Java java.awt.image Class CropImageFilter（JDK8）

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. 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 class ImageFilter

  Parameters:

  props - the properties from the source object

• 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

  Parameters:

  w - the width of the source image

  h - the height of the source image

  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

  Parameters:

  x - the X coordinate of the upper-left corner of the area of pixels to be set

  y - the Y coordinate of the upper-left corner of the area of pixels to be set

  w - the width of the area of pixels

  h - the height of the area of pixels

  model - the specified ColorModel

  pixels - the array of pixels

  off - the offset into the pixels array

  scansize - the distance from one row of pixels to the next in the pixels array

  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

  Parameters:

  x - the X coordinate of the upper-left corner of the area of pixels to be set

  y - the Y coordinate of the upper-left corner of the area of pixels to be set

  w - the width of the area of pixels

  h - the height of the area of pixels

  model - the specified ColorModel

  pixels - the array of pixels

  off - the offset into the pixels array

  scansize - the distance from one row of pixels to the next in the pixels array

  See Also:

  ImageConsumer.setPixels(int, int, int, int, java.awt.image.ColorModel, byte[], int, int)