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annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoAttributeGenerator.java @ 1061:13bea93a070a

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Do not call the endOfLife method of the current state before advancing to a next state, because this would remove elements from cache that have been inserted just before - it would be impossible to make use of a cache in that case. gnv-artifacts/trunk@1144 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 01 Jun 2010 16:59:15 +0000
parents 4abe172be970
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 /**
802
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4 * Generates label attributes for iso lines. It takes the
4abe172be970 Finished Javadoc of the raster package.
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5 * neighboring palette ranges and calculates the mid point
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6 * between these two ranges.
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7 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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8 */
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9 public class IsoAttributeGenerator
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10 implements IsoProducer.AttributeGenerator
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11 {
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12 /**
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13 * The palette where to look for the ranges.
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14 */
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15 protected Palette palette;
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16
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17 /**
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18 * Default constructor.
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19 */
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20 public IsoAttributeGenerator() {
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21 }
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22
802
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23 /**
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24 * Constructor to create an IsoAttributeGenerator with
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25 * a given lookup palette.
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26 * @param palette The palette.
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27 */
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28 public IsoAttributeGenerator(Palette palette) {
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29 this.palette = palette;
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30 }
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31
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32 public Object generateAttribute(int neighbor1, int neighbor2) {
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33 Palette.Entry e1 = palette.getEntryByIndex(neighbor1);
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34 Palette.Entry e2 = palette.getEntryByIndex(neighbor2);
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35
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36 if (e1 == null || e2 == null) {
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37 return null;
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38 }
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39
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40 double e1t = e1.getFrom();
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41 double e2f = e2.getTo();
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42
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43 return Double.valueOf(e2f >= e1t
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44 ? 0.5d*(e1t+e2f)
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45 : 0.5d*(e2.getTo()+e1.getFrom()));
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46 }
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47 }
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48 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org