com.spatial4j.core.distance

Interface DistanceCalculator

All Known Implementing Classes:

AbstractDistanceCalculator, CartesianDistCalc, GeodesicSphereDistCalc, GeodesicSphereDistCalc.Haversine, GeodesicSphereDistCalc.LawOfCosines, GeodesicSphereDistCalc.Vincenty

public interface DistanceCalculator

Performs calculations relating to distance, such as the distance between a pair of points. A calculator might be based on Euclidean space, or a spherical model, or theoretically something else like an ellipsoid.

Method Summary

Methods

Modifier and Type	Method and Description
double	area(Circle circle)
double	area(Rectangle rect)
double	calcBoxByDistFromPt_yHorizAxisDEG(Point from, double distDEG, SpatialContext ctx) The Y coordinate of the horizontal axis of a circle that has maximum width.
Rectangle	calcBoxByDistFromPt(Point from, double distDEG, SpatialContext ctx, Rectangle reuse) Calculates the bounding box of a circle, as specified by its center point and distance.
double	distance(Point from, double toX, double toY) The distance between from and Point(toX,toY).
double	distance(Point from, Point to) The distance between from and to.
Point	pointOnBearing(Point from, double distDEG, double bearingDEG, SpatialContext ctx, Point reuse) Calculates where a destination point is given an origin (from) distance, and bearing (given in degrees -- 0-360).
boolean	within(Point from, double toX, double toY, double distance) Returns true if the distance between from and to is <= distance.

Method Detail

distance

double distance(Point from,
              Point to)

The distance between from and to.

distance

double distance(Point from,
              double toX,
              double toY)

The distance between from and Point(toX,toY).

within

boolean within(Point from,
             double toX,
             double toY,
             double distance)

Returns true if the distance between from and to is <= distance.

pointOnBearing

Point pointOnBearing(Point from,
                   double distDEG,
                   double bearingDEG,
                   SpatialContext ctx,
                   Point reuse)

Calculates where a destination point is given an origin (from) distance, and bearing (given in degrees -- 0-360). If reuse is given, then this method may reset() it and return it.

calcBoxByDistFromPt

Rectangle calcBoxByDistFromPt(Point from,
                            double distDEG,
                            SpatialContext ctx,
                            Rectangle reuse)

Calculates the bounding box of a circle, as specified by its center point and distance.

calcBoxByDistFromPt_yHorizAxisDEG

double calcBoxByDistFromPt_yHorizAxisDEG(Point from,
                                       double distDEG,
                                       SpatialContext ctx)

The Y coordinate of the horizontal axis of a circle that has maximum width. On a 2D plane, this result is always from.getY() but, perhaps surprisingly, on a sphere it is going to be slightly different.

area

double area(Rectangle rect)

area

double area(Circle circle)