com.bbn.openmap.omGraphics
Class OMRasterObject.TrimScaleFilter

java.lang.Object
  java.awt.image.ImageFilter
      java.awt.image.ReplicateScaleFilter
          java.awt.image.AreaAveragingScaleFilter
              com.bbn.openmap.omGraphics.OMRasterObject.TrimScaleFilter

All Implemented Interfaces:

java.awt.image.ImageConsumer, java.lang.Cloneable

Enclosing class:

OMRasterObject

protected class OMRasterObject.TrimScaleFilter
extends java.awt.image.AreaAveragingScaleFilter

This is an effort to create an scaling ImageFilter that will trim off the unused pixels, lessoning the load on the display server. It depends on knowing several things about the projection and the current image parameters, which is why it's not a stand-alone filter class.

Field Summary

Fields inherited from class java.awt.image.ReplicateScaleFilter

destHeight, destWidth, outpixbuf, srccols, srcHeight, srcrows, srcWidth

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

	OMRasterObject.TrimScaleFilter(int width, int height) Constructs an TrimScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.
protected	OMRasterObject.TrimScaleFilter(int width, int height, int algorithmType) Constructs an AreaAveragingScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

Method Summary

protected java.awt.image.ImageFilter	getFilterWithChanges() The filter must change if the requested image size changes because of clipping.
void	setHints(int hints) Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.
protected java.awt.Image	trimExcessPixels() Get a trimmed-down image to expand to the map, that contains all the pixels that will be visible after expansion.

Methods inherited from class java.awt.image.AreaAveragingScaleFilter

setPixels, setPixels

Methods inherited from class java.awt.image.ReplicateScaleFilter

setDimensions, setProperties

Methods inherited from class java.awt.image.ImageFilter

clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModel

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OMRasterObject.TrimScaleFilter

public OMRasterObject.TrimScaleFilter(int width,
                                      int height)

Constructs an TrimScaleFilter 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

OMRasterObject.TrimScaleFilter

protected OMRasterObject.TrimScaleFilter(int width,
                                         int height,
                                         int algorithmType)

Constructs an AreaAveragingScaleFilter 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

algorithmType - FAST_SCALING or SMOOTH_SCALING - FAST is much faster!

Method Detail

setHints

public void setHints(int hints)

Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work. If the algorithmType is set to FAST, I manipulate the hints to force the filter to act like a ReplicateScaleFilter.

Specified by:

setHints in interface java.awt.image.ImageConsumer

Overrides:

setHints in class java.awt.image.AreaAveragingScaleFilter

See Also:

ImageConsumer.setHints(int)

getFilterWithChanges

protected java.awt.image.ImageFilter getFilterWithChanges()

The filter must change if the requested image size changes because of clipping. Get the good filter here, after calling trimExcessPixels().

trimExcessPixels

protected java.awt.Image trimExcessPixels()

Get a trimmed-down image to expand to the map, that contains all the pixels that will be visible after expansion. Returns null if the image should be used as is, and the filter as well.