Class RenderContext

java.lang.Object

java.awt.image.renderable.RenderContext

All Implemented Interfaces:

Cloneable

public class RenderContext
extends Object
implements Cloneable

A RenderContext encapsulates the information needed to produce a specific rendering from a RenderableImage. It contains the area to be rendered specified in rendering-independent terms, the resolution at which the rendering is to be performed, and hints used to control the rendering process.

Users create RenderContexts and pass them to the RenderableImage via the createRendering method. Most of the methods of RenderContexts are not meant to be used directly by applications, but by the RenderableImage and operator classes to which it is passed.

The AffineTransform parameter passed into and out of this class are cloned. The RenderingHints and Shape parameters are not necessarily cloneable and are therefore only reference copied. Altering RenderingHints or Shape instances that are in use by instances of RenderContext may have undesired side effects.

Constructor Summary

Constructors

Constructor	Description
RenderContext(AffineTransform usr2dev)	Constructs a RenderContext with a given transform.
RenderContext(AffineTransform usr2dev, RenderingHints hints)	Constructs a RenderContext with a given transform and rendering hints.
RenderContext(AffineTransform usr2dev, Shape aoi)	Constructs a RenderContext with a given transform and area of interest.
RenderContext(AffineTransform usr2dev, Shape aoi, RenderingHints hints)	Constructs a RenderContext with a given transform.

Method Summary

Modifier and Type	Method	Description
Object	clone()	Makes a copy of a RenderContext.
void	concatenateTransform(AffineTransform modTransform)	Modifies the current user-to-device transform by appending another transform.
void	concetenateTransform(AffineTransform modTransform)	Deprecated. replaced by concatenateTransform(AffineTransform).
Shape	getAreaOfInterest()	Gets the ares of interest currently contained in the RenderContext.
RenderingHints	getRenderingHints()	Gets the rendering hints of this RenderContext.
AffineTransform	getTransform()	Gets the current user-to-device AffineTransform.
void	preConcatenateTransform(AffineTransform modTransform)	Modifies the current user-to-device transform by prepending another transform.
void	preConcetenateTransform(AffineTransform modTransform)	Deprecated. replaced by preConcatenateTransform(AffineTransform).
void	setAreaOfInterest(Shape newAoi)	Sets the current area of interest.
void	setRenderingHints(RenderingHints hints)	Sets the rendering hints of this RenderContext.
void	setTransform(AffineTransform newTransform)	Sets the current user-to-device AffineTransform contained in the RenderContext to a given transform.

Methods declared in class Object

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

Modifier and Type	Method	Description
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
String	toString()	Answers a string containing a concise, human-readable description of the receiver.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Constructor Details

RenderContext

public RenderContext(AffineTransform usr2dev,
 Shape aoi,
 RenderingHints hints)

Constructs a RenderContext with a given transform. The area of interest is supplied as a Shape, and the rendering hints are supplied as a RenderingHints object.

Parameters:

usr2dev - an AffineTransform.

aoi - a Shape representing the area of interest.

hints - a RenderingHints object containing rendering hints.

RenderContext

public RenderContext(AffineTransform usr2dev)

Constructs a RenderContext with a given transform. The area of interest is taken to be the entire renderable area. No rendering hints are used.

Parameters:

usr2dev - an AffineTransform.

RenderContext

public RenderContext(AffineTransform usr2dev,
 RenderingHints hints)

Constructs a RenderContext with a given transform and rendering hints. The area of interest is taken to be the entire renderable area.

Parameters:

usr2dev - an AffineTransform.

hints - a RenderingHints object containing rendering hints.

RenderContext

public RenderContext(AffineTransform usr2dev,
 Shape aoi)

Constructs a RenderContext with a given transform and area of interest. The area of interest is supplied as a Shape. No rendering hints are used.

Parameters:

usr2dev - an AffineTransform.

aoi - a Shape representing the area of interest.

Method Details

getRenderingHints

public RenderingHints getRenderingHints()

Gets the rendering hints of this RenderContext.

Returns:

a RenderingHints object that represents the rendering hints of this RenderContext.

See Also:

• setRenderingHints(RenderingHints)

setRenderingHints

public void setRenderingHints(RenderingHints hints)

Sets the rendering hints of this RenderContext.

Parameters:

hints - a RenderingHints object that represents the rendering hints to assign to this RenderContext.

See Also:

• getRenderingHints()

setTransform

public void setTransform(AffineTransform newTransform)

Sets the current user-to-device AffineTransform contained in the RenderContext to a given transform.

Parameters:

newTransform - the new AffineTransform.

See Also:

• getTransform()

preConcatenateTransform

public void preConcatenateTransform(AffineTransform modTransform)

Modifies the current user-to-device transform by prepending another transform. In matrix notation the operation is:

[this] = [modTransform] x [this]

Parameters:

modTransform - the AffineTransform to prepend to the current usr2dev transform.

Since:

1.3

preConcetenateTransform

@Deprecated
public void preConcetenateTransform(AffineTransform modTransform)

Deprecated.

replaced by preConcatenateTransform(AffineTransform).

Modifies the current user-to-device transform by prepending another transform. In matrix notation the operation is:

[this] = [modTransform] x [this]

This method does the same thing as the preConcatenateTransform method. It is here for backward compatibility with previous releases which misspelled the method name.

Parameters:

modTransform - the AffineTransform to prepend to the current usr2dev transform.

concatenateTransform

public void concatenateTransform(AffineTransform modTransform)

Modifies the current user-to-device transform by appending another transform. In matrix notation the operation is:

[this] = [this] x [modTransform]

Parameters:

modTransform - the AffineTransform to append to the current usr2dev transform.

Since:

1.3

concetenateTransform

@Deprecated
public void concetenateTransform(AffineTransform modTransform)

Deprecated.

replaced by concatenateTransform(AffineTransform).

Modifies the current user-to-device transform by appending another transform. In matrix notation the operation is:

[this] = [this] x [modTransform]

This method does the same thing as the concatenateTransform method. It is here for backward compatibility with previous releases which misspelled the method name.

Parameters:

modTransform - the AffineTransform to append to the current usr2dev transform.

getTransform

public AffineTransform getTransform()

Gets the current user-to-device AffineTransform.

Returns:

a reference to the current AffineTransform.

See Also:

• setTransform(AffineTransform)

setAreaOfInterest

public void setAreaOfInterest(Shape newAoi)

Sets the current area of interest. The old area is discarded.

Parameters:

newAoi - The new area of interest.

See Also:

• getAreaOfInterest()

getAreaOfInterest

public Shape getAreaOfInterest()

Gets the ares of interest currently contained in the RenderContext.

Returns:

a reference to the area of interest of the RenderContext, or null if none is specified.

See Also:

• setAreaOfInterest(Shape)

clone

public Object clone()

Makes a copy of a RenderContext. The area of interest is copied by reference. The usr2dev AffineTransform and hints are cloned, while the area of interest is copied by reference.

Overrides:

clone in class Object

Returns:

the new cloned RenderContext.