/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2005-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.coverage.processing;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Rectangle2D;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
import javax.media.jai.JAI;
import javax.media.jai.OperationDescriptor;
import javax.media.jai.ParameterBlockJAI;
import javax.media.jai.ROIShape;
import javax.media.jai.StatisticsOpImage;
import javax.media.jai.registry.RenderedRegistryMode;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridGeometry2D;
import org.geotools.geometry.DirectPosition2D;
import org.geotools.geometry.Envelope2D;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.metadata.iso.citation.Citations;
import org.geotools.parameter.DefaultParameterDescriptor;
import org.geotools.parameter.ImagingParameterDescriptors;
import org.geotools.parameter.ImagingParameters;
import org.geotools.referencing.CRS;
import org.geotools.referencing.operation.transform.ProjectiveTransform;
import org.geotools.util.logging.Logging;
import org.opengis.metadata.spatial.PixelOrientation;
import org.opengis.parameter.ParameterDescriptor;
import org.opengis.parameter.ParameterValueGroup;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.Polygon;
/**
* This class is the root class for the Statistics operations based on
* {@link JAI}'s {@link StatisticsOpImage} like Extrema and Histogram. It
* provides basic capabilities for management of geospatial parameters like
* {@link javax.media.jai.ROI}s and subsampling factors.
*
* @author Simone Giannecchini
* @since 2.4.x
*
*
*
*
* @source $URL$
*/
public abstract class BaseStatisticsOperationJAI extends
OperationJAI {
/**
*
*/
private static final long serialVersionUID = 6830028735162290160L;
/** {@link Logger} for this class. */
public final static Logger LOGGER = Logging.getLogger("org.geotools.coverage.processing");
/**
* The parameter descriptor for the SPATIAL_SUBSAMPLING_X
*/
public static final ParameterDescriptor<Double> SPATIAL_SUBSAMPLING_X = new DefaultParameterDescriptor<Double>(
Citations.JAI, "xPeriod", Double.class, // Value class (mandatory)
null, // Array of valid values
null, // Default value
null, // Minimal value
null, // Maximal value
null, // Unit of measure
true);
/**
* The parameter descriptor for the SPATIAL_SUBSAMPLING_Y
*/
public static final ParameterDescriptor<Double> SPATIAL_SUBSAMPLING_Y = new DefaultParameterDescriptor<Double>(
Citations.JAI, "yPeriod", Double.class, // Value class (mandatory)
null, // Array of valid values
null, // Default value
null, // Minimal value
null, // Maximal value
null, // Unit of measure
true);
/**
* The parameter descriptor for the Region Of Interest.
*/
public static final ParameterDescriptor<Polygon> ROI = new DefaultParameterDescriptor<Polygon>(
Citations.JAI, "roi", Polygon.class, // Value class (mandatory)
null, // Array of valid values
null, // Default value
null, // Minimal value
null, // Maximal value
null, // Unit of measure
true);
private static Set<ParameterDescriptor> REPLACED_DESCRIPTORS;
static {
final Set<ParameterDescriptor> replacedDescriptors = new HashSet<ParameterDescriptor>();
replacedDescriptors.add( SPATIAL_SUBSAMPLING_X);
replacedDescriptors.add( SPATIAL_SUBSAMPLING_Y);
replacedDescriptors.add( ROI);
REPLACED_DESCRIPTORS = Collections.unmodifiableSet(replacedDescriptors);
}
/**
* Constructor for {@link BaseStatisticsOperationJAI}.
*
* @param operationDescriptor
* {@link OperationDescriptor} for the underlying JAI operation.
*/
public BaseStatisticsOperationJAI(OperationDescriptor operationDescriptor) {
super(operationDescriptor, new ImagingParameterDescriptors(
getOperationDescriptor(operationDescriptor.getName()),
REPLACED_DESCRIPTORS));
}
/**
* Constructor for {@link BaseStatisticsOperationJAI}.
*
* @param operationDescriptor
* {@link OperationDescriptor} for the underlying JAI operation.
* @param replacements
* {@link ImagingParameterDescriptors} that should replace the
* correspondent {@link ImagingParameters} in order to change the
* default behavior they have inside JAI.
*/
public BaseStatisticsOperationJAI(
OperationDescriptor operationDescriptor,
ImagingParameterDescriptors replacements) {
super(operationDescriptor, new ImagingParameterDescriptors(
ImagingParameterDescriptors.properties(operationDescriptor),
operationDescriptor, RenderedRegistryMode.MODE_NAME,
ImagingParameterDescriptors.DEFAULT_SOURCE_TYPE_MAP, REPLACED_DESCRIPTORS));
}
/**
* Constructor for {@link BaseStatisticsOperationJAI}.
* @param name of the underlying JAI operation.
*/
public BaseStatisticsOperationJAI(String name) {
super(getOperationDescriptor(name),new ImagingParameterDescriptors(
getOperationDescriptor(name),
new HashSet<ParameterDescriptor>(REPLACED_DESCRIPTORS)));
}
/**
* Copies parameter values from the specified {@link ParameterValueGroup} to the
* {@link ParameterBlockJAI}
*
* @param parameters
* The {@link ParameterValueGroup} to be copied.
* @return A copy of the provided {@link ParameterValueGroup} as a JAI block.
*
* @see org.geotools.coverage.processing.OperationJAI#prepareParameters(org.opengis.parameter.ParameterValueGroup)
*/
protected ParameterBlockJAI prepareParameters(ParameterValueGroup parameters) {
// /////////////////////////////////////////////////////////////////////
//
// Make a copy of the input parameters.
//
// ///////////////////////////////////////////////////////////////////
final ImagingParameters copy = (ImagingParameters) descriptor
.createValue();
final ParameterBlockJAI block = (ParameterBlockJAI) copy.parameters;
try {
// /////////////////////////////////////////////////////////////////////
//
//
// Now transcode the parameters as needed by this operation.
//
//
// ///////////////////////////////////////////////////////////////////
// XXX make it robust
final GridCoverage2D source = (GridCoverage2D) parameters
.parameter(operation.getSourceNames()[PRIMARY_SOURCE_INDEX])
.getValue();
final AffineTransform gridToWorldTransformCorrected = new AffineTransform(
(AffineTransform) ((GridGeometry2D) source
.getGridGeometry())
.getGridToCRS2D(PixelOrientation.UPPER_LEFT));
final MathTransform worldToGridTransform;
try {
worldToGridTransform = ProjectiveTransform
.create(gridToWorldTransformCorrected.createInverse());
} catch (NoninvertibleTransformException e) {
// //
//
// Something bad happened here, namely the transformation to go
// from grid to world was not invertible. Let's wrap and
// propagate the error.
//
// //
final CoverageProcessingException ce = new CoverageProcessingException(
e);
throw ce;
}
// //
//
// get the original envelope and the crs
//
// //
final CoordinateReferenceSystem crs = source
.getCoordinateReferenceSystem2D();
final Envelope2D envelope = source.getEnvelope2D();
// /////////////////////////////////////////////////////////////////////
//
// Transcode the xPeriod and yPeriod parameters by applying the
// WorldToGrid transformation for the source coverage.
//
// I am assuming that the supplied values are in the same CRS as the
// source coverage. We here apply
//
// /////////////////////////////////////////////////////////////////////
final double xPeriod = parameters.parameter("xPeriod")
.doubleValue();
final double yPeriod = parameters.parameter("yPeriod")
.doubleValue();
if(!Double.isNaN(xPeriod)&&!Double.isNaN(yPeriod)){
// build the new one that spans over the requested area
// NOTE:
final DirectPosition2D LLC = new DirectPosition2D(crs, envelope.x,
envelope.y);
LLC.setCoordinateReferenceSystem(crs);
final DirectPosition2D URC = new DirectPosition2D(crs, envelope.x
+ xPeriod, envelope.y + yPeriod);
URC.setCoordinateReferenceSystem(crs);
final Envelope2D shrinkedEnvelope = new Envelope2D(LLC, URC);
// transform back into raster space
final Rectangle2D transformedEnv = CRS.transform(
worldToGridTransform, shrinkedEnvelope).toRectangle2D();
// block settings
block.setParameter("xPeriod", Integer.valueOf((int) transformedEnv
.getWidth()));
block.setParameter("yPeriod", Integer.valueOf((int) transformedEnv
.getHeight()));
}
// /////////////////////////////////////////////////////////////////////
//
// Transcode the polygon parameter into a roi.
//
// I am assuming that the supplied values are in the same
// CRS as the source coverage. We here apply
//
// /////////////////////////////////////////////////////////////////////
final Object o = parameters.parameter("roi").getValue();
if (o != null && o instanceof Polygon) {
final Polygon roiInput = (Polygon) o;
if (new ReferencedEnvelope(roiInput.getEnvelopeInternal(),
source.getCoordinateReferenceSystem2D())
.intersects((Envelope) new ReferencedEnvelope(envelope))) {
final java.awt.Polygon shapePolygon = convertPolygon(
roiInput, worldToGridTransform);
block.setParameter("roi", new ROIShape(shapePolygon));
}
}
return block;
} catch (Exception e) {
// //
//
// Something bad happened here Let's wrap and propagate the error.
//
// //
final CoverageProcessingException ce = new CoverageProcessingException(
e);
throw ce;
}
}
/**
* Converte a JTS {@link Polygon}, which represents a ROI, into an AWT
* {@link java.awt.Polygon} by means of the provided {@link MathTransform}.
*
* @param roiInput
* the input ROI as a JTS {@link Polygon}.
* @param worldToGridTransform
* the {@link MathTransform} to apply to the input ROI.
* @return an AWT {@link java.awt.Polygon}.
* @throws TransformException
* in case the provided {@link MathTransform} chokes.
*/
private static java.awt.Polygon convertPolygon(final Polygon roiInput,
MathTransform worldToGridTransform) throws TransformException {
final boolean isIdentity = worldToGridTransform.isIdentity();
final java.awt.Polygon retValue = new java.awt.Polygon();
final double coords[] = new double[2];
final LineString exteriorRing = roiInput.getExteriorRing();
final CoordinateSequence exteriorRingCS = exteriorRing
.getCoordinateSequence();
final int numCoords = exteriorRingCS.size();
for (int i = 0; i < numCoords; i++) {
// get the actual coord
coords[0] = exteriorRingCS.getX(i);
coords[1] = exteriorRingCS.getY(i);
// transform it
if (!isIdentity)
worldToGridTransform.transform(coords, 0, coords, 0, 1);
// send it back to the returned polygon
retValue.addPoint((int) (coords[0] + 0.5d),
(int) (coords[1] + 0.5d));
}
// return the created polygon.
return retValue;
}
}