mikera.transformz

Class ATransform

java.lang.Object

mikera.transformz.ATransform

All Implemented Interfaces:

java.lang.Cloneable, ITransform

Direct Known Subclasses:

AAffineTransform, AOpTransform, ASizedTransform, CompoundTransform, ScalarFunction, SubsetTransform, VectorFunction

public abstract class ATransform
extends java.lang.Object
implements java.lang.Cloneable, ITransform

Abstract base class for all vector transformations. A transformation is defined as any function mapping an N-dimensional vector to an M-dimensional vector.

Constructor Summary

Constructors

Constructor and Description
ATransform()

Method Summary

Modifier and Type	Method and Description
double	calculateElement(int i, AVector inputVector) Calculates a single element of the output.
ATransform	clone() Clones the transform, performing a deep copy where needed
ATransform	compose(ATransform trans) Composes this transformation with another transformation, returning a new combined transformation
void	composeWith(ATransform trans) Composes this transformation with a given transformation, mutating the transformation to represent the combined transform
abstract int	inputDimensions() Returns the number of dimensions required for input vectors
ATransform	inverse() Return the inverse of this transformation (if possible).
boolean	isIdentity() Returns true if this transform is known to be the identity function, i.e.
boolean	isInvertible() Returns true if this transform is invertible
boolean	isLinear() Returns true if this transformation is guaranteed to be linear
boolean	isSquare() Returns true if the transform is square (same number of input and output dimensions)
abstract int	outputDimensions() Returns the number of dimensions required for output vectors
ATransform	takeComponents(Index components) Returns a wrapper transform that returns a subset of this transform's output components
ATransform	takeComponents(int length) Returns a wrapper transform that returns a subset of this transform's output components
ATransform	takeComponents(int start, int length) Returns a wrapper transform that returns a subset of this transform's output components
AVector	transform(AVector v) Transforms a vector, returning a new transformed vector
abstract void	transform(AVector source, AVector dest) Transforms the source vector, storing the result in the given destination vector
Vector	transform(Vector v) Transforms a vector, returning a new transformed vector
void	transformInPlace(AVector v) Transforms a vector destructively.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ATransform

public ATransform()

Method Detail

transform

public abstract void transform(AVector source,
                               AVector dest)

Description copied from interface: ITransform

Transforms the source vector, storing the result in the given destination vector

Specified by:

transform in interface ITransform

inputDimensions

public abstract int inputDimensions()

Description copied from interface: ITransform

Returns the number of dimensions required for input vectors

Specified by:

inputDimensions in interface ITransform

Returns:

outputDimensions

public abstract int outputDimensions()

Description copied from interface: ITransform

Returns the number of dimensions required for output vectors

Specified by:

outputDimensions in interface ITransform

Returns:

clone

public ATransform clone()

Clones the transform, performing a deep copy where needed

Overrides:

clone in class java.lang.Object

compose

public ATransform compose(ATransform trans)

Composes this transformation with another transformation, returning a new combined transformation

composeWith

public void composeWith(ATransform trans)

Composes this transformation with a given transformation, mutating the transformation to represent the combined transform

isLinear

public boolean isLinear()

Returns true if this transformation is guaranteed to be linear

Returns:

isSquare

public boolean isSquare()

Returns true if the transform is square (same number of input and output dimensions)

Returns:

transform

public AVector transform(AVector v)

Transforms a vector, returning a new transformed vector

Parameters:

v -

Returns:

transform

public Vector transform(Vector v)

Transforms a vector, returning a new transformed vector

Parameters:

v -

Returns:

calculateElement

public double calculateElement(int i,
                               AVector inputVector)

Calculates a single element of the output. Not necessarily faster than calculating full output, but can be in some circumstances.

transformInPlace

public void transformInPlace(AVector v)

Transforms a vector destructively. Intended for fast non-allocating transforms

Parameters:

v -

isIdentity

public boolean isIdentity()

Returns true if this transform is known to be the identity function, i.e. it maps all vectors to themselves

takeComponents

public ATransform takeComponents(int length)

Returns a wrapper transform that returns a subset of this transform's output components

takeComponents

public ATransform takeComponents(int start,
                                 int length)

Returns a wrapper transform that returns a subset of this transform's output components

takeComponents

public ATransform takeComponents(Index components)

Returns a wrapper transform that returns a subset of this transform's output components

inverse

public ATransform inverse()

Return the inverse of this transformation (if possible). Throws an exception if the inverse cannot be computed.

Returns:

isInvertible

public boolean isInvertible()

Returns true if this transform is invertible