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## java.awt.image
Class ReplicateScaleFilter

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

All Implemented Interfaces:
  Cloneable, ImageConsumer

Direct Known 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[]` | `srccols` An `int` array containing information about a column of pixels.
`protected int` | `srcHeight` The height of the source image.
`protected int[]` | `srcrows` An `int` array containing information about a row of pixels.
`protected int` | `srcWidth` The width of the source image.

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, byte[] 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, int[] 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, setHints`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### srcWidth

    protected int srcWidth

  The width of the source image.

### srcHeight

    protected int srcHeight

  The height of the source image.

### destWidth

    protected int destWidth

  The target width to scale the image.

### destHeight

    protected int destHeight

  The target height to scale the image.

### srcrows

    protected int[] srcrows

  An `int` array containing information about a row of pixels.

### srccols

    protected int[] srccols

  An `int` array containing information about a column of pixels.

### 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`.

Constructor Detail

### 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

Method Detail

### setProperties

    public void setProperties(Hashtable props)

  Passes along the properties from the source object after adding a property indicating the scale applied.

  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 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 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)

  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 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)

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

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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.