Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/RasterToPPM.java @ 875:5e9efdda6894
merged gnv-artifacts/1.0
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:56 +0200 |
| parents | d766fe2d917a |
| children | f953c9a559d8 |
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| 722:bb3ffe7d719e | 875:5e9efdda6894 |
|---|---|
| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import java.awt.Color; | |
| 4 | |
| 5 import java.io.IOException; | |
| 6 import java.io.OutputStream; | |
| 7 | |
| 8 /** | |
| 9 * Little helper class to write a Raster into an output stream | |
| 10 * as a Netpbm PPM file. | |
| 11 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 12 */ | |
| 13 public class RasterToPPM | |
| 14 { | |
| 15 private RasterToPPM() { | |
| 16 } | |
| 17 | |
| 18 /** | |
| 19 * Writes a Raster to a given stream as PPM. | |
| 20 * @param raster The raster to be written. | |
| 21 * @param palette The palette used to figure out the rgb values. | |
| 22 * @param out The stream to write into. | |
| 23 * @throws IOException Thrown if some error occurred during writing | |
| 24 * data to the output stream. | |
| 25 */ | |
| 26 public static void writeToPPM( | |
| 27 Raster raster, | |
| 28 Palette palette, | |
| 29 OutputStream out | |
| 30 ) | |
| 31 throws IOException | |
| 32 { | |
| 33 int W = raster.getWidth(); | |
| 34 int H = raster.getHeight(); | |
| 35 out.write(("P6\n" + W + " " + H + "\n255\n").getBytes("US-ASCII")); | |
| 36 double [] values = raster.getValues(); | |
| 37 int pos = 0; | |
| 38 byte [] data = new byte[W*3]; | |
| 39 int black = Color.BLACK.getRGB(); | |
| 40 for (int i = 0; i < H; ++i) { | |
| 41 for (int j = 0; j < data.length; ++pos) { | |
| 42 Palette.Entry entry = palette.getEntry(values[pos]); | |
| 43 int rgb = entry == null | |
| 44 ? black | |
| 45 : entry.getColor().getRGB(); | |
| 46 data[j++] = (byte)((rgb >> 16) & 0xff); | |
| 47 data[j++] = (byte)((rgb >> 8) & 0xff); | |
| 48 data[j++] = (byte)( rgb & 0xff); | |
| 49 } | |
| 50 out.write(data); | |
| 51 } | |
| 52 out.flush(); | |
| 53 } | |
| 54 } | |
| 55 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |