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Java example source code file (MicrosphereInterpolator.java)

This example Java source code file (MicrosphereInterpolator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

default_brightness_exponent, default_microsphere_elements, deprecated, dimensionmismatchexception, microsphereinterpolatingfunction, microsphereinterpolator, multivariatefunction, multivariateinterpolator, nodataexception, notpositiveexception, notstrictlypositiveexception, nullargumentexception, unitsphererandomvectorgenerator

The MicrosphereInterpolator.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.analysis.interpolation;

import org.apache.commons.math3.analysis.MultivariateFunction;
import org.apache.commons.math3.exception.NotPositiveException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.apache.commons.math3.exception.NoDataException;
import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.NullArgumentException;
import org.apache.commons.math3.random.UnitSphereRandomVectorGenerator;

/**
 * Interpolator that implements the algorithm described in
 * <em>William Dudziak's
 * <a href="http://www.dudziak.com/microsphere.pdf">MS thesis.
 *
 * @since 2.1
 * @deprecated Code will be removed in 4.0.  Use {@link InterpolatingMicrosphere}
 * and {@link MicrosphereProjectionInterpolator} instead.
 */
@Deprecated
public class MicrosphereInterpolator
    implements MultivariateInterpolator {
    /**
     * Default number of surface elements that composes the microsphere.
     */
    public static final int DEFAULT_MICROSPHERE_ELEMENTS = 2000;
    /**
     * Default exponent used the weights calculation.
     */
    public static final int DEFAULT_BRIGHTNESS_EXPONENT = 2;
    /**
     * Number of surface elements of the microsphere.
     */
    private final int microsphereElements;
    /**
     * Exponent used in the power law that computes the weights of the
     * sample data.
     */
    private final int brightnessExponent;

    /**
     * Create a microsphere interpolator with default settings.
     * Calling this constructor is equivalent to call {@link
     * #MicrosphereInterpolator(int, int)
     * MicrosphereInterpolator(MicrosphereInterpolator.DEFAULT_MICROSPHERE_ELEMENTS,
     * MicrosphereInterpolator.DEFAULT_BRIGHTNESS_EXPONENT)}.
     */
    public MicrosphereInterpolator() {
        this(DEFAULT_MICROSPHERE_ELEMENTS, DEFAULT_BRIGHTNESS_EXPONENT);
    }

    /** Create a microsphere interpolator.
     * @param elements Number of surface elements of the microsphere.
     * @param exponent Exponent used in the power law that computes the
     * weights (distance dimming factor) of the sample data.
     * @throws NotPositiveException if {@code exponent < 0}.
     * @throws NotStrictlyPositiveException if {@code elements <= 0}.
     */
    public MicrosphereInterpolator(final int elements,
                                   final int exponent)
        throws NotPositiveException,
               NotStrictlyPositiveException {
        if (exponent < 0) {
            throw new NotPositiveException(exponent);
        }
        if (elements <= 0) {
            throw new NotStrictlyPositiveException(elements);
        }

        microsphereElements = elements;
        brightnessExponent = exponent;
    }

    /**
     * {@inheritDoc}
     */
    public MultivariateFunction interpolate(final double[][] xval,
                                            final double[] yval)
        throws DimensionMismatchException,
               NoDataException,
               NullArgumentException {
        final UnitSphereRandomVectorGenerator rand
            = new UnitSphereRandomVectorGenerator(xval[0].length);
        return new MicrosphereInterpolatingFunction(xval, yval,
                                                    brightnessExponent,
                                                    microsphereElements,
                                                    rand);
    }
}

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