Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/KernelFilter.java @ 441:31a12ff53f99
Added raster filter framework for "Profilschnitte"
gnv-artifacts/trunk@489 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Tue, 29 Dec 2009 06:53:31 +0000 |
| parents | |
| children | b1f5f2a8840f |
comparison
equal
deleted
inserted
replaced
| 440:eb2ac62e853a | 441:31a12ff53f99 |
|---|---|
| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import org.w3c.dom.Element; | |
| 4 | |
| 5 import org.apache.log4j.Logger; | |
| 6 | |
| 7 /** | |
| 8 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) | |
| 9 */ | |
| 10 public class KernelFilter | |
| 11 implements Filter | |
| 12 { | |
| 13 private static Logger log = Logger.getLogger(KernelFilter.class); | |
| 14 | |
| 15 public static class GaussFactory | |
| 16 implements Filter.Factory | |
| 17 { | |
| 18 public static final double DEFAULT_SIGMA = 1.0d; | |
| 19 public static final int DEFAULT_RADIUS = 5; | |
| 20 | |
| 21 protected double sigma; | |
| 22 protected int radius; | |
| 23 | |
| 24 public GaussFactory() { | |
| 25 sigma = DEFAULT_SIGMA; | |
| 26 radius = DEFAULT_RADIUS; | |
| 27 } | |
| 28 | |
| 29 public void init(Element element) { | |
| 30 String s = element.getAttribute("sigma"); | |
| 31 String r = element.getAttribute("radius"); | |
| 32 | |
| 33 if ((s = s.trim()).length() > 0) { | |
| 34 try { | |
| 35 sigma = Math.abs(Double.parseDouble(s)); | |
| 36 } | |
| 37 catch (NumberFormatException nfe) { | |
| 38 log.warn("gauss sigma '" + s + "' not a valid float value."); | |
| 39 } | |
| 40 } | |
| 41 | |
| 42 if ((r = r.trim()).length() > 0) { | |
| 43 try { | |
| 44 radius = Math.min(3, Math.abs(Integer.parseInt(r))); | |
| 45 } | |
| 46 catch (NumberFormatException nfe) { | |
| 47 log.warn("gauss radius '" + r + "' not a valid integer value."); | |
| 48 } | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 public Filter create() { | |
| 53 return new KernelFilter(Raster.Kernel.createGauss(sigma, radius)); | |
| 54 } | |
| 55 } // class GaussFactory | |
| 56 | |
| 57 protected Raster.Kernel kernel; | |
| 58 | |
| 59 public KernelFilter() { | |
| 60 } | |
| 61 | |
| 62 public KernelFilter(Raster.Kernel kernel) { | |
| 63 this.kernel = kernel; | |
| 64 } | |
| 65 | |
| 66 public Raster filter(Raster raster) { | |
| 67 return raster.create(kernel); | |
| 68 } | |
| 69 } | |
| 70 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |