public class

RenderContext

extends Object
implements Cloneable
java.lang.Object
   ↳ java.awt.image.renderable.RenderContext

Class Overview

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.

Summary

Public Constructors
RenderContext(AffineTransform usr2dev, Shape aoi, RenderingHints hints)
Constructs a RenderContext with a given transform.
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.
Public Methods
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)
This method is 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)
This method is 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.
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

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.

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.

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.

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.

Public Methods

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.

Returns
  • the new cloned RenderContext.

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.

public void concetenateTransform (AffineTransform modTransform)

This method is 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.

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

public RenderingHints getRenderingHints ()

Gets the rendering hints of this RenderContext.

Returns
  • a RenderingHints object that represents the rendering hints of this RenderContext.
See Also

public AffineTransform getTransform ()

Gets the current user-to-device AffineTransform.

Returns
  • a reference to the current AffineTransform.
See Also

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.

public void preConcetenateTransform (AffineTransform modTransform)

This method is 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.

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

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

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