import java.util.Hashtable;

import cds.aladin.*;

public class CalibrationPlug extends AladinPlugin {
   
   public String menu() { return "Image calibration shift"; }
   public String description()   {
      return "PLUGIN TUTORIAL:\n" +
             "This plugin is an example for manipulating the image calibration.\n" +
             "It will apply a shift on the current astrometrical solution.";
   }   
   public String author()        { return "Pierre Fernique [CDS]"; }
   public String version()       { return "1.1 - January 2007"; }
   public String url() { return "http://aladin.u-strasbg.fr/java/Plugins/CalibrationPlug.java"; }
   public String category()      { return "Plugin tutorial/Image"; }
   
   /**
    * 1) Retrieve the AladinData object corresponding to the default image
    * 2) Get the Aladin internal reference to the fits keys associated to this image,
    *    and notably the WCS keys
    * 3) Modify the WCS CRPIX1 and CRPIX2 values
    * 4) Notify Aladin that the fits key has been modified
    */
   public void exec() {
      try {
         AladinData ad = aladin.getAladinImage();
         
         Hashtable header = ad.seeFitsKeys();
         double crpix1 = Double.parseDouble( (String)header.get("CRPIX1") );
         double crpix2 = Double.parseDouble( (String)header.get("CRPIX2") );
         header.put("CRPIX1",(100+crpix1)+"");
         header.put("CRPIX2",(100+crpix2)+"");
         ad.fitsKeysModified();
         
      } catch( Exception e ) { aladin.warning("Plugin error: "+e.getMessage()); }
   } 
}