TileAvailability

new Cesium.TileAvailability(tilingScheme, maximumLevel)
Core/TileAvailability.js 15

Reports the availability of tiles in a TilingScheme.
Name Type Description
tilingScheme TilingScheme The tiling scheme in which to report availability.
maximumLevel Number The maximum tile level that is potentially available.

Methods

addAvailableTileRange(level, startX, startY, endX, endY)
Core/TileAvailability.js 46

Marks a rectangular range of tiles in a particular level as being available. For best performance, add your ranges in order of increasing level.
Name Type Description
level Number The level.
startX Number The X coordinate of the first available tiles at the level.
startY Number The Y coordinate of the first available tiles at the level.
endX Number The X coordinate of the last available tiles at the level.
endY Number The Y coordinate of the last available tiles at the level.

computeBestAvailableLevelOverRectangle(rectangle) → Number
Core/TileAvailability.js 132

Finds the most detailed level that is available _everywhere_ within a given rectangle. More detailed tiles may be available in parts of the rectangle, but not the whole thing. The return value of this function may be safely passed to sampleTerrain for any position within the rectangle. This function usually completes in time logarithmic to the number of rectangles added with TileAvailability#addAvailableTileRange.
Name Type Description
rectangle Rectangle The rectangle.
Returns:
The best available level for the entire rectangle.

computeChildMaskForTile(level, x, y) → Number
Core/TileAvailability.js 228

Computes a bit mask indicating which of a tile's four children exist. If a child's bit is set, a tile is available for that child. If it is cleared, the tile is not available. The bit values are as follows:
Bit PositionBit ValueChild Tile
01Southwest
12Southeast
24Northwest
38Northeast
Name Type Description
level Number The level of the parent tile.
x Number The X coordinate of the parent tile.
y Number The Y coordinate of the parent tile.
Returns:
The bit mask indicating child availability.

computeMaximumLevelAtPosition(position) → Number
Core/TileAvailability.js 99

Determines the level of the most detailed tile covering the position. This function usually completes in time logarithmic to the number of rectangles added with TileAvailability#addAvailableTileRange.
Name Type Description
position Cartographic The position for which to determine the maximum available level. The height component is ignored.
Returns:
The level of the most detailed tile covering the position.
Throws:
  • DeveloperError : If position is outside any tile according to the tiling scheme.

isTileAvailable(level, x, y) → Boolean
Core/TileAvailability.js 195

Determines if a particular tile is available.
Name Type Description
level Number The tile level to check.
x Number The X coordinate of the tile to check.
y Number The Y coordinate of the tile to check.
Returns:
True if the tile is available; otherwise, false.
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