flywave-mapview.visibletileset

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VisibleTileSet class

Manages visible Tiles for MapView.

Responsible for election of rendered tiles: - quad-tree traversal - frustum culling - sorting tiles by relevance (visible area) to prioritize load - limiting number of visible tiles - caching tiles - searching cache to replace visible but yet empty tiles with already loaded siblings in nearby zoom levels

Signature:

export declare class VisibleTileSet 

Constructors

Constructor	Modifiers	Description
(constructor)(m_frustumIntersection, m_tileGeometryManager, options, m_taskQueue)		Constructs a new instance of the VisibleTileSet class

Properties

Property	Modifiers	Type	Description
allVisibleTilesLoaded		boolean
dataSourceTileList		DataSourceTileList[]
maxGeometryHeight		number
maxTilesPerFrame		number	(BETA) Gets the maximum number of tiles that can be added to the scene per frame
minGeometryHeight		number
options		VisibleTileSetOptions
resourceComputationType		ResourceComputationType	The way the cache usage is computed, either based on size in MB (mega bytes) or in number of tiles.

Methods

Method	Modifiers	Description
clearTileCache(dataSource, filter)		Clear the tile cache. Remove the Tile objects created by cacheable DataSource. If a DataSource name is provided, this method restricts the eviction the DataSource with the given name.
disposePendingTiles()		Dispose tiles that are marked for removal by algorithm.
disposeTile(tile)		Dispose a Tile from cache, 'dispose()' is also called on the tile to free its resources.
forEachCachedTile(fun, dataSource)		Process callback function [[fun]] with each tile in the cache. Optional [[dataSource]] parameter limits processing to the tiles that belongs to DataSource passed in.
forEachVisibleTile(fun)		Process callback function [[fun]] with each visible tile in set.
getCachedTile(dataSource, tileKey, offset, frameNumber)		Gets the tile corresponding to the given data source, key and offset from the cache.
getDataSourceCacheSize()		Returns cache size.
getNumberOfVisibleTiles()		Retrieves maximum number of visible tiles.
getRenderedTile(dataSource, tileKey, offset)		Gets the tile corresponding to the given data source, key and offset from the rendered tiles.
getRenderedTileAtLocation(dataSource, geoPoint, offset)		Gets the tile corresponding to the given data source and location from the rendered tiles.
getTile(dataSource, tileKey, offset, frameNumber)		Gets the tile corresponding to the given data source, key and offset, creating it if necessary.
markTilesDirty(dataSource, filter)		Visit each tile in visible, rendered, and cached sets. * Visible and temporarily rendered tiles will be marked for update and retained. * Cached but not rendered/visible will be evicted.
removeDataSource(dataSource)		Removes all internal bookkeeping entries and cache related to specified datasource. Called by MapView when DataSource has been removed from MapView.
setDataSourceCacheSize(size, computationType)		Sets cache size.
setNumberOfVisibleTiles(size)		Sets maximum number of visible tiles.
updateClipPlanes(maxElevation, minElevation)		Evaluate frustum near/far clip planes and visibility ranges.
updateRenderList(storageLevel, zoomLevel, dataSources, frameNumber, elevationRangeSource)		Calculates a new set of visible tiles.