java.awt.image

Class ReplicateScaleFilter

Implemented Interfaces:
Cloneable, ImageConsumer
Known Direct Subclasses:
AreaAveragingScaleFilter

public class ReplicateScaleFilter
extends ImageFilter

An ImageFilter class for scaling images using the simplest algorithm. This class extends the basic ImageFilter Class to scale an existing image and provide a source for a new image containing the resampled image. The pixels in the source image are sampled to produce pixels for an image of the specified size by replicating rows and columns of pixels to scale up or omitting rows and columns of pixels to scale down.

It is meant to be used in conjunction with a FilteredImageSource object to produce scaled versions of existing images. Due to implementation dependencies, there may be differences in pixel values of an image filtered on different platforms.

See Also:
FilteredImageSource, ImageFilter

Field Summary

protected int
destHeight
The target height to scale the image.
protected int
destWidth
The target width to scale the image.
protected Object
outpixbuf
A byte array initialized with a size of destWidth and used to deliver a row of pixel data to the ImageConsumer.
protected int
srcHeight
The height of the source image.
protected int
srcWidth
The width of the source image.
protected int[]
srccols
An int array containing information about a column of pixels.
protected int[]
srcrows
An int array containing information about a row of pixels.

Fields inherited from class java.awt.image.ImageFilter

consumer

Fields inherited from interface java.awt.image.ImageConsumer

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

Constructor Summary

ReplicateScaleFilter(int width, int height)
Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

Method Summary

void
setDimensions(int w, int h)
Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.
void
setPixels(int x, int y, int w, int h, ColorModel model, pixels[] , int off, int scansize)
Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
void
setPixels(int x, int y, int w, int h, ColorModel model, pixels[] , int off, int scansize)
Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.
void
setProperties(Hashtable props)
Passes along the properties from the source object after adding a property indicating the scale applied.

Methods inherited from class java.awt.image.ImageFilter

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

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

destHeight

protected int destHeight
The target height to scale the image.

destWidth

protected int destWidth
The target width to scale the image.

outpixbuf

protected Object outpixbuf
A byte array initialized with a size of destWidth and used to deliver a row of pixel data to the ImageConsumer.

srcHeight

protected int srcHeight
The height of the source image.

srcWidth

protected int srcWidth
The width of the source image.

srccols

protected int[] srccols
An int array containing information about a column of pixels.

srcrows

protected int[] srcrows
An int array containing information about a row of pixels.

Constructor Details

ReplicateScaleFilter

public ReplicateScaleFilter(int width,
                            int height)
Constructs a ReplicateScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.
Parameters:
width - the target width to scale the image
height - the target height to scale the image
Throws:
IllegalArgumentException - if width equals zero or height equals zero
Usages and Demos :

View More Examples of ReplicateScaleFilter(int width,int height)
   1:           new FilteredImageSource(this.getSource(),
   2:                                   new ReplicateScaleFilter(width, height));
   3:         return Toolkit.getDefaultToolkit().createImage(producer);
   4:       case SCALE_SMOOTH:
   5:       case SCALE_AREA_AVERAGING:

View Full Code Here

Method Details

setDimensions

public void setDimensions(int w,
                          int h)
Override the dimensions of the source image and pass the dimensions of the new scaled size to the ImageConsumer.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Specified by:
setDimensions in interface ImageConsumer
Overrides:
setDimensions in interface ImageFilter
See Also:
ImageConsumer

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      pixels[] ,
                      int off,
                      int scansize)
Choose which rows and columns of the delivered byte pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Specified by:
setPixels in interface ImageConsumer
Overrides:
setPixels in interface ImageFilter

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      pixels[] ,
                      int off,
                      int scansize)
Choose which rows and columns of the delivered int pixels are needed for the destination scaled image and pass through just those rows and columns that are needed, replicated as necessary.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Specified by:
setPixels in interface ImageConsumer
Overrides:
setPixels in interface ImageFilter

setProperties

public void setProperties(Hashtable props)
Passes along the properties from the source object after adding a property indicating the scale applied. This method invokes super.setProperties, which might result in additional properties being added.

Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.

Specified by:
setProperties in interface ImageConsumer
Overrides:
setProperties in interface ImageFilter