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Overlay

Namespace: ThinkGeo.UI.Android

This class is the base class of all overlays in this overlay system.

public abstract class Overlay : OverlayBase, System.IDisposable

Inheritance ObjectOverlayBaseOverlay
Implements IDisposable

Remarks:

The Overlay has the similar concept as the layer. Different types of overlays stack over each other to form a map. An overlay object is responsible for getting the configuration infomation from the user.

Usually an overlay represents an image with transparent background that is laid upon other overlay such as LayerOverlay, WmsOverlay. While the MarkerOverlay will not be rendered as an image, it is actually represents a control that holds bunch of marker images on the map.

Properties

OverlayView

Gets or sets the overlay view.

public MapLayout OverlayView { get; set; }

Property Value

MapLayout
The overlay view.

IsVisible

public bool IsVisible { get; set; }

Property Value

Boolean

Name

Gets or sets the name of this overaly.

public string Name { get; set; }

Property Value

String

DrawingExceptionMode

This property gets and sets the DrawingExceptionMode used when an exception occurs during drawing.

public DrawingExceptionMode DrawingExceptionMode { get; set; }

Property Value

DrawingExceptionMode
The drawing exception mode.

MapArguments

Gets or sets the map arguments.

public MapArguments MapArguments { get; set; }

Property Value

MapArguments
The map arguments.

Attribution

Gets or sets the attribution.

public string Attribution { get; set; }

Property Value

String
The attribution.

IsEmpty

Gets a value indicating whether this instance is empty.

public bool IsEmpty { get; }

Property Value

Boolean

Remarks:

This property enhances the performance of the overlay while drawing. If is true, we will skip drawing this overlay and continue drawing the next overlay.

DrawingQuality

Gets or sets the drawingQuality for this overlay.

public DrawingQuality DrawingQuality { get; set; }

Property Value

DrawingQuality

Opacity

Gets or sets the opacity for this overlay.

public double Opacity { get; set; }

Property Value

Double

Constructors

Overlay()

public Overlay()

Methods

InitializeCore(MapArguments)

protected void InitializeCore(MapArguments mapArgument)

Parameters

mapArgument MapArguments

Dispose(Boolean)

Releases unmanaged and - optionally - managed resources.

protected void Dispose(bool disposing)

Parameters

disposing Boolean
true to release both managed and unmanaged resources; false to release only unmanaged resources.

Events

DrawingException

Occurs before exception is drawing on map.

public event EventHandler<DrawingExceptionOverlayEventArgs> DrawingException;

DrawnException

Occurs after exception is drawn on map.

public event EventHandler<DrawnExceptionOverlayEventArgs> DrawnException;

Drawing

This event raises before the overlay is drawing.

public event EventHandler<DrawingOverlayEventArgs> Drawing;

Drawn

This event raises after the overlay is drawn.

public event EventHandler<DrawnOverlayEventArgs> Drawn;