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Java example source code file (SubCircle.java)

This example Java source code file (SubCircle.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractsubhyperplane, arcsset, circle, hyperplane, override, region, sphere1d, splitsubhyperplane, subcircle

The SubCircle.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.geometry.spherical.twod;

import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;
import org.apache.commons.math3.geometry.partitioning.AbstractSubHyperplane;
import org.apache.commons.math3.geometry.partitioning.Hyperplane;
import org.apache.commons.math3.geometry.partitioning.Region;
import org.apache.commons.math3.geometry.spherical.oned.Arc;
import org.apache.commons.math3.geometry.spherical.oned.ArcsSet;
import org.apache.commons.math3.geometry.spherical.oned.Sphere1D;
import org.apache.commons.math3.util.FastMath;

/** This class represents a sub-hyperplane for {@link Circle}.
 * @since 3.3
 */
public class SubCircle extends AbstractSubHyperplane<Sphere2D, Sphere1D> {

    /** Simple constructor.
     * @param hyperplane underlying hyperplane
     * @param remainingRegion remaining region of the hyperplane
     */
    public SubCircle(final Hyperplane<Sphere2D> hyperplane,
                     final Region<Sphere1D> remainingRegion) {
        super(hyperplane, remainingRegion);
    }

    /** {@inheritDoc} */
    @Override
    protected AbstractSubHyperplane<Sphere2D, Sphere1D> buildNew(final Hyperplane hyperplane,
                                                                 final Region<Sphere1D> remainingRegion) {
        return new SubCircle(hyperplane, remainingRegion);
    }

    /** {@inheritDoc} */
    @Override
    public SplitSubHyperplane<Sphere2D> split(final Hyperplane hyperplane) {

        final Circle thisCircle   = (Circle) getHyperplane();
        final Circle otherCircle  = (Circle) hyperplane;
        final double angle = Vector3D.angle(thisCircle.getPole(), otherCircle.getPole());

        if (angle < thisCircle.getTolerance() || angle > FastMath.PI - thisCircle.getTolerance()) {
            // the two circles are aligned or opposite
            return new SplitSubHyperplane<Sphere2D>(null, null);
        } else {
            // the two circles intersect each other
            final Arc    arc          = thisCircle.getInsideArc(otherCircle);
            final ArcsSet.Split split = ((ArcsSet) getRemainingRegion()).split(arc);
            final ArcsSet plus        = split.getPlus();
            final ArcsSet minus       = split.getMinus();
            return new SplitSubHyperplane<Sphere2D>(plus  == null ? null : new SubCircle(thisCircle.copySelf(), plus),
                                                    minus == null ? null : new SubCircle(thisCircle.copySelf(), minus));
        }

    }

}

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