Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoAttributeGenerator.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
f953c9a559d8 Added license file and license headers.
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.raster;
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11 /**
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12 * Generates label attributes for iso lines. It takes the
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13 * neighboring palette ranges and calculates the mid point
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14 * between these two ranges.
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15 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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16 */
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17 public class IsoAttributeGenerator
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18 implements IsoProducer.AttributeGenerator
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19 {
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20 /**
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21 * The palette where to look for the ranges.
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22 */
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23 protected Palette palette;
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24
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25 /**
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26 * Default constructor.
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27 */
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28 public IsoAttributeGenerator() {
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29 }
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30
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31 /**
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32 * Constructor to create an IsoAttributeGenerator with
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33 * a given lookup palette.
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34 * @param palette The palette.
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35 */
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36 public IsoAttributeGenerator(Palette palette) {
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37 this.palette = palette;
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38 }
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39
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40 public Object generateAttribute(int neighbor1, int neighbor2) {
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41 Palette.Entry e1 = palette.getEntryByIndex(neighbor1);
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42 Palette.Entry e2 = palette.getEntryByIndex(neighbor2);
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43
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44 if (e1 == null || e2 == null) {
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45 return null;
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46 }
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47
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48 double e1t = e1.getFrom();
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49 double e2f = e2.getTo();
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50
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51 return Double.valueOf(e2f >= e1t
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52 ? 0.5d*(e1t+e2f)
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53 : 0.5d*(e2.getTo()+e1.getFrom()));
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54 }
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55 }
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56 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org