C# Класс Mapsui.Providers.MemoryProvider

Datasource for storing a limited set of geometries.

The MemoryProvider doesn’t utilize performance optimizations of spatial indexing, and thus is primarily meant for rendering a limited set of Geometries.

A common use of the MemoryProvider is for highlighting a set of selected features.

The following example gets data within a BoundingBox of another datasource and adds it to the map.

 List<Geometry> geometries = myMap.Layers[0].DataSource.GetGeometriesInView(myBox); VectorLayer laySelected = new VectorLayer("Selected Features"); laySelected.DataSource = new MemoryProvider(geometries); laySelected.Style.Outline = new Pen(Color.Magenta, 3f); laySelected.Style.EnableOutline = true; myMap.Layers.Add(laySelected);

Adding points of interest to the map. This is useful for vehicle tracking etc.

 List<Mapsui.Geometries.Geometry> geometries = new List<Mapsui.Geometries.Geometry>(); //Add two points geometries.Add(new Mapsui.Geometries.Point(23.345,64.325)); geometries.Add(new Mapsui.Geometries.Point(23.879,64.194)); Mapsui.Layers.VectorLayer layerVehicles = new Mapsui.Layers.VectorLayer("Vechicles"); layerVehicles.DataSource = new Mapsui.Data.Providers.MemoryProvider(geometries); layerVehicles.Style.Symbol = Bitmap.FromFile(@"C:\data\car.gif"); myMap.Layers.Add(layerVehicles);

Наследование: IProvider

Показать файл Открыть проект Примеры использования класса

Открытые методы

Метод	Описание
Clear ( ) : void
Find ( object value ) : IFeature
Find ( object value, string primaryKey ) : IFeature
GetExtents ( ) : BoundingBox	Boundingbox of dataset
GetFeaturesInView ( BoundingBox box, double resolution ) : IEnumerable
MemoryProvider ( ) : System
MemoryProvider ( Geometry geometry ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( IEnumerable features ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( IEnumerable geometries ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( IFeature feature ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( IFeatures features ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( byte wellKnownBinaryGeometry ) : System	Initializes a new instance of the MemoryProvider
MemoryProvider ( string wellKnownTextGeometry ) : System	Initializes a new instance of the MemoryProvider

Описание методов

Clear() публичный Метод

public Clear ( ) : void
Результат	void

Find() публичный Метод

public Find ( object value ) : IFeature
value	object
Результат	IFeature

Find() публичный Метод

public Find ( object value, string primaryKey ) : IFeature
value	object
primaryKey	string
Результат	IFeature

GetExtents() публичный Метод

Boundingbox of dataset

public GetExtents ( ) : BoundingBox
Результат	BoundingBox

GetFeaturesInView() публичный Метод

public GetFeaturesInView ( BoundingBox box, double resolution ) : IEnumerable
box	BoundingBox
resolution	double
Результат	IEnumerable