RenderContext (Java Platform SE 8 ) (original) (raw)

• 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

  All Methods Instance Methods Concrete Methods Deprecated Methods

  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.
  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.
  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 inherited from class java.lang.[Object](../../../../java/lang/Object.html "class in java.lang")  
     `[equals](../../../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../../../java/lang/Object.html#finalize--), [getClass](../../../../java/lang/Object.html#getClass--), [hashCode](../../../../java/lang/Object.html#hashCode--), [notify](../../../../java/lang/Object.html#notify--), [notifyAll](../../../../java/lang/Object.html#notifyAll--), [toString](../../../../java/lang/Object.html#toString--), [wait](../../../../java/lang/Object.html#wait--), [wait](../../../../java/lang/Object.html#wait-long-), [wait](../../../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### RenderContext  
     public RenderContext([AffineTransform](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") usr2dev,  
                          [Shape](../../../../java/awt/Shape.html "interface in java.awt") aoi,  
                          [RenderingHints](../../../../java/awt/RenderingHints.html "class in java.awt") 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](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") 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](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") usr2dev,  
                          [RenderingHints](../../../../java/awt/RenderingHints.html "class in java.awt") 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](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") usr2dev,  
                          [Shape](../../../../java/awt/Shape.html "interface in java.awt") 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 Detail

    * #### getRenderingHints  
    public [RenderingHints](../../../../java/awt/RenderingHints.html "class in java.awt") getRenderingHints()  
    Gets the rendering hints of this `RenderContext`.  
    Returns:  
    a `RenderingHints` object that represents the rendering hints of this `RenderContext`.  
    See Also:  
    [setRenderingHints(RenderingHints)](../../../../java/awt/image/renderable/RenderContext.html#setRenderingHints-java.awt.RenderingHints-)  
    * #### setRenderingHints  
    public void setRenderingHints([RenderingHints](../../../../java/awt/RenderingHints.html "class in java.awt") 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()](../../../../java/awt/image/renderable/RenderContext.html#getRenderingHints--)  
    * #### setTransform  
    public void setTransform([AffineTransform](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") newTransform)  
    Sets the current user-to-device AffineTransform contained in the RenderContext to a given transform.  
    Parameters:  
    `newTransform` \- the new AffineTransform.  
    See Also:  
    [getTransform()](../../../../java/awt/image/renderable/RenderContext.html#getTransform--)  
    * #### preConcatenateTransform  
    public void preConcatenateTransform([AffineTransform](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") 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](../../../../java/lang/Deprecated.html "annotation in java.lang")  
    public void preConcetenateTransform([AffineTransform](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") modTransform)  
    Deprecated.  
    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](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") 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](../../../../java/lang/Deprecated.html "annotation in java.lang")  
    public void concetenateTransform([AffineTransform](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") modTransform)  
    Deprecated.  
    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](../../../../java/awt/geom/AffineTransform.html "class in java.awt.geom") getTransform()  
    Gets the current user-to-device AffineTransform.  
    Returns:  
    a reference to the current AffineTransform.  
    See Also:  
    [setTransform(AffineTransform)](../../../../java/awt/image/renderable/RenderContext.html#setTransform-java.awt.geom.AffineTransform-)  
    * #### setAreaOfInterest  
    public void setAreaOfInterest([Shape](../../../../java/awt/Shape.html "interface in java.awt") newAoi)  
    Sets the current area of interest. The old area is discarded.  
    Parameters:  
    `newAoi` \- The new area of interest.  
    See Also:  
    [getAreaOfInterest()](../../../../java/awt/image/renderable/RenderContext.html#getAreaOfInterest--)  
    * #### getAreaOfInterest  
    public [Shape](../../../../java/awt/Shape.html "interface in java.awt") 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)](../../../../java/awt/image/renderable/RenderContext.html#setAreaOfInterest-java.awt.Shape-)  
    * #### clone  
    public [Object](../../../../java/lang/Object.html "class in java.lang") 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](../../../../java/lang/Object.html#clone--)` in class `[Object](../../../../java/lang/Object.html "class in java.lang")`  
    Returns:  
    the new cloned RenderContext.  
    See Also:  
    [Cloneable](../../../../java/lang/Cloneable.html "interface in java.lang")

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