Java/2D Graphics GUI/JAI

Check Alignment Descriptor

<source lang="java"> /* Java Media APIs: Cross-Platform Imaging, Media and Visualization Alejandro Terrazas Sams, Published November 2002, ISBN 0672320940

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import javax.media.jai.OperationDescriptorImpl; import javax.media.jai.registry.RenderedRegistryMode; public class CheckAlignmentDescriptor extends OperationDescriptorImpl {

 private static final String[] paramNames = { "samplingPeriod" };
 private static final Object[] paramDefaults = { new Integer(1) };
 private static final Class[] paramClasses = { Integer.class };
 private static final int numSources = 2;
 private static final String[] supportedModes = { "rendered" };
 private static final Object[] validParamValues = { new javax.media.jai.util.Range(
     Integer.class, new Integer(1), new Integer(Integer.MAX_VALUE)) };
 private static final String[][] resources = {
     { "GlobalName", "CheckAlignment" },
     { "LocalName", "CheckAlignment" }, { "Vender", "Ostuni" },
     { "Description", "Provides Visual Alignment Check of Two Images" },
     { "DocURL", "none" }, { "Version", "Beta" }, };
 public CheckAlignmentDescriptor() {
   super(resources, supportedModes, numSources, paramNames, paramClasses,
       paramDefaults, validParamValues);
 }

}

      </source>   

Check AlignmentOpImage

<source lang="java"> /* Java Media APIs: Cross-Platform Imaging, Media and Visualization Alejandro Terrazas Sams, Published November 2002, ISBN 0672320940

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import javax.media.jai.ImageLayout; import javax.media.jai.PointOpImage; import java.awt.image.RenderedImage; import java.awt.image.Raster; import java.awt.image.WritableRaster; public class CheckAlignmentOpImage extends PointOpImage {

 public CheckAlignmentOpImage(RenderedImage s1, RenderedImage s2, int sp,
     ImageLayout layout, java.util.Map configuration,
     boolean cobbleSources) {
   super(s1, s2, layout, configuration, cobbleSources);
   source1 = s1;
   source2 = s2;
   samplingPeriod = sp;
 }
 public Raster computeTile(int x, int y) {
   Raster r1 = source1.getTile(x, y);
   Raster r2 = source2.getTile(x, y);
   int xBounds = r1.getWidth();
   if (r2.getWidth() < xBounds)
     xBounds = r2.getWidth();
   int yBounds = r1.getHeight();
   if (r2.getHeight() < yBounds)
     yBounds = r2.getHeight();
   WritableRaster wr;
   wr = r1.createCompatibleWritableRaster(xBounds, yBounds);
   int tmpi;
   int tmpj;
   for (int i = 0; i < wr.getWidth(); i++)
     for (int j = 0; j < wr.getHeight(); j++) {
       tmpi = i / samplingPeriod;
       tmpj = j / samplingPeriod;
       if ((tmpi % 2 == 0) && (tmpj % 2 == 0))
         wr.setDataElements(i, j, r2.getDataElements(i, j, null));
       else if ((tmpi % 2 != 0) && (tmpj % 2 != 0))
         wr.setDataElements(i, j, r2.getDataElements(i, j, null));
       else
         wr.setDataElements(i, j, r1.getDataElements(i, j, null));
     }
   return wr;
 }
 private RenderedImage source1, source2;
 private int samplingPeriod;

}

      </source>   

Check Alignment RIF

<source lang="java"> import java.awt.image.RenderedImage; import java.awt.image.renderable.ParameterBlock; import java.awt.image.renderable.RenderedImageFactory; import java.awt.RenderingHints; import javax.media.jai.ImageLayout; public class CheckAlignmentRIF implements RenderedImageFactory {

 public CheckAlignmentRIF() {
 }
 public RenderedImage create(ParameterBlock paramBlock,
     RenderingHints renderingHints) {
   RenderedImage source1 = paramBlock.getRenderedSource(0);
   RenderedImage source2 = paramBlock.getRenderedSource(1);
   int samplingPeriod = paramBlock.getIntParameter(0);
   ImageLayout layout = null;
   return new CheckAlignmentOpImage(source1, source2, samplingPeriod,
       layout, renderingHints, false);
 }

}

      </source>   

Lists all allowable JAI operations

<source lang="java"> import javax.media.jai.JAI; import javax.media.jai.OperationRegistry; import javax.media.jai.RegistryMode; public class ListRegistry {

 public ListRegistry() {
   or = JAI.getDefaultInstance().getOperationRegistry();
   String[] modeNames = RegistryMode.getModeNames();
   String[] descriptorNames;
   for (int i = 0; i < modeNames.length; i++) {
     System.out.println("For registry mode: " + modeNames[i]);
     descriptorNames = or.getDescriptorNames(modeNames[i]);
     for (int j = 0; j < descriptorNames.length; j++) {
       System.out.print("\tRegistered Operator: ");
       System.out.println(descriptorNames[j]);
     }
   }
 }
 public static void main(String[] args) {
   new ListRegistry();
 }
 private OperationRegistry or;

}

      </source>