com.ctreber.acearth.projection

Class ProjectionMerc

java.lang.Object

com.ctreber.acearth.projection.Projection

com.ctreber.acearth.projection.ProjectionMerc

public class ProjectionMerc
extends Projection

Mercator projection. Show Earth flatly spread out on rectangle.

© 2002 Christian Treber, ct@ctreber.com

Author:

Christian Treber, ct@ctreber.com

Constructor Summary

Constructors

Constructor and Description
ProjectionMerc()

Method Summary

Modifier and Type	Method and Description
Coordinate	getLocation(int pX, int pY) Translate screen point into coordinate on Earth.
double	inverseProjectX(double pX)
double	inverseProjectY(double y)
boolean	isVisible(Point3D pPoint) All of Earth is visible.
double	projectX(double pX, double pZ) Project 3D point on x axis.
double	projectY(double pY) Project 3D point on y axis.
protected void	setScale() The scale is set so that a value of 2PI gets mapped to the full image width times the magnification.

Methods inherited from class com.ctreber.acearth.projection.Projection

finalize, finalizeX, finalizeY, getScale, getViewPos, initTransformTable, inverseFinalizeX, inverseFinalizeY, isWithinImage, project2D, rotate, rotateReverse, setImageHeight, setImageWidth, setShiftX, setShiftY, setViewMagnification, setViewPos, setViewRotation

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectionMerc

public ProjectionMerc()

Method Detail

isVisible

public boolean isVisible(Point3D pPoint)

All of Earth is visible.

Specified by:

isVisible in class Projection

Parameters:

pPoint -

Returns:

getLocation

public Coordinate getLocation(int pX,
                              int pY)

Description copied from class: Projection

Translate screen point into coordinate on Earth.

Specified by:

getLocation in class Projection

Returns:

setScale

protected void setScale()

The scale is set so that a value of 2PI gets mapped to the full image width times the magnification. But see ProjectionOrtho.setScale().

Specified by:

setScale in class Projection

projectX

public double projectX(double pX,
                       double pZ)

Description copied from class: Projection

Project 3D point on x axis.

Specified by:

projectX in class Projection

Returns:

Longitude (-PI to PI), linearly on x axis.

inverseProjectX

public double inverseProjectX(double pX)

Specified by:

inverseProjectX in class Projection

projectY

public double projectY(double pY)

Description copied from class: Projection

Project 3D point on y axis.

Specified by:

projectY in class Projection

Returns:

Latitude (-PI/2 to PI/2), projected from center of Earth on y axis with a twist and a log scale.

inverseProjectY

public double inverseProjectY(double y)

Specified by:

inverseProjectY in class Projection