Class GrayFilter

java.lang.Object

java.awt.image.ImageFilter

java.awt.image.RGBImageFilter

javax.swing.GrayFilter

All Implemented Interfaces:

ImageConsumer, Cloneable

public class GrayFilter
extends RGBImageFilter

An image filter that "disables" an image by turning it into a grayscale image, and brightening the pixels in the image. Used by buttons to create an image for a disabled button.

Since:

1.2

Field Summary

Fields declared in class RGBImageFilter

canFilterIndexColorModel, newmodel, origmodel

Modifier and Type	Field	Description
protected boolean	canFilterIndexColorModel	This boolean indicates whether or not it is acceptable to apply the color filtering of the filterRGB method to the color table entries of an IndexColorModel object in lieu of pixel by pixel filtering.
protected ColorModel	newmodel	The ColorModel with which to replace origmodel when the user calls substituteColorModel.
protected ColorModel	origmodel	The ColorModel to be replaced by newmodel when the user calls substituteColorModel.

Fields declared in class ImageFilter

consumer

Modifier and Type	Field	Description
protected ImageConsumer	consumer	The consumer of the particular image data stream for which this instance of the ImageFilter is filtering data.

Fields declared in interface ImageConsumer

COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT

Modifier and Type	Field	Description
static final int	COMPLETESCANLINES	The pixels will be delivered in (multiples of) complete scanlines at a time.
static final int	IMAGEABORTED	The image creation process was deliberately aborted.
static final int	IMAGEERROR	An error was encountered while producing the image.
static final int	RANDOMPIXELORDER	The pixels will be delivered in a random order.
static final int	SINGLEFRAME	The image contain a single static image.
static final int	SINGLEFRAMEDONE	One frame of the image is complete but there are more frames to be delivered.
static final int	SINGLEPASS	The pixels will be delivered in a single pass.
static final int	STATICIMAGEDONE	The image is complete and there are no more pixels or frames to be delivered.
static final int	TOPDOWNLEFTRIGHT	The pixels will be delivered in top-down, left-to-right order.

Constructor Summary

Constructors

Constructor	Description
GrayFilter(boolean b, int p)	Constructs a GrayFilter object that filters a color image to a grayscale image.

Method Summary

Modifier and Type	Method	Description
static Image	createDisabledImage(Image i)	Creates a disabled image
int	filterRGB(int x, int y, int rgb)	Overrides RGBImageFilter.filterRGB.

Methods declared in class RGBImageFilter

filterIndexColorModel, filterRGBPixels, setColorModel, setPixels, setPixels, substituteColorModel

Modifier and Type	Method	Description
IndexColorModel	filterIndexColorModel(IndexColorModel icm)	Filters an IndexColorModel object by running each entry in its color tables through the filterRGB function that RGBImageFilter subclasses must provide.
void	filterRGBPixels(int x, int y, int w, int h, int[] pixels, int off, int scansize)	Filters a buffer of pixels in the default RGB ColorModel by passing them one by one through the filterRGB method.
void	setColorModel(ColorModel model)	If the ColorModel is an IndexColorModel and the subclass has set the canFilterIndexColorModel flag to true, we substitute a filtered version of the color model here and wherever that original ColorModel object appears in the setPixels methods.
void	setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)	If the ColorModel object is the same one that has already been converted, then simply passes the pixels through with the converted ColorModel.
void	setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)	If the ColorModel object is the same one that has already been converted, then simply passes the pixels through with the converted ColorModel, otherwise converts the buffer of integer pixels to the default RGB ColorModel and passes the converted buffer to the filterRGBPixels method to be converted one by one.
void	substituteColorModel(ColorModel oldcm, ColorModel newcm)	Registers two ColorModel objects for substitution.

Methods declared in class ImageFilter

clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setDimensions, setHints, setProperties

Modifier and Type	Method	Description
Object	clone()	Clones this object.
ImageFilter	getFilterInstance(ImageConsumer ic)	Returns a unique instance of an ImageFilter object which will actually perform the filtering for the specified ImageConsumer.
void	imageComplete(int status)	Filters the information provided in the imageComplete method of the ImageConsumer interface.
void	resendTopDownLeftRight(ImageProducer ip)	Responds to a request for a TopDownLeftRight (TDLR) ordered resend of the pixel data from an ImageConsumer.
void	setDimensions(int width, int height)	Filters the information provided in the setDimensions method of the ImageConsumer interface.
void	setHints(int hints)	Filters the information provided in the setHints method of the ImageConsumer interface.
void	setProperties(Hashtable<?,?> props)	Passes the properties from the source object along after adding a property indicating the stream of filters it has been run through.

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

GrayFilter

public GrayFilter(boolean b,
 int p)

Constructs a GrayFilter object that filters a color image to a grayscale image. Used by buttons to create disabled ("grayed out") button images.

Parameters:

b - a boolean -- true if the pixels should be brightened

p - an int in the range 0..100 that determines the percentage of gray, where 100 is the darkest gray, and 0 is the lightest

Method Details

createDisabledImage

public static Image createDisabledImage(Image i)

Creates a disabled image

Parameters:

i - an Image to be created as disabled

Returns:

the new grayscale image created from i

filterRGB

public int filterRGB(int x,
 int y,
 int rgb)

Overrides RGBImageFilter.filterRGB.

Specified by:

filterRGB in class RGBImageFilter

Parameters:

x - the X coordinate of the pixel

y - the Y coordinate of the pixel

rgb - the integer pixel representation in the default RGB color model

Returns:

a filtered pixel in the default RGB color model.

See Also:

• ColorModel.getRGBdefault()
• RGBImageFilter.filterRGBPixels(int, int, int, int, int[], int, int)