An
ImageryProvider that draws a wireframe grid on every tile with controllable background and glow.
May be useful for custom rendering effects or debugging terrain.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
options |
GridImageryProvider.ConstructorOptions | Object describing initialization options |
成员(属性)
readonly credit : Credit
Gets the credit to display when this imagery provider is active. Typically this is used to credit
the source of the imagery.
readonly errorEvent : Event
Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
to the event, you will be notified of the error and can potentially recover from it. Event listeners
are passed an instance of
TileProviderError.
Gets a value indicating whether or not the images provided by this imagery provider
include an alpha channel. If this property is false, an alpha channel, if present, will
be ignored. If this property is true, any images without an alpha channel will be treated
as if their alpha is 1.0 everywhere. When this property is false, memory usage
and texture upload time are reduced.
Gets the maximum level-of-detail that can be requested.
Gets the minimum level-of-detail that can be requested.
readonly proxy : Proxy
Gets the proxy used by this provider.
readonly rectangle : Rectangle
Gets the rectangle, in radians, of the imagery provided by this instance.
readonly tileDiscardPolicy : TileDiscardPolicy
Gets the tile discard policy. If not undefined, the discard policy is responsible
for filtering out "missing" tiles via its shouldDiscardImage function. If this function
returns undefined, no tiles are filtered.
Gets the height of each tile, in pixels.
Gets the width of each tile, in pixels.
readonly tilingScheme : TilingScheme
Gets the tiling scheme used by this provider.
方法
Render a grid into a canvas with background and glow
Draws a grid of lines into a canvas.
getTileCredits(x, y, level) → Array.<Credit>
Gets the credits to be displayed when a given tile is displayed.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level; |
返回值:
The credits to be displayed when the tile is displayed.
Picking features is not currently supported by this imagery provider, so this function simply returns
undefined.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level. |
longitude |
number | The longitude at which to pick features. |
latitude |
number | The latitude at which to pick features. |
返回值:
Undefined since picking is not supported.
Requests the image for a given tile.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level. |
request |
Request | 可选 The request object. Intended for internal use only. |
返回值:
The resolved image as a Canvas DOM object.
定义的类型
Initialization options for the GridImageryProvider constructor
属性:
| 属性名称 | 类型 | 可选 | 默认值 | 描述信息 |
|---|---|---|---|---|
tilingScheme |
TilingScheme |
<可选> |
new GeographicTilingScheme() | The tiling scheme for which to draw tiles. |
ellipsoid |
Ellipsoid |
<可选> |
Ellipsoid.default | The ellipsoid. If the tilingScheme is specified, this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither parameter is specified, the default ellipsoid is used. |
cells |
number |
<可选> |
8 | The number of grids cells. |
color |
Color |
<可选> |
Color(1.0, 1.0, 1.0, 0.4) | The color to draw grid lines. |
glowColor |
Color |
<可选> |
Color(0.0, 1.0, 0.0, 0.05) | The color to draw glow for grid lines. |
glowWidth |
number |
<可选> |
6 | The width of lines used for rendering the line glow effect. |
backgroundColor |
Color |
<可选> |
Color(0.0, 0.5, 0.0, 0.2) | Background fill color. |
tileWidth |
number |
<可选> |
256 | The width of the tile for level-of-detail selection purposes. |
tileHeight |
number |
<可选> |
256 | The height of the tile for level-of-detail selection purposes. |
canvasSize |
number |
<可选> |
256 | The size of the canvas used for rendering. |