ScreenCanvas Class

Canvas with screen coordinates. Elements of the canvas have an absolute dimension (= size in pixels) but have to be repositioned whenever the viewport changes.

Inheritance Hierarchy

SystemObject
  System.Windows.ThreadingDispatcherObject
    System.WindowsDependencyObject
      System.Windows.MediaVisual
        System.WindowsUIElement
          System.WindowsFrameworkElement
            System.Windows.ControlsPanel
              System.Windows.ControlsCanvas
                Ptv.XServer.Controls.Map.CanvasesMapCanvas
                  Ptv.XServer.Controls.Map.CanvasesScreenCanvas

Namespace: Ptv.XServer.Controls.Map.Canvases
Assembly: Ptv.XServer.Controls.Map (in Ptv.XServer.Controls.Map.dll) Version: 1.7.10.0

Syntax

C++

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public abstract class ScreenCanvas : MapCanvas

Public MustInherit Class ScreenCanvas
	Inherits MapCanvas

public ref class ScreenCanvas abstract : public MapCanvas

[<AbstractClassAttribute>]
type ScreenCanvas =  
    class
        inherit MapCanvas
    end

The ScreenCanvas type exposes the following members.

Constructors

	Name	Description
	ScreenCanvas(MapView)	Initializes a new instance of the ScreenCanvas class.
	ScreenCanvas(MapView, Boolean)	Initializes a new instance of the ScreenCanvas class. If the second parameter addToMap is set to true, the new screen canvas is added to the parent map.

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Properties

	Name	Description
	CanvasCategory	Gets or sets the CanvasCategory of the canvas. The canvas category defines the z order of the canvas in the map. (Inherited from MapCanvas.)
	MapView	Gets the parent map instance. (Inherited from MapCanvas.)

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Methods

	Name	Description
	BeforeUpdate	Callback to precede the updating of the map content. (Inherited from MapCanvas.)
	CanvasToGeo	Converts a canvas point to a geographic point. (Inherited from MapCanvas.)
	CanvasToPtvMercator	This method implements a transformation from canvas coordinates to logical coordinates. (Overrides MapCanvasCanvasToPtvMercator(Point).)
	Dispose	Disposes the map canvas. During disposal the children of the canvas are removed and the viewport changed events are disconnected. (Inherited from MapCanvas.)
	GeoToCanvas(Point)	Converts a geographic point to a canvas point. (Inherited from MapCanvas.)
	GeoToCanvas(Point, String)	Converts a geographic point to a canvas coordinate. (Inherited from MapCanvas.)
	PtvMercatorToCanvas	This method implements a transformation from logical coordinates to canvas coordinates. (Overrides MapCanvasPtvMercatorToCanvas(Point).)
	ReceiveWeakEvent	Receives events from the centralized event manager. (Inherited from MapCanvas.)
	Update	Updates the map content. The map content consists of all elements of the canvas. This method is for example triggered when the viewport changes. (Inherited from MapCanvas.)

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Extension Methods

	Name	Description
	FindRelativeT	Finds an object of type T for a framework element which is somewhere in the visual tree. (Defined by MapElementExtensions.)
	ToJson	Converts an object to a JSON string representation. (Defined by JSONWriter.)

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Reference

Ptv.XServer.Controls.Map.Canvases Namespace