math.geom2d.transform
Class Homothecy2D

java.lang.Object
  math.geom2d.transform.AbstractAffineTransform2D
      math.geom2d.transform.Homothecy2D

All Implemented Interfaces:

AffineTransform2D, Bijection2D, Similarity2D, Transform2D

Direct Known Subclasses:

LinearHomothecy2D, PointSymmetry2D

public class Homothecy2D
extends AbstractAffineTransform2D
implements Similarity2D

Defines a homothetic transform.

Nested Class Summary

Nested classes/interfaces inherited from class math.geom2d.transform.AbstractAffineTransform2D

AbstractAffineTransform2D.Identity2D

Field Summary

protected double	k
protected double	x0
protected double	y0

Constructor Summary

Homothecy2D(double k)
Defines a homothetie with factor k centered at the origin.

Homothecy2D(double xp, double yp, double k)

Homothecy2D(java.awt.geom.Point2D point, double k)

Method Summary

double[][]	getAffineMatrix() return matrix of the transform coefficients.
double[]	getCoefficients() return coefficients of the transform.
Homothecy2D	getInverseTransform()
LinearHomothecy2D	getLinearPart()
double	getScalingFactor() Returns the scaling factor of the transform.
Translation2D	getTranslationPart()
boolean	isMotion() The homothety is a motion if the dilation factor is equal to 1.

Methods inherited from class math.geom2d.transform.AbstractAffineTransform2D

compose, createRotation, createRotation, createRotation, createScaling, createScaling, createTranslation, createTranslation, equals, isDirect, isDirect, isIdentity, isIdentity, isIsometry, isIsometry, isMotion, isSimilarity, isSimilarity, transform, transform, transform

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface math.geom2d.transform.AffineTransform2D

compose, isDirect, isIdentity, isIsometry, isSimilarity

Methods inherited from interface math.geom2d.transform.Transform2D

transform, transform, transform

Field Detail

x0

protected double x0

y0

protected double y0

k

protected double k

Constructor Detail

Homothecy2D

public Homothecy2D(double k)

Defines a homothetie with factor k centered at the origin.

Homothecy2D

public Homothecy2D(java.awt.geom.Point2D point,
                   double k)

Homothecy2D

public Homothecy2D(double xp,
                   double yp,
                   double k)

Method Detail

isMotion

public boolean isMotion()

The homothety is a motion if the dilation factor is equal to 1.

Specified by:

isMotion in interface AffineTransform2D

Overrides:

isMotion in class AbstractAffineTransform2D

Returns:

true in case of motion.

getCoefficients

public double[] getCoefficients()

Description copied from interface: AffineTransform2D

return coefficients of the transform. Result is an array of 6 double.

Specified by:

getCoefficients in interface AffineTransform2D

getAffineMatrix

public double[][] getAffineMatrix()

Description copied from interface: AffineTransform2D

return matrix of the transform coefficients. Result is a 2x3 array of double.

Specified by:

getAffineMatrix in interface AffineTransform2D

getInverseTransform

public Homothecy2D getInverseTransform()

Specified by:

getInverseTransform in interface Bijection2D

getScalingFactor

public double getScalingFactor()

Description copied from interface: Similarity2D

Returns the scaling factor of the transform. The scaling factor is positive for direct transforms.

Specified by:

getScalingFactor in interface Similarity2D

Returns:

the scaling factor of the transform.

getLinearPart

public LinearHomothecy2D getLinearPart()

Specified by:

getLinearPart in interface Similarity2D

Returns:

the linear part of the transform.

getTranslationPart

public Translation2D getTranslationPart()

Specified by:

getTranslationPart in interface Similarity2D

Returns:

the translation part of the transform.