | |
| 44 if (e1 == null || e2 == null) { | |
| 45 return null; | |
| 46 } | |
| 47 | |
| 48 double e1t = e1.getFrom(); | |
| 49 double e2f = e2.getTo(); | |
| 50 | |
| 51 return Double.valueOf(e2f >= e1t | |
| 52 ? 0.5d*(e1t+e2f) | |
| 53 : 0.5d*(e2.getTo()+e1.getFrom())); | |
| 54 } | |
| 55 } | |
| 56 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |