Class RasterizingLayer

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

Constructors

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RasterizingLayer(ILayer, int, IMapRenderer?, float, RenderFormat)

Creates a RasterizingLayer which rasterizes a layer for performance

Declaration
public RasterizingLayer(ILayer sourceLayer, int delayBeforeRasterize = 1000, IMapRenderer? rasterizer = null, float pixelDensity = 1, RenderFormat renderFormat = RenderFormat.Png)
Parameters
Type Name Description
ILayer sourceLayer

The Layer to be rasterized
int delayBeforeRasterize

Delay after viewport change to start re-rasterizing
IMapRenderer rasterizer

Rasterizer to use. null will use the default
float pixelDensity
RenderFormat renderFormat

render Format png is default and skp is skia picture

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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SourceLayer

Declaration
public ILayer SourceLayer { get; }
Property Value
Type Description
ILayer
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SymbolSize

Declaration
public static double SymbolSize { get; set; }
Property Value
Type Description
double

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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GetFeatures(MRect, double)

Get all features in a given MRect for a given resolution

Declaration
public override IEnumerable<IFeature> GetFeatures(MRect box, double resolution)
Parameters
Type Name Description
MRect 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 activeFetchCount, int availableFetchSlots)
Parameters
Type Name Description
int activeFetchCount

Number of active fetches for this layer. It is relevant if the layer itself has a maximum on the number of active fetches for itself.
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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ToViewport(MSection)

Declaration
public static Viewport ToViewport(MSection section)
Parameters
Type Name Description
MSection section
Returns
Type Description
Viewport
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ViewportChanged(FetchInfo)

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

Declaration
public 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