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Java example source code file (InterpolatingMicrosphere2D.java)

This example Java source code file (InterpolatingMicrosphere2D.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

dimension, interpolatingmicrosphere, interpolatingmicrosphere2d, override

The InterpolatingMicrosphere2D.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.util.FastMath;
import org.apache.commons.math3.util.MathUtils;

/**
 * Utility class for the {@link MicrosphereProjectionInterpolator} algorithm.
 * For 2D interpolation, this class constructs the microsphere as a series of
 * evenly spaced facets (rather than generating random normals as in the
 * base implementation).
 *
 * @since 3.6
 */
public class InterpolatingMicrosphere2D extends InterpolatingMicrosphere {
    /** Space dimension. */
    private static final int DIMENSION = 2;

    /**
     * Create a sphere from vectors regularly sampled around a circle.
     *
     * @param size Number of surface elements of the sphere.
     * @param maxDarkFraction Maximum fraction of the facets that can be dark.
     * If the fraction of "non-illuminated" facets is larger, no estimation
     * of the value will be performed, and the {@code background} value will
     * be returned instead.
     * @param darkThreshold Value of the illumination below which a facet is
     * considered dark.
     * @param background Value returned when the {@code maxDarkFraction}
     * threshold is exceeded.
     * @throws org.apache.commons.math3.exception.NotStrictlyPositiveException
     * if {@code size <= 0}.
     * @throws org.apache.commons.math3.exception.NotPositiveException if
     * {@code darkThreshold < 0}.
     * @throws org.apache.commons.math3.exception.OutOfRangeException if
     * {@code maxDarkFraction} does not belong to the interval {@code [0, 1]}.
     */
    public InterpolatingMicrosphere2D(int size,
                                      double maxDarkFraction,
                                      double darkThreshold,
                                      double background) {
        super(DIMENSION, size, maxDarkFraction, darkThreshold, background);

        // Generate the microsphere normals.
        for (int i = 0; i < size; i++) {
            final double angle = i * MathUtils.TWO_PI / size;

            add(new double[] { FastMath.cos(angle),
                               FastMath.sin(angle) },
                false);
        }
    }

    /**
     * Copy constructor.
     *
     * @param other Instance to copy.
     */
    protected InterpolatingMicrosphere2D(InterpolatingMicrosphere2D other) {
        super(other);
    }

    /**
     * Perform a copy.
     *
     * @return a copy of this instance.
     */
    @Override
    public InterpolatingMicrosphere2D copy() {
        return new InterpolatingMicrosphere2D(this);
    }
}

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