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Java example source code file (EnclosingBall.java)

This example Java source code file (EnclosingBall.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

enclosingball, point, serializable, space

The EnclosingBall.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.enclosing;

import java.io.Serializable;

import org.apache.commons.math3.geometry.Point;
import org.apache.commons.math3.geometry.Space;

/** This class represents a ball enclosing some points.
 * @param <S> Space type.
 * @param <P> Point type.
 * @see Space
 * @see Point
 * @see Encloser
 * @since 3.3
 */
public class EnclosingBall<S extends Space, P extends Point implements Serializable {

    /** Serializable UID. */
    private static final long serialVersionUID = 20140126L;

    /** Center of the ball. */
    private final P center;

    /** Radius of the ball. */
    private final double radius;

    /** Support points used to define the ball. */
    private final P[] support;

    /** Simple constructor.
     * @param center center of the ball
     * @param radius radius of the ball
     * @param support support points used to define the ball
     */
    public EnclosingBall(final P center, final double radius, final P ... support) {
        this.center  = center;
        this.radius  = radius;
        this.support = support.clone();
    }

    /** Get the center of the ball.
     * @return center of the ball
     */
    public P getCenter() {
        return center;
    }

    /** Get the radius of the ball.
     * @return radius of the ball (can be negative if the ball is empty)
     */
    public double getRadius() {
        return radius;
    }

    /** Get the support points used to define the ball.
     * @return support points used to define the ball
     */
    public P[] getSupport() {
        return support.clone();
    }

    /** Get the number of support points used to define the ball.
     * @return number of support points used to define the ball
     */
    public int getSupportSize() {
        return support.length;
    }

    /** Check if a point is within the ball or at boundary.
     * @param point point to test
     * @return true if the point is within the ball or at boundary
     */
    public boolean contains(final P point) {
        return point.distance(center) <= radius;
    }

    /** Check if a point is within an enlarged ball or at boundary.
     * @param point point to test
     * @param margin margin to consider
     * @return true if the point is within the ball enlarged
     * by the margin or at boundary
     */
    public boolean contains(final P point, final double margin) {
        return point.distance(center) <= radius + margin;
    }

}

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