Class TileLayer

Layer, which displays a map consisting of individual tiles

Inheritance
object
BaseLayer
TileLayer
RasterizingTileLayer
Implements
Inherited Members
Namespace: Mapsui.Tiling.Layers
Assembly: Mapsui.Tiling.dll
Syntax
public class TileLayer : BaseLayer, ILayer, IAnimatable, INotifyPropertyChanged, IFetchableSource, IDisposable

Constructors

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TileLayer(ITileSource, int, int, IDataFetchStrategy?, IRenderFetchStrategy?, int, int, Func<TileInfo, Task<IFeature?>>?, HttpClient?)

Create tile layer for given tile source

Declaration
public TileLayer(ITileSource tileSource, int minTiles = 200, int maxTiles = 300, IDataFetchStrategy? dataFetchStrategy = null, IRenderFetchStrategy? renderFetchStrategy = null, int minExtraTiles = -1, int maxExtraTiles = -1, Func<TileInfo, Task<IFeature?>>? fetchTileAsFeature = null, HttpClient? httpClient = null)
Parameters
Type Name Description
ITileSource tileSource

Tile source to use for this layer
int minTiles

Minimum number of tiles to cache
int maxTiles

Maximum number of tiles to cache
IDataFetchStrategy dataFetchStrategy

Strategy to get list of tiles for given extent
IRenderFetchStrategy renderFetchStrategy
int minExtraTiles

Number of minimum extra tiles for memory cache
int maxExtraTiles

Number of maximum extra tiles for memory cache
Func<TileInfo, Task<IFeature>> fetchTileAsFeature

Fetch tile as feature
HttpClient httpClient

A custom HttpClient (may include custom header parameters etc)

Properties

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Extent

Returns the envelope of all available data in the layer

Declaration
public override MRect? Extent { get; }
Property Value
Type Description
MRect
Overrides
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Resolutions

List of native resolutions

Declaration
public override IReadOnlyList<double> Resolutions { get; }
Property Value
Type Description
IReadOnlyList<double>
Overrides
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TileSource

TileSource

Declaration
public ITileSource TileSource { get; }
Property Value
Type Description
ITileSource

Methods

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ClearCache()

Clears the cache of this layer. Call this if source data has was invalidated or the layer is removed.

Declaration
public void ClearCache()
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Dispose(bool)

Declaration
protected override void Dispose(bool disposing)
Parameters
Type Name Description
bool disposing
Overrides
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GetFeatures(MRect, double)

Get all features in a given MRect for a given resolution

Declaration
public override IEnumerable<IFeature> GetFeatures(MRect extent, double resolution)
Parameters
Type Name Description
MRect extent

Bounding box
double resolution

Resolution of viewport
Returns
Type Description
IEnumerable<IFeature>
Overrides
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GetFetchJobs(int, int)

Gets the fetch requests for this layer. The requests are based on the viewport stored within the layer.

Declaration
public FetchJob[] GetFetchJobs(int activeFetches, int availableFetchSlots)
Parameters
Type Name Description
int activeFetches
int availableFetchSlots

Number of available fetch slots in the caller. It is the maximum number of fetch jobs the method should return.
Returns
Type Description
FetchJob[]
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OnFetchRequested()

Declaration
protected virtual void OnFetchRequested()
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ViewportChanged(FetchInfo)

Informs the layer that the viewport has changed and it should update its data accordingly.

Declaration
public virtual void ViewportChanged(FetchInfo fetchInfo)
Parameters
Type Name Description
FetchInfo fetchInfo

Events

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FetchRequested

Indicates to the listener that it should fetch data again. This event is raised when there was a change in source data, so only relevant for dynamic data. The fetches triggered by viewport changes do not depend on it.

Declaration
public event EventHandler<FetchRequestedEventArgs>? FetchRequested
Event Type
Type Description
EventHandler<FetchRequestedEventArgs>

Implements

Extension Methods