class HttpPyramid in Tinman.Terrain.Pyramids

Abstract base class for IPixelPyramid s that fetch tiles from a HTTP web server.

abstract class	HttpPyramid	extends	PixelPyramid
		base of	BingMapsPyramid
			GoogleMapsPyramid
			OpenStreetMapPyramid
			UrlPatternPyramid

Public / Attributes

CanUpdate

Does this map allow updates to its content (i.e. sample data and/or metadata)?

public override property	CanUpdate { get }
type	bool
value		true if the map content can be updated, false if not.
inherited	PixelPyramid.CanUpdate

Flags

Additional behaviour flags of the pyramid.

public override sealed property	Flags { get }
type	PyramidFlags
value		The pyramid flags.
overrides	Pyramid.Flags

FullSize

The size of the bottom-most pyramid level.

public property	FullSize { get }
type	int32
value	[pow2]	The pyramid size (width and height), in samples.
inherited	Pyramid.FullSize

Georef

Returns georeferencing information.

public override property	Georef { get }
type	Raster
value		The georeferencing object or null if no georeferencing is available.
overrides	Pyramid.Georef

Http

The ISimpleHttp object that is used to make HTTP requests.

public property	Http { get }
type	ISimpleHttp
value	[not-null]	The ISimpleHttp object.

Remarks:

The default value is a SimpleHttp instance.

Levels

The number of pyramid levels.

public property	Levels { get }
type	int32
value	[>=1]	The number of pyramid levels.
inherited	Pyramid.Levels

LifecycleState

Returns the lifecycle state of this object.

public virtual property	LifecycleState { get }
type	LifecycleState
value		The lifecycle state.
inherited	Disposable.LifecycleState

Map

Returns a MapInfo value that describes the used map raster.

public property	Map { get }
type	MapInfo
value		The map info value.
inherited	Pyramid.Map

OnUpdated

Event for listening to updates made to this pixel pyramid.

public property	OnUpdated { get }
type	IEventGeneric<PyramidEventArgs>
value	[not-null]	The event object.
inherited	Pyramid.OnUpdated

Remarks:

This event will be fired by the thread that performs the map update.

Solid

Is this pixel pyramid solid?

public property	Solid { get set }
type	bool
value		true if the pyramid is solid, false if not.

Remarks:

The HasTileData method of a solid pyramid will always return true, and HEAD requests will not be performed (see Head).

The default value is false.

TilePad

The pad width of this cube pyramid.

public property	TilePad { get }
type	int32
value	[>=0]	The pad width.
inherited	Pyramid.TilePad

Remarks:

Tile padding is used to avoid color bleeding that will occur when texture samples are filtered at the edge of a pyramid tile (assuming tiles are stored in some kind of texture atlas). The tile pad width gives the number of safety pixels at the that are borrowed from neighbouring pyramid tiles:

      8x8 tile, with a pad of 2:

    0   1   2   3   4   5   6   7
  +---+---+---+---+---+---+---+---+
0 |###|###|###|###|###|###|###|###|
  +---+---+---+---+---+---+---+---+
1 |###|###|###|###|###|###|###|###|
  +---+--(X)--+---+---+--(X)--+---+
2 |###|###|   |   |   |   |###|###|
  +---+---+---+---+---+---+---+---+
3 |###|###|   |   |   |   |###|###|
  +---+---+---+---+---+---+---+---+
4 |###|###|   |   |   |   |###|###|
  +---+---+---+---+---+---+---+---+
5 |###|###|   |   |   |   |###|###|
  +---+--(X)--+---+---+--(X)--+---+
6 |###|###|###|###|###|###|###|###|
  +---+---+---+---+---+---+---+---+
7 |###|###|###|###|###|###|###|###|
  +---+---+---+---+---+---+---+---+

The point coordinates marked with (X) will be mapped to the corner vertices of each terrain mesh sector. Only the effective region of a padded tile (i.e. the square surrounded by (X)) contains actual data. The padded pixels are sampled from neighbouring source tiles and carry redundant information.

TileSize

The size of a single map tile, in pixels.

public property	TileSize { get }
type	int32
value	[pow2]	The tile size.
inherited	Pyramid.TileSize

Public / Methods

AcquireTry

Acquires a strong reference to this disposable object.

[OwnerReturn, ThreadSafe]
public method	AcquireTry ()
type	IDisposable
returns			this if a new strong reference has been acquired, null if this object is already being disposed.
inherited	Disposable.AcquireTry

Remarks:

The object will not be actually disposed by calls to Dispose when there is at least one strong reference left. Code that calls the AcquireTry method is responsible for calling the Dispose method accordingly.

This method is not intended to be used in performance-critical code. It should only be used to high-level resource management.

Cache

Wraps this pixel pyramid in a memory cache.

[OwnerReturn, OwnerThis]
public virtual method	Cache ()
type	IPixelPyramid
returns		[not-null]	The cached map pyramid.
inherited	PixelPyramid.Cache

Remarks:

The built-in pixel pyramid operations already make use of the Cache method where applicable, so client code usually does not need to call it.

If the Cache method has already been called on this object, the method silently returns this.

See also:

PyramidsUtil.CacheMemory

---

Wraps this pixel pyramid in a file cache.

[OwnerReturn, OwnerThis]
public virtual method	Cache (PyramidFileCache cache, int32 pyramidId)
type	IPixelPyramid
params	cache	[not-null]	The cache to use.
	pyramidId	[0..1023]	Persistent unique identifier of the pixel pyramid being cached.
returns		[not-null]	The cached map pyramid.
inherited	PixelPyramid.Cache

Dispose

Releases all resources held by this object if there are no more strong references to it, decrements the reference counter by one otherwise.

[Dispose, OwnerThis, ThreadSafe]
public method	Dispose ()
inherited	Disposable.Dispose

Remarks:

The Dispose method silently returns if the object has already been disposed.

Flush

Flushes all cached data.

public virtual method	Flush ()
inherited	Pyramid.Flush

Remarks:

Performing a flush may result in I/O work. Depending on the semantics of the implementing class, this work may need to be wrapped in special Begin / End method calls. See the documentation of the implementing classes for details.

In case this object represents a read-only resource, calling the Flush method has no effect.

GetTileData

Returns the data content of the given map tile.

[ThreadSafe]
public method	GetTileData (PyramidCoords coords, TData data, int32 dataX = 0, int32 dataY = 0)
type	TileDataResult
params	coords		The pyramid tile coords.
	data	[not-null]	The output buffer to use.
	dataX	[>=0]	X-coordinate of top-left corner of output rectangle.
	dataY	[>=0]	Y-coordinate of top-left corner of output rectangle.
returns			The result code.
inherited	Pyramid.GetTileData

---

Returns the image pixels of the given map tile.

[ThreadSafe]
public method	GetTileData (CubemapFace face, int32 level, int32 x, int32 y, TData data, int32 dataX = 0, int32 dataY = 0)
type	TileDataResult
params	face		Cubemap face of map tile. Set to NegZ for unprojected map pyramids. Defaults to NegZ.
	level	[>=0]	The pyramid level.
	x		Cubemap face X-coordinate of map tile in level.
	y		Cubemap face Y-coordinate of map tile in level.
	data	[not-null]	The output buffer to use.
	dataX	[>=0]	X-coordinate of top-left corner of output rectangle.
	dataY	[>=0]	Y-coordinate of top-left corner of output rectangle.
returns			The result code.
inherited	Pyramid.GetTileData

HasTileData

Returns if there is any data content for the given map tile.

[ThreadSafe]
public method	HasTileData (PyramidCoords coords)
type	bool
params	coords		The pyramid tile coords.
returns			true if data for the given map tile exists, false if not.
inherited	Pyramid.HasTileData

---

Returns if there is any data content for the given map tile (i.e. Ok or Empty).

[ThreadSafe]
public method	HasTileData (CubemapFace face, int32 level, int32 x, int32 y)
type	bool
params	face		Cubemap face of map tile. Set to NegZ for unprojected map pyramids. Defaults to NegZ.
	level	[>=0]	The pyramid level.
	x		Cubemap face X-coordinate of map tile in level.
	y		Cubemap face Y-coordinate of map tile in level.
returns			true if data for the given map tile exists, false if not.
inherited	Pyramid.HasTileData

ToConfig

Returns the configuration value that describes this object.

public abstract method	ToConfig ()
type	ConfigValue
returns		[not-null]	The configuration value.
inherited	Pyramid.ToConfig

Remarks:

All configurable objects need to implement this interface. For simple types, it is preferable to delegate to ToValue.

The returned value may be of type Invalid, which means that this object in its current state cannot be described with the configuration API.

Before returning the resulting configuration value, Cache must be called on it, passing this IConfigurable object as parameter.

ToFullSize

Changes the level count resp. full size of this pixel pyramid.

[OwnerReturn, OwnerThis]
public virtual method	ToFullSize (int32 fullSize)
type	IPixelPyramid
params	fullSize	[pow2]	The new full size (i.e. size of bottommost level).
returns		[not-null]	The resulting pixel pyramid.
inherited	PixelPyramid.ToFullSize

See also:

IPyramidBase.FullSize

ToTilePad

Changes the tile padding of this pixel pyramid.

[OwnerReturn, OwnerThis]
public virtual method	ToTilePad (int32 tilePad)
type	IPixelPyramid
params	tilePad	[>=0]	The new tile padding value.
returns		[not-null]	The resulting pixel pyramid.
inherited	PixelPyramid.ToTilePad

See also:

IPyramidBase.TilePad

ToTileSize

Changes the tile size of this pixel pyramid.

[OwnerReturn, OwnerThis]
public virtual method	ToTileSize (int32 tileSize)
type	IPixelPyramid
params	tileSize	[pow2]	The new tile size.
returns		[not-null]	The resulting pixel pyramid.
inherited	PixelPyramid.ToTileSize

See also:

IPyramidBase.TileSize

UpdateGeoref

Updates georeferencing data of this heightmap.

[ThreadSafe]
public override method	UpdateGeoref (Raster georef)
params	georef		The new georeferencing data or null.
inherited	PixelPyramid.UpdateGeoref

See also:

IMapEntity.CanUpdate

Protected / Attributes

fullSize

The full pyramid size.

protected readonly field	fullSize
type	int32
inherited	Pyramid.fullSize

Remarks:

This is the size of the bottom-most pyramid level, given in tile pixels.

levels

The number of pyramid levels.

protected readonly field	levels
type	int32
inherited	Pyramid.levels

onUpdated

The event object of OnUpdated.

[Owner]
protected field	onUpdated
type	EventGeneric<PyramidEventArgs>
inherited	Pyramid.onUpdated

tilePad

The pad width of this cube pyramid.

protected readonly field	tilePad
type	int32
inherited	Pyramid.tilePad

tileSize

Size of a pyramid tile, in pixels.

protected readonly field	tileSize
type	int32
inherited	Pyramid.tileSize

tileSizeShift

Logarithm of base two of tileSize.

protected readonly field	tileSizeShift
type	int32
inherited	Pyramid.tileSizeShift

Protected / Constructors

HttpPyramid

Creates a new instance of HttpPyramid.

protected constructor	HttpPyramid (int32 tileSize, int32 levels, PyramidFlags flags, Raster georef, [Owner] ISimpleHttp http = null)
params	tileSize	[pow2]	The pyramid tile size, in pixels.
	levels	[>=1]	The number of pyramid levels.
	flags		The pyramid flags.
	georef	[not-null]	The georeference of the pyramid.
	http		The custom ISimpleHttp object to use. If null, a new instance of SimpleHttp will be used. Defaults to null.

Protected / Methods

DisposeManaged

Disposes the managed resources held by a concrete subclass. This method will be called at most once per subclass.

protected override method	DisposeManaged ()
overrides	Pyramid.DisposeManaged

Remarks:

This method will only be called when a disposable object is explicitly destroyed by user code calling the Dispose method. It will not be called when the object is collected as garbage by the system.

Overriding methods must call the DisposeManaged method of their base class. The base call should be the last statement.

The DisposeManaged method is called before the DisposeUnmanaged method.

DisposeUnmanaged

Disposes the unmanaged resources held by a concrete subclass. This method will be called exactly once per subclass.

protected virtual method	DisposeUnmanaged ()
inherited	Disposable.DisposeUnmanaged

Remarks:

Overriding methods must call the DisposeUnmanaged method of their base class. The base call should be the last statement.

The DisposeUnmanaged method is called after the DisposeManaged method.

DoGetTileData

Get the data content of the given pyramid tile.

protected override method	DoGetTileData (CubemapFace face, int32 level, int32 x, int32 y, ColorBuffer data, int32 dataX, int32 dataY)
type	TileDataResult
params	face		The cubemap face.
	level		The pyramid level.
	x		The tile X-coordinate.
	y		The tile Y-coordinate.
	data		Output buffer to data content.
	dataX		X-coordinate of top-left pixel in data to fill.
	dataY		Y-coordinate of top-left pixel in data to fill.
returns			The result code.
implements	Pyramid.DoGetTileData

Remarks:

The given pyramid tile coordinates are always valid.

DoHasTileData

Checks if data content for the given pyramid tile exists.

protected override sealed method	DoHasTileData (CubemapFace face, int32 level, int32 x, int32 y)
type	bool
params	face		The cubemap face.
	level		The pyramid level.
	x		The tile X-coordinate.
	y		The tile Y-coordinate.
returns			true if data content is available, false if not.
implements	Pyramid.DoHasTileData

Remarks:

The given pyramid tile coordinates are always valid.

GetTileUrl

protected abstract method	GetTileUrl (int32 level, int32 x, int32 y)
type	string
params	level
	x
	y

IsExistingTile

After the web request has succeeded, this method is called to determine if the response has delivered a valid tile image.

protected virtual method	IsExistingTile (SimpleHttpResult result)
type	bool
params	result		The request result to inspect.
returns			true if the request has delivered a valid tile image, false if the response indicated a missing tile.

Remarks:

This default implementation just returns true.

IsMissingTile

After a web request has failed because of some reason other than 404 - Not Found, this method is called to determine if the response indicates a missing tile (no error reporting is necessary in this case).

protected virtual method	IsMissingTile (SimpleHttpResult result)
type	bool
params	result		The request result to inspect.
returns			true if the request result indicates a missing tile, false if some unexpected error has occurred.

Logging

Logger

The logger object of this class.

public static readonly field	Logger
type	ILogger