Package org.apache.sis.referencing.operation.projection

Class Orthographic

Object

FormattableObject

AbstractMathTransform

AbstractMathTransform2D

NormalizedProjection

Orthographic

All Implemented Interfaces:

Serializable, Parameterized, Lenient­Comparable, Math­Transform, Math­Transform2D

public class Orthographic
extends NormalizedProjection

Orthographic projection (EPSG:9840). See the following references for an overview:

• Orthographic projection on Wikipedia
• Orthographic projection on MathWorld

Description

This is a perspective azimuthal (planar) projection that is neither conformal nor equal-area. It resembles a globe viewed from a point of perspective at infinite distance. Only one hemisphere can be seen at a time. While not useful for accurate measurements, this projection is useful for pictorial views of the world.

Since:

1.1

See Also:

• Serialized Form

Defined in the sis-referencing module

Nested Class Summary

Nested classes/interfaces inherited from class NormalizedProjection

Normalized­Projection.Parameter­Role

Field Summary

Fields inherited from class NormalizedProjection

eccentricity, eccentricity­Squared

Constructor Summary

Constructors

Constructor	Description
Orthographic(Operation­Method method, Parameters parameters)	Creates an orthographic projection from the given parameters.

Method Summary

Modifier and Type	Method	Description
protected void	inverse­Transform(double[] src­Pts, int src­Off, double[] dst­Pts, int dst­Off)	Converts the specified (x,y) coordinates and stores the result in dst­Pts (angles in radians).
Matrix	transform(double[] src­Pts, int src­Off, double[] dst­Pts, int dst­Off, boolean derivate)	Converts the specified (λ,φ) coordinate and stores the (x,y) result in dst­Pts.

Methods inherited from class NormalizedProjection

compute­Hash­Code, create­Map­Projection, equals, get­Contextual­Parameters, get­Parameter­Descriptors, get­Parameter­Values, inverse, try­Concatenate

Methods inherited from class AbstractMathTransform2D

create­Transformed­Shape, derivative, get­Source­Dimensions, get­Target­Dimensions, transform

Methods inherited from class AbstractMathTransform

derivative, equals, format­To, hash­Code, is­Identity, transform, transform, transform, transform, transform

Methods inherited from class FormattableObject

print, to­String, to­String, to­WKT

Methods inherited from class Object

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

Methods inherited from interface MathTransform

derivative, is­Identity, to­WKT, transform, transform, transform, transform, transform

Constructor Details

Orthographic

public Orthographic(OperationMethod method,
 Parameters parameters)

Creates an orthographic projection from the given parameters. The method argument can be the description of one of the following:

• "Orthographic".

Parameters:

method - description of the projection parameters.

parameters - the parameter values of the projection to create.

Method Details

transform

public Matrix transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 boolean derivate)
                 throws ProjectionException

Converts the specified (λ,φ) coordinate and stores the (x,y) result in dst­Pts. The units of measurement are implementation-specific (see super-class javadoc).

Specified by:

transform in class Normalized­Projection

Parameters:

src­Pts - the array containing the source point coordinate, as (longitude, latitude) angles in radians.

src­Off - the offset of the single coordinate to be converted in the source array.

dst­Pts - the array into which the converted coordinate is returned (may be the same than src­Pts). Coordinates will be expressed in a dimensionless unit, as a linear distance on a unit sphere or ellipse.

dst­Off - the offset of the location of the converted coordinate that is stored in the destination array.

derivate - true for computing the derivative, or false if not needed.

Returns:

the matrix of the projection derivative at the given source position, or null if the derivate argument is false.

Throws:

Projection­Exception - if the coordinate can not be converted.

See Also:

• Abstract­Math­Transform.derivative(Direct­Position)
• Abstract­Math­Transform.transform(Direct­Position, Direct­Position)
• Math­Transforms.derivative­And­Transform(Math­Transform, double[], int, double[], int)

inverseTransform

protected void inverseTransform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff)
                         throws ProjectionException

Converts the specified (x,y) coordinates and stores the result in dst­Pts (angles in radians).

Specified by:

inverse­Transform in class Normalized­Projection

Parameters:

src­Pts - the array containing the source point coordinate, as linear distance on a unit sphere or ellipse.

src­Off - the offset of the point to be converted in the source array.

dst­Pts - the array into which the converted point coordinate is returned (may be the same than src­Pts). Coordinates will be (longitude, latitude) angles in radians.

dst­Off - the offset of the location of the converted point that is stored in the destination array.

Throws:

Projection­Exception - if the point can not be converted.