Package org.apache.sis.referencing.operation.transform

Class ConstantTransform1D

java.lang.Object

org.apache.sis.io.wkt.FormattableObject

org.apache.sis.referencing.operation.transform.AbstractMathTransform

org.apache.sis.referencing.operation.transform.AbstractMathTransform1D

org.apache.sis.referencing.operation.transform.LinearTransform1D

org.apache.sis.referencing.operation.transform.ConstantTransform1D

All Implemented Interfaces:

Serializable, Parameterized, LinearTransform, LenientComparable, org.opengis.referencing.operation.MathTransform, org.opengis.referencing.operation.MathTransform1D

final class ConstantTransform1D
extends LinearTransform1D

A one dimensional, constant transform. Output values are set to a constant value regardless of input values. This class is a special case of LinearTransform1D in which LinearTransform1D.scale = 0 and LinearTransform1D.offset = constant. However, this specialized ConstantTransform1D class is faster.

ConstantTransform1D behavior differs from LinearTransform1D behavior is one aspect: NaN values are ignored and converted to the constant value. By contrast, LinearTransform1D let those values to NaN. Overwriting NaN by the constant value is required by org.apache.sis.coverage.

Since:

0.5

Version:

0.5

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform1D

AbstractMathTransform1D.Inverse

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final ConstantTransform1D	ONE	A transform for the one constant.
private static final long	serialVersionUID	Serial number for inter-operability with different versions.
(package private) static final ConstantTransform1D	ZERO	A transform for the positive zero constant.

Fields inherited from class org.apache.sis.referencing.operation.transform.LinearTransform1D

NEGATE, offset, scale

Fields inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform

MAXIMUM_BUFFER_SIZE, MAXIMUM_FAILURES

Constructor Summary

Constructors

Constructor	Description
ConstantTransform1D(double offset)	Constructs a new constant transform.

Method Summary

Modifier and Type	Method	Description
double	transform(double value)	Transforms the specified value.
void	transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)	Transforms many positions in a list of coordinate values.
void	transform(double[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)	Transforms many positions in a list of coordinate values.
void	transform(float[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)	Transforms many positions in a list of coordinate values.
void	transform(float[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)	Transforms many positions in a list of coordinate values.

Methods inherited from class org.apache.sis.referencing.operation.transform.LinearTransform1D

computeHashCode, constant, create, deltaTransform, derivative, derivative, equals, getMatrix, getParameterDescriptors, getParameterValues, inverse, isAffine, isIdentity, toString, transform

Methods inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform1D

getSourceDimensions, getTargetDimensions

Methods inherited from class org.apache.sis.referencing.operation.transform.AbstractMathTransform

beforeFormat, equals, formatTo, getContextualParameters, getDomain, hashCode, isInverseEquals, mismatchedDimension, transform, tryConcatenate

Methods inherited from class org.apache.sis.io.wkt.FormattableObject

print, toString, toWKT

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.opengis.referencing.operation.MathTransform

getSourceDimensions, getTargetDimensions, toWKT, transform

Field Details

serialVersionUID

private static final long serialVersionUID

Serial number for inter-operability with different versions.

See Also:

• Constant Field Values

ZERO

static final ConstantTransform1D ZERO

A transform for the positive zero constant.

ONE

static final ConstantTransform1D ONE

A transform for the one constant.

Constructor Details

ConstantTransform1D

ConstantTransform1D(double offset)

Constructs a new constant transform.

Parameters:

offset - the offset term in the linear equation.

Method Details

transform

public double transform(double value)

Transforms the specified value.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform1D

Overrides:

transform in class LinearTransform1D

Parameters:

value - the value to transform.

Returns:

the transformed value.

transform

public void transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 int numPts)

Transforms many positions in a list of coordinate values.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class LinearTransform1D

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

transform

public void transform(float[] srcPts,
 int srcOff,
 float[] dstPts,
 int dstOff,
 int numPts)

Transforms many positions in a list of coordinate values.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class LinearTransform1D

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

transform

public void transform(double[] srcPts,
 int srcOff,
 float[] dstPts,
 int dstOff,
 int numPts)

Transforms many positions in a list of coordinate values.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class LinearTransform1D

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

transform

public void transform(float[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 int numPts)

Transforms many positions in a list of coordinate values.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class LinearTransform1D

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.