ilog.views.maps.projection
Class IlvMercatorProjection

java.lang.Object
  ilog.views.maps.projection.IlvProjection
      ilog.views.maps.projection.IlvMercatorProjection

All Implemented Interfaces:

IlvPersistentObject, Serializable

public class IlvMercatorProjection
extends IlvProjection

The Mercator projection, also known as the Wright projection, is the projection of a sphere on a cylinder which 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's 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.

See Also:

Serialized Form

Field Summary

Fields inherited from class ilog.views.maps.projection.IlvProjection

CONFORMAL, EQUAL_AREA, NONE

Constructor Summary

IlvMercatorProjection()
Creates an instance of the class IlvMercatorProjection.

IlvMercatorProjection(double latitudeOfTrueScale)
Creates an instance of the class IlvMercatorProjection and specifies the latitude of the true scale.

IlvMercatorProjection(IlvInputStream stream)
Reads the object from an IlvInputStream.

IlvMercatorProjection(IlvMercatorProjection source)
Creates a new IlvMercatorProjection by copying an existing one.

Method Summary

IlvProjection	copy() Copies the projection.
protected void	eForward(IlvCoordinate ll) Implements the projection for an ellipsoid.
protected void	eInverse(IlvCoordinate xy) Implements the inverse projection for an ellipsoid.
double	getLatitudeOfTrueScale() Returns the latitude of the true scale.
void	setEllipsoid(IlvEllipsoid ellipsoid) Sets the ellipsoid used for the projection.
void	setLatitudeOfTrueScale(double latitudeOfTrueScale) Sets the latitude of the true scale.
protected void	sForward(IlvCoordinate ll) Implements the projection for a sphere.
protected void	sInverse(IlvCoordinate xy) Implements the inverse projection for a sphere.
String	toString() Converts the projection to a string with Evenden's format.
void	write(IlvOutputStream stream) Writes the object to an IlvOutputStream.

Methods inherited from class ilog.views.maps.projection.IlvProjection

addDescription, adjustLongitude, equals, forward, forward, getCentralMeridian, getCentralParallel, getDatum, getEllipsoid, getFalseEasting, getFalseNorthing, GetProjection, getProperty, getUnit, getXYOffset, inverse, inverse, inverse, isEllipsoidEnabled, isGeocentric, isInverseEnabled, isUsingLongitudeReduction, setCentralMeridian, setCentralParallel, setDatum, setFalseEasting, setFalseNorthing, setGeocentric, setLLCenter, setUnit, setUsingLongitudeReduction, setXYOffset

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

IlvMercatorProjection

public IlvMercatorProjection()

Creates an instance of the class IlvMercatorProjection.

IlvMercatorProjection

public IlvMercatorProjection(double latitudeOfTrueScale)

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

Parameters:

latitudeOfTrueScale - the latitude of the true scale in radians.

IlvMercatorProjection

public IlvMercatorProjection(IlvInputStream stream)
                      throws IlvReadFileException

Reads the object from an IlvInputStream.

Parameters:

stream - the input stream.

Throws:

IlvReadFileException - if the format is not correct.

Since:

JViews 3.0

IlvMercatorProjection

public IlvMercatorProjection(IlvMercatorProjection source)

Creates a new IlvMercatorProjection by copying an existing one.

Parameters:

source - the projection that is copied.

Since:

JViews 3.0

Method Detail

copy

public IlvProjection copy()

Copies the projection.

Specified by:

copy in class IlvProjection

Returns:

a copy of the projection.

Since:

JViews 3.0

sForward

protected void sForward(IlvCoordinate ll)
                 throws IlvToleranceConditionException

Implements the projection for a sphere.

Specified by:

sForward in class IlvProjection

Parameters:

ll - the longitude/latitude coordinates in radians (x = longitude, y = latitude)

Throws:

IlvToleranceConditionException - if the values are not within the tolerated limits.

eForward

protected void eForward(IlvCoordinate ll)
                 throws IlvToleranceConditionException

Implements the projection for an ellipsoid.

Overrides:

eForward in class IlvProjection

Parameters:

ll - the longitude/latitude coordinates in radians (x = longitude, y = latitude)

Throws:

IlvToleranceConditionException - if the values are not within the tolerated limits.

sInverse

protected void sInverse(IlvCoordinate xy)

Implements the inverse projection for a sphere.

Overrides:

sInverse in class IlvProjection

Parameters:

xy - the Cartesian coordinates.

See Also:

IlvProjection.inverse(ilog.views.IlvPoint), IlvProjection.isInverseEnabled()

eInverse

protected void eInverse(IlvCoordinate xy)
                 throws IlvToleranceConditionException

Implements the inverse projection for an ellipsoid.

Overrides:

eInverse in class IlvProjection

Parameters:

xy - the Cartesian coordinates.

Throws:

IlvToleranceConditionException - if the values are not within the tolerated limits.

See Also:

IlvProjection.inverse(ilog.views.IlvPoint), IlvProjection.isEllipsoidEnabled(), IlvProjection.isInverseEnabled()

setEllipsoid

public void setEllipsoid(IlvEllipsoid ellipsoid)

Sets the ellipsoid used for the projection. This function also updates the projection parameters for the given ellipsoid.

Overrides:

setEllipsoid in class IlvProjection

Parameters:

ellipsoid - the ellipsoid

See Also:

IlvEllipsoid

setLatitudeOfTrueScale

public void setLatitudeOfTrueScale(double latitudeOfTrueScale)

Sets the latitude of the true scale.

Parameters:

latitudeOfTrueScale - the latitude in radians

getLatitudeOfTrueScale

public final double getLatitudeOfTrueScale()

Returns the latitude of the true scale.

Returns:

the latitude of the true scale in radians.

write

public void write(IlvOutputStream stream)
           throws IOException

Writes the object to an IlvOutputStream.

Specified by:

write in interface IlvPersistentObject

Overrides:

write in class IlvProjection

Parameters:

stream - the output stream.

Throws:

IOException - thrown when an exception occurs during the write operation for this object.

Since:

JViews 3.0

toString

public String toString()

Converts the projection to a string with Evenden's format.

Overrides:

toString in class Object