lwjgl2-arm64/src/java/org/lwjgl/vector/Vector.java

/* 
 * Copyright (c) 2002 Lightweight Java Game Library Project
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 * * Redistributions of source code must retain the above copyright 
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'Lightweight Java Game Library' nor the names of 
 *   its contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.lwjgl.vector;

import java.io.Serializable;
import java.nio.FloatBuffer;

/**
 * $Id$
 *
 * Base class for vectors.
 *
 * @author cix_foo <cix_foo@users.sourceforge.net>
 * @version $Revision$
 */
public abstract class Vector implements Serializable, ReadableVector {

	/**
	 * Constructor for Vector.
	 */
	public Vector() {
		super();
	}

	/**
	 * @return the length of the vector
	 */
	public final float length() {
		return (float) Math.sqrt(lengthSquared());
	}
	

	/**
	 * @return the length squared of the vector
	 */
	public abstract float lengthSquared();
	
    /**
     * Load this vector from a FloatBuffer
     * @param buf The buffer to load it from, at the current position
     * @return this
     */
    public abstract Vector load(FloatBuffer buf);	

	/**
	 * Negate a vector
	 * @return this
	 */
	public abstract Vector negate();
	

	/**
	 * Normalise this vector
	 * @return this
	 */
	public final Vector normalise() {
		float len = length();
		if (len != 0.0f) {
			float l = 1.0f / len;
			return scale(l);
		} else {
			assert false;
			return this;
		}
	}
	

    /**
     * Store this vector in a FloatBuffer
     * @param buf The buffer to store it in, at the current position
     * @return this
     */
    public abstract Vector store(FloatBuffer buf);    


    /**
     * Scale this vector
     * @param scale The scale factor
     * @return this
     */
    public abstract Vector scale(float scale);    



}