ShapefileMapChartDataSource Class Reference

Map chart data source for loading Shapefiles. More...

#include <gls_map_shapefile.h>

Inheritance diagram for ShapefileMapChartDataSource:

Classes
class	RenderingAttorney
struct	ShapePoint
	Cartesian coordinate used by the points that define the paths loaded from shapefiles. More...

Public Types
typedef void(*	RenderPointFeatureCB) (void *const userData, const char *featureSet, const char *featureType, double longitude, double latitude, const glsColor &color, const GeoRect &region, const double logicalHeight)
typedef void(*	RenderLineFeatureCB) (void *const userData, const char *featureSet, const char *featureType, const DynamicArray< ShapePoint > &points, const GeoRect &region, const double logicalHeight)

Public Member Functions
	ShapefileMapChartDataSource ()
	Constructor.
	~ShapefileMapChartDataSource ()
	Destructor - stops rendering and releases all libraries.
bool	LoadLibraryAs (const char *shapefileRootPath, LibraryID libraryID)
bool	UnloadLibrary (LibraryID libraryID)
DynamicArray< LibraryID >	GetLoadedLibraries () const
bool	EnableLibraryRendering (LibraryID libraryID, bool enable=true)
bool	IsLibraryRenderingEnabled (LibraryID libraryID, bool &isEnabled) const
DynamicArray< const char * >	GetOrderedFeatureSetNames (LibraryID libraryID) const
bool	SetOrderedFeatureSetNames (LibraryID libraryID, const DynamicArray< const char * > &orderedFeatureSetNames)
DynamicArray< const char * >	GetFeatureTypes (LibraryID libraryID, const char *featureSet) const
bool	GetFeatureSetVisibility (LibraryID libraryID, const char *featureSet, const char *featureType, bool &isVisible) const
bool	SetFeatureSetVisibility (LibraryID libraryID, const char *featureSet, const char *featureType, bool isVisible)
bool	GetFeatureSetPointStyle (LibraryID libraryID, const char *featureSet, const char *featureType, glsColor &color, RenderPointFeatureCB &renderCB, void *&userData, bool &useMapScale) const
bool	SetFeatureSetPointStyle (LibraryID libraryID, const char *featureSet, const char *featureType, const glsColor &color, const RenderPointFeatureCB renderCB=NULL, void *const userData=NULL, const bool useMapScale=NULL)
bool	GetFeatureSetLineStyle (LibraryID libraryID, const char *featureSet, const char *featureType, glsColor &color, float &width, uint16_t &stipplePattern, int &stippleMultiplier) const
bool	GetFeatureSetLineStyle (const LibraryID libraryID, const char *const featureSet, const char *const featureType, RenderLineFeatureCB &renderCB, void *&userData) const
bool	SetFeatureSetLineStyle (LibraryID libraryID, const char *featureSet, const char *featureType, glsColor color, float width=DEF_LINE_WIDTH, uint16_t stipplePattern=DEF_LINE_STIPPLE_PATTERN, int stippleMultiplier=0)
bool	SetFeatureSetLineStyle (LibraryID libraryID, const char *featureSet, const char *featureType, const RenderLineFeatureCB renderCB, void *const userData=NULL)
bool	GetFeatureSetFillStyle (LibraryID libraryID, const char *featureSet, const char *featureType, glsColor &color, bool &drawBoundary, glsColor &boundaryColor, float &boundaryWidth, uint16_t &boundaryStipplePattern, int &boundaryStippleMultiplier) const
bool	SetFeatureSetFillStyle (LibraryID libraryID, const char *featureSet, const char *featureType, const glsColor &color, bool drawBoundary=false, const glsColor &boundaryColor=glsColor(0, 0, 0, 255), float boundaryWidth=DEF_LINE_WIDTH, uint16_t boundaryStipplePattern=DEF_LINE_STIPPLE_PATTERN, int boundaryStippleMultiplier=0)
bool	GetFeatureSetTextStyle (LibraryID libraryID, const char *featureSet, const char *featureType, GlsFontBase *&glsFont, glsColor &textColor, double &scale, double &xOffset, double &yOffset, bool &isVisible) const
bool	SetFeatureSetTextStyle (LibraryID libraryID, const char *featureSet, const char *featureType, GlsFontBase *glsFont, const glsColor &textColor=glsColor(0, 0, 0, 255), double scale=1.0, double xOffset=0.0f, double yOffset=0.0f, bool isVisible=true)
bool	SetCacheDimensions (LibraryID libraryID, double degreesLongitude, double degreesLatitude)
bool	GetAvailableCoverage (GeoRect *dest) DISTI_METHOD_OVERRIDE
	See base class.
LayerID	GetBestLayer (GlsMapView *view, GlsMapChart *chart) const DISTI_METHOD_OVERRIDE
void	GetCellList (const GeoRect &coverage, LayerID layerID, double viewLogicalHeight, double viewGeoHeight, MapChartCellList &viewList) DISTI_METHOD_OVERRIDE
	See base class.
Public Member Functions inherited from GlsMapChartDataSource
virtual	~GlsMapChartDataSource ()
	Destructor for abstract base class.
virtual void	PostDraw (GlsMapView *view, GlsMapChart *chart)
virtual bool	AreAllCellsLoaded (GlsMapView *view, GlsMapChart *chart)

Additional Inherited Members
Protected Member Functions inherited from GlsMapChartDataSource
	GlsMapChartDataSource ()
	Constructor for subclasses.

Detailed Description

Map chart data source for loading Shapefiles.

Note

The ESRI Shapefile specification does not deal with shapefiles at different scales or levels of detail (e.g., 1:100k, 1:250k, 1:1M, etc.). This program, paralleling the DNC map data source, calls these different shapefiles "libraries". Multiple libraries can be loaded simultaneously and then unloaded when desired, all in the same data source.

The ESRI Shapefile specification calls sets of features "layers", but the MapToolkit already used that term to refer to the different bin sizes it renders the Shapefile's vector data at. Due to existing virtual function names with "layer" in them, we retain MapToolkit's use of the term and substitute "feature set" (or use "Shapefile layer" when necessary) for Shapfile's notion of a "layer".

A feature set often (but not always) comes from a single .shp file with a single Shapefile layer and contains different subtypes of features (e.g., natural.shp may have feature types "forest", "river", etc.).

Note

Each library has a set of attributes (visibility, color, etc.) for each of its feature sets, and each feature set has optional attributes to override the defaults for a specific feature type within set. These default and overridden attributes can be controlled with the setter and getter member functions.

For instance, the "natural" feature set could have black as the line color for all its features but override it to blue for rivers and green for forests.

Member Typedef Documentation

typedef void( * RenderLineFeatureCB) (void *const userData, const char *featureSet, const char *featureType, const DynamicArray< ShapePoint > &points, const GeoRect &region, const double logicalHeight)

Draw callback for a user supplied line feature render routine. This routine is called with the model matrix loaded appropriately as to draw at the correct location.

Parameters

userData	user supplied data for callback (supplied with SetPointFeatureRenderCB())
featureSet	The name of the feature set (often corresponds to a single .shp file).
featureType	The name of a type of feature within the feature set (e.g., in a "natural" feature set, there might be "water" and "forest" among others).
points	the vertices of the path.
region	region of the chart that is rendering
logicalHeight	height in logical units corresponding to height of render region

typedef void( * RenderPointFeatureCB) (void *const userData, const char *featureSet, const char *featureType, double longitude, double latitude, const glsColor &color, const GeoRect &region, const double logicalHeight)

Draw callback for a user supplied point feature render routine. This routine is called with the model matrix loaded appropriately as to draw at the correct location using the origin (i.e., a vertex draw to (0,0) will map to the correct location as described by pointCoord. This routine does not need to save the model stack as the caller will push and pop (save) it accordingly.

Parameters

userData	user supplied data for callback (supplied with SetPointFeatureRenderCB())
featureSet	The name of the feature set (often corresponds to a single .shp file).
featureType	The name of a type of feature within the feature set (e.g., in a "natural" feature set, there might be "water" and "forest" among others).
longitude	longitude of point feature
latitude	longitude of point feature
color	color assigned to point feature
region	region of the chart that is rendering
logicalHeight	height in logical units corresponding to height of render region

Member Function Documentation

bool EnableLibraryRendering	(	LibraryID	libraryID,
		bool	enable = true
	)

Enable a given library to render. By default, only one library is set to render at a time. This function allows the user to render multiple libraries at a time, which may be useful if the libraries have orthogonal features in them, e.g., one library for roads, one for buildings, etc. (More commonly, a library has multiple feature sets within it, and each library covers the same geographic area but represents a different scale or level of detail.) Libraries are rendered in the order of their LibraryIDs, starting with the smallest value on the "bottom" of the texture and the next smallest writing on top of it (possibly overwriting).

Parameters

libraryID	The library to update. If not found, this function emits a warning to the console and returns false without changing rendering.
enable	Whether the library should be enabled (defaults to true).

Returns

true if the library was found.

See also

IsLibraryRenderingEnabled()

LoadLibraryAs()

LayerID GetBestLayer ( GlsMapView *  view, GlsMapChart *  chart  ) const

virtual

See base class

Note

: "Layer" here refers to internal resolution level, not Shapefile layer.

Reimplemented from GlsMapChartDataSource.

bool GetFeatureSetFillStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		glsColor &	color,
		bool &	drawBoundary,
		glsColor &	boundaryColor,
		float &	boundaryWidth,
		uint16_t &	boundaryStipplePattern,
		int &	boundaryStippleMultiplier
	)		const

Retrieves the current fill style of the features in feature set.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in the "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default visibility for the feature set. If not found, it emits a warning to the console and returns false.
[out]	color	The fill color for the requested features.
[out]	drawBoundary	Whether or not to draw the area boundary
[out]	boundaryColor	The boundary color for the requested features.
[out]	boundaryWidth	The line width
[out]	boundaryStipplePattern	The stipple pattern for lines (see documentation of glLineStipple())
[out]	boundaryStippleMultiplier	The multiplier for stippling (see documentation of glLineStipple())

Returns

true if the feature set and type (if not null/empty) were found. If false, the output parameter is unchanged.

bool GetFeatureSetLineStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		glsColor &	color,
		float &	width,
		uint16_t &	stipplePattern,
		int &	stippleMultiplier
	)		const

Retrieves the current line style of the features in feature set.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in the "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default line style for the feature set. If not found, it emits a warning to the console and returns false.
[out]	color	The line color for the requested features.
[out]	width	The line width for the requested features.
[out]	stipplePattern	The line stipple pattern for the requested features.
[out]	stippleMultiplier	The line stipple multiplier for the requested features.

Returns

true if the feature set and type were found and they were set with the corresponding overload of SetFeatureSetLineStyle(); false otherwise. (If returning false, the output parameters are unchanged.)

bool GetFeatureSetLineStyle	(	const LibraryID	libraryID,
		const char *const	featureSet,
		const char *const	featureType,
		RenderLineFeatureCB &	renderCB,
		void *&	userData
	)		const

Retrieves the current line callback for the feature set.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in the "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default line style for the feature set. If not found, it emits a warning to the console and returns false.
[out]	renderCB	The line callback
[out]	userData	The user data passed to the callback

Returns

true if the feature set and type were found and they were set with the corresponding overload of SetFeatureSetLineStyle(); false otherwise. (If returning false, the output parameters are unchanged.)

bool GetFeatureSetPointStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		glsColor &	color,
		RenderPointFeatureCB &	renderCB,
		void *&	userData,
		bool &	useMapScale
	)		const

Retrieves the current point style of the features in feature set.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in the "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default point style for the feature set. If not found, it emits a warning to the console and returns false.
[out]	color	The point color for the requested features.
[out]	renderCB	render callback else NULL for no callback
[out]	userData	user supplied data to be handed to callback
[out]	useMapScale	true if point feature should scale with the map (will become larger as the view zooms in), false is point feature should scale to attempt maintain the same size in logical space regardless of the map zoom

Returns

true if the feature set and type (if not null/empty) were found. If false, the output parameters are unchanged.

bool GetFeatureSetTextStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		GlsFontBase *&	glsFont,
		glsColor &	textColor,
		double &	scale,
		double &	xOffset,
		double &	yOffset,
		bool &	isVisible
	)		const

Retrieves the current text style of the features in feature set.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in the "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default visibility for the feature set. If not found, it emits a warning to the console and returns false.
[out]	glsFont	The instance of a font in this GL Studio project
[out]	textColor	The text color for the requested features.
[out]	isVisible	Whether the text is visible for the requested features.
[out]	scale	The scale of the text (default = 1.0)
[out]	xOffset	horizontal offset from the default text location (text starts at the center of its objects extents)
[out]	yOffset	vertical offset from the default text location (text starts at the center of its objects extents)

Note

This function does not take ownership of the strings passed in.

Returns

true if the feature set and type (if not null/empty) were found. If false, the output parameters are unchanged.

bool GetFeatureSetVisibility	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		bool &	isVisible
	)		const

Retrieves the current visibility of the features in the given feature set, optionally limited to a single feature type.

Parameters

	libraryID	The library to query.
	featureSet	The name of the feature set (often corresponds to a single .shp file). If null, empty, or not found, it emits a warning to the console and returns false.
	featureType	The name of a type of feature within the feature set (e.g., in a "natural" feature set, there might be "water" and "forest" among others). If null or empty, it returns the default visibility for the feature set. If not found, it emits a warning to the console and returns false.
[out]	isVisible	Whether the requested features are visible.

Returns

true if the feature set and type (if not null/empty) were found. If false, the output parameter is unchanged.

DynamicArray<const char*> GetFeatureTypes	(	LibraryID	libraryID,
		const char *	featureSet
	)		const

Returns a list of feature types in the given featureSetName within the given library.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null or not found, this function emits an error to the console and returns an empty array.

Note

The caller is NOT responsible to delete/free the pointers in the returned array. They are guaranteed valid until LoadLibraryAs() or UnloadLibrary() is called for this library.

DynamicArray<LibraryID> GetLoadedLibraries

(

)

const

Returns a list of all currently loaded library IDs.

See also

LoadLibraryAs()

UnloadLibrary()

DynamicArray<const char*> GetOrderedFeatureSetNames

(

LibraryID

libraryID

)

const

Returns a list of feature set names in the order they are to be drawn, from bottom to top.

Parameters

libraryID

The library to query. If not found, the function emits a warning to the console and returns an empty array.

Note

The caller is NOT responsible to delete the pointers in the array. They are guaranteed valid until LoadLibraryAs() or UnloadLibrary() is called for this libraryID.

See also

SetOrderedFeatureSetNames()

GetFeatureNames()

bool IsLibraryRenderingEnabled	(	LibraryID	libraryID,
		bool &	isEnabled
	)		const

Query whether a given library is set to render.

Parameters

	libraryID	The library to update. If not found, this function emits a warning to the console and returns false without changing the output parameter.
[out]	isEnabled	Whether the library is enabled

Returns

true if the library was found.

See also

EnableLibraryRendering()

bool LoadLibraryAs	(	const char *	shapefileRootPath,
		LibraryID	libraryID
	)

Load a Shapefile (or files) from the given path and associate it with a given library identifier.

Parameters

shapefileRootPath	path to Shapefile or directory containing Shapefile(s). Multiple files in one folder will be considered one library. If null, empty, or not found, the function emits an error and returns false.
libraryID	The library ID (see note), often the scale of this library. It acts as a handle to this library for other operations on it using this data source.

If the path loads successfully but the ID has already been used, it will unload the old data and replace it with the data from this path after emitting a warning to the console (unload first to avoid the warning).

The library ID also controls what order multiple enabled libraries are rendered in, starting with the lowest libraryID and going to the largest.

Note

This method can be called repeatedly to add multiple libraries to this data source. The loading of different libraries can take place in any order, and multiple libraries can be loaded into the same data source object. Only the first library loaded is enabled for rendering; EnableLibraryRendering() controls which library or libraries render. The libraryID controls the order of rendering when multiple libraries are enabled.

See also

UnloadLibrary()

GetLoadedLibraries()

EnableLibraryRendering()

Note

We would name this LoadLibrary(), but Windows #defines LoadLibrary, which interferes.

Returns

Returns whether the path was loaded successfully.

bool SetCacheDimensions	(	LibraryID	libraryID,
		double	degreesLongitude,
		double	degreesLatitude
	)

Sets the geographical size of the region to cache. Each library has its own cache region.

Parameters

libraryID	The library whose cache size to adjust.
degreesLongitude	the width of cache size in degrees of longitude
degreesLatitude	the height of cache size in degrees of latitude

Returns

true if the library was found.

bool SetFeatureSetFillStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		const glsColor &	color,
		bool	drawBoundary = false,
		const glsColor &	boundaryColor = glsColor(0, 0, 0, 255),
		float	boundaryWidth = DEF_LINE_WIDTH,
		uint16_t	boundaryStipplePattern = DEF_LINE_STIPPLE_PATTERN,
		int	boundaryStippleMultiplier = 0
	)

Sets the fill style for polygon features in the feature set.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null, sets the style for all features sets. If non-null and not found, this function emits a warning to the console and returns false
featureType	The name of the feature. If null or empty, it applies to the default attributes for the feature set. If not found, it creates a new feature attribute override entry.
color	The RGBA color value for filling polygons.
boundaryColor	The boundary color for the requested features.
drawBoundary	Whether or not to draw the area boundary
boundaryWidth	The line width
boundaryStipplePattern	The stipple pattern for lines (see documentation of glLineStipple())
boundaryStippleMultiplier	The multiplier for stippling (see documentation of glLineStipple())

Note

This can be called multiple times, once with featureType == NULL to set the default and then with featureType != NULL to change specific features.

Returns

true if the feature set was found.

bool SetFeatureSetLineStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		glsColor	color,
		float	width = DEF_LINE_WIDTH,
		uint16_t	stipplePattern = DEF_LINE_STIPPLE_PATTERN,
		int	stippleMultiplier = 0
	)

Sets the line style (outline for polygon features) for features in a set.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null, sets the style for all features sets. If non-null and not found, this function emits a warning to the console and returns false
featureType	The name of the feature. If null or empty, it applies to the default attributes for the feature set. If not found, it creates a new feature attribute override entry.
color	The RGBA color value for lines
width	The line width
stipplePattern	The stipple pattern for lines (see documentation of glLineStipple())
stippleMultiplier	The multiplier for stippling (see documentation of glLineStipple())

Note

There are two overloads of this function – this one that supplies OpenGL line settings and another that supplies a user callback for custom drawing. Calling this function with the same libraryID, featureSet, and featureType as a previously configured with a callback will discard the callback.

Returns

true if the feature set was found.

bool SetFeatureSetLineStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		const RenderLineFeatureCB	renderCB,
		void *const	userData = NULL
	)

Sets the line callback for features in a set.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null, sets the style for all features sets. If non-null and not found, this function emits a warning to the console and returns false
featureType	The name of the feature. If null or empty, it applies to the default attributes for the feature set. If not found, it creates a new feature attribute override entry.
renderCB	the line callback
userData	The optional user data passed to the callback, can be NULL if unused.

Note

There are two overloads of this function – this one that supplies OpenGL line settings and another that supplies a user callback for custom drawing. Calling this function with the same libraryID, featureSet, and featureType as a previously configured with OpenGL line settings will discard the OpenGL line settings.

Returns

true if the feature set was found. Will return false and have no effect if renderCB is NULL.

bool SetFeatureSetPointStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		const glsColor &	color,
		const RenderPointFeatureCB	renderCB = NULL,
		void *const	userData = NULL,
		const bool	useMapScale = NULL
	)

Sets the point style (outline for polygon features) for features in a set.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null, sets the style for all features sets. If non-null and not found, this function emits a warning to the console and returns false
featureType	The name of the feature. If null or empty, it applies to the default attributes for the feature set. If not found, it creates a new feature attribute override entry.
color	The RGBA color value for points
renderCB	render callback else NULL for no callback
userData	user supplied data to be handed to callback
useMapScale	true if point feature should scale with the map (will become larger as the view zooms in), false is point feature should scale to attempt maintain the same size in logical space regardless of the map zoom

Note

This can be called multiple times, once with featureType == NULL to set the default and then with featureType != NULL to change specific features.

Returns

true if the feature set was found.

bool SetFeatureSetTextStyle	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		GlsFontBase *	glsFont,
		const glsColor &	textColor = glsColor(0, 0, 0, 255),
		double	scale = 1.0,
		double	xOffset = 0.0f,
		double	yOffset = 0.0f,
		bool	isVisible = true
	)

Sets the text style for a feature set.

Parameters

libraryID	The library to query.
featureSet	The name of the feature set. If null, sets the style for all features sets. If non-null and not found, this function emits a warning to the console and returns false
featureType	The name of the feature. If null or empty, it applies to the default attributes for the feature set. If not found, it creates a new feature attribute override entry.
glsFont	The instance of a font in this GL Studio project
textColor	Color of the text. (Defaults to black.)
isVisible	Whether the text is visible for the requested features.
scale	The scale of the text (default = 1.0)
xOffset	horizontal offset from the default text location (text starts at the center of its objects extents)
yOffset	vertical offset from the default text location (text starts at the center of its objects extents)

Note

This can be called multiple times, once with featureType == NULL to set the default and then with featureType != NULL to change specific features.

This function does not take ownership of the strings passed in.

Returns

true if the feature set was found.

bool SetFeatureSetVisibility	(	LibraryID	libraryID,
		const char *	featureSet,
		const char *	featureType,
		bool	isVisible
	)

Sets the visibility for features in a feature set.

Parameters

libraryID	The library to update.
featureSet	The name of the feature set. If null, sets the visibility for all features sets. If non-null and not found, this function emits a warning to the console and returns false without changing visibility.
featureType	The type of feature within the feature set. If null or empty, it applies to the default feature set. If not found, it creates a new feature attribute override entry.
isVisible	The visibility to be applied.

Note

This can be called multiple times, once with featureType == NULL to set the default and then with featureType != NULL to change specific features.

Returns

true if the feature set and was found.

bool SetOrderedFeatureSetNames	(	LibraryID	libraryID,
		const DynamicArray< const char * > &	orderedFeatureSetNames
	)

Sets the feature set names in the order they are to be drawn.

Parameters

libraryID	The library to update.
orderedFeatureSetNames	The list of names in order from bottom to top. If any feature set name is null, empty, or does not exist or if a name is missing from the list, a warning is emitted to the console, and the function returns false without changing draw order.

Note

Use GetOrderedFeatureSetNames() to get a valid list of feature set names, reorder them in place, and pass the result into this function.

This function does NOT take ownership of the strings in the array, though it may already have ownership if the array is a reordering of the result of GetOrderedFeatureSetNames().

Returns

true if all names were applied.

bool UnloadLibrary

(

LibraryID

libraryID

)

Unloads a given library.

Returns

true if the library was found.

See also

LoadLibraryAs()

GetLoadedLibraries()

---

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

• gls_map_shapefile.h