GlsMapChartDataSource Class Reference

#include <gls_map_chart_data_source.h>

Inheritance diagram for GlsMapChartDataSource:

Public Member Functions
virtual	~GlsMapChartDataSource ()
	Destructor for abstract base class.
virtual bool	GetAvailableCoverage (GeoRect *dest)=0
virtual unsigned long	GetBestLayer (GlsMapView *view, GlsMapChart *chart) const
virtual void	GetCellList (const GeoRect &coverage, unsigned long layerID, double viewLogicalHeight, double viewGeoHeight, MapChartCellList &viewList)=0
virtual void	PostDraw (GlsMapView *view, GlsMapChart *chart)
virtual bool	AreAllCellsLoaded (GlsMapView *view, GlsMapChart *chart)

Protected Member Functions
	GlsMapChartDataSource ()
	Constructor for subclasses.

Detailed Description

/class MapDataSource

Abstract base class to encapsulate map library specific code and data.

Provides a list of MapCells for a given coverage area and layer. A MapDataSource may have just one layer or many layers of MapCells available.

Member Function Documentation

virtual bool AreAllCellsLoaded ( GlsMapView *  view, GlsMapChart *  chart  )

virtual

Returns if all of the visible cells have finished loading and will be visible on the next frame

Parameters

view	The GlsMapView used to draw the chart
chart	The GlsMapChart that is being drawn

Returns

If all cells are loaded in a view

Reimplemented in DTEDMapChartDataSource.

virtual bool GetAvailableCoverage ( GeoRect *  dest )

pure virtual

Sets a GeoRect to describe the area containing all areas covered by this MapDataSource. This area may change as different databases are loaded. Calling this method may be slow. Pointer to a GeoRect to recieve the coverage.

Returns

true on success (dest contains the coverage description) or false if there was an error (dest is undefined)

Implemented in ShapefileMapChartDataSource, DNCMapChartDataSource, CADRGMapChartDataSource, AifMapChartDataSource, GeoTIFFMapChartDataSource, and DTEDMapChartDataSource.

virtual unsigned long GetBestLayer ( GlsMapView *  view, GlsMapChart *  chart  ) const

inlinevirtual

Returns the cell layer ('zoom level') that best matches the given area

Parameters

view	The GlsMapView used to draw the chart
chart	The GlsMapChart that is being drawn

Returns

The recommended layer to use

Note

Data sources that do not support layers should always return 0.

Reimplemented in ShapefileMapChartDataSource, DNCMapChartDataSource, and CADRGMapChartDataSource.

virtual void GetCellList ( const GeoRect &  coverage, unsigned long  layerID, double  viewLogicalHeight, double  viewGeoHeight, MapChartCellList &  viewList  )

pure virtual

Get the list of the available cells in a given coverage area The caller will AddRef() any of the cells that it will be holding a reference to

Parameters

coverage	GeoRect describing the requested area
layerID	Which layer to return MapCells from
viewLogicalHeight	The height of the view in logical units
viewGeoHeight	The height of the view in geographic units
viewList	Pointer MapChartCellList to recieve the list of available cells

Implemented in ShapefileMapChartDataSource, DNCMapChartDataSource, CADRGMapChartDataSource, AifMapChartDataSource, GeoTIFFMapChartDataSource, and DTEDMapChartDataSource.

virtual void PostDraw ( GlsMapView *  view, GlsMapChart *  chart  )

inlinevirtual

Called after all the cells have been drawn to allow the data source to perform additional rendering if needed

Parameters

view	The GlsMapView used to draw the chart
chart	The GlsMapChart that is being drawn

Reimplemented in DNCMapChartDataSource.

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The documentation for this class was generated from the following file:

• gls_map_chart_data_source.h