org.apache.lucene.spatial3d.geom

Class Plane

java.lang.Object

org.apache.lucene.spatial3d.geom.Vector

org.apache.lucene.spatial3d.geom.Plane

Direct Known Subclasses:

SidedPlane

public class Plane
extends Vector

We know about three kinds of planes. First kind: general plain through two points and origin Second kind: horizontal plane at specified height. Third kind: vertical plane with specified x and y value, through origin.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
double	D Ax + By + Cz + D = 0
static Membership[]	NO_BOUNDS An array with no bounds in it
static GeoPoint[]	NO_POINTS An array with no points in it
static Plane	normalXPlane A vertical plane normal to the X axis
static Plane	normalYPlane A vertical plane normal to the Y axis
static Plane	normalZPlane A vertical plane normal to the Z axis

Fields inherited from class org.apache.lucene.spatial3d.geom.Vector

MINIMUM_ANGULAR_RESOLUTION, MINIMUM_RESOLUTION, MINIMUM_RESOLUTION_CUBED, MINIMUM_RESOLUTION_SQUARED, x, y, z

Constructor Summary

Constructors

Constructor and Description
Plane(double x, double y) Construct a vertical plane through a specified x, y and origin.
Plane(double A, double B, double C, double D) Construct a plane with all four coefficients defined.
Plane(Plane basePlane, boolean above) Construct a plane that is parallel to the one provided, but which is just barely numerically distinguishable from it, in the direction desired.
Plane(PlanetModel planetModel, double sinLat) Construct a horizontal plane at a specified Z.
Plane(Vector v, double D) Construct a plane with a specific vector, and D offset from origin.
Plane(Vector A, double BX, double BY, double BZ) Construct a plane through two points and origin.
Plane(Vector A, Vector B) Construct a plane through two points and origin.

Method Summary

Modifier and Type	Method and Description
double	arcDistance(PlanetModel planetModel, double x, double y, double z, Membership... bounds) Compute arc distance from plane to a vector.
double	arcDistance(PlanetModel planetModel, GeoPoint v, Membership... bounds) Compute arc distance from plane to a vector expressed with a GeoPoint.
static boolean	arePointsCoplanar(GeoPoint A, GeoPoint B, GeoPoint C) Checks if three points are coplanar in any of the three planes they can describe.
static Plane	constructNormalizedXPlane(double y, double z, double DValue) Construct a normalized plane through a y-z point and parallel to the X axis.
static Plane	constructNormalizedXPlane(Vector... planePoints) Construct the most accurate normalized plane through an y-z point and including the X axis.
static Plane	constructNormalizedYPlane(double x, double z, double DValue) Construct a normalized plane through an x-z point and parallel to the Y axis.
static Plane	constructNormalizedYPlane(Vector... planePoints) Construct the most accurate normalized plane through an x-z point and including the Y axis.
static Plane	constructNormalizedZPlane(double x, double y) Construct a normalized plane through an x-y point and including the Z axis.
static Plane	constructNormalizedZPlane(Vector... planePoints) Construct the most accurate normalized plane through an x-y point and including the Z axis.
boolean	crosses(PlanetModel planetModel, Plane q, GeoPoint[] notablePoints, GeoPoint[] moreNotablePoints, Membership[] bounds, Membership... moreBounds) Determine whether the plane crosses another plane within the bounds provided.
boolean	equals(Object o)
double	evaluate(double x, double y, double z) Evaluate the plane equation for a given point, as represented by a vector.
double	evaluate(Vector v) Evaluate the plane equation for a given point, as represented by a vector.
boolean	evaluateIsZero(double x, double y, double z) Evaluate the plane equation for a given point, as represented by a vector.
boolean	evaluateIsZero(Vector v) Evaluate the plane equation for a given point, as represented by a vector.
GeoPoint[]	findArcDistancePoints(PlanetModel planetModel, double arcDistanceValue, GeoPoint startPoint, Membership... bounds) Locate a point that is within the specified bounds and on the specified plane, that has an arcDistance as specified from the startPoint.
GeoPoint[]	findCrossings(PlanetModel planetModel, Plane q, Membership... bounds) Find the points between two planes, where one plane crosses the other, given a set of bounds.
protected GeoPoint[]	findCrossings(PlanetModel planetModel, Plane q, Membership[] bounds, Membership[] moreBounds) Find the points between two planes, where one plane crosses the other, given a set of bounds.
protected void	findIntersectionBounds(PlanetModel planetModel, Bounds boundsInfo, Plane q, Membership... bounds) Record intersection points for planes with error bounds.
GeoPoint[]	findIntersections(PlanetModel planetModel, Plane q, Membership... bounds) Find the intersection points between two planes, given a set of bounds.
protected GeoPoint[]	findIntersections(PlanetModel planetModel, Plane q, Membership[] bounds, Membership[] moreBounds) Find the intersection points between two planes, given a set of bounds.
GeoPoint	getSampleIntersectionPoint(PlanetModel planetModel, Plane q) Find a sample point on the intersection between two planes and the world.
int	hashCode()
GeoPoint[]	interpolate(PlanetModel planetModel, GeoPoint start, GeoPoint end, double[] proportions) Find points on the boundary of the intersection of a plane and the unit sphere, given a starting point, and ending point, and a list of proportions of the arc (e.g.
boolean	intersects(PlanetModel planetModel, Plane q, GeoPoint[] notablePoints, GeoPoint[] moreNotablePoints, Membership[] bounds, Membership... moreBounds) Determine whether the plane intersects another plane within the bounds provided.
boolean	isFunctionallyIdentical(Plane p) Returns true if this plane and the other plane are functionally identical within the margin of error.
boolean	isNumericallyIdentical(Plane p) Returns true if this plane and the other plane are identical within the margin of error.
double	linearDistance(PlanetModel planetModel, double x, double y, double z, Membership... bounds) Compute linear distance from plane to a vector.
double	linearDistance(PlanetModel planetModel, GeoPoint v, Membership... bounds) Compute linear distance from plane to a vector.
double	linearDistanceSquared(PlanetModel planetModel, double x, double y, double z, Membership... bounds) Compute linear distance squared from plane to a vector.
double	linearDistanceSquared(PlanetModel planetModel, GeoPoint v, Membership... bounds) Compute linear distance squared from plane to a vector.
protected static Vector	modify(GeoPoint start, double transX, double transY, double transZ, double sinRA, double cosRA, double sinHA, double cosHA) Modify a point to produce a vector in translated/rotated space.
double	normalDistance(double x, double y, double z, Membership... bounds) Compute normal distance from plane to a vector.
double	normalDistance(Vector v, Membership... bounds) Compute normal distance from plane to a vector.
double	normalDistanceSquared(double x, double y, double z, Membership... bounds) Compute normal distance squared from plane to a vector.
double	normalDistanceSquared(Vector v, Membership... bounds) Compute normal distance squared from plane to a vector.
Plane	normalize() Build a normalized plane, so that the vector is normalized.
void	recordBounds(PlanetModel planetModel, LatLonBounds boundsInfo, Membership... bounds) Accumulate bounds information for this plane, intersected with the unit sphere.
void	recordBounds(PlanetModel planetModel, LatLonBounds boundsInfo, Plane p, Membership... bounds) Accumulate bounds information for this plane, intersected with another plane and the world.
void	recordBounds(PlanetModel planetModel, XYZBounds boundsInfo, Membership... bounds) Accumulate (x,y,z) bounds information for this plane, intersected with the unit sphere.
void	recordBounds(PlanetModel planetModel, XYZBounds boundsInfo, Plane p, Membership... bounds) Accumulate (x,y,z) bounds information for this plane, intersected with another and the world.
protected static GeoPoint	reverseModify(PlanetModel planetModel, Vector point, double transX, double transY, double transZ, double sinRA, double cosRA, double sinHA, double cosHA) Reverse modify a point to produce a GeoPoint in normal space.
String	toString()

Methods inherited from class org.apache.lucene.spatial3d.geom.Vector

crossProductEvaluateIsZero, dotProduct, dotProduct, isNumericallyIdentical, isNumericallyIdentical, isParallel, isParallel, isWithin, linearDistance, linearDistance, linearDistanceSquared, linearDistanceSquared, magnitude, magnitude, normalDistance, normalDistance, normalDistanceSquared, normalDistanceSquared, rotateXY, rotateXY, rotateXZ, rotateXZ, rotateZY, rotateZY, translate

Methods inherited from class java.lang.Object

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

Field Detail

NO_POINTS

public static final GeoPoint[] NO_POINTS

An array with no points in it

NO_BOUNDS

public static final Membership[] NO_BOUNDS

An array with no bounds in it

normalYPlane

public static final Plane normalYPlane

A vertical plane normal to the Y axis

normalXPlane

public static final Plane normalXPlane

A vertical plane normal to the X axis

normalZPlane

public static final Plane normalZPlane

A vertical plane normal to the Z axis

D

public final double D

Ax + By + Cz + D = 0

Constructor Detail

Plane

public Plane(double A,
             double B,
             double C,
             double D)

Construct a plane with all four coefficients defined.

Parameters:

A - is A

B - is B

C - is C

D - is D

Plane

public Plane(Vector A,
             double BX,
             double BY,
             double BZ)

Construct a plane through two points and origin.

Parameters:

A - is the first point (origin based).

BX - is the second point X (origin based).

BY - is the second point Y (origin based).

BZ - is the second point Z (origin based).

Plane

public Plane(Vector A,
             Vector B)

Construct a plane through two points and origin.

Parameters:

A - is the first point (origin based).

B - is the second point (origin based).

Plane

public Plane(PlanetModel planetModel,
             double sinLat)

Construct a horizontal plane at a specified Z.

Parameters:

planetModel - is the planet model.

sinLat - is the sin(latitude).

Plane

public Plane(double x,
             double y)

Construct a vertical plane through a specified x, y and origin.

Parameters:

x - is the specified x value.

y - is the specified y value.

Plane

public Plane(Vector v,
             double D)

Construct a plane with a specific vector, and D offset from origin.

Parameters:

v - is the normal vector.

D - is the D offset from the origin.

Plane

public Plane(Plane basePlane,
             boolean above)

Construct a plane that is parallel to the one provided, but which is just barely numerically distinguishable from it, in the direction desired.

Parameters:

basePlane - is the starting plane.

above - is set to true if the desired plane is in the positive direction from the base plane, or false in the negative direction.

Method Detail

constructNormalizedZPlane

public static Plane constructNormalizedZPlane(Vector... planePoints)

Construct the most accurate normalized plane through an x-y point and including the Z axis. If none of the points can determine the plane, return null.

Parameters:

planePoints - is a set of points to choose from. The best one for constructing the most precise plane is picked.

Returns:

the plane

constructNormalizedYPlane

public static Plane constructNormalizedYPlane(Vector... planePoints)

Construct the most accurate normalized plane through an x-z point and including the Y axis. If none of the points can determine the plane, return null.

Parameters:

planePoints - is a set of points to choose from. The best one for constructing the most precise plane is picked.

Returns:

the plane

constructNormalizedXPlane

public static Plane constructNormalizedXPlane(Vector... planePoints)

Construct the most accurate normalized plane through an y-z point and including the X axis. If none of the points can determine the plane, return null.

Parameters:

planePoints - is a set of points to choose from. The best one for constructing the most precise plane is picked.

Returns:

the plane

constructNormalizedZPlane

public static Plane constructNormalizedZPlane(double x,
                                              double y)

Construct a normalized plane through an x-y point and including the Z axis. If the x-y point is at (0,0), return null.

Parameters:

x - is the x value.

y - is the y value.

Returns:

a plane passing through the Z axis and (x,y,0).

constructNormalizedYPlane

public static Plane constructNormalizedYPlane(double x,
                                              double z,
                                              double DValue)

Construct a normalized plane through an x-z point and parallel to the Y axis. If the x-z point is at (0,0), return null.

Parameters:

x - is the x value.

z - is the z value.

DValue - is the offset from the origin for the plane.

Returns:

a plane parallel to the Y axis and perpendicular to the x and z values given.

constructNormalizedXPlane

public static Plane constructNormalizedXPlane(double y,
                                              double z,
                                              double DValue)

Construct a normalized plane through a y-z point and parallel to the X axis. If the y-z point is at (0,0), return null.

Parameters:

y - is the y value.

z - is the z value.

DValue - is the offset from the origin for the plane.

Returns:

a plane parallel to the X axis and perpendicular to the y and z values given.

evaluate

public double evaluate(Vector v)

Evaluate the plane equation for a given point, as represented by a vector.

Parameters:

v - is the vector.

Returns:

the result of the evaluation.

evaluate

public double evaluate(double x,
                       double y,
                       double z)

Evaluate the plane equation for a given point, as represented by a vector.

Parameters:

x - is the x value.

y - is the y value.

z - is the z value.

Returns:

the result of the evaluation.

evaluateIsZero

public boolean evaluateIsZero(Vector v)

Evaluate the plane equation for a given point, as represented by a vector.

Parameters:

v - is the vector.

Returns:

true if the result is on the plane.

evaluateIsZero

public boolean evaluateIsZero(double x,
                              double y,
                              double z)

Evaluate the plane equation for a given point, as represented by a vector.

Parameters:

x - is the x value.

y - is the y value.

z - is the z value.

Returns:

true if the result is on the plane.

normalize

public Plane normalize()

Build a normalized plane, so that the vector is normalized.

Overrides:

normalize in class Vector

Returns:

the normalized plane object, or null if the plane is indeterminate.

arcDistance

public double arcDistance(PlanetModel planetModel,
                          GeoPoint v,
                          Membership... bounds)

Compute arc distance from plane to a vector expressed with a GeoPoint.

See Also:

arcDistance(PlanetModel, double, double, double, Membership...)

arcDistance

public double arcDistance(PlanetModel planetModel,
                          double x,
                          double y,
                          double z,
                          Membership... bounds)

Compute arc distance from plane to a vector.

Parameters:

planetModel - is the planet model.

x - is the x vector value.

y - is the y vector value.

z - is the z vector value.

bounds - are the bounds which constrain the intersection point.

Returns:

the arc distance.

normalDistance

public double normalDistance(Vector v,
                             Membership... bounds)

Compute normal distance from plane to a vector.

Parameters:

v - is the vector.

bounds - are the bounds which constrain the intersection point.

Returns:

the normal distance.

normalDistance

public double normalDistance(double x,
                             double y,
                             double z,
                             Membership... bounds)

Compute normal distance from plane to a vector.

Parameters:

x - is the vector x.

y - is the vector y.

z - is the vector z.

bounds - are the bounds which constrain the intersection point.

Returns:

the normal distance.

normalDistanceSquared

public double normalDistanceSquared(Vector v,
                                    Membership... bounds)

Compute normal distance squared from plane to a vector.

Parameters:

v - is the vector.

bounds - are the bounds which constrain the intersection point.

Returns:

the normal distance squared.

normalDistanceSquared

public double normalDistanceSquared(double x,
                                    double y,
                                    double z,
                                    Membership... bounds)

Compute normal distance squared from plane to a vector.

Parameters:

x - is the vector x.

y - is the vector y.

z - is the vector z.

bounds - are the bounds which constrain the intersection point.

Returns:

the normal distance squared.

linearDistance

public double linearDistance(PlanetModel planetModel,
                             GeoPoint v,
                             Membership... bounds)

Compute linear distance from plane to a vector. This is defined as the distance from the given point to the nearest intersection of this plane with the planet surface.

Parameters:

planetModel - is the planet model.

v - is the point.

bounds - are the bounds which constrain the intersection point.

Returns:

the linear distance.

linearDistance

public double linearDistance(PlanetModel planetModel,
                             double x,
                             double y,
                             double z,
                             Membership... bounds)

Compute linear distance from plane to a vector. This is defined as the distance from the given point to the nearest intersection of this plane with the planet surface.

Parameters:

planetModel - is the planet model.

x - is the vector x.

y - is the vector y.

z - is the vector z.

bounds - are the bounds which constrain the intersection point.

Returns:

the linear distance.

linearDistanceSquared

public double linearDistanceSquared(PlanetModel planetModel,
                                    GeoPoint v,
                                    Membership... bounds)

Compute linear distance squared from plane to a vector. This is defined as the distance from the given point to the nearest intersection of this plane with the planet surface.

Parameters:

planetModel - is the planet model.

v - is the point.

bounds - are the bounds which constrain the intersection point.

Returns:

the linear distance squared.

linearDistanceSquared

public double linearDistanceSquared(PlanetModel planetModel,
                                    double x,
                                    double y,
                                    double z,
                                    Membership... bounds)

Compute linear distance squared from plane to a vector. This is defined as the distance from the given point to the nearest intersection of this plane with the planet surface.

Parameters:

planetModel - is the planet model.

x - is the vector x.

y - is the vector y.

z - is the vector z.

bounds - are the bounds which constrain the intersection point.

Returns:

the linear distance squared.

interpolate

public GeoPoint[] interpolate(PlanetModel planetModel,
                              GeoPoint start,
                              GeoPoint end,
                              double[] proportions)

Find points on the boundary of the intersection of a plane and the unit sphere, given a starting point, and ending point, and a list of proportions of the arc (e.g. 0.25, 0.5, 0.75). The angle between the starting point and ending point is assumed to be less than pi.

Parameters:

planetModel - is the planet model.

start - is the start point.

end - is the end point.

proportions - is an array of fractional proportions measured between start and end.

Returns:

an array of points corresponding to the proportions passed in.

modify

protected static Vector modify(GeoPoint start,
                               double transX,
                               double transY,
                               double transZ,
                               double sinRA,
                               double cosRA,
                               double sinHA,
                               double cosHA)

Modify a point to produce a vector in translated/rotated space.

Parameters:

start - is the start point.

transX - is the translation x value.

transY - is the translation y value.

transZ - is the translation z value.

sinRA - is the sine of the ascension angle.

cosRA - is the cosine of the ascension angle.

sinHA - is the sine of the height angle.

cosHA - is the cosine of the height angle.

Returns:

the modified point.

reverseModify

protected static GeoPoint reverseModify(PlanetModel planetModel,
                                        Vector point,
                                        double transX,
                                        double transY,
                                        double transZ,
                                        double sinRA,
                                        double cosRA,
                                        double sinHA,
                                        double cosHA)

Reverse modify a point to produce a GeoPoint in normal space.

Parameters:

planetModel - is the planet model.

point - is the translated point.

transX - is the translation x value.

transY - is the translation y value.

transZ - is the translation z value.

sinRA - is the sine of the ascension angle.

cosRA - is the cosine of the ascension angle.

sinHA - is the sine of the height angle.

cosHA - is the cosine of the height angle.

Returns:

the original point.

findIntersections

public GeoPoint[] findIntersections(PlanetModel planetModel,
                                    Plane q,
                                    Membership... bounds)

Find the intersection points between two planes, given a set of bounds.

Parameters:

planetModel - is the planet model.

q - is the plane to intersect with.

bounds - are the bounds to consider to determine legal intersection points.

Returns:

the set of legal intersection points, or null if the planes are numerically identical.

findCrossings

public GeoPoint[] findCrossings(PlanetModel planetModel,
                                Plane q,
                                Membership... bounds)

Find the points between two planes, where one plane crosses the other, given a set of bounds. Crossing is not just intersection; the planes cannot touch at just one point on the ellipsoid, but must cross at two.

Parameters:

planetModel - is the planet model.

q - is the plane to intersect with.

bounds - are the bounds to consider to determine legal intersection points.

Returns:

the set of legal crossing points, or null if the planes are numerically identical.

arePointsCoplanar

public static boolean arePointsCoplanar(GeoPoint A,
                                        GeoPoint B,
                                        GeoPoint C)

Checks if three points are coplanar in any of the three planes they can describe. The planes are all assumed to go through the origin.

Parameters:

A - The first point.

B - The second point.

C - The third point

Returns:

true if provided points are coplanar in any of the three planes they can describe.

findIntersections

protected GeoPoint[] findIntersections(PlanetModel planetModel,
                                       Plane q,
                                       Membership[] bounds,
                                       Membership[] moreBounds)

Find the intersection points between two planes, given a set of bounds.

Parameters:

planetModel - is the planet model to use in finding points.

q - is the plane to intersect with.

bounds - is the set of bounds.

moreBounds - is another set of bounds.

Returns:

the intersection point(s) on the unit sphere, if there are any.

findCrossings

protected GeoPoint[] findCrossings(PlanetModel planetModel,
                                   Plane q,
                                   Membership[] bounds,
                                   Membership[] moreBounds)

Find the points between two planes, where one plane crosses the other, given a set of bounds. Crossing is not just intersection; the planes cannot touch at just one point on the ellipsoid, but must cross at two.

Parameters:

planetModel - is the planet model to use in finding points.

q - is the plane to intersect with.

bounds - is the set of bounds.

moreBounds - is another set of bounds.

Returns:

the intersection point(s) on the ellipsoid, if there are any.

findIntersectionBounds

protected void findIntersectionBounds(PlanetModel planetModel,
                                      Bounds boundsInfo,
                                      Plane q,
                                      Membership... bounds)

Record intersection points for planes with error bounds. This method calls the Bounds object with every intersection point it can find that matches the criteria. Each plane is considered to have two sides, one that is D + MINIMUM_RESOLUTION, and one that is D - MINIMUM_RESOLUTION. Both are examined and intersection points determined.

recordBounds

public void recordBounds(PlanetModel planetModel,
                         XYZBounds boundsInfo,
                         Plane p,
                         Membership... bounds)

Accumulate (x,y,z) bounds information for this plane, intersected with another and the world. Updates min/max information using intersection points found. These include the error envelope for the planes (D +/- MINIMUM_RESOLUTION).

Parameters:

planetModel - is the planet model to use in determining bounds.

boundsInfo - is the xyz info to update with additional bounding information.

p - is the other plane.

bounds - are the surfaces delineating what's inside the shape.

recordBounds

public void recordBounds(PlanetModel planetModel,
                         XYZBounds boundsInfo,
                         Membership... bounds)

Accumulate (x,y,z) bounds information for this plane, intersected with the unit sphere. Updates min/max information, using max/min points found within the specified bounds.

Parameters:

planetModel - is the planet model to use in determining bounds.

boundsInfo - is the xyz info to update with additional bounding information.

bounds - are the surfaces delineating what's inside the shape.

recordBounds

public void recordBounds(PlanetModel planetModel,
                         LatLonBounds boundsInfo,
                         Plane p,
                         Membership... bounds)

Accumulate bounds information for this plane, intersected with another plane and the world. Updates both latitude and longitude information, using max/min points found within the specified bounds. Also takes into account the error envelope for all planes being intersected.

Parameters:

planetModel - is the planet model to use in determining bounds.

boundsInfo - is the lat/lon info to update with additional bounding information.

p - is the other plane.

bounds - are the surfaces delineating what's inside the shape.

recordBounds

public void recordBounds(PlanetModel planetModel,
                         LatLonBounds boundsInfo,
                         Membership... bounds)

Accumulate bounds information for this plane, intersected with the unit sphere. Updates both latitude and longitude information, using max/min points found within the specified bounds.

Parameters:

planetModel - is the planet model to use in determining bounds.

boundsInfo - is the lat/lon info to update with additional bounding information.

bounds - are the surfaces delineating what's inside the shape.

intersects

public boolean intersects(PlanetModel planetModel,
                          Plane q,
                          GeoPoint[] notablePoints,
                          GeoPoint[] moreNotablePoints,
                          Membership[] bounds,
                          Membership... moreBounds)

Determine whether the plane intersects another plane within the bounds provided.

Parameters:

planetModel - is the planet model to use in determining intersection.

q - is the other plane.

notablePoints - are points to look at to disambiguate cases when the two planes are identical.

moreNotablePoints - are additional points to look at to disambiguate cases when the two planes are identical.

bounds - is one part of the bounds.

moreBounds - are more bounds.

Returns:

true if there's an intersection.

crosses

public boolean crosses(PlanetModel planetModel,
                       Plane q,
                       GeoPoint[] notablePoints,
                       GeoPoint[] moreNotablePoints,
                       Membership[] bounds,
                       Membership... moreBounds)

Determine whether the plane crosses another plane within the bounds provided. Crossing is defined as intersecting with the geo surface at two points.

Parameters:

planetModel - is the planet model to use in determining intersection.

q - is the other plane.

notablePoints - are points to look at to disambiguate cases when the two planes are identical.

moreNotablePoints - are additional points to look at to disambiguate cases when the two planes are identical.

bounds - is one part of the bounds.

moreBounds - are more bounds.

Returns:

true if there's a crossing.

isFunctionallyIdentical

public boolean isFunctionallyIdentical(Plane p)

Returns true if this plane and the other plane are functionally identical within the margin of error. Functionally identical means that the planes are so close to parallel that many aspects of planar math, like intersections, no longer have answers to within the required precision.

Parameters:

p - is the plane to compare against.

Returns:

true if the planes are functionally identical.

isNumericallyIdentical

public boolean isNumericallyIdentical(Plane p)

Returns true if this plane and the other plane are identical within the margin of error.

Parameters:

p - is the plane to compare against.

Returns:

true if the planes are numerically identical.

findArcDistancePoints

public GeoPoint[] findArcDistancePoints(PlanetModel planetModel,
                                        double arcDistanceValue,
                                        GeoPoint startPoint,
                                        Membership... bounds)

Locate a point that is within the specified bounds and on the specified plane, that has an arcDistance as specified from the startPoint.

Parameters:

planetModel - is the planet model.

arcDistanceValue - is the arc distance.

startPoint - is the starting point.

bounds - are the bounds.

Returns:

zero, one, or two points.

getSampleIntersectionPoint

public GeoPoint getSampleIntersectionPoint(PlanetModel planetModel,
                                           Plane q)

Find a sample point on the intersection between two planes and the world.

Parameters:

planetModel - is the planet model.

q - is the second plane to consider.

Returns:

a sample point that is on the intersection between the two planes and the world.

toString

public String toString()

Overrides:

toString in class Vector

equals

public boolean equals(Object o)

Overrides:

equals in class Vector

hashCode

public int hashCode()

Overrides:

hashCode in class Vector