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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class CropImageFilter - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt.image
Class CropImageFilter

java.lang.Object
  |
  +--java.awt.image.ImageFilter
        |
        +--java.awt.image.CropImageFilter
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

Fields inherited from class java.awt.image.ImageFilter
consumer
 
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.
Overrides:
setProperties in class ImageFilter

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.
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.
Overrides:
setPixels in class ImageFilter
Tags copied from 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.
Overrides:
setPixels in class ImageFilter
Tags copied from class: ImageFilter
See Also:
ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)
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