org.apache.lucene.spatial3d.geom

Class LinearSquaredDistance

java.lang.Object

org.apache.lucene.spatial3d.geom.LinearSquaredDistance

All Implemented Interfaces:

DistanceStyle

public class LinearSquaredDistance
extends Object
implements DistanceStyle

Linear squared distance computation style.

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

Field Summary

Fields

Modifier and Type	Field and Description
static LinearSquaredDistance	INSTANCE A convenient instance

Fields inherited from interface org.apache.lucene.spatial3d.geom.DistanceStyle

ARC, LINEAR, LINEAR_SQUARED, NORMAL, NORMAL_SQUARED

Constructor Summary

Constructors

Constructor and Description
LinearSquaredDistance() Constructor.

Method Summary

Modifier and Type	Method and Description
double	computeDistance(GeoPoint point1, double x2, double y2, double z2) Compute the distance from a point to another point.
double	computeDistance(GeoPoint point1, GeoPoint point2) Compute the distance from a point to another point.
double	computeDistance(PlanetModel planetModel, Plane plane, double x, double y, double z, Membership... bounds) Compute the distance from a plane to a point.
double	computeDistance(PlanetModel planetModel, Plane plane, GeoPoint point, Membership... bounds) Compute the distance from a plane to a point.
GeoPoint[]	findDistancePoints(PlanetModel planetModel, double distanceValue, GeoPoint startPoint, Plane plane, Membership... bounds) Find a GeoPoint, at a specified distance from a starting point, within the specified bounds.
double	findMaximumArcDistance(PlanetModel planetModel, double distanceValue) Given a distance metric, find the maximum arc distance represented by the distance metric.
double	findMinimumArcDistance(PlanetModel planetModel, double distanceValue) Given a distance metric, find the minimum arc distance represented by that distance metric.
double	fromAggregationForm(double aggregateDistance) Convert an aggregation form distance value back to an actual distance.
double	toAggregationForm(double distance) Convert a distance to a form meant for aggregation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.spatial3d.geom.DistanceStyle

aggregateDistances

Field Detail

INSTANCE

public static final LinearSquaredDistance INSTANCE

A convenient instance

Constructor Detail

LinearSquaredDistance

public LinearSquaredDistance()

Constructor.

Method Detail

computeDistance

public double computeDistance(GeoPoint point1,
                              GeoPoint point2)

Description copied from interface: DistanceStyle

Compute the distance from a point to another point.

Specified by:

computeDistance in interface DistanceStyle

Parameters:

point1 - Starting point

point2 - Final point

Returns:

the distance

computeDistance

public double computeDistance(GeoPoint point1,
                              double x2,
                              double y2,
                              double z2)

Description copied from interface: DistanceStyle

Compute the distance from a point to another point.

Specified by:

computeDistance in interface DistanceStyle

Parameters:

point1 - Starting point

x2 - Final point x

y2 - Final point y

z2 - Final point z

Returns:

the distance

computeDistance

public double computeDistance(PlanetModel planetModel,
                              Plane plane,
                              GeoPoint point,
                              Membership... bounds)

Description copied from interface: DistanceStyle

Compute the distance from a plane to a point.

Specified by:

computeDistance in interface DistanceStyle

Parameters:

planetModel - The planet model

plane - The plane

point - The point

bounds - are the plane bounds

Returns:

the distance

computeDistance

public double computeDistance(PlanetModel planetModel,
                              Plane plane,
                              double x,
                              double y,
                              double z,
                              Membership... bounds)

Description copied from interface: DistanceStyle

Compute the distance from a plane to a point.

Specified by:

computeDistance in interface DistanceStyle

Parameters:

planetModel - The planet model

plane - The plane

x - The point x

y - The point y

z - The point z

bounds - are the plane bounds

Returns:

the distance

toAggregationForm

public double toAggregationForm(double distance)

Description copied from interface: DistanceStyle

Convert a distance to a form meant for aggregation. This is meant to be used in conjunction with aggregateDistances() and fromAggregationForm(). Distances should be converted to aggregation form before aggregation is attempted, and they should be converted back from aggregation form to yield a final result.

Specified by:

toAggregationForm in interface DistanceStyle

Parameters:

distance - is an output of computeDistance().

Returns:

the distance, converted to aggregation form.

fromAggregationForm

public double fromAggregationForm(double aggregateDistance)

Description copied from interface: DistanceStyle

Convert an aggregation form distance value back to an actual distance. This is meant to be used in conjunctiion with toAggregationForm() and aggregateDistances(). Distances should be converted to aggregation form before aggregation is attempted, and they should be converted back from aggregation form to yield a final result.

Specified by:

fromAggregationForm in interface DistanceStyle

Parameters:

aggregateDistance - is the aggregate form of the distance.

Returns:

the combined distance.

findDistancePoints

public GeoPoint[] findDistancePoints(PlanetModel planetModel,
                                     double distanceValue,
                                     GeoPoint startPoint,
                                     Plane plane,
                                     Membership... bounds)

Description copied from interface: DistanceStyle

Find a GeoPoint, at a specified distance from a starting point, within the specified bounds. The GeoPoint must be in the specified plane.

Specified by:

findDistancePoints in interface DistanceStyle

Parameters:

planetModel - is the planet model.

distanceValue - is the distance to set the new point at, measured from point1 and on the way to point2.

startPoint - is the starting point.

plane - is the plane that the point must be in.

bounds - are the constraints on where the point can be found.

Returns:

zero, one, or two points at the proper distance from startPoint.

findMinimumArcDistance

public double findMinimumArcDistance(PlanetModel planetModel,
                                     double distanceValue)

Description copied from interface: DistanceStyle

Given a distance metric, find the minimum arc distance represented by that distance metric.

Specified by:

findMinimumArcDistance in interface DistanceStyle

Parameters:

planetModel - is the planet model.

distanceValue - is the distance metric.

Returns:

the minimum arc distance that that distance value can represent given the planet model.

findMaximumArcDistance

public double findMaximumArcDistance(PlanetModel planetModel,
                                     double distanceValue)

Description copied from interface: DistanceStyle

Given a distance metric, find the maximum arc distance represented by the distance metric.

Specified by:

findMaximumArcDistance in interface DistanceStyle

Parameters:

planetModel - is the planet model.

distanceValue - is the distance metric.

Returns:

the maximum arc distance that that distance value can represent given the planet model.