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Maps Package API Reference Guide

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IlvMercatorProjection Class Reference

This class defines the Mercator projection. More...

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

Inheritance diagram for IlvMercatorProjection:
IlvProjection

List of all members.

Public Member Functions

 IlvMercatorProjection (IlDouble latitudeOfTrueScale=0.)
 Creates an instance of the class IlvMercatorProjection and specifies the latitude of the true scale.
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 radian.
virtual IlvMapsError setEllipsoid (const IlvEllipsoid &ellipsoid)
 Sets the ellipsoid used for the projection.
void setLatitudeOfTrueScale (IlDouble latitudeOfTrueScale)
 Sets the latitude of the true scale in radian.
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 eForward (IlvCoordinate &ll) const
 Must be redefined in subclasses to implement the projection for a non spherical ellipsoid.
virtual IlvMapsError eInverse (IlvCoordinate &xy) const
 Implements the inverse projection for a non spherical ellipsoid.
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 Mercator projection.

The Mercator projection, also known as the Wright projection, is the projection of a sphere on a cylinder that is tangent to the equator. Mercator projections should be limited to equatorial regions, but are frequently used for navigational charts with a latitude of the true scale specified within or near the chart boundaries. With this projection, the regions near the poles cannot be shown.
This projection applies both to spherical and non-spherical ellipsoids and implements an inverse function.
This projection is Conformal.

Mercator.jpg


Mercator Projection

Library: ilvmaps


Constructor & Destructor Documentation

IlvMercatorProjection::IlvMercatorProjection ( IlDouble  latitudeOfTrueScale = 0.  ) 

Creates an instance of the class IlvMercatorProjection and specifies the latitude of the true scale.

Parameters:
latitudeOfTrueScale The latitude of the true scale.

Member Function Documentation

static IlvProjectionClassInfo* IlvMercatorProjection::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** IlvMercatorProjection::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* IlvMercatorProjection::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 IlvMapsError IlvMercatorProjection::eForward ( IlvCoordinate ll  )  const [protected, virtual]

Must be redefined in subclasses to implement the projection for a non spherical ellipsoid.

The default implementation returns IlvProjection::UnsupportedFeatureError().

Parameters:
ll Contains the longitude and latitude coordinates in radian (x = longitude, y = latitude).
Returns:
An error code.

Reimplemented from IlvProjection.

virtual IlvMapsError IlvMercatorProjection::eInverse ( IlvCoordinate xy  )  const [protected, virtual]

Implements the inverse projection for a non spherical ellipsoid.

The default implementation returns IlvProjection::UnsupportedFeatureError().

Parameters:
xy Contains the Cartesian coordinates to inverse.
Returns:
An error code.

Reimplemented from IlvProjection.

virtual IlvProjectionClassInfo* IlvMercatorProjection::getClassInfo (  )  const [virtual]

Returns the class information for the projection.

Returns:
The class information for the projection.

Reimplemented from IlvProjection.

IlDouble IlvMercatorProjection::getLatitudeOfTrueScale (  )  const

Returns the latitude of the true scale in radian.

Returns:
The latitude of the true scale.
virtual IlvMapsError IlvMercatorProjection::setEllipsoid ( const IlvEllipsoid ellipsoid  )  [virtual]

Sets the ellipsoid used for the projection.

This virtual member function sets the ellipsoid used for the projection. Most of the projections are initialized with a spherical ellipsoid with a radius of 6,370,997 meters.
This function returns IlvMaps::NoError() if the operation is successful or an error status if you specify a non spherical ellipsoid and your type does not support non spherical.

Parameters:
ellipsoid The ellipsoid used for the projection.
Returns:
IlvMapsError if the ellipsoid does not match the projection.

Reimplemented from IlvProjection.

void IlvMercatorProjection::setLatitudeOfTrueScale ( IlDouble  latitudeOfTrueScale  ) 

Sets the latitude of the true scale in radian.

Parameters:
latitudeOfTrueScale The latitude of the true scale.
virtual IlvMapsError IlvMercatorProjection::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 IlvMercatorProjection::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 IlvMercatorProjection::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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