math.geom2d.transform
Class Scaling2D

java.lang.Object
  math.geom2d.transform.AbstractAffineTransform2D
      math.geom2d.transform.Scaling2D

All Implemented Interfaces:

AffineTransform2D, Bijection2D, Transform2D

public class Scaling2D
extends AbstractAffineTransform2D

Scales a shape in the 2 main directions of the axis, centered at the origin.

Nested Class Summary

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

AbstractAffineTransform2D.Identity2D

Field Summary

protected double	sx
protected double	sy
protected double	xc
protected double	yc

Constructor Summary

Scaling2D(double scale)
Use the same scaling factor for x and y axis.

Scaling2D(double sx, double sy)

Scaling2D(Point2D origin, double sx, double sy)

Method Summary

double[][]	getAffineMatrix() return matrix of the transform coefficients.
double[]	getCoefficients() return coefficients of the transform.
Scaling2D	getInverseTransform()
boolean	isDirect() return true if both scaling factors have the same sign.
boolean	isMotion() return false, as the scaling transform does not preserves areas.

Methods inherited from class math.geom2d.transform.AbstractAffineTransform2D

compose, createRotation, createRotation, createRotation, createScaling, createScaling, createTranslation, createTranslation, equals, 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

Field Detail

sx

protected double sx

sy

protected double sy

xc

protected double xc

yc

protected double yc

Constructor Detail

Scaling2D

public Scaling2D(double scale)

Use the same scaling factor for x and y axis.

Scaling2D

public Scaling2D(double sx,
                 double sy)

Parameters:

sx - scaling in x direction

sy - scaling in y direction

Scaling2D

public Scaling2D(Point2D origin,
                 double sx,
                 double sy)

Parameters:

origin - the invariant point of the transform

sx - scaling in x direction

sy - scaling in y direction

Method Detail

isMotion

public boolean isMotion()

return false, as the scaling transform does not preserves areas.

Specified by:

isMotion in interface AffineTransform2D

Overrides:

isMotion in class AbstractAffineTransform2D

Returns:

true in case of motion.

isDirect

public boolean isDirect()

return true if both scaling factors have the same sign.

Specified by:

isDirect in interface AffineTransform2D

Overrides:

isDirect in class AbstractAffineTransform2D

Returns:

true if transform is direct.

getCoefficients

public double[] getCoefficients()

Description copied from interface: AffineTransform2D

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

getAffineMatrix

public double[][] getAffineMatrix()

Description copied from interface: AffineTransform2D

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

getInverseTransform

public Scaling2D getInverseTransform()