public class Transform extends Resource
Application code must explicitly invoke the Transform.dispose()
method to release the operating system resources managed by each instance
when those instances are no longer required.
This class requires the operating system's advanced graphics subsystem which may not be available on some platforms.
Modifier and Type  Field and Description 

long 
handle
the OS resource for the Transform
(Warning: This field is platform dependent)
IMPORTANT: This field is not part of the SWT
public API.

Constructor and Description 

Transform(Device device)
Constructs a new identity Transform.

Transform(Device device,
float[] elements)
Constructs a new Transform given an array of elements that represent the
matrix that describes the transformation.

Transform(Device device,
float m11,
float m12,
float m21,
float m22,
float dx,
float dy)
Constructs a new Transform given all of the elements that represent the
matrix that describes the transformation.

Modifier and Type  Method and Description 

void 
getElements(float[] elements)
Fills the parameter with the values of the transformation matrix
that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}.

void 
identity()
Modifies the receiver such that the matrix it represents becomes the
identity matrix.

void 
invert()
Modifies the receiver such that the matrix it represents becomes
the mathematical inverse of the matrix it previously represented.

boolean 
isDisposed()
Returns
true if the Transform has been disposed,
and false otherwise. 
boolean 
isIdentity()
Returns
true if the Transform represents the identity matrix
and false otherwise. 
void 
multiply(Transform matrix)
Modifies the receiver such that the matrix it represents becomes the
the result of multiplying the matrix it previously represented by the
argument.

void 
rotate(float angle)
Modifies the receiver so that it represents a transformation that is
equivalent to its previous transformation rotated by the specified angle.

void 
scale(float scaleX,
float scaleY)
Modifies the receiver so that it represents a transformation that is
equivalent to its previous transformation scaled by (scaleX, scaleY).

void 
setElements(float m11,
float m12,
float m21,
float m22,
float dx,
float dy)
Modifies the receiver to represent a new transformation given all of
the elements that represent the matrix that describes that transformation.

void 
shear(float shearX,
float shearY)
Modifies the receiver so that it represents a transformation that is
equivalent to its previous transformation sheared by (shearX, shearY).

String 
toString()
Returns a string containing a concise, humanreadable
description of the receiver.

void 
transform(float[] pointArray)
Given an array containing points described by alternating x and y values,
modify that array such that each point has been replaced with the result of
applying the transformation represented by the receiver to that point.

void 
translate(float offsetX,
float offsetY)
Modifies the receiver so that it represents a transformation that is
equivalent to its previous transformation translated by (offsetX, offsetY).

public long handle
IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.
public Transform(Device device)
This operation requires the operating system's advanced graphics subsystem which may not be available on some platforms.
device
 the device on which to allocate the TransformIllegalArgumentException
 SWTException
 SWTError
 Resource.dispose()
public Transform(Device device, float[] elements)
This operation requires the operating system's advanced graphics subsystem which may not be available on some platforms.
device
 the device on which to allocate the Transformelements
 an array of floats that describe the transformation matrixIllegalArgumentException
 SWTException
 SWTError
 Resource.dispose()
public Transform(Device device, float m11, float m12, float m21, float m22, float dx, float dy)
This operation requires the operating system's advanced graphics subsystem which may not be available on some platforms.
device
 the device on which to allocate the Transformm11
 the first element of the first row of the matrixm12
 the second element of the first row of the matrixm21
 the first element of the second row of the matrixm22
 the second element of the second row of the matrixdx
 the third element of the first row of the matrixdy
 the third element of the second row of the matrixIllegalArgumentException
 SWTException
 SWTError
 Resource.dispose()
public void getElements(float[] elements)
elements
 array to hold the matrix valuesSWTException
 IllegalArgumentException
 public void identity()
SWTException
 public void invert()
SWTException
 public boolean isDisposed()
true
if the Transform has been disposed,
and false
otherwise.
This method gets the dispose state for the Transform.
When a Transform has been disposed, it is an error to
invoke any other method (except Resource.dispose()
) using the Transform.
isDisposed
in class Resource
true
when the Transform is disposed, and false
otherwisepublic boolean isIdentity()
true
if the Transform represents the identity matrix
and false otherwise.true
if the receiver is an identity Transform, and false
otherwisepublic void multiply(Transform matrix)
matrix
 the matrix to multiply the receiver bySWTException
 IllegalArgumentException
 public void rotate(float angle)
angle
 the angle to rotate the transformation bySWTException
 public void scale(float scaleX, float scaleY)
scaleX
 the amount to scale in the X directionscaleY
 the amount to scale in the Y directionSWTException
 public void setElements(float m11, float m12, float m21, float m22, float dx, float dy)
m11
 the first element of the first row of the matrixm12
 the second element of the first row of the matrixm21
 the first element of the second row of the matrixm22
 the second element of the second row of the matrixdx
 the third element of the first row of the matrixdy
 the third element of the second row of the matrixSWTException
 public void shear(float shearX, float shearY)
shearX
 the shear factor in the X directionshearY
 the shear factor in the Y directionSWTException
 public void transform(float[] pointArray)
pointArray
 an array of alternating x and y values to be transformedIllegalArgumentException
 SWTException
 public void translate(float offsetX, float offsetY)
offsetX
 the distance to translate in the X directionoffsetY
 the distance to translate in the Y directionSWTException

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