ai.nextbillion.kits.geojson.utils

Class PolylineUtils

java.lang.Object

ai.nextbillion.kits.geojson.utils.PolylineUtils

public final class PolylineUtils
extends java.lang.Object

Polyline utils class contains method that can decode/encode a polyline, simplify a line, and more.

Method Summary

Modifier and Type	Method and Description
static java.util.List<Point>	decode(java.lang.String encodedPath, int precision) Decodes an encoded path string into a sequence of Point.
static java.lang.String	encode(java.util.List<Point> path, int precision) Encodes a sequence of Points into an encoded path string.
static java.util.List<Point>	simplify(java.util.List<Point> points) Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.
static java.util.List<Point>	simplify(java.util.List<Point> points, boolean highestQuality) Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.
static java.util.List<Point>	simplify(java.util.List<Point> points, double tolerance) Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.
static java.util.List<Point>	simplify(java.util.List<Point> points, double tolerance, boolean highestQuality) Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.

Methods inherited from class java.lang.Object

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

Method Detail

decode

@NonNull
public static java.util.List<Point> decode(@NonNull
                                                    java.lang.String encodedPath,
                                                    int precision)

Decodes an encoded path string into a sequence of Point.

Parameters:

encodedPath - a String representing an encoded path string

precision - OSRMv4 uses 6, OSRMv5 and Google uses 5

Returns:

list of Point making up the line

encode

@NonNull
public static java.lang.String encode(@NonNull
                                               java.util.List<Point> path,
                                               int precision)

Encodes a sequence of Points into an encoded path string.

Parameters:

path - list of Points making up the line

precision - OSRMv4 uses 6, OSRMv5 and Google uses 5

Returns:

a String representing a path string

simplify

@NonNull
public static java.util.List<Point> simplify(@NonNull
                                                      java.util.List<Point> points)

Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.

Parameters:

points - an array of points

Returns:

an array of simplified points

See Also:

JavaScript implementation

simplify

@NonNull
public static java.util.List<Point> simplify(@NonNull
                                                      java.util.List<Point> points,
                                                      double tolerance)

Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.

Parameters:

points - an array of points

tolerance - affects the amount of simplification (in the same metric as the point coordinates)

Returns:

an array of simplified points

See Also:

JavaScript implementation

simplify

@NonNull
public static java.util.List<Point> simplify(@NonNull
                                                      java.util.List<Point> points,
                                                      boolean highestQuality)

Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.

Parameters:

points - an array of points

highestQuality - excludes distance-based preprocessing step which leads to highest quality simplification

Returns:

an array of simplified points

See Also:

JavaScript implementation

simplify

@NonNull
public static java.util.List<Point> simplify(@NonNull
                                                      java.util.List<Point> points,
                                                      double tolerance,
                                                      boolean highestQuality)

Reduces the number of points in a polyline while retaining its shape, giving a performance boost when processing it and also reducing visual noise.

Parameters:

points - an array of points

tolerance - affects the amount of simplification (in the same metric as the point coordinates)

highestQuality - excludes distance-based preprocessing step which leads to highest quality simplification

Returns:

an array of simplified points

See Also:

JavaScript implementation