Detailed Description

This class is used when the application wishes to receive a callback before a layer is drawn and after a layer has been drawn.

The expected use is with the TSLDynamicDataObjectLayer and the OpenGL Drawing Surface for managing OpenGL resources.

Public Member Functions
virtual void	preDrawLayer (TSLRenderingInterface renderingInterface, const TSLEnvelope extent)=0

virtual void	postDrawLayer (TSLRenderingInterface renderingInterface, const TSLEnvelope extent)=0

virtual void	releaseResources (int drawingSurfaceId)=0


virtual	~TSLDataLayerDrawingCallback ()=0

Constructor & Destructor Documentation

TSLDataLayerDrawingCallback::~TSLDataLayerDrawingCallback ( )

inlinepure virtual

virtual void TSLDataLayerDrawingCallback::postDrawLayer	(	TSLRenderingInterface *	renderingInterface,
		const TSLEnvelope *	extent )

pure virtual

Provides callbacks to the application at the point just after the layer has been drawn.

The developer should provide an implementation of this method.

Parameters

renderingInterface	Provides a handle to the drawing operations.
extent	Provides the extent of the area being drawn by the drawing surface in TMCs.

virtual void TSLDataLayerDrawingCallback::preDrawLayer	(	TSLRenderingInterface *	renderingInterface,
		const TSLEnvelope *	extent )

pure virtual

Provides callbacks to the application at the point just before the layer is drawn.

The developer should provide an implementation of this method.

Parameters

renderingInterface	Provides a handle to the drawing operations.
extent	Provides the extent of the area being drawn by the drawing surface in TMCs.

virtual void TSLDataLayerDrawingCallback::releaseResources ( int drawingSurfaceId )

pure virtual

This method is called when the application is expected to release any resources that it has allocated.

This method is not called when NULL is passed to TSLDataLayer::addDrawingCallback.

Parameters

drawingSurfaceId The drawing surface id that the resources are being invalidated for.