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CropImageFilter (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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JavaTM 2 Platform
Std. Ed. v1.4.1
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java.awt.image
Class CropImageFilter

java.lang.Object
  |
  +--java.awt.image.ImageFilter
        |
        +--java.awt.image.CropImageFilter
All Implemented Interfaces:
Cloneable, ImageConsumer
public class CropImageFilter
extends ImageFilter

An ImageFilter class for cropping images. This class extends the basic ImageFilter Class to extract a given rectangular region of an existing Image and provide a source for a new image containing just the extracted region. It is meant to be used in conjunction with a FilteredImageSource object to produce cropped versions of existing images.

See Also:
FilteredImageSource, ImageFilter

Field Summary
 
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
CropImageFilter(int x, int y, int w, int h)
          Constructs a CropImageFilter that extracts the absolute rectangular region of pixels from its source Image as specified by the x, y, w, and h parameters.
 
Method Summary
 void setDimensions(int w, int h)
          Override the source image's dimensions and pass the dimensions of the rectangular cropped region to the ImageConsumer.
 void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)
          Determine whether the delivered byte pixels intersect the region to be extracted and passes through only that subset of pixels that appear in the output region.
 void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)
          Determine if the delivered int pixels intersect the region to be extracted and pass through only that subset of pixels that appear in the output region.
 void setProperties(Hashtable props)
          Passes along the properties from the source object after adding a property indicating the cropped region.
 
Methods inherited from class java.awt.image.ImageFilter
clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModel, setHints
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CropImageFilter

public CropImageFilter(int x,
                       int y,
                       int w,
                       int h)
Constructs a CropImageFilter that extracts the absolute rectangular region of pixels from its source Image as specified by the x, y, w, and h parameters.

Parameters:
x - the x location of the top of the rectangle to be extracted
y - the y location of the top of the rectangle to be extracted
w - the width of the rectangle to be extracted
h - the height of the rectangle to be extracted
Method Detail

setProperties

public void setProperties(Hashtable props)
Passes along the properties from the source object after adding a property indicating the cropped region.

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 class ImageFilter
Parameters:
props - the list of properties to be associated with this image

setDimensions

public void setDimensions(int w,
                          int h)
Override the source image's dimensions and pass the dimensions of the rectangular cropped region 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 class ImageFilter
See Also:
ImageConsumer

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      byte[] pixels,
                      int off,
                      int scansize)
Determine whether the delivered byte pixels intersect the region to be extracted and passes through only that subset of pixels that appear in the output region.

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 class ImageFilter
See Also:
ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      ColorModel model,
                      int[] pixels,
                      int off,
                      int scansize)
Determine if the delivered int pixels intersect the region to be extracted and pass through only that subset of pixels that appear in the output region.

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 class ImageFilter
See Also:
ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)
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JavaTM 2 Platform
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.