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/*
* File: Quaternion.java
* Authors: Justin Basilico
* Company: Sandia National Laboratories
* Project: Cognitive Foundry
*
* Copyright February 07, 2008, Sandia Corporation.
* Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
* license for use of this work by or on behalf of the U.S. Government. Export
* of this program may require a license from the United States Government.
* See CopyrightHistory.txt for complete details.
*
*
*/
package gov.sandia.cognition.math.matrix;
import gov.sandia.cognition.math.matrix.mtj.Vector3;
import gov.sandia.cognition.util.CloneableSerializable;
/**
* Interface for a mathematical quaternion, which represents rotations using
* four dimensions. This representation is useful for manipulating for
* animations and for utilizing in machine learning algorithms.
*
* @author Justin Basilico
* @since 2.1
*/
public interface Quaternion
extends CloneableSerializable, Vectorizable
{
/**
* Clones this object.
*
* @return A clone of this object.
*/
public Quaternion clone();
/**
* Sets the elements of this quaternion equal to the elements of the given
* quaternion.
*
* @param other The other quaternion to copy the values of.
*/
public void setElements(
final Quaternion other);
/**
* Returns the normalized version of the quaternion.
*
* @return The normalized version of the quaternion.
*/
public Quaternion normalize();
/**
* Normalizes the quaternion in-place.
*/
public void normalizeEquals();
/**
* Returns the inverse of this quaternion.
*
* @return The inverse of this quaternion
*/
public Quaternion inverse();
/**
* Changes this quaternion to be its inverse.
*/
public void inverseEquals();
/**
* Rotates the given vector by this quaternion by performing a
* multiplication with this quaternion's rotation matrix: M * v.
*
* @param vector The 3-dimensional vector to rotate.
* @return The vector rotated by this orientation.
*/
public Vector3 rotate(
final Vector vector);
/**
* Multiplies {@code this * other} and returns the result.
*
* @param other The other quaternion to multiply with.
* @return The result of the multiplication.
*/
public Quaternion compose(
final Quaternion other);
/**
* Multiplies {@code this = this * other}, thus modifying this object.
*
* @param other The other quaternion to multiply with.
*/
public void composeEquals(
final Quaternion other);
/**
* Interpolates between this quaternion and the given quaternion.
*
* @param other The other quaternion.
* @param alpha The interpolation parameter.
* @return The interpolated quaternion.
*/
public Quaternion interpolate(
final Quaternion other,
final double alpha);
/**
* Interpolates between this quaternion and the given quaternion and sets
* it in this quaternion.
*
* @param other The other quaternion.
* @param alpha The interpolation parameter.
*/
public void interpolateEquals(
final Quaternion other,
final double alpha);
/**
* Converts the quaternion to a 3-by-3 rotation matrix.
*
* @return A 3-by-3 rotation matrix.
*/
public Matrix convertToRotationMatrix();
/**
* Sets the quaternion to be equivalent to the given a 3-by-3 rotation
* matrix.
*
* @param rotationMatrix A 3-by-3 rotation matrix.
*/
public void convertFromRotationMatrix(
final Matrix rotationMatrix);
/**
* Determines if this quaternion is equal to the given quaternion.
*
* @param other The other quaternion to determine equality with.
* @return True if the two are equal; otherwise, false.
*/
public boolean equals(
final Quaternion other);
/**
* Determines if this quaternion is equal to the given quaternion, using
* a given threshold for determining if two numbers are equal.
*
* @param other The other quaternion.
* @param effectiveZero The effective zero value for performing the
* fuzzy equality. Typically, this is a number close to zero.
* @return True if the two are equal; otherwise, false.
*/
public boolean equals(
final Quaternion other,
final double effectiveZero);
/**
* Gets the w component of the quaternion.
*
* @return The w component of the quaternion.
*/
public double getW();
/**
* Sets the w component of the quaternion.
*
* @param w The w component of the quaternion.
*/
public void setW(
final double w);
/**
* Gets the x component of the quaternion.
*
* @return The x component of the quaternion.
*/
public double getX();
/**
* Sets the x component of the quaternion.
*
* @param x The x component of the quaternion.
*/
public void setX(
final double x);
/**
* Gets the y component of the quaternion.
*
* @return The y component of the quaternion.
*/
public double getY();
/**
* Sets the y component of the quaternion.
*
* @param y The y component of the quaternion.
*/
public void setY(
final double y);
/**
* Gets the z component of the quaternion.
*
* @return The z component of the quaternion.
*/
public double getZ();
/**
* Sets the z component of the quaternion.
*
* @param z The z component of the quaternion.
*/
public void setZ(
final double z);
/**
* Sets all of the elements of the quaternion in w-x-y-z order.
*
* @param w The w component of the quaternion.
* @param x The x component of the quaternion.
* @param y The y component of the quaternion.
* @param z The z component of the quaternion.
*/
public void setWXYZ(
final double w,
final double x,
final double y,
final double z);
/**
* Sets all of the elements of the quaternion in x-y-z-w order.
*
* @param x The x component of the quaternion.
* @param y The y component of the quaternion.
* @param z The z component of the quaternion.
* @param w The w component of the quaternion.
*/
public void setXYZW(
final double x,
final double y,
final double z,
final double w);
}
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