Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/RasterToPPM.java @ 814:9d427dd2a96a

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Added Javadoc in statistic package. gnv-artifacts/trunk@898 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 09 Apr 2010 14:34:45 +0000
parents d766fe2d917a
children f953c9a559d8
rev   line source
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6e8364e766fa Generate JTS geometries of "Horizontalschnitte" correctly.
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1 package de.intevation.gnv.raster;
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2
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3 import java.awt.Color;
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4
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5 import java.io.IOException;
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6 import java.io.OutputStream;
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7
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8 /**
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9 * Little helper class to write a Raster into an output stream
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10 * as a Netpbm PPM file.
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c4156275c1e1 Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
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11 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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12 */
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13 public class RasterToPPM
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14 {
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15 private RasterToPPM() {
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16 }
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17
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18 /**
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19 * Writes a Raster to a given stream as PPM.
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20 * @param raster The raster to be written.
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21 * @param palette The palette used to figure out the rgb values.
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22 * @param out The stream to write into.
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23 * @throws IOException Thrown if some error occurred during writing
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24 * data to the output stream.
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25 */
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26 public static void writeToPPM(
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27 Raster raster,
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28 Palette palette,
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29 OutputStream out
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30 )
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31 throws IOException
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32 {
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33 int W = raster.getWidth();
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34 int H = raster.getHeight();
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35 out.write(("P6\n" + W + " " + H + "\n255\n").getBytes("US-ASCII"));
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36 double [] values = raster.getValues();
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37 int pos = 0;
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38 byte [] data = new byte[W*3];
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39 int black = Color.BLACK.getRGB();
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40 for (int i = 0; i < H; ++i) {
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41 for (int j = 0; j < data.length; ++pos) {
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42 Palette.Entry entry = palette.getEntry(values[pos]);
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43 int rgb = entry == null
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44 ? black
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45 : entry.getColor().getRGB();
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46 data[j++] = (byte)((rgb >> 16) & 0xff);
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47 data[j++] = (byte)((rgb >> 8) & 0xff);
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48 data[j++] = (byte)( rgb & 0xff);
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49 }
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50 out.write(data);
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51 }
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52 out.flush();
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53 }
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54 }
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55 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org