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java.lang.Object javax.media.jai.OperationDescriptorImpl javax.media.jai.operator.ShearDescriptor
An OperationDescriptor
describing the "Shear" operation.
The "Shear" operation shears an image either horizontally or vertically. For each pixel (x, y) of the destination, the source value at the fractional subpixel position (x', y') is constructed by means of an Interpolation object and written to the destination.
If the "shearDir" parameter is equal to SHEAR_HORIZONTAL
then x' = (x - xTrans - y*shear)
and y' = y
.
If the "shearDir" parameter is equal to SHEAR_VERTICAL
then x' = x
and y' = (y - yTrans - x*shear)
.
The parameter, "backgroundValues", is defined to
fill the background with the user-specified background
values. These background values will be translated into background
colors by the ColorModel
when the image is displayed.
With the default value, {0.0}
, of this parameter,
the background pixels are filled with 0s. If the provided array
length is smaller than the number of bands, the first element of
the provided array is used for all the bands. If the provided values
are out of the data range of the destination image, they will be clamped
into the proper range.
It may be noted that the minX, minY, width and height hints as
specified through the JAI.KEY_IMAGE_LAYOUT
hint in the
RenderingHints
object are not honored, as this operator
calculates the destination image bounds itself. The other
ImageLayout
hints, like tileWidth and tileHeight,
however are honored.
It should be noted that this operation automatically adds a
value of Boolean.TRUE
for the
JAI.KEY_REPLACE_INDEX_COLOR_MODEL
to the given
configuration
so that the operation is performed
on the pixel values instead of being performed on the indices into
the color map if the source(s) have an IndexColorModel
.
This addition will take place only if a value for the
JAI.KEY_REPLACE_INDEX_COLOR_MODEL
has not already been
provided by the user. Note that the configuration
Map
is cloned before the new hint is added to it. The operation can be
smart about the value of the JAI.KEY_REPLACE_INDEX_COLOR_MODEL
RenderingHints
, i.e. while the default value for the
JAI.KEY_REPLACE_INDEX_COLOR_MODEL
is
Boolean.TRUE
, in some cases the operator could set the
default.
"Shear" defines a PropertyGenerator that performs an identical
transformation on the "ROI" property of the source image, which can
be retrieved by calling the getProperty
method with
"ROI" as the property name.
Name | Value |
---|---|
GlobalName | shear |
LocalName | shear |
Vendor | com.sun.media.jai |
Description | Shears an image. |
DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ShearDescriptor.html |
Version | 1.0 |
arg0Desc | The shear value. |
arg1Desc | The shear direction. |
arg2Desc | The X translation. |
arg3Desc | The Y translation. |
arg4Desc | The interpolation method for resampling. |
Name | Class Type | Default Value |
---|---|---|
shear | java.lang.Float | 0.0F |
shearDir | javax.media.jai.operator.ShearDir | SHEAR_HORIZONTAL |
xTrans | java.lang.Float | 0.0F |
yTrans | java.lang.Float | 0.0F |
interpolation | javax.media.jai.Interpolation | InterpolationNearest |
backgroundValues | double[] | {0.0} |
Interpolation
,
OperationDescriptor
,
ShearDir
,
Serialized FormField Summary | |
static ShearDir |
SHEAR_HORIZONTAL
|
static ShearDir |
SHEAR_VERTICAL
|
Fields inherited from class javax.media.jai.OperationDescriptorImpl |
sourceNames, supportedModes |
Fields inherited from interface javax.media.jai.OperationDescriptor |
NO_PARAMETER_DEFAULT |
Constructor Summary | |
ShearDescriptor()
Constructor. |
Method Summary | |
static RenderedOp |
create(RenderedImage source0,
Float shear,
ShearDir shearDir,
Float xTrans,
Float yTrans,
Interpolation interpolation,
double[] backgroundValues,
RenderingHints hints)
Shears an image. |
PropertyGenerator[] |
getPropertyGenerators()
Returns an array of PropertyGenerators implementing
property inheritance for the "Shear" operation. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public static final ShearDir SHEAR_HORIZONTAL
public static final ShearDir SHEAR_VERTICAL
Constructor Detail |
public ShearDescriptor()
Method Detail |
public PropertyGenerator[] getPropertyGenerators()
PropertyGenerators
implementing
property inheritance for the "Shear" operation.
getPropertyGenerators
in interface OperationDescriptor
getPropertyGenerators
in class OperationDescriptorImpl
OperationDescriptorImpl.getPropertyGenerators(java.lang.String)
public static RenderedOp create(RenderedImage source0, Float shear, ShearDir shearDir, Float xTrans, Float yTrans, Interpolation interpolation, double[] backgroundValues, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.create(String,ParameterBlock,RenderingHints)
.
source0
- RenderedImage
source 0.shear
- The shear value.
May be null
.shearDir
- The shear direction.
May be null
.xTrans
- The X translation.
May be null
.yTrans
- The Y translation.
May be null
.interpolation
- The interpolation method for resampling.
May be null
.backgroundValues
- The user-specified background values.
May be null
.hints
- The RenderingHints
to use.
May be null
.
RenderedOp
destination.
IllegalArgumentException
- if source0
is null
.JAI
,
ParameterBlockJAI
,
RenderedOp
|
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