Package org.orekit.models.earth.tessellation

Class Tile

java.lang.Object

org.orekit.models.earth.tessellation.Tile

All Implemented Interfaces:

Serializable

public class Tile
extends Object
implements Serializable

Simple data structure for a quadrilateral tile shape on a body surface.

This class is devoted to simple usage only. It assumes the edges are strictly between 0 and π radians and that the angles between edges are also strictly between 0 and π radians.

Author:

Luc Maisonobe

See Also:

AlongTrackAiming, ConstantAzimuthAiming, Serialized Form

Constructor Summary

Constructors

Constructor	Description
Tile(GeodeticPoint v0, GeodeticPoint v1, GeodeticPoint v2, GeodeticPoint v3)	Create a tile.

Method Summary

Modifier and Type	Method	Description
GeodeticPoint	getCenter()	Get the center point.
GeodeticPoint	getInterpolatedPoint(double u, double v)	Get an interpolated point inside the tile.
GeodeticPoint[]	getVertices()	Get the four vertices.

Methods inherited from class java.lang.Object

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

Constructor Detail

Tile

public Tile(GeodeticPoint v0,
            GeodeticPoint v1,
            GeodeticPoint v2,
            GeodeticPoint v3)

Create a tile.

It is caller responsibility o ensure the vertices define a simple non-degenerated tile (i.e. edges are strictly between 0 than π radians and angles between edges are also strictly between 0 and π radians). No checks are performed here.

Parameters:

v0 - first vertex

v1 - second vertex

v2 - third vertex

v3 - fourth vertex

Method Detail

getVertices

public GeodeticPoint[] getVertices()

Get the four vertices.

Returns:

four vertices

getInterpolatedPoint

public GeodeticPoint getInterpolatedPoint(double u,
                                          double v)

Get an interpolated point inside the tile.

The interpolated point is based on bilinear interpolations along the body surface assumed to be spherical, and along the vertical axis.

The interpolation parameters are chosen such that (u = 0, v = 0) maps to vertex v0, (u = 1, v = 0) maps to vertex v1, (u = 1, v = 1) maps to vertex v2 and (u = 0, v = 1) maps to vertex v3.

Parameters:

u - first interpolation parameter (should be between 0 and 1 to remain inside the tile)

v - second interpolation parameter (should be between 0 and 1 to remain inside the tile)

Returns:

interpolated point

getCenter

public GeodeticPoint getCenter()

Get the center point.

The center points corresponds to getInterpolatedPoint(0.5, 0.5)

Returns:

center point