IlvProjectionInterface Class Reference

This class provides facilities to get run-time information about the parameters of a projection, and to set or modify their values. More...

#include <ilviews/maps/projection/projitf.h>

Inherits IlvValueInterface.

Public Member Functions
virtual void	getAccessors (const IlvSymbol *const **accessors, const IlvValueTypeClass *const **types, IlUInt &count) const
	Returns the list of accessors of a projection. More...
virtual const IlvValueTypeClass *	getValueType (const IlvSymbol *valueName) const
	Returns the type of the accessor parameter. More...
IlBoolean	isValueReadOnly (const IlvSymbol *valueName) const
virtual IlvValue &	queryValue (IlvValue &value) const
	Returns the value of a projection parameter in value. More...

Detailed Description

This class provides facilities to get run-time information about the parameters of a projection, and to set or modify their values.

It can be used, for example, to create projection editors in a map application.
To get the projection interface of a projection instance, use the IlvProjection::getInterface method.

See Also

IlvProjection, IlvProjectionDictionary, IlvProjectionClassInfo, IlvValue. Library: ilvmaps

Member Function Documentation

virtual void IlvProjectionInterface::getAccessors ( const IlvSymbol *const **  accessors, const IlvValueTypeClass *const **  types, IlUInt &  count  ) const

virtual

Returns the list of accessors of a projection.

Accessors is the resulting array of symbols. Each symbol is the name of a projection parameter types is the array of the types of accessors, count is the number of accessors.
The existing types for accessors that are relevant for a projection parameter are the following:

• IlvValueIntType
• IlvValueUIntType
• IlvValueStringType
• IlvValueBooleanType
• IlvValueDoubleType

Parameters

accessors	The resulting array of symbols.
types	The array of the types of accessors.
count	The number of accessors.

virtual const IlvValueTypeClass* IlvProjectionInterface::getValueType ( const IlvSymbol *  valueName ) const

virtual

Returns the type of the accessor parameter.

If parameter is not an accessor of the projection class, the function returns a null pointer.

Parameters

valueName

The name of the parameter to fetch.

Returns

The type of the accessor.

IlBoolean IlvProjectionInterface::isValueReadOnly

(

const IlvSymbol *

valueName

)

const

Returns IlTrue if the parameter valueName cannot be changed.

Parameters

valueName

The parameter to check.

Returns

IlTrue if the value is read only, IlFalse otherwise.

virtual IlvValue& IlvProjectionInterface::queryValue ( IlvValue &  value ) const

virtual

Returns the value of a projection parameter in value.

The queryValue method can be used in the following way:

   IlvValue arg("centralParallel");
   char * label = (char*)projection->queryValue(arg);

Note

See the Rogue Wave Views Foundation Package Reference Manual for complete information on the IlvValue class.

Parameters

value

The projection parameter.

Returns

The value of the parameter.