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

All Implemented Interfaces:

ImageConsumer, Cloneable

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

Fields
Modifier and Type	Field and Description
`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.

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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

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

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Method Summary

Methods
Modifier and Type	Method and Description
`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.

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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. 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 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
    
    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)
    
    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
    
    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)
    
    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
    
    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)

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/awt/image/ReplicateScaleFilter.html

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References

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Class ReplicateScaleFilter

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