java/11 : java.desktop/java/awt/image/renderable/RenderContext.java

RenderContext
https://openjdk.java.net/
GPLv2 + Classpath Exception
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 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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/* ********************************************************************
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 *** COPYRIGHT (c) Eastman Kodak Company, 1997                      ***
 *** As  an unpublished  work pursuant to Title 17 of the United    ***
 *** States Code.  All rights reserved.                             ***
 **********************************************************************
 **********************************************************************
 **********************************************************************/

package java.awt.image.renderable;
import java.util.*;
import java.awt.geom.*;
import java.awt.*;
import java.awt.image.*;

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.
/**
 * 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.
 *
 * <p> 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.
 *
 * <p> 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.
 */
public class RenderContext implements Cloneable {

    Table of hints. May be null. /** Table of hints. May be null. */
    RenderingHints hints;

    Transform to convert user coordinates to device coordinates.  /** Transform to convert user coordinates to device coordinates.  */
    AffineTransform usr2dev;

    The area of interest.  May be null. /** The area of interest.  May be null. */
    Shape aoi;

    // Various constructors that allow different levels of
    // specificity. If the Shape is missing the whole renderable area
    // is assumed. If hints is missing no hints are assumed.

    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.
Params: usr2dev – an AffineTransform.
aoi – a Shape representing the area of interest.
hints – a RenderingHints object containing rendering 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.
     *
     * @param usr2dev an AffineTransform.
     * @param aoi a Shape representing the area of interest.
     * @param hints a RenderingHints object containing rendering hints.
     */
    public RenderContext(AffineTransform usr2dev,
                         Shape aoi,
                         RenderingHints hints) {
        this.hints = hints;
        this.aoi = aoi;
        this.usr2dev = (AffineTransform)usr2dev.clone();
    }

    Constructs a RenderContext with a given transform.
The area of interest is taken to be the entire renderable area.
No rendering hints are used.
Params: usr2dev – an AffineTransform./**
     * Constructs a RenderContext with a given transform.
     * The area of interest is taken to be the entire renderable area.
     * No rendering hints are used.
     *
     * @param usr2dev an AffineTransform.
     */
    public RenderContext(AffineTransform usr2dev) {
        this(usr2dev, null, null);
    }

    Constructs a RenderContext with a given transform and rendering hints.
The area of interest is taken to be the entire renderable area.
Params: usr2dev – an AffineTransform.
hints – a RenderingHints object containing rendering hints./**
     * Constructs a RenderContext with a given transform and rendering hints.
     * The area of interest is taken to be the entire renderable area.
     *
     * @param usr2dev an AffineTransform.
     * @param hints a RenderingHints object containing rendering hints.
     */
    public RenderContext(AffineTransform usr2dev, RenderingHints hints) {
        this(usr2dev, null, hints);
    }

    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.
Params: usr2dev – an AffineTransform.
aoi – a Shape representing the area of interest./**
     * 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.
     *
     * @param usr2dev an AffineTransform.
     * @param aoi a Shape representing the area of interest.
     */
    public RenderContext(AffineTransform usr2dev, Shape aoi) {
        this(usr2dev, aoi, null);
    }

    Gets the rendering hints of this RenderContext. 
See Also: setRenderingHints(RenderingHints)
Returns: a RenderingHints object that represents the rendering hints of this RenderContext./**
     * Gets the rendering hints of this {@code RenderContext}.
     * @return a {@code RenderingHints} object that represents
     * the rendering hints of this {@code RenderContext}.
     * @see #setRenderingHints(RenderingHints)
     */
    public RenderingHints getRenderingHints() {
        return hints;
    }

    Sets the rendering hints of this RenderContext. 
Params: hints – a RenderingHints object that represents the rendering hints to assign to this RenderContext.
See Also: getRenderingHints/**
     * Sets the rendering hints of this {@code RenderContext}.
     * @param hints a {@code RenderingHints} object that represents
     * the rendering hints to assign to this {@code RenderContext}.
     * @see #getRenderingHints
     */
    public void setRenderingHints(RenderingHints hints) {
        this.hints = hints;
    }

    Sets the current user-to-device AffineTransform contained
in the RenderContext to a given transform.
Params: newTransform – the new AffineTransform.
See Also: getTransform/**
     * Sets the current user-to-device AffineTransform contained
     * in the RenderContext to a given transform.
     *
     * @param newTransform the new AffineTransform.
     * @see #getTransform
     */
    public void setTransform(AffineTransform newTransform) {
        usr2dev = (AffineTransform)newTransform.clone();
    }

    Modifies the current user-to-device transform by prepending another
transform.  In matrix notation the operation is:
[this] = [modTransform] x [this]

Params: modTransform – the AffineTransform to prepend to the
       current usr2dev transform.
Since: 1.3/**
     * Modifies the current user-to-device transform by prepending another
     * transform.  In matrix notation the operation is:
     * <pre>
     * [this] = [modTransform] x [this]
     * </pre>
     *
     * @param modTransform the AffineTransform to prepend to the
     *        current usr2dev transform.
     * @since 1.3
     */
    public void preConcatenateTransform(AffineTransform modTransform) {
        this.preConcetenateTransform(modTransform);
    }

    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.
Params: modTransform – the AffineTransform to prepend to the
       current usr2dev transform.
Deprecated:  replaced by preConcatenateTransform(AffineTransform)./**
     * Modifies the current user-to-device transform by prepending another
     * transform.  In matrix notation the operation is:
     * <pre>
     * [this] = [modTransform] x [this]
     * </pre>
     * This method does the same thing as the preConcatenateTransform
     * method.  It is here for backward compatibility with previous releases
     * which misspelled the method name.
     *
     * @param modTransform the AffineTransform to prepend to the
     *        current usr2dev transform.
     * @deprecated     replaced by
     *                 {@code preConcatenateTransform(AffineTransform)}.
     */
    @Deprecated
    public void preConcetenateTransform(AffineTransform modTransform) {
        usr2dev.preConcatenate(modTransform);
    }

    Modifies the current user-to-device transform by appending another
transform.  In matrix notation the operation is:
[this] = [this] x [modTransform]

Params: modTransform – the AffineTransform to append to the
       current usr2dev transform.
Since: 1.3/**
     * Modifies the current user-to-device transform by appending another
     * transform.  In matrix notation the operation is:
     * <pre>
     * [this] = [this] x [modTransform]
     * </pre>
     *
     * @param modTransform the AffineTransform to append to the
     *        current usr2dev transform.
     * @since 1.3
     */
    public void concatenateTransform(AffineTransform modTransform) {
        this.concetenateTransform(modTransform);
    }

    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.
Params: modTransform – the AffineTransform to append to the
       current usr2dev transform.
Deprecated:  replaced by concatenateTransform(AffineTransform)./**
     * Modifies the current user-to-device transform by appending another
     * transform.  In matrix notation the operation is:
     * <pre>
     * [this] = [this] x [modTransform]
     * </pre>
     * This method does the same thing as the concatenateTransform
     * method.  It is here for backward compatibility with previous releases
     * which misspelled the method name.
     *
     * @param modTransform the AffineTransform to append to the
     *        current usr2dev transform.
     * @deprecated     replaced by
     *                 {@code concatenateTransform(AffineTransform)}.
     */
    @Deprecated
    public void concetenateTransform(AffineTransform modTransform) {
        usr2dev.concatenate(modTransform);
    }

    Gets the current user-to-device AffineTransform.
See Also: setTransform(AffineTransform)
Returns: a reference to the current AffineTransform./**
     * Gets the current user-to-device AffineTransform.
     *
     * @return a reference to the current AffineTransform.
     * @see #setTransform(AffineTransform)
     */
    public AffineTransform getTransform() {
        return (AffineTransform)usr2dev.clone();
    }

    Sets the current area of interest.  The old area is discarded.
Params: newAoi – The new area of interest.
See Also: getAreaOfInterest/**
     * Sets the current area of interest.  The old area is discarded.
     *
     * @param newAoi The new area of interest.
     * @see #getAreaOfInterest
     */
    public void setAreaOfInterest(Shape newAoi) {
        aoi = newAoi;
    }

    Gets the ares of interest currently contained in the
RenderContext.
See Also: setAreaOfInterest(Shape)
Returns: a reference to the area of interest of the RenderContext,
        or null if none is specified./**
     * Gets the ares of interest currently contained in the
     * RenderContext.
     *
     * @return a reference to the area of interest of the RenderContext,
     *         or null if none is specified.
     * @see #setAreaOfInterest(Shape)
     */
    public Shape getAreaOfInterest() {
        return aoi;
    }

    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./**
     * 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.
     *
     * @return the new cloned RenderContext.
     */
    public Object clone() {
        RenderContext newRenderContext = new RenderContext(usr2dev,
                                                           aoi, hints);
        return newRenderContext;
    }
}
See Also:	setRenderingHints(RenderingHints)
Returns:	a `RenderingHints` object that represents the rendering hints of this `RenderContext`.
Params:	hints – a `RenderingHints` object that represents the rendering hints to assign to this `RenderContext`.
See Also:	getRenderingHints
Params:	newTransform – the new AffineTransform.
See Also:	getTransform
Params:	modTransform – the AffineTransform to prepend to the current usr2dev transform.
Since:	1.3
Params:	modTransform – the AffineTransform to prepend to the current usr2dev transform.
Deprecated:	replaced by `preConcatenateTransform(AffineTransform)`.
Params:	modTransform – the AffineTransform to append to the current usr2dev transform.
Since:	1.3
See Also:	setTransform(AffineTransform)
Returns:	a reference to the current AffineTransform.
Params:	newAoi – The new area of interest.
See Also:	getAreaOfInterest
See Also:	setAreaOfInterest(Shape)
Returns:	a reference to the area of interest of the RenderContext, or null if none is specified.
/

java/ 11/ java.desktop/java/awt/image/renderable/RenderContext.java
