com.ardor3d.math.Ring Maven / Gradle / Ivy
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/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at .
*/
package com.ardor3d.math;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import com.ardor3d.math.type.ReadOnlyRing;
import com.ardor3d.math.type.ReadOnlyVector3;
import com.ardor3d.util.export.InputCapsule;
import com.ardor3d.util.export.OutputCapsule;
import com.ardor3d.util.export.Savable;
/**
* Ring defines a flat ring or disk within three dimensional space that is specified via the ring's center
* point, an up vector, an inner radius, and an outer radius.
*/
public class Ring implements Cloneable, Savable, Externalizable, ReadOnlyRing, Poolable {
private static final long serialVersionUID = 1L;
private static final ObjectPool RING_POOL = ObjectPool.create(Ring.class, MathConstants.maxMathPoolSize);
private final Vector3 _center = new Vector3();
private final Vector3 _up = new Vector3(Vector3.UNIT_Y);
private double _innerRadius, _outerRadius;
/**
* Constructor creates a new Ring lying on the XZ plane, centered at the origin, with an inner radius
* of zero and an outer radius of one (a unit disk).
*/
public Ring() {
_innerRadius = 0.0;
_outerRadius = 1.0;
}
/**
* Copy constructor.
*
* @param source
* the ring to copy from.
*/
public Ring(final ReadOnlyRing source) {
this(source.getCenter(), source.getUp(), source.getInnerRadius(), source.getOuterRadius());
}
/**
* Constructor creates a new Ring with defined center point, up vector, and inner and outer radii.
*
* @param center
* the center of the ring.
* @param up
* the unit up vector defining the ring's orientation.
* @param innerRadius
* the ring's inner radius.
* @param outerRadius
* the ring's outer radius.
*/
public Ring(final ReadOnlyVector3 center, final ReadOnlyVector3 up, final double innerRadius,
final double outerRadius) {
_center.set(center);
_up.set(up);
_innerRadius = innerRadius;
_outerRadius = outerRadius;
}
/**
* Copy the value of the given source Ring into this Ring.
*
* @param source
* the source of the data to copy.
* @return this ring for chaining
* @throws NullPointerException
* if source is null.
*/
public Ring set(final ReadOnlyRing source) {
_center.set(source.getCenter());
_up.set(source.getUp());
_innerRadius = source.getInnerRadius();
_outerRadius = source.getOuterRadius();
return this;
}
/**
* getCenter returns the center of the ring.
*
* @return the center of the ring.
*/
@Override
public ReadOnlyVector3 getCenter() {
return _center;
}
/**
* setCenter sets the center of the ring.
*
* @param center
* the center of the ring.
*/
public void setCenter(final ReadOnlyVector3 center) {
_center.set(center);
}
/**
* getUp returns the ring's up vector.
*
* @return the ring's up vector.
*/
@Override
public ReadOnlyVector3 getUp() {
return _up;
}
/**
* setUp sets the ring's up vector.
*
* @param up
* the ring's up vector.
*/
public void setUp(final ReadOnlyVector3 up) {
_up.set(up);
}
/**
* getInnerRadius returns the ring's inner radius.
*
* @return the ring's inner radius.
*/
@Override
public double getInnerRadius() {
return _innerRadius;
}
/**
* setInnerRadius sets the ring's inner radius.
*
* @param innerRadius
* the ring's inner radius.
*/
public void setInnerRadius(final double innerRadius) {
_innerRadius = innerRadius;
}
/**
* getOuterRadius returns the ring's outer radius.
*
* @return the ring's outer radius.
*/
@Override
public double getOuterRadius() {
return _outerRadius;
}
/**
* setOuterRadius sets the ring's outer radius.
*
* @param outerRadius
* the ring's outer radius.
*/
public void setOuterRadius(final double outerRadius) {
_outerRadius = outerRadius;
}
/**
*
* random returns a random point within the ring.
*
* @param store
* Vector to store result in
* @return a random point within the ring.
*/
@Override
public Vector3 random(final Vector3 store) {
Vector3 result = store;
if (result == null) {
result = new Vector3();
}
final Vector3 b1 = Vector3.fetchTempInstance();
final Vector3 b2 = Vector3.fetchTempInstance();
// compute a random radius according to the ring area distribution
final double inner2 = _innerRadius * _innerRadius;
final double outer2 = _outerRadius * _outerRadius;
final double r = Math.sqrt(inner2 + MathUtils.nextRandomFloat() * (outer2 - inner2));
final double theta = MathUtils.nextRandomFloat() * MathUtils.TWO_PI;
_up.cross(Vector3.UNIT_X, b1);
if (b1.lengthSquared() < MathUtils.EPSILON) {
_up.cross(Vector3.UNIT_Y, b1);
}
b1.normalizeLocal();
_up.cross(b1, b2);
result.set(b1).multiplyLocal(r * MathUtils.cos(theta)).addLocal(_center);
b2.scaleAdd(r * MathUtils.sin(theta), result, result);
Vector3.releaseTempInstance(b1);
Vector3.releaseTempInstance(b2);
return result;
}
/**
* Check a ring... if it is null or its radii, or the doubles of its center or up are NaN or infinite, return false.
* Else return true.
*
* @param ring
* the ring to check
* @return true or false as stated above.
*/
public static boolean isValid(final ReadOnlyRing ring) {
if (ring == null) {
return false;
}
if (Double.isNaN(ring.getInnerRadius()) || Double.isInfinite(ring.getInnerRadius())) {
return false;
}
if (Double.isNaN(ring.getOuterRadius()) || Double.isInfinite(ring.getOuterRadius())) {
return false;
}
return Vector3.isValid(ring.getCenter()) && Vector3.isValid(ring.getUp());
}
/**
* @return the string representation of this ring.
*/
@Override
public String toString() {
return "com.ardor3d.math.Ring [Center: " + _center + " Up: " + _up + " - radii, outer: " + _outerRadius
+ " inner: " + _innerRadius + "]";
}
/**
* @return returns a unique code for this ring object based on its values. If two rings are numerically equal, they
* will return the same hash code value.
*/
@Override
public int hashCode() {
int result = 17;
result += 31 * result + _center.hashCode();
result += 31 * result + _up.hashCode();
final long ir = Double.doubleToLongBits(getInnerRadius());
result += 31 * result + (int) (ir ^ ir >>> 32);
final long or = Double.doubleToLongBits(getOuterRadius());
result += 31 * result + (int) (or ^ or >>> 32);
return result;
}
/**
* @param o
* the object to compare for equality
* @return true if this ring and the provided ring have the same constant and normal values.
*/
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof ReadOnlyRing)) {
return false;
}
final ReadOnlyRing comp = (ReadOnlyRing) o;
return getInnerRadius() == comp.getInnerRadius() && getOuterRadius() == comp.getOuterRadius()
&& _up.equals(comp.getUp()) && _center.equals(comp.getCenter());
}
// /////////////////
// Method for Cloneable
// /////////////////
@Override
public Ring clone() {
return new Ring(this);
}
// /////////////////
// Methods for Savable
// /////////////////
@Override
public Class getClassTag() {
return this.getClass();
}
@Override
public void write(final OutputCapsule capsule) throws IOException {
capsule.write(_center, "center", new Vector3(Vector3.ZERO));
capsule.write(_up, "up", new Vector3(Vector3.UNIT_Z));
capsule.write(_innerRadius, "innerRadius", 0.0);
capsule.write(_outerRadius, "outerRadius", 1.0);
}
@Override
public void read(final InputCapsule capsule) throws IOException {
_center.set((Vector3) capsule.readSavable("center", new Vector3(Vector3.ZERO)));
_up.set((Vector3) capsule.readSavable("up", new Vector3(Vector3.UNIT_Z)));
_innerRadius = capsule.readDouble("innerRadius", 0.0);
_outerRadius = capsule.readDouble("outerRadius", 1.0);
}
// /////////////////
// Methods for Externalizable
// /////////////////
/**
* Used with serialization. Not to be called manually.
*
* @param in
* ObjectInput
* @throws IOException
* @throws ClassNotFoundException
*/
@Override
public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
setCenter((Vector3) in.readObject());
setUp((Vector3) in.readObject());
setInnerRadius(in.readDouble());
setOuterRadius(in.readDouble());
}
/**
* Used with serialization. Not to be called manually.
*
* @param out
* ObjectOutput
* @throws IOException
*/
@Override
public void writeExternal(final ObjectOutput out) throws IOException {
out.writeObject(_center);
out.writeObject(_up);
out.writeDouble(_innerRadius);
out.writeDouble(_outerRadius);
}
// /////////////////
// Methods for creating temp variables (pooling)
// /////////////////
/**
* @return An instance of Ring that is intended for temporary use in calculations and so forth. Multiple calls to
* the method should return instances of this class that are not currently in use.
*/
public final static Ring fetchTempInstance() {
if (MathConstants.useMathPools) {
return Ring.RING_POOL.fetch();
} else {
return new Ring();
}
}
/**
* Releases a Ring back to be used by a future call to fetchTempInstance. TAKE CARE: this Ring object should no
* longer have other classes referencing it or "Bad Things" will happen.
*
* @param ring
* the Ring to release.
*/
public final static void releaseTempInstance(final Ring ring) {
if (MathConstants.useMathPools) {
Ring.RING_POOL.release(ring);
}
}
}