GeographicTilingScheme
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new Cesium.GeographicTilingScheme(options)
engine/Source/Core/GeographicTilingScheme.js 27

A tiling scheme for geometry referenced to a simple GeographicProjection where longitude and latitude are directly mapped to X and Y. This projection is commonly known as geographic, equirectangular, equidistant cylindrical, or plate carrée.
参数名称 类型 描述信息
options object 可选 Object with the following properties:
参数名称 类型 默认值 描述信息
ellipsoid Ellipsoid Ellipsoid.WGS84 可选 The ellipsoid whose surface is being tiled. Defaults to the WGS84 ellipsoid.
rectangle Rectangle Rectangle.MAX_VALUE 可选 The rectangle, in radians, covered by the tiling scheme.
numberOfLevelZeroTilesX number 2 可选 The number of tiles in the X direction at level zero of the tile tree.
numberOfLevelZeroTilesY number 1 可选 The number of tiles in the Y direction at level zero of the tile tree.

成员(属性)

ellipsoid : Ellipsoid
engine/Source/Core/GeographicTilingScheme.js 49

Gets the ellipsoid that is tiled by this tiling scheme.

projection : MapProjection
engine/Source/Core/GeographicTilingScheme.js 71

Gets the map projection used by this tiling scheme.

rectangle : Rectangle
engine/Source/Core/GeographicTilingScheme.js 60

Gets the rectangle, in radians, covered by this tiling scheme.

方法

getNumberOfXTilesAtLevel(level) → number
engine/Source/Core/GeographicTilingScheme.js 84

Gets the total number of tiles in the X direction at a specified level-of-detail.
参数名称 类型 描述信息
level number The level-of-detail.
返回值:
The number of tiles in the X direction at the given level.

getNumberOfYTilesAtLevel(level) → number
engine/Source/Core/GeographicTilingScheme.js 94

Gets the total number of tiles in the Y direction at a specified level-of-detail.
参数名称 类型 描述信息
level number The level-of-detail.
返回值:
The number of tiles in the Y direction at the given level.

positionToTileXY(position, level, result) → Cartesian2
engine/Source/Core/GeographicTilingScheme.js 210

Calculates the tile x, y coordinates of the tile containing a given cartographic position.
参数名称 类型 描述信息
position Cartographic The position.
level number The tile level-of-detail. Zero is the least detailed.
result Cartesian2 可选 The instance to which to copy the result, or undefined if a new instance should be created.
返回值:
The specified 'result', or a new object containing the tile x, y coordinates if 'result' is undefined.

rectangleToNativeRectangle(rectangle, result) → Rectangle
engine/Source/Core/GeographicTilingScheme.js 108

Transforms a rectangle specified in geodetic radians to the native coordinate system of this tiling scheme.
参数名称 类型 描述信息
rectangle Rectangle The rectangle to transform.
result Rectangle 可选 The instance to which to copy the result, or undefined if a new instance should be created.
返回值:
The specified 'result', or a new object containing the native rectangle if 'result' is undefined.

tileXYToNativeRectangle(x, y, level, result) → Rectangle
engine/Source/Core/GeographicTilingScheme.js 144

Converts tile x, y coordinates and level to a rectangle expressed in the native coordinates of the tiling scheme.
参数名称 类型 描述信息
x number The integer x coordinate of the tile.
y number The integer y coordinate of the tile.
level number The tile level-of-detail. Zero is the least detailed.
result object 可选 The instance to which to copy the result, or undefined if a new instance should be created.
返回值:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.

tileXYToRectangle(x, y, level, result) → Rectangle
engine/Source/Core/GeographicTilingScheme.js 169

Converts tile x, y coordinates and level to a cartographic rectangle in radians.
参数名称 类型 描述信息
x number The integer x coordinate of the tile.
y number The integer y coordinate of the tile.
level number The tile level-of-detail. Zero is the least detailed.
result object 可选 The instance to which to copy the result, or undefined if a new instance should be created.
返回值:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.
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