KBE3D / KBCore / Cesium / TileAvailability

类: TileAvailability

Reports the availability of tiles in a TilingScheme.

参数

The tiling scheme in which to report availability.

参数

The maximum tile level that is potentially available.

方法

addAvailableTileRange()

addAvailableTileRange(level: number, startX: number, startY: number, endX: number, endY: number): void

Marks a rectangular range of tiles in a particular level as being available. For best performance, add your ranges in order of increasing level.

参数

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.

返回

void

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computeMaximumLevelAtPosition()

computeMaximumLevelAtPosition(position: Cartographic): number

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.

参数

position

Cartographic

The position for which to determine the maximum available level. The height component is ignored.

返回

number

The level of the most detailed tile covering the position.

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computeBestAvailableLevelOverRectangle()

computeBestAvailableLevelOverRectangle(rectangle: Rectangle): number

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.

参数

rectangle

Rectangle

The rectangle.

返回

number

The best available level for the entire rectangle.

---

isTileAvailable()

isTileAvailable(level: number, x: number, y: number): boolean

Determines if a particular tile is available.

参数

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.

返回

boolean

True if the tile is available; otherwise, false.

---

computeChildMaskForTile()

computeChildMaskForTile(level: number, x: number, y: number): number

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: <table> <tr><th>Bit Position</th><th>Bit Value</th><th>Child Tile</th></tr> <tr><td>0</td><td>1</td><td>Southwest</td></tr> <tr><td>1</td><td>2</td><td>Southeast</td></tr> <tr><td>2</td><td>4</td><td>Northwest</td></tr> <tr><td>3</td><td>8</td><td>Northeast</td></tr> </table>

参数

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.

返回

number

The bit mask indicating child availability.

构造函数

构造函数

new TileAvailability(tilingScheme: TilingScheme, maximumLevel: number): TileAvailability

参数

tilingScheme

TilingScheme

maximumLevel

number

返回

TileAvailability