TCoordinate Class Reference

#include <lbsposition.h>

Link against: lbs.lib

class TCoordinate

Protected Attributes
TReal32	iAltitude
TPositionDatumId	iDatum
TReal64	iLatitude
TReal64	iLongitude
TUint8	iReserved

Public Member Functions
	TCoordinate()
	TCoordinate(const TReal64 &, const TReal64 &)
	TCoordinate(const TReal64 &, const TReal64 &, TReal32)
IMPORT_C TReal32	Altitude()
IMPORT_C TInt	BearingTo(const TCoordinate &, TReal32 &)
IMPORT_C TPositionDatumId	Datum()
IMPORT_C TInt	Distance(const TCoordinate &, TReal32 &)
IMPORT_C TReal64	Latitude()
IMPORT_C TReal64	Longitude()
IMPORT_C TInt	Move(TReal32, TReal32)
IMPORT_C void	SetCoordinate(const TReal64 &, const TReal64 &)
IMPORT_C void	SetCoordinate(const TReal64 &, const TReal64 &, TReal32)
IMPORT_C void	SetDatum(TPositionDatumId)

Detailed Description

TCoordinate is used to hold the basic coordinates of a location (latitude, longitude and altitude).

Member Attribute Documentation

iAltitude

TReal32

iAltitude

[protected]

Altitude, defaults to WGS-84 format. Represented in meters.

iDatum

TPositionDatumId

iDatum

[protected]

The ID of the datum the coordinate is in, defaults to WGS-84 format.

iLatitude

TReal64

iLatitude

[protected]

Latitude, defaults to WGS-84 format. Represented in degree.

iLongitude

TReal64

iLongitude

[protected]

Longitude, defaults to WGS-84 format. Represented in degree.

iReserved

TUint8

iReserved

[protected]

Unused variable for future expansion.

Constructor & Destructor Documentation

TCoordinate ( )

IMPORT_C

TCoordinate

(

)

Default constructor for TCoordinate. Sets the member data to default values (NaN).

TCoordinate ( const TReal64 &, const TReal64 & )

IMPORT_C	TCoordinate	(	const TReal64 &	aLatitude,
			const TReal64 &	aLongitude
		)

Constructor for TCoordinate. Allows the client to set just latitude and longitude, and sets the altitude to its default value (NaN).

Parameter	Description
aLatitude	specifies an initial value for latitude.
aLongitude	specifies an initial value for longitude.

TCoordinate ( const TReal64 &, const TReal64 &, TReal32 )

IMPORT_C	TCoordinate	(	const TReal64 &	aLatitude,
			const TReal64 &	aLongitude,
			TReal32	aAltitude
		)

Constructor for TCoordinate. Allows the client to set the latitude, longitude and altitude.

Parameter	Description
aLatitude	specifies an initial value for latitude.
aLongitude	specifies an initial value for longitude.
aAltitude	specifies an initial value for altitude.

Member Function Documentation

Altitude ( )

IMPORT_C TReal32

Altitude

(

)

const

Accessor for altitude. The altitude is represented in meters.

Returns: the altitude component of this coordinate, in metres.

BearingTo ( const TCoordinate &, TReal32 & )

IMPORT_C TInt	BearingTo	(	const TCoordinate &	aTargetCoordinate,
			TReal32 &	aBearing
		)	const

This method calculates the bearing from this coordinate to the supplied coordinate.

Parameter	Description
aTargetCoordinate	is the supplied target coordinate.
aBearing	upon successful completion, this is set to the bearing from this coordinate to aTargetCoordinate, in degrees counting clockwise relative to true north.

Returns: a Symbian OS error code. KErrArgument if any of iLatitude, iLongitude, aTargetCoordinate.iLatitude or aTargetCoordinate.iLongitude are set to NaN. KErrPositionIncalculable if this coordinate is at a pole or if the two coordinates are the same or antipodal.

Datum ( )

IMPORT_C TPositionDatumId

Datum

(

)

const

Accessor for the datum.

Returns: the datum of this coordinate.

Distance ( const TCoordinate &, TReal32 & )

IMPORT_C TInt	Distance	(	const TCoordinate &	aCoordinate,
			TReal32 &	aDistance
		)	const

This method calculates the distance between this coordinate and the supplied coordinate.

Parameter	Description
aCoordinate	is another point to use in the calculation.
aDistance	upon successful completion, this is set to the distance between this coordinate and aCoordinate, in metres.

Returns: a Symbian OS error code. KErrArgument if any of iLatitude, iLongitude, aCoordinate.iLatitude or aCoordinate.iLongitude are set to NaN.

Latitude ( )

IMPORT_C TReal64

Latitude

(

)

const

Accessor for latitude. The latitude is represented in degrees.

Returns: the latitude component of this coordinate.

Longitude ( )

IMPORT_C TReal64

Longitude

(

)

const

Accessor for longitude. The longitude is represented in degrees.

Returns: the longitude component of this coordinate.

Move ( TReal32, TReal32 )

IMPORT_C TInt	Move	(	TReal32	aBearing,
			TReal32	aDistance
		)

This method moves this coordinate aDistance in the direction specified by aBearing

Parameter	Description
aBearing	is the direction to move this coordinate, in degrees counting clockwise relative to true north.
aDistance	is the distance to move this coordinate, in metres.

Returns: a Symbian OS error code. KErrArgument if any of iLongitude or iLatitude are set to NaN. KErrPositionIncalculable if this coordinate is at a pole.

SetCoordinate ( const TReal64 &, const TReal64 & )

IMPORT_C void	SetCoordinate	(	const TReal64 &	aLatitude,
			const TReal64 &	aLongitude
		)

This method assigns a new latitude and longitude to the object. The altitude is set to its default value.

Parameter	Description
aLatitude	specifies a new latitude. The latitude is represented in degrees.
aLongitude	specifies a new longitude. The longitude is represented in degrees.

SetCoordinate ( const TReal64 &, const TReal64 &, TReal32 )

IMPORT_C void	SetCoordinate	(	const TReal64 &	aLatitude,
			const TReal64 &	aLongitude,
			TReal32	aAltitude
		)

This method assigns a new latitude, longitude and altitude to the object.

Parameter	Description
aLatitude	specifies a new latitude. The latitude is represented in degrees.
aLongitude	specifies a new longitude. The longitude is represented in degrees.
aAltitude	specifies a new altitude. The altitude is represented in meters.

SetDatum ( TPositionDatumId )

IMPORT_C void

SetDatum

(

TPositionDatumId

aDatum

)

This method assigns a new datum to the object.

Parameter	Description
aDatum	specifies a new datum.