public class GeneralGridEnvelope extends Object implements GridEnvelope, Serializable
CAUTION: ISO 19123 defines high coordinates as
inclusive. We follow this specification for all getters methods, but keep in
mind that this is the opposite of Java2D usage where Rectangle
maximal values are
exclusive. When the context is ambiguous, an explicit isHighIncluded
argument is
required.
GridEnvelope2D
,
Serialized FormConstructor and Description 

GeneralGridEnvelope(Envelope envelope,
PixelInCell anchor)
Casts the specified envelope into a grid envelope.

GeneralGridEnvelope(Envelope envelope,
PixelInCell anchor,
boolean isHighIncluded)
Casts the specified envelope into a grid envelope.

GeneralGridEnvelope(GridEnvelope envelope)
Creates a new grid envelope as a copy of the given one.

GeneralGridEnvelope(int[] low,
int[] high)
Constructs a new grid envelope.

GeneralGridEnvelope(int[] low,
int[] high,
boolean isHighIncluded)
Constructs a new grid envelope.

GeneralGridEnvelope(Raster raster,
int dimension)
Constructs multidimensional grid envelope defined by a
Raster . 
GeneralGridEnvelope(Rectangle rect)
Constructs a 2D grid envelope defined by a
Rectangle . 
GeneralGridEnvelope(Rectangle rect,
int dimension)
Constructs a multidimensional grid envelope defined by a
Rectangle . 
GeneralGridEnvelope(RenderedImage image,
int dimension)
Constructs multidimensional grid envelope defined by a
RenderedImage . 
Modifier and Type  Method and Description 

boolean 
equals(Object object)
Compares the specified object with this grid envelope for equality.

int 
getDimension()
Returns the number of dimensions.

GridCoordinates 
getHigh()
Returns the valid maximum inclusive grid coordinates.

int 
getHigh(int dimension)
Returns the valid maximum inclusive grid coordinate along the specified
dimension.

GridCoordinates 
getLow()
Returns the valid minimum inclusive grid coordinates.

int 
getLow(int dimension)
Returns the valid minimum inclusive grid coordinate along the specified dimension.

int 
getSpan(int dimension)
Returns the number of integer grid coordinates along the specified dimension.

GeneralGridEnvelope 
getSubGridEnvelope(int lower,
int upper)
Returns a new grid envelope that encompass only some dimensions of this grid envelope.

int 
hashCode()
Returns a hash value for this grid envelope.

Rectangle 
toRectangle()
Returns a
Rectangle with the same bounds as this GeneralGridEnvelope . 
String 
toString()
Returns a string représentation of this grid envelope.

public GeneralGridEnvelope(GridEnvelope envelope)
envelope
 The grid envelope to copy.public GeneralGridEnvelope(Rectangle rect, int dimension)
Rectangle
. The two first
dimensions are set to the [x .. x+width1] and [y .. y+height1]
inclusive ranges respectively. Extra dimensions (if any) are set to the [0..0] inclusive
range.
Notice that this method ensure interoperability between Raster
dimensions in
Java2D style and GridEnvelope
dimensions in ISO 19123 style providing that the user
remember to add 1 to the GridEnvelope.getHigh(int)
values.
rect
 The grid coordinates as a rectangle.dimension
 Number of dimensions for this grid envelope. Must be equals or greater than
2.public GeneralGridEnvelope(Rectangle rect)
Rectangle
. The 2 dimensions are set to the
[x .. x+width1] and [y .. y+height1] inclusive ranges respectively.
Notice that this method ensure interoperability between Raster
dimensions in
Java2D style and GridEnvelope
dimensions in ISO 19123 style providing that the user
remember to add 1 to the GridEnvelope.getHigh(int)
values.
rect
 The grid coordinates as a rectangle.public GeneralGridEnvelope(Raster raster, int dimension)
Raster
. The two first
dimensions are set to the [x .. x+width1] and [y .. y+height1]
inclusive ranges respectively. Extra dimensions (if any) are set to the [0..0] inclusive
range.
Notice that this method ensure interoperability between Raster
dimensions in
Java2D style and GridEnvelope
dimensions in ISO 19123 style providing that the user
remember to add 1 to the GridEnvelope.getHigh(int)
values.
raster
 The raster for which to construct a grid envelope.dimension
 Number of dimensions for this grid envelope. Must be equals or greater than
2.public GeneralGridEnvelope(RenderedImage image, int dimension)
RenderedImage
. The two first
dimensions are set to the [x .. x+width1] and [y .. y+height1] inclusive ranges respectively. Extra dimensions (if any)
are set to the [0..0] inclusive range.
Notice that this method ensure interoperability between Raster
dimensions in
Java2D style and GridEnvelope
dimensions in ISO 19123 style providing that the user
remember to add 1 to the GridEnvelope.getHigh(int)
values.
image
 The image for which to construct a grid envelope.dimension
 Number of dimensions for this grid envelope. Must be equals or greater than
2.public GeneralGridEnvelope(Envelope envelope, PixelInCell anchor) throws IllegalArgumentException
Notice that highest values are interpreted as noninclusive
Anchor
According OpenGIS specification, grid
geometry maps pixel's center. But envelopes typically encompass all pixels. This means that
grid coordinates (0,0) has an envelope starting at (0.5, 0.5). In order to revert back such
envelope to a grid envelope, it is necessary to add 0.5 to every coordinates (including the
maximum value since it is exclusive in a grid envelope). This offset is applied only if
anchor
is PixelInCell.CELL_CENTER
. Users who don't want such offset should
specify PixelInCell.CELL_CORNER
.
The convention is specified as a PixelInCell
code instead than the more detailed
PixelOrientation
because the latter is restricted to the
twodimensional case while the former can be used for any number of dimensions.
envelope
 The envelope to use for initializing this grid envelope.anchor
 Whatever envelope coordinates map to pixel center or pixel corner. Should be
PixelInCell.CELL_CENTER
for OGC convention (an offset of 0.5 will be added to
every envelope coordinate values), or PixelInCell.CELL_CORNER
for Java2D/JAI
convention (no offset will be added).IllegalArgumentException
 If anchor
is not valid.org.geotools.referencing.GeneralEnvelope#GeneralEnvelope(GridEnvelope, PixelInCell,
org.opengis.referencing.operation.MathTransform,
org.opengis.referencing.crs.CoordinateReferenceSystem)
public GeneralGridEnvelope(Envelope envelope, PixelInCell anchor, boolean isHighIncluded) throws IllegalArgumentException
Note about rounding mode
It would have been possible to round the minimal value
toward floor and the maximal value
toward ceil in order to make sure that the grid envelope encompass
fully the envelope  like what Java2D does when converting Rectangle2D
to Rectangle
). But this approach may increase by 1 or 2 units the image width or height. For example the
range [0.25 ... 99.75]
(which is exactly 101 units wide) would be casted to [1 ... 100]
, which is 102 units wide. This leads to unexpected results when using grid
envelope with image operations like "Affine
". For avoiding such changes in size, it is necessary to use the same rounding mode
for both minimal and maximal values. The selected rounding mode is nearest integer in this implementation.
Anchor
According OpenGIS specification, grid
geometry maps pixel's center. But envelopes typically encompass all pixels. This means that
grid coordinates (0,0) has an envelope starting at (0.5, 0.5). In order to revert back such
envelope to a grid envelope, it is necessary to add 0.5 to every coordinates (including the
maximum value since it is exclusive in a grid envelope). This offset is applied only if
anchor
is PixelInCell.CELL_CENTER
. Users who don't want such offset should
specify PixelInCell.CELL_CORNER
.
The convention is specified as a PixelInCell
code instead than the more detailed
PixelOrientation
because the latter is restricted to the
twodimensional case while the former can be used for any number of dimensions.
envelope
 The envelope to use for initializing this grid envelope.anchor
 Whatever envelope coordinates map to pixel center or pixel corner. Should be
PixelInCell.CELL_CENTER
for OGC convention (an offset of 0.5 will be added to
every envelope coordinate values), or PixelInCell.CELL_CORNER
for Java2D/JAI
convention (no offset will be added).isHighIncluded
 true
if the envelope maximal values are inclusive, or false
if they are exclusive. This argument does not apply to minimal values, which are
always inclusive.IllegalArgumentException
 If anchor
is not valid.org.geotools.referencing.GeneralEnvelope#GeneralEnvelope(GridEnvelope, PixelInCell,
org.opengis.referencing.operation.MathTransform,
org.opengis.referencing.crs.CoordinateReferenceSystem)
public GeneralGridEnvelope(int[] low, int[] high, boolean isHighIncluded)
low
 The valid minimum inclusive grid coordinate. The array contains a minimum value
(inclusive) for each dimension of the grid coverage. The lowest valid grid coordinate is
often zero, but this is not mandatory.high
 The valid maximum grid coordinate. The array contains a maximum value for each
dimension of the grid coverage.isHighIncluded
 true
if the high
values are inclusive (as in ISO 19123
specification), or false
if they are exclusive (as in Java usage). This argument
does not apply to low values, which are always inclusive.getLow()
,
getHigh()
public GeneralGridEnvelope(int[] low, int[] high)
Notice that this constructor has been added for compatibility with JAVA2D, which means that the high coords are intepreted as EXCLUSIVE
low
 The valid minimum inclusive grid coordinate. The array contains a minimum value
(inclusive) for each dimension of the grid coverage. The lowest valid grid coordinate is
often zero, but this is not mandatory.high
 The valid maximum grid coordinate. The array contains a maximum value for each
dimension of the grid coverage.getLow()
,
getHigh()
public int getDimension()
getDimension
in interface GridEnvelope
public GridCoordinates getLow()
getLow
in interface GridEnvelope
public GridCoordinates getHigh()
getHigh
in interface GridEnvelope
public int getLow(int dimension)
getLow
in interface GridEnvelope
dimension
 The dimension for which to obtain the coordinate value.getLow()
public int getHigh(int dimension)
getHigh
in interface GridEnvelope
dimension
 The dimension for which to obtain the coordinate value.getHigh()
public int getSpan(int dimension)
getHigh(dimension)  getLow(dimension)
.getSpan
in interface GridEnvelope
dimension
 The dimension for which to obtain the coordinate value.Rectangle.width
,
Rectangle.height
public GeneralGridEnvelope getSubGridEnvelope(int lower, int upper) throws IndexOutOfBoundsException
lower
and extending to dimension upper1
inclusive. Thus the dimension of the sub grid
envelope is upper  lower
.lower
 The first dimension to copy, inclusive.upper
 The last dimension to copy, exclusive.IndexOutOfBoundsException
 if an index is out of bounds.public Rectangle toRectangle() throws IllegalStateException
Rectangle
with the same bounds as this GeneralGridEnvelope
. This is
a convenience method for interoperability with Java2D.IllegalStateException
 if this grid envelope is not twodimensional.public int hashCode()
public boolean equals(Object object)
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