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Maps Package API Reference Guide

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IlvEquidistantCylindricalProjection Class Reference

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

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

Inheritance diagram for IlvEquidistantCylindricalProjection:
IlvProjection

List of all members.

Public Member Functions

 IlvEquidistantCylindricalProjection ()
 Constructor.
virtual IlvProjectioncopy () const
 Returns a copy of the projection. It must be overridden in each subclass.
virtual IlvProjectionClassInfogetClassInfo () 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 IlvProjectionClassInfoClassInfo ()
 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.

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:

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

EquidistantCylindrical.jpg


Equidistant Cylindrical Projection

Library: ilvmaps


Constructor & Destructor Documentation

IlvEquidistantCylindricalProjection::IlvEquidistantCylindricalProjection (  ) 

Constructor.

Initializes an instance of the IlvEquidistantCylindricalProjection class.


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.


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