/*
* Geotoolkit.org - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2005-2012, Open Source Geospatial Foundation (OSGeo)
* (C) 2009-2012, Geomatys
*
* 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.geotoolkit.coverage.processing.operation;
import javax.media.jai.operator.ExpDescriptor;
import org.apache.sis.measure.NumberRange;
import org.geotoolkit.coverage.processing.OperationJAI;
/**
* Takes the exponential of the sample values of a coverage.
*
* <P><b>Name:</b> {@code "Exp"}<BR>
* <b>JAI operator:</b> <CODE>"{@linkplain ExpDescriptor Exp}"</CODE><BR>
* <b>Parameters:</b></P>
* <table border='3' cellpadding='6' bgcolor='F4F8FF'>
* <tr bgcolor='#B9DCFF'>
* <th>Name</th>
* <th>Class</th>
* <th>Default value</th>
* <th>Minimum value</th>
* <th>Maximum value</th>
* </tr>
* <tr>
* <td>{@code "Source"}</td>
* <td>{@link org.geotoolkit.coverage.grid.GridCoverage2D}</td>
* <td align="center">N/A</td>
* <td align="center">N/A</td>
* <td align="center">N/A</td>
* </tr>
* </table>
*
* @author Martin Desruisseaux (IRD)
* @version 3.00
*
* @see org.geotoolkit.coverage.processing.Operations#exp
* @see ExpDescriptor
*
* @since 2.2
* @module
*/
public class Exp extends OperationJAI {
/**
* Serial number for inter-operability with different versions.
*/
private static final long serialVersionUID = 6136918309949539525L;
/**
* Constructs a default {@code "Exp"} operation.
*/
public Exp() {
super("Exp");
}
/**
* Returns the expected range of values for the resulting image.
*/
@Override
protected NumberRange<?> deriveRange(final NumberRange<?>[] ranges, final Parameters parameters) {
final NumberRange<?> range = ranges[0];
final double min = Math.exp(range.getMinDouble());
final double max = Math.exp(range.getMaxDouble());
return NumberRange.create(min, true, max, true);
}
}