Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/RasterToPPM.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>
parents: 801
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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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10
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11 import java.awt.Color;
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12
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13 import java.io.IOException;
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14 import java.io.OutputStream;
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15
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16 /**
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17 * Little helper class to write a Raster into an output stream
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18 * as a Netpbm PPM file.
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19 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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20 */
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21 public class RasterToPPM
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22 {
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23 private RasterToPPM() {
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24 }
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25
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26 /**
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27 * Writes a Raster to a given stream as PPM.
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28 * @param raster The raster to be written.
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29 * @param palette The palette used to figure out the rgb values.
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30 * @param out The stream to write into.
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31 * @throws IOException Thrown if some error occurred during writing
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32 * data to the output stream.
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33 */
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34 public static void writeToPPM(
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35 Raster raster,
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36 Palette palette,
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37 OutputStream out
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38 )
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39 throws IOException
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40 {
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41 int W = raster.getWidth();
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42 int H = raster.getHeight();
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43 out.write(("P6\n" + W + " " + H + "\n255\n").getBytes("US-ASCII"));
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44 double [] values = raster.getValues();
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45 int pos = 0;
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46 byte [] data = new byte[W*3];
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47 int black = Color.BLACK.getRGB();
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48 for (int i = 0; i < H; ++i) {
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49 for (int j = 0; j < data.length; ++pos) {
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50 Palette.Entry entry = palette.getEntry(values[pos]);
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51 int rgb = entry == null
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52 ? black
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53 : entry.getColor().getRGB();
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54 data[j++] = (byte)((rgb >> 16) & 0xff);
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55 data[j++] = (byte)((rgb >> 8) & 0xff);
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56 data[j++] = (byte)( rgb & 0xff);
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57 }
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58 out.write(data);
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59 }
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60 out.flush();
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61 }
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62 }
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63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org