291 lines
6.4 KiB
Java
291 lines
6.4 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.util.vector;
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import java.io.Serializable;
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import java.nio.FloatBuffer;
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/**
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*
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* Holds a 2-tuple vector.
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*
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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public class Vector2f extends Vector implements Serializable, ReadableVector2f, WritableVector2f {
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private static final long serialVersionUID = 1L;
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public float x, y;
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/**
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* Constructor for Vector3f.
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*/
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public Vector2f() {
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super();
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}
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/**
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* Constructor
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*/
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public Vector2f(ReadableVector2f src) {
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set(src);
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}
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/**
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* Constructor
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*/
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public Vector2f(float x, float y) {
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set(x, y);
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}
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/* (non-Javadoc)
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* @see org.lwjgl.util.vector.WritableVector2f#set(float, float)
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*/
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public void set(float x, float y) {
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this.x = x;
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this.y = y;
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}
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/**
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* Load from another Vector2f
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* @param src The source vector
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* @return this
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*/
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public Vector2f set(ReadableVector2f src) {
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x = src.getX();
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y = src.getY();
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return this;
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}
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/**
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* @return the length squared of the vector
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*/
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public float lengthSquared() {
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return x * x + y * y;
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}
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/**
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* Translate a vector
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* @param x The translation in x
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* @param y the translation in y
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* @return this
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*/
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public Vector2f translate(float x, float y) {
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this.x += x;
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this.y += y;
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return this;
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}
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/**
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* Negate a vector
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* @return this
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*/
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public Vector negate() {
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x = -x;
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y = -y;
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return this;
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}
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/**
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* Negate a vector and place the result in a destination vector.
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* @param dest The destination vector or null if a new vector is to be created
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* @return the negated vector
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*/
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public Vector2f negate(Vector2f dest) {
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if (dest == null)
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dest = new Vector2f();
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dest.x = -x;
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dest.y = -y;
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return dest;
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}
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/**
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* Normalise this vector and place the result in another vector.
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* @param dest The destination vector, or null if a new vector is to be created
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* @return the normalised vector
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*/
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public Vector2f normalise(Vector2f dest) {
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float l = length();
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if (dest == null)
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dest = new Vector2f(x / l, y / l);
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else
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dest.set(x / l, y / l);
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return dest;
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}
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/**
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* The dot product of two vectors is calculated as
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* v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
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* @param left The LHS vector
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* @param right The RHS vector
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* @return left dot right
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*/
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public static float dot(Vector2f left, Vector2f right) {
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return left.x * right.x + left.y * right.y;
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}
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/**
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* Calculate the angle between two vectors, in radians
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* @param a A vector
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* @param b The other vector
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* @return the angle between the two vectors, in radians
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*/
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public static float angle(Vector2f a, Vector2f b) {
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float dls = dot(a, b) / (a.length() * b.length());
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if (dls < -1f)
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dls = -1f;
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else if (dls > 1.0f)
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dls = 1.0f;
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return (float)Math.acos(dls);
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}
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/**
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* Add a vector to another vector and place the result in a destination
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* vector.
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* @param left The LHS vector
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* @param right The RHS vector
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* @param dest The destination vector, or null if a new vector is to be created
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* @return the sum of left and right in dest
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*/
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public static Vector2f add(Vector2f left, Vector2f right, Vector2f dest) {
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if (dest == null)
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return new Vector2f(left.x + right.x, left.y + right.y);
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else {
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dest.set(left.x + right.x, left.y + right.y);
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return dest;
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}
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}
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/**
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* Subtract a vector from another vector and place the result in a destination
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* vector.
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* @param left The LHS vector
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* @param right The RHS vector
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* @param dest The destination vector, or null if a new vector is to be created
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* @return left minus right in dest
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*/
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public static Vector2f sub(Vector2f left, Vector2f right, Vector2f dest) {
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if (dest == null)
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return new Vector2f(left.x - right.x, left.y - right.y);
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else {
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dest.set(left.x - right.x, left.y - right.y);
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return dest;
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}
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}
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/**
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* Store this vector in a FloatBuffer
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* @param buf The buffer to store it in, at the current position
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* @return this
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*/
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public Vector store(FloatBuffer buf) {
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buf.put(x);
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buf.put(y);
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return this;
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}
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/**
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* Load this vector from a FloatBuffer
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* @param buf The buffer to load it from, at the current position
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* @return this
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*/
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public Vector load(FloatBuffer buf) {
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x = buf.get();
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y = buf.get();
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return this;
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}
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/* (non-Javadoc)
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* @see org.lwjgl.vector.Vector#scale(float)
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*/
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public Vector scale(float scale) {
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x *= scale;
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y *= scale;
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return this;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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StringBuilder sb = new StringBuilder(64);
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sb.append("Vector2f[");
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sb.append(x);
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sb.append(", ");
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sb.append(y);
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sb.append(']');
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return sb.toString();
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}
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/**
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* @return x
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*/
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public final float getX() {
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return x;
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}
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/**
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* @return y
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*/
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public final float getY() {
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return y;
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}
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/**
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* Set X
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* @param x
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*/
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public final void setX(float x) {
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this.x = x;
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}
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/**
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* Set Y
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* @param y
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*/
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public final void setY(float y) {
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this.y = y;
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}
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}
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