IlvEquidistantCylindricalProjection Class Reference

This class defines the Equidistant Cylindrical projection. More...

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

Inheritance diagram for IlvEquidistantCylindricalProjection:

List of all members.

Public Member Functions
	IlvEquidistantCylindricalProjection ()
	Constructor.
virtual IlvProjection *	copy () const
	Returns a copy of the projection. It must be overridden in each subclass.
virtual IlvProjectionClassInfo *	getClassInfo () const
	Returns the class information for the projection.
IlDouble	getLatitudeOfTrueScale () const
	Returns the latitude of the true scale in radians.
void	setLatitudeOfTrueScale (IlDouble latitudeOfTrueScale)
	Sets the latitude of the true scale in radians.
virtual void	write (IlvOutputFile &) const
	Saves the parameters of a projection to the specified output file.
Static Public Member Functions
static IlvProjectionClassInfo *	ClassInfo ()
	Returns the class information of the class.
static IlvClassInfo **	ClassInfoRef ()
	Returns the address of the class information of the class.
Protected Member Functions
virtual IlvMapsError	sForward (IlvCoordinate &ll) const
	Must be redefined in subclasses to implement the projection for a sphere.
virtual IlvMapsError	sInverse (IlvCoordinate &xy) const
	Must be redefined in subclasses to implement the inverse projection for a sphere.

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Detailed Description

This class defines the Equidistant Cylindrical projection.

A cylindrical projection is obtained by wrapping a large flat plane around the globe to form a cylinder. The Equidistant Cylindrical projection simply multiplies the latitudes and longitudes by a scale factor. The latitude of the true scale can be specified.
Equidistant Cylindrical projections are also known as:

• EquiRectangular
• Plate Caree

This type of projection does not support non-spherical ellipsoids and is neither Conformal nor Equal Area.

Equidistant Cylindrical Projection

Library: ilvmaps

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Constructor & Destructor Documentation

IlvEquidistantCylindricalProjection::IlvEquidistantCylindricalProjection

(

)

Constructor.

Initializes an instance of the IlvEquidistantCylindricalProjection class.

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Member Function Documentation

static IlvProjectionClassInfo* IlvEquidistantCylindricalProjection::ClassInfo

(

)

[static]

Returns the class information of the class.

This static function is also available for the subclasses of IlvProjection.

Returns:

The IlvProjectionClassInfo of the class.

Reimplemented from IlvProjection.

static IlvClassInfo** IlvEquidistantCylindricalProjection::ClassInfoRef

(

)

[static]

Returns the address of the class information of the class.

This static function is also available for the subclasses of IlvProjection.

Returns:

The address of the IlvProjectionClassInfo of the class.

Reimplemented from IlvProjection.

virtual IlvProjection* IlvEquidistantCylindricalProjection::copy

(

)

const [virtual]

Returns a copy of the projection. It must be overridden in each subclass.

Returns:

The copy of the object.

Implements IlvProjection.

virtual IlvProjectionClassInfo* IlvEquidistantCylindricalProjection::getClassInfo

(

)

const [virtual]

Returns the class information for the projection.

Returns:

The class information for the projection.

Reimplemented from IlvProjection.

IlDouble IlvEquidistantCylindricalProjection::getLatitudeOfTrueScale

(

)

const

Returns the latitude of the true scale in radians.

Returns:

The latitude of the true scale.

void IlvEquidistantCylindricalProjection::setLatitudeOfTrueScale

(

IlDouble

latitudeOfTrueScale

)

Sets the latitude of the true scale in radians.

Parameters:

The

latitude of the true scale.

virtual IlvMapsError IlvEquidistantCylindricalProjection::sForward

(

IlvCoordinate &

ll

)

const [protected, virtual]

Must be redefined in subclasses to implement the projection for a sphere.

Parameters:

ll

Contains the longitude and latitude coordinates in radian (x = longitude, y = latitude).

Implements IlvProjection.

virtual IlvMapsError IlvEquidistantCylindricalProjection::sInverse

(

IlvCoordinate &

xy

)

const [protected, virtual]

Must be redefined in subclasses to implement the inverse projection for a sphere.

The default implementation returns IlvProjection::UnsupportedFeatureError().

Parameters:

xy

Contains the Cartesian coordinates to inverse.

Returns:

An error code.

Reimplemented from IlvProjection.

virtual void IlvEquidistantCylindricalProjection::write

(

IlvOutputFile &

outputFile

)

const [virtual]

Saves the parameters of a projection to the specified output file.

It must be overridden by subclasses of IlvProjection that need to save additional parameters. This function should not be directly called; use the save function instead.

Parameters:

outputFile

The file to write the projection parameters to.

Reimplemented from IlvProjection.