prajna.geo

Class Equirect

java.lang.Object

prajna.geo.Projection

prajna.geo.Equirect

public class Equirect
extends Projection

Projection class representing Equirectangular projection. Equirectangular projection is defined as a simple mapping of latitude and longitude to cartesian coordinates. Any geoid eccentricity is ignored by this projection.

Author:

Edward Swing

Constructor Summary

Constructors

Constructor and Description
Equirect()

Method Summary

Methods

Modifier and Type	Method and Description
GeoCoord	getCoord(java.awt.Point point) Get the geographic coordinate which projects to the given screen coordinate.
java.awt.Shape	getWorldShape() Get the world shape for this projection.
java.awt.Point	project(GeoCoord coord) Project a geographic coordinate into screen coordinates
java.awt.Point[]	project(GeoCoord[] coords) Project a series of geographic coordinate into screen coordinates
protected void	rescale() Rescales the projection.
void	setGeoBounds(GeoBounds bounds) Set the geographic bounds for the projection.
void	setViewBounds(java.awt.Rectangle bounds) Set the view bounds.

Methods inherited from class prajna.geo.Projection

getGeoBounds, getGeoid, getProjCenter, getViewBounds, setGeoid, setProjCenter, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Equirect

public Equirect()

Method Detail

getCoord

public GeoCoord getCoord(java.awt.Point point)

Get the geographic coordinate which projects to the given screen coordinate.

Specified by:

getCoord in class Projection

Parameters:

point - a point in screen coordinates

Returns:

the geographic coordinate

getWorldShape

public java.awt.Shape getWorldShape()

Get the world shape for this projection. This method determines the shape of the world extent, and returns the corresponding shape.

Specified by:

getWorldShape in class Projection

Returns:

the shape of the world extent.

project

public java.awt.Point project(GeoCoord coord)

Project a geographic coordinate into screen coordinates

Specified by:

project in class Projection

Parameters:

coord - the geographic coordinate

Returns:

the screen coordinate

project

public java.awt.Point[] project(GeoCoord[] coords)

Project a series of geographic coordinate into screen coordinates

Specified by:

project in class Projection

Parameters:

coords - the geographic coordinates

Returns:

the series of screen coordinates

rescale

protected void rescale()

Rescales the projection. This method is called whenever the extents are changed.

Specified by:

rescale in class Projection

setGeoBounds

public void setGeoBounds(GeoBounds bounds)

Set the geographic bounds for the projection. The exact area displayed is dependent on the projection. The bounds are in radian coordinates

Overrides:

setGeoBounds in class Projection

Parameters:

bounds - the geographic bounds

setViewBounds

public void setViewBounds(java.awt.Rectangle bounds)

Set the view bounds. The view bounds are specified in view coordinates - e.g., pixels on the screen

Overrides:

setViewBounds in class Projection

Parameters:

bounds - the view bounds for the projection