/*******************************************************************************
* 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.MathUtils;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.utils.NumberUtils;
/** 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;
private static final float PI_4_3 = MathUtils.PI * 4f / 3f;
/** 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);
}
@Override
public int hashCode () {
final int prime = 71;
int result = 1;
result = prime * result + this.center.hashCode();
result = prime * result + NumberUtils.floatToRawIntBits(this.radius);
return result;
}
@Override
public boolean equals (Object o) {
if (this == o) return true;
if (o == null || o.getClass() != this.getClass()) return false;
Sphere s = (Sphere)o;
return this.radius == s.radius && this.center.equals(s.center);
}
public float volume () {
return PI_4_3 * this.radius * this.radius * this.radius;
}
public float surfaceArea () {
return 4 * MathUtils.PI * this.radius * this.radius;
}
}