Application: gvSIG desktop » gvSIG raster

package org.gvsig.raster.lib.buffer.impl;

import java.util.ArrayList;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.raster.lib.buffer.api.Band;

import org.gvsig.raster.lib.buffer.api.Buffer;

import org.gvsig.raster.lib.buffer.api.BufferLocator;

import org.gvsig.raster.lib.buffer.api.BufferManager;

import org.gvsig.raster.lib.buffer.api.exceptions.BandException;

import org.gvsig.raster.lib.buffer.impl.exceptions.CreateBufferException;

/**

 * This is like a view over a raster buffer.

 * It's for rendering purposes only.

 *

 * @author fdiaz

 *

 */

public class ClippedBuffer extends AbstractBuffer implements Buffer {

    protected static final Logger logger = LoggerFactory.getLogger(ClippedBuffer.class);

    Buffer buffer;

    int firstRow;

    int firstColumn;

    /**

     * @param buffer

     * @param envelope

     * @throws CreateBufferException

     */

    public ClippedBuffer(Buffer buffer, Envelope envelope) throws CreateBufferException {

        this.buffer = buffer;

        try {

            this.envelope = buffer.getEnvelope().getGeometry().intersection(envelope.getGeometry()).getEnvelope();

        } catch (GeometryOperationNotSupportedException | GeometryOperationException e1) {

            throw new CreateBufferException(e1);

        }

        this.rows = (int)Math.round(this.envelope.getLength(1)/this.buffer.getPixelSizeY());

        this.columns = (int)Math.round(this.envelope.getLength(0)/this.buffer.getPixelSizeX());

        this.firstRow = (int)(Math.round((this.envelope.getMinimum(1)-this.buffer.getEnvelope().getMinimum(1))/this.buffer.getPixelSizeY()));

        this.firstColumn = (int)(Math.round((this.envelope.getMinimum(0)-this.buffer.getEnvelope().getMinimum(0))/this.buffer.getPixelSizeX()));

        this.projection = buffer.getProjection();

        this.bands = new ArrayList<Band>();

        try {

            createBands(buffer.getBands());

        } catch (Exception e) {

            throw new CreateBufferException(e);

        }

    }

    private void createBands(Band[] bands) throws BandException {

        BufferManager bufferManager = BufferLocator.getBufferManager();

        for (int i = 0; i < bands.length; i++) {

            Band band = bufferManager.createClippedBand(this, bands[i]);

            this.bands.add(band);

            band.addObserver(this);

        }

    }

    protected int getFirstRow(){

        return this.firstRow;

    }

    protected int getFirstColumn(){

        return this.firstColumn;

    }

}