jview
Class CylindricalEquidistantProjection

java.lang.Object
  jview.AbstractFormattingTransform
      jview.CylindricalProjection
          jview.CylindricalEquidistantProjection

All Implemented Interfaces:

CoordinateTransforming, DeltaFormattedTransforming, DeltaTransforming, FormattedTransforming

public class CylindricalEquidistantProjection
extends CylindricalProjection

A cylindrical equal area projection transforms y with the sine rather than the tangent,

   x = confine360(λ-λ_0+180.)/360.
   y = 0.5*(1.-φ/90)
   

Note that scaling factors stemming from standard parallel vaporize in normalized coordinates.

Field Summary

private double	lpart If only a part of the world is shown, this is < 360.
private double	phi0 If center of projection is not equator.
private double	ppart If only a part of the world is shown, this is < 180.

Fields inherited from class jview.CylindricalProjection

lambda0, TOPLATITUDE

Constructor Summary

CylindricalEquidistantProjection()
Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEquidistantProjection(double l0)
Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEquidistantProjection(double l0, double p0, double ls, double ps)
Construct a new CylindricalEqualAreaProjection for Greenwhich.

Method Summary

protected double	getLambda(Point2D norm) The standard cylindrical projection uses
protected double	getPhi(Point2D norm) Inversion formular is (1-2y)*90
protected double	getX(VectorG lamphi) The standard cylindrical projection uses
protected double	getY(VectorG lamphi) We calculate y from

Methods inherited from class jview.CylindricalProjection

deduceFormat, estimateX, estimateY, getScale, setSexagesimal, toNormalizedDistance, toNormalizedSpace, toUserDistance, toUserSpace

Methods inherited from class jview.AbstractFormattingTransform

deltaFormatUserSpaceX, deltaFormatUserSpaceY, formatUserCoordinates, formatUserSpaceX, formatUserSpaceY, getFormatUserX, getFormatUserY, setDeltaFormatUserX, setDeltaFormatUserY, setFormatUserX, setFormatUserY, useEstimatedFormats

Methods inherited from class java.lang.Object

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

Field Detail

phi0

private double phi0

If center of projection is not equator.

lpart

private double lpart

If only a part of the world is shown, this is < 360.

ppart

private double ppart

If only a part of the world is shown, this is < 180.

Constructor Detail

CylindricalEquidistantProjection

public CylindricalEquidistantProjection()

Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEquidistantProjection

public CylindricalEquidistantProjection(double l0)

Construct a new CylindricalEqualAreaProjection for Greenwhich.

CylindricalEquidistantProjection

public CylindricalEquidistantProjection(double l0,
                                        double p0,
                                        double ls,
                                        double ps)

Construct a new CylindricalEqualAreaProjection for Greenwhich.

Method Detail

getX

protected double getX(VectorG lamphi)

The standard cylindrical projection uses

       x = confine360(λ-λ_0+180.)/360.
       

Overrides:

getX in class CylindricalProjection

getY

protected double getY(VectorG lamphi)

We calculate y from

       y = 0.5*(1.-φ/90)
       

Overrides:

getY in class CylindricalProjection

getLambda

protected double getLambda(Point2D norm)

The standard cylindrical projection uses

       λ=confine360(360*x+λ_0)-180.
       

Overrides:

getLambda in class CylindricalProjection

getPhi

protected double getPhi(Point2D norm)

Inversion formular is (1-2y)*90

Overrides:

getPhi in class CylindricalProjection