Application: gvSIG desktop

import java.awt.geom.Rectangle2D;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStreamReader;

import javax.swing.JFileChooser;

import org.gvsig.fmap.raster.layers.FLyrRasterSE;

import org.gvsig.raster.datastruct.Extent;

import com.iver.cit.gvsig.addlayer.fileopen.FileOpenWizard;

import com.iver.cit.gvsig.fmap.ViewPort;

		//Cargar la georreferenciaci?n desde tfw

		if(e.getSource() == panel.getTfwLoad()) {

			JFileChooser chooser = new JFileChooser(FileOpenWizard.getLastPath());

			chooser.setDialogTitle(PluginServices.getText(this, "seleccionar_fichero"));

			chooser.addChoosableFileFilter(new GeorreferencingFileFilter("tfw"));

			chooser.addChoosableFileFilter(new GeorreferencingFileFilter("wld"));

			int returnVal = chooser.showOpenDialog(panel);

			if (returnVal == JFileChooser.APPROVE_OPTION) {

				String fName = chooser.getSelectedFile().toString();

				at = readTfw(fName);

			}

		}

		//Centrar el raster en la vista

		if(e.getSource() == panel.getCenterToView()) {

			Extent extentView = calcCenterExtent(panel.getViewPort());

			double x = extentView.minX();

			double y = extentView.maxY();

			double psX = extentView.width() / ((FLyrRasterSE)panel.getLayer()).getPxWidth();

			double psY = -(extentView.height() / ((FLyrRasterSE)panel.getLayer()).getPxHeight());

			at = new AffineTransform(psX, 0, 0, psY, x, y);

			panel.setModify(true);

		}

	/**

	 * Centra el raster asociado a la capa en al extent del viewport pasado 

	 * por par?metro. 

	 * @param vp ViewPort

	 * @return	Extent para la imagen

	 */

	private Extent calcCenterExtent(ViewPort vp) {

		Extent tempExtent = null;

		double widthPxImg, heightPxImg;

		widthPxImg = ((FLyrRasterSE)panel.getLayer()).getPxWidth();

		heightPxImg = ((FLyrRasterSE)panel.getLayer()).getPxHeight();

		if(vp == null || vp.getAdjustedExtent() == null) {

			vp = new ViewPort(null);

			Rectangle2D r2d = new Rectangle2D.Double(0, 0, widthPxImg, heightPxImg);

			vp.setExtent(r2d);

			tempExtent = new Extent(0, 0, widthPxImg, heightPxImg);

		} else

			tempExtent = new Extent(vp.getAdjustedExtent());

		double ulX = 0D, ulY = 0D, lrX = 0D, lrY = 0D;

		if(widthPxImg > heightPxImg) {

			double widthView = tempExtent.maxX() - tempExtent.minX();

			ulX = tempExtent.minX() + (widthView / 4);

			lrX = ulX + (widthView / 2);

			double newAlto = ((heightPxImg * (widthView / 2)) / widthPxImg);

			double centroY = tempExtent.minY()+((tempExtent.maxY() - tempExtent.minY())/2);

			ulY = centroY - (newAlto / 2);

			lrY = centroY + (newAlto / 2);

		} else {

			double heightView = tempExtent.maxY() - tempExtent.minY();

			ulY = tempExtent.minY() + (heightView / 4);

			lrY = ulY + (heightView / 2);

			double newAncho = ((widthPxImg * (heightView / 2)) / heightPxImg);

			double centroX = tempExtent.minX()+((tempExtent.maxX() - tempExtent.minX())/2);

			ulX = centroX - (newAncho / 2);

			lrX = centroX + (newAncho / 2);

		}

		return new Extent(ulX, ulY, lrX, lrY);

	}

	/**

	 * Lee las coordenadas de un fichero de tfw con una transformaci?n y 

	 * devuelve la clase AffineTransform con dicha transformaci?n. Esta llamada gestiona los

	 * errores producidos actuando en consecuencia. Muestra los mensajes al usuario y retorna

	 * null en caso de tener problemas.

	 * @param fName Nombre del fichero tfw

	 * @return AffineTransform

	 */

	private AffineTransform readTfw(String fName) {

		BufferedReader inGrf = null;

		double[] result = new double[6];

		try {

			inGrf = new BufferedReader(new InputStreamReader(new FileInputStream(fName)));

			String str = inGrf.readLine();

			int count = 0;

			while(str != null && count < 6) {

				try {

					Double value =  new Double(str);

					result[count] = value.doubleValue();

				} catch (NumberFormatException ex) {

					RasterToolsUtil.messageBoxError(PluginServices.getText(this, "error_file_not_valid"), panel, ex);

					return null;

				}

				str = inGrf.readLine();

				count ++;

			}

		} catch (FileNotFoundException e) {

			RasterToolsUtil.messageBoxError(PluginServices.getText(this, "error_file_not_found"), panel, e);

			return null;

		} catch (IOException ex) {

			RasterToolsUtil.messageBoxError(PluginServices.getText(this, "error_lectura"), panel, ex);

			return null;

		}

		return new AffineTransform(result[0], result[1], result[2], result[3], result[4], result[5]);

	}

	/**

	 * Filtro para el selector de formatos de georreferenciaci?n

	 * @author Nacho Brodin (nachobrodin@gmail.com)

	 */

	class GeorreferencingFileFilter extends javax.swing.filechooser.FileFilter {

		private String				filter;

		public GeorreferencingFileFilter(String fil) {

			this.filter = fil;

		}

		public boolean accept(File f) {

			return f.isDirectory() || f.getName().toLowerCase().endsWith("." + filter);

		}

		public String getDescription() {

			return "." + filter;

		}

	}