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A 2D java physics engine, a port of the C++ Box2d engine. This is the core physics engine.
/*******************************************************************************
* Copyright (c) 2011, Daniel Murphy
* 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.
*
* 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 HOLDER 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 LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
/*
* JBox2D - A Java Port of Erin Catto's Box2D
*
* JBox2D homepage: http://jbox2d.sourceforge.net/
* Box2D homepage: http://www.box2d.org
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
package org.jbox2d.common;
import java.io.Serializable;
// updated to rev 100
/**
* A 2D column vector
*/
public class Vec2 implements Serializable {
private static final long serialVersionUID = 1L;
public float x, y;
public Vec2() {
this(0, 0);
}
public Vec2(float x, float y) {
this.x = x;
this.y = y;
}
public Vec2( Vec2 toCopy) {
this(toCopy.x, toCopy.y);
}
/** Zero out this vector. */
public final void setZero() {
x = 0.0f;
y = 0.0f;
}
/** Set the vector component-wise. */
public final Vec2 set(float x, float y) {
this.x = x;
this.y = y;
return this;
}
/** Set this vector to another vector. */
public final Vec2 set(Vec2 v) {
this.x = v.x;
this.y = v.y;
return this;
}
/** Return the sum of this vector and another; does not alter either one. */
public final Vec2 add(Vec2 v) {
return new Vec2(x + v.x, y + v.y);
}
/** Return the difference of this vector and another; does not alter either one. */
public final Vec2 sub(Vec2 v) {
return new Vec2(x - v.x, y - v.y);
}
/** Return this vector multiplied by a scalar; does not alter this vector. */
public final Vec2 mul(float a) {
return new Vec2(x * a, y * a);
}
/** Return the negation of this vector; does not alter this vector. */
public final Vec2 negate() {
return new Vec2(-x, -y);
}
/** Flip the vector and return it - alters this vector. */
public final Vec2 negateLocal() {
x = -x;
y = -y;
return this;
}
/** Add another vector to this one and returns result - alters this vector. */
public final Vec2 addLocal(Vec2 v) {
x += v.x;
y += v.y;
return this;
}
/** Adds values to this vector and returns result - alters this vector. */
public final Vec2 addLocal( float x, float y) {
this.x+=x;
this.y+=y;
return this;
}
/** Subtract another vector from this one and return result - alters this vector. */
public final Vec2 subLocal(Vec2 v) {
x -= v.x;
y -= v.y;
return this;
}
/** Multiply this vector by a number and return result - alters this vector. */
public final Vec2 mulLocal(float a) {
x *= a;
y *= a;
return this;
}
/** Return the length of this vector. */
public final float length() {
return MathUtils.sqrt(x * x + y * y);
}
/** Return the squared length of this vector. */
public final float lengthSquared() {
return (x*x + y*y);
}
/** Normalize this vector and return the length before normalization. Alters this vector. */
public final float normalize() {
float length = length();
if (length < Settings.EPSILON) {
return 0f;
}
float invLength = 1.0f / length;
x *= invLength;
y *= invLength;
return length;
}
/** True if the vector represents a pair of valid, non-infinite floating point numbers. */
public final boolean isValid() {
return x != Float.NaN && x != Float.NEGATIVE_INFINITY
&& x != Float.POSITIVE_INFINITY && y != Float.NaN
&& y != Float.NEGATIVE_INFINITY && y != Float.POSITIVE_INFINITY;
}
/** Return a new vector that has positive components. */
public final Vec2 abs() {
return new Vec2(MathUtils.abs(x), MathUtils.abs(y));
}
/* djm created */
public final void absLocal(){
x = MathUtils.abs(x);
y = MathUtils.abs(y);
}
@Override
/** Return a copy of this vector. */
public final Vec2 clone() {
return new Vec2(x, y);
}
@Override
public final String toString() {
return "(" + x + "," + y + ")";
}
/*
* Static
*/
public final static Vec2 abs(Vec2 a) {
return new Vec2(MathUtils.abs(a.x), MathUtils.abs(a.y));
}
/* djm created */
public final static void absToOut(Vec2 a, Vec2 out){
out.x = MathUtils.abs( a.x);
out.y = MathUtils.abs( a.y);
}
public final static float dot(Vec2 a, Vec2 b) {
return a.x * b.x + a.y * b.y;
}
public final static float cross(Vec2 a, Vec2 b) {
return a.x * b.y - a.y * b.x;
}
public final static Vec2 cross(Vec2 a, float s) {
return new Vec2(s * a.y, -s * a.x);
}
/* djm created */
public final static void crossToOut(Vec2 a, float s, Vec2 out){
float tempy = -s * a.x;
out.x = s * a.y;
out.y = tempy;
}
public final static Vec2 cross(float s, Vec2 a) {
return new Vec2(-s * a.y, s * a.x);
}
/* djm created */
public final static void crossToOut(float s, Vec2 a, Vec2 out){
float tempY = s * a.x;
out.x = -s * a.y;
out.y = tempY;
}
public final static void negateToOut(Vec2 a, Vec2 out){
out.x = -a.x;
out.y = -a.y;
}
public final static Vec2 min(Vec2 a, Vec2 b) {
return new Vec2(a.x < b.x ? a.x : b.x, a.y < b.y ? a.y : b.y);
}
public final static Vec2 max(Vec2 a, Vec2 b) {
return new Vec2(a.x > b.x ? a.x : b.x, a.y > b.y ? a.y : b.y);
}
/* djm created */
public final static void minToOut(Vec2 a, Vec2 b, Vec2 out) {
out.x = a.x < b.x ? a.x : b.x;
out.y = a.y < b.y ? a.y : b.y;
}
/* djm created */
public final static void maxToOut(Vec2 a, Vec2 b, Vec2 out) {
out.x = a.x > b.x ? a.x : b.x;
out.y = a.y > b.y ? a.y : b.y;
}
/**
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() { //automatically generated by Eclipse
final int prime = 31;
int result = 1;
result = prime * result + Float.floatToIntBits(x);
result = prime * result + Float.floatToIntBits(y);
return result;
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) { //automatically generated by Eclipse
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Vec2 other = (Vec2) obj;
if (Float.floatToIntBits(x) != Float.floatToIntBits(other.x))
return false;
if (Float.floatToIntBits(y) != Float.floatToIntBits(other.y))
return false;
return true;
}
}