Provides access to members that control pixel block cursor.
Product Availability
Members
Description | ||
---|---|---|
GetBlockSize | Gets the cursor block size. | |
InitByRaster | Initializes the cursor by the raster interface. | |
InitByRawPixels | Initializes the cursor by the raw pixel interface. | |
NextBlock | Obtains the next pixel block from the cursor. | |
ScanMode | The cursor scan mode: Line = 0, LineSerpent = 1, Serpent2 = 3, alaGIF = 4. | |
UpdateBlockSize | Updates the cursor block size. |
CoClasses that implement IPixelBlockCursor
CoClasses and Classes | Description |
---|---|
PixelBlockCursor | A PixelBlock cursor class. |
Remarks
A legacy interface in ArcGIS 9.2
The IPixelBlockCursor interface controls
iteration through the pixel blocks of a Raster and
a RasterBand.
The InitByRawPixels method initializes a
PixelBlock from a RasterBand by
specifying the pixel block size.
The InitByRaster method initializes the
PixelBlock from a Raster. The
size of the PixelBlock is determined automatically
when creating from a Raster.
GetBlockSize returns the size of the current
pixel block.
NextBlock retrieves the next pixel block, the
location of upper-left corner of the pixel block in pixel
space, and size of the pixel block.
The ScanMode, a write-only property, specifies
the pixel block scan mode. The default is line mode. If you wish to
change the scan mode, this property must be set immediately after
initializing pixel block (calling InitByRawPixels or
InitByRaster). The supported 4 scan modes are Line,
LineSerpent, Serpent, and alaGIF, with values 0, 1, 3, and 4
respectively.
The UpdateBlockSize method changes the pixel
block size for retrieving the next pixel block. This should be used
only when reading pixel block from a
Raster.
When iterating through the pixel blocks in a
RasterBand, you must specify the size of the pixel
block at the time of initiating it. After initiation, the size of
the pixel block is fixed. When iterating through the pixel blocks
in a Raster, the size of the pixel block is
determined automatically at the time of initiation. You can modify
it later on.