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/*******************************************************************************
 * 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 org.mini2Dx.gdx.math.collision;

import java.io.Serializable;

import org.mini2Dx.gdx.math.Vector3;
import org.mini2Dx.gdx.utils.NumberUtils;

/** A Segment is a line in 3-space having a staring and an ending position.
 * 
 * @author mzechner */
public class Segment implements Serializable {
	private static final long serialVersionUID = 2739667069736519602L;

	/** the starting position **/
	public final Vector3 a = new Vector3();

	/** the ending position **/
	public final Vector3 b = new Vector3();

	/** Constructs a new Segment from the two points given.
	 * 
	 * @param a the first point
	 * @param b the second point */
	public Segment (Vector3 a, Vector3 b) {
		this.a.set(a);
		this.b.set(b);
	}

	/** Constructs a new Segment from the two points given.
	 * @param aX the x-coordinate of the first point
	 * @param aY the y-coordinate of the first point
	 * @param aZ the z-coordinate of the first point
	 * @param bX the x-coordinate of the second point
	 * @param bY the y-coordinate of the second point
	 * @param bZ the z-coordinate of the second point */
	public Segment (float aX, float aY, float aZ, float bX, float bY, float bZ) {
		this.a.set(aX, aY, aZ);
		this.b.set(bX, bY, bZ);
	}

	public float len () {
		return a.dst(b);
	}

	public float len2 () {
		return a.dst2(b);
	}

	@Override
	public boolean equals (Object o) {
		if (o == this) return true;
		if (o == null || o.getClass() != this.getClass()) return false;
		Segment s = (Segment)o;
		return this.a.equals(s.a) && this.b.equals(s.b);
	}

	@Override
	public int hashCode () {
		final int prime = 71;
		int result = 1;
		result = prime * result + this.a.hashCode();
		result = prime * result + this.b.hashCode();
		return result;
	}
}