Sphere.java

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed 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 com.badlogic.gdx.math.collision;

import java.io.Serializable;

import com.badlogic.gdx.math.Vector3;

/**
 * Encapsulates a 3D sphere with a center and a radius
 * 
 * @author badlogicgames@gmail.com
 */
public class Sphere implements Serializable {
	private static final long serialVersionUID = -6487336868908521596L;
	/** the radius of the sphere **/
	public float radius;
	/** the center of the sphere **/
	public final Vector3 center;

	/**
	 * Constructs a sphere with the given center and radius
	 * 
	 * @param center
	 *            The center
	 * @param radius
	 *            The radius
	 */
	public Sphere(Vector3 center, float radius) {
		this.center = new Vector3(center);
		this.radius = radius;
	}

	/**
	 * @param sphere
	 *            the other sphere
	 * @return whether this and the other sphere overlap
	 */
	public boolean overlaps(Sphere sphere) {
		return center.dst2(sphere.center) < (radius + sphere.radius) * (radius + sphere.radius);
	}
}