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package com.mapbox.turf;
import static com.mapbox.turf.TurfConversion.degreesToRadians;
import static com.mapbox.turf.TurfConversion.radiansToDegrees;
import androidx.annotation.FloatRange;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.google.gson.JsonObject;
import com.mapbox.geojson.BoundingBox;
import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
import com.mapbox.geojson.GeoJson;
import com.mapbox.geojson.Geometry;
import com.mapbox.geojson.GeometryCollection;
import com.mapbox.geojson.LineString;
import com.mapbox.geojson.MultiLineString;
import com.mapbox.geojson.MultiPoint;
import com.mapbox.geojson.MultiPolygon;
import com.mapbox.geojson.Point;
import com.mapbox.geojson.Polygon;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Class contains an assortment of methods used to calculate measurements such as bearing,
* destination, midpoint, etc.
*
* @see Turf documentation
* @since 1.2.0
*/
public final class TurfMeasurement {
private TurfMeasurement() {
throw new AssertionError("No Instances.");
}
/**
* Earth's radius in meters.
*/
public static double EARTH_RADIUS = 6378137;
/**
* Takes two {@link Point}s and finds the geographic bearing between them.
*
* @param point1 first point used for calculating the bearing
* @param point2 second point used for calculating the bearing
* @return bearing in decimal degrees
* @see Turf Bearing documentation
* @since 1.3.0
*/
public static double bearing(@NonNull Point point1, @NonNull Point point2) {
double lon1 = degreesToRadians(point1.longitude());
double lon2 = degreesToRadians(point2.longitude());
double lat1 = degreesToRadians(point1.latitude());
double lat2 = degreesToRadians(point2.latitude());
double value1 = Math.sin(lon2 - lon1) * Math.cos(lat2);
double value2 = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
* Math.cos(lat2) * Math.cos(lon2 - lon1);
return radiansToDegrees(Math.atan2(value1, value2));
}
/**
* Takes a Point and calculates the location of a destination point given a distance in
* degrees, radians, miles, or kilometers; and bearing in degrees. This uses the Haversine
* formula to account for global curvature.
*
* @param point starting point used for calculating the destination
* @param distance distance from the starting point
* @param bearing ranging from -180 to 180 in decimal degrees
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return destination {@link Point} result where you specified
* @see Turf Destination documetation
* @since 1.2.0
*/
@NonNull
public static Point destination(@NonNull Point point, @FloatRange(from = 0) double distance,
@FloatRange(from = -180, to = 180) double bearing,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double longitude1 = degreesToRadians(point.longitude());
double latitude1 = degreesToRadians(point.latitude());
double bearingRad = degreesToRadians(bearing);
double radians = TurfConversion.lengthToRadians(distance, units);
double latitude2 = Math.asin(Math.sin(latitude1) * Math.cos(radians)
+ Math.cos(latitude1) * Math.sin(radians) * Math.cos(bearingRad));
double longitude2 = longitude1 + Math.atan2(Math.sin(bearingRad)
* Math.sin(radians) * Math.cos(latitude1),
Math.cos(radians) - Math.sin(latitude1) * Math.sin(latitude2));
return Point.fromLngLat(
radiansToDegrees(longitude2), radiansToDegrees(latitude2));
}
/**
* Calculates the distance between two points in kilometers. This uses the Haversine formula to
* account for global curvature.
*
* @param point1 first point used for calculating the bearing
* @param point2 second point used for calculating the bearing
* @return distance between the two points in kilometers
* @see Turf distance documentation
* @since 1.2.0
*/
public static double distance(@NonNull Point point1, @NonNull Point point2) {
return distance(point1, point2, TurfConstants.UNIT_DEFAULT);
}
/**
* Calculates the distance between two points in degress, radians, miles, or kilometers. This
* uses the Haversine formula to account for global curvature.
*
* @param point1 first point used for calculating the bearing
* @param point2 second point used for calculating the bearing
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return distance between the two points in kilometers
* @see Turf distance documentation
* @since 1.2.0
*/
public static double distance(@NonNull Point point1, @NonNull Point point2,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double difLat = degreesToRadians((point2.latitude() - point1.latitude()));
double difLon = degreesToRadians((point2.longitude() - point1.longitude()));
double lat1 = degreesToRadians(point1.latitude());
double lat2 = degreesToRadians(point2.latitude());
double value = Math.pow(Math.sin(difLat / 2), 2)
+ Math.pow(Math.sin(difLon / 2), 2) * Math.cos(lat1) * Math.cos(lat2);
return TurfConversion.radiansToLength(
2 * Math.atan2(Math.sqrt(value), Math.sqrt(1 - value)), units);
}
/**
* Takes a {@link LineString} and measures its length in the specified units.
*
* @param lineString geometry to measure
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return length of the input line in the units specified
* @see Turf Line Distance documentation
* @since 1.2.0
*/
public static double length(@NonNull LineString lineString,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
List coordinates = lineString.coordinates();
return length(coordinates, units);
}
/**
* Takes a {@link MultiLineString} and measures its length in the specified units.
*
* @param multiLineString geometry to measure
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return length of the input lines combined, in the units specified
* @see Turf Line Distance documentation
* @since 1.2.0
*/
public static double length(@NonNull MultiLineString multiLineString,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double len = 0;
for (List points : multiLineString.coordinates()) {
len += length(points, units);
}
return len;
}
/**
* Takes a {@link Polygon} and measures its perimeter in the specified units. if the polygon
* contains holes, the perimeter will also be included.
*
* @param polygon geometry to measure
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return total perimeter of the input polygon in the units specified
* @see Turf Line Distance documentation
* @since 1.2.0
*/
public static double length(@NonNull Polygon polygon,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double len = 0;
for (List points : polygon.coordinates()) {
len += length(points, units);
}
return len;
}
/**
* Takes a {@link MultiPolygon} and measures each polygons perimeter in the specified units. if
* one of the polygons contains holes, the perimeter will also be included.
*
* @param multiPolygon geometry to measure
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return total perimeter of the input polygons combined, in the units specified
* @see Turf Line Distance documentation
* @since 1.2.0
*/
public static double length(@NonNull MultiPolygon multiPolygon,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double len = 0;
List>> coordinates = multiPolygon.coordinates();
for (List> coordinate : coordinates) {
for (List theCoordinate : coordinate) {
len += length(theCoordinate, units);
}
}
return len;
}
/**
* Takes a {@link List} of {@link Point} and measures its length in the specified units.
*
* @param coords geometry to measure
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return length of the input line in the units specified
* @see Turf Line Distance documentation
* @since 5.2.0
*/
public static double length(List coords, String units) {
double travelled = 0;
Point prevCoords = coords.get(0);
Point curCoords;
for (int i = 1; i < coords.size(); i++) {
curCoords = coords.get(i);
travelled += distance(prevCoords, curCoords, units);
prevCoords = curCoords;
}
return travelled;
}
/**
* Takes two {@link Point}s and returns a point midway between them. The midpoint is calculated
* geodesically, meaning the curvature of the earth is taken into account.
*
* @param from first point used for calculating the midpoint
* @param to second point used for calculating the midpoint
* @return a {@link Point} midway between point1 and point2
* @see Turf Midpoint documentation
* @since 1.3.0
*/
public static Point midpoint(@NonNull Point from, @NonNull Point to) {
double dist = distance(from, to, TurfConstants.UNIT_MILES);
double heading = bearing(from, to);
return destination(from, dist / 2, heading, TurfConstants.UNIT_MILES);
}
/**
* Takes a line and returns a point at a specified distance along the line.
*
* @param line that the point should be placed upon
* @param distance along the linestring geometry which the point should be placed on
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return a {@link Point} which is on the linestring provided and at the distance from
* the origin of that line to the end of the distance
* @since 1.3.0
*/
public static Point along(@NonNull LineString line, @FloatRange(from = 0) double distance,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
return along(line.coordinates(), distance, units);
}
/**
* Takes a list of points and returns a point at a specified distance along the line.
*
* @param coords that the point should be placed upon
* @param distance along the linestring geometry which the point should be placed on
* @param units one of the units found inside {@link TurfConstants.TurfUnitCriteria}
* @return a {@link Point} which is on the linestring provided and at the distance from
* the origin of that line to the end of the distance
* @since 5.2.0
*/
public static Point along(@NonNull List coords, @FloatRange(from = 0) double distance,
@NonNull @TurfConstants.TurfUnitCriteria String units) {
double travelled = 0;
for (int i = 0; i < coords.size(); i++) {
if (distance >= travelled && i == coords.size() - 1) {
break;
} else if (travelled >= distance) {
double overshot = distance - travelled;
if (overshot == 0) {
return coords.get(i);
} else {
double direction = bearing(coords.get(i), coords.get(i - 1)) - 180;
return destination(coords.get(i), overshot, direction, units);
}
} else {
travelled += distance(coords.get(i), coords.get(i + 1), units);
}
}
return coords.get(coords.size() - 1);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param point a {@link Point} object
* @return A double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(@NonNull Point point) {
List resultCoords = TurfMeta.coordAll(point);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param lineString a {@link LineString} object
* @return A double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(@NonNull LineString lineString) {
List resultCoords = TurfMeta.coordAll(lineString);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param multiPoint a {@link MultiPoint} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(@NonNull MultiPoint multiPoint) {
List resultCoords = TurfMeta.coordAll(multiPoint);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param polygon a {@link Polygon} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(@NonNull Polygon polygon) {
List resultCoords = TurfMeta.coordAll(polygon, false);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param multiLineString a {@link MultiLineString} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(@NonNull MultiLineString multiLineString) {
List resultCoords = TurfMeta.coordAll(multiLineString);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param multiPolygon a {@link MultiPolygon} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(MultiPolygon multiPolygon) {
List resultCoords = TurfMeta.coordAll(multiPolygon, false);
return bboxCalculator(resultCoords);
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param geoJson a {@link GeoJson} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 4.8.0
*/
public static double[] bbox(GeoJson geoJson) {
BoundingBox boundingBox = geoJson.bbox();
if (boundingBox != null) {
return new double[] {
boundingBox.west(),
boundingBox.south(),
boundingBox.east(),
boundingBox.north()
};
}
if (geoJson instanceof Geometry) {
return bbox((Geometry) geoJson);
} else if (geoJson instanceof FeatureCollection) {
return bbox((FeatureCollection) geoJson);
} else if (geoJson instanceof Feature) {
return bbox((Feature) geoJson);
} else {
throw new UnsupportedOperationException("bbox type not supported for GeoJson instance");
}
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param featureCollection a {@link FeatureCollection} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 4.8.0
*/
public static double[] bbox(FeatureCollection featureCollection) {
return bboxCalculator(TurfMeta.coordAll(featureCollection, false));
}
/**
* Takes a set of features, calculates the bbox of all input features, and returns a bounding box.
*
* @param feature a {@link Feature} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 4.8.0
*/
public static double[] bbox(Feature feature) {
return bboxCalculator(TurfMeta.coordAll(feature, false));
}
/**
* Takes an arbitrary {@link Geometry} and calculates a bounding box.
*
* @param geometry a {@link Geometry} object
* @return a double array defining the bounding box in this order {@code [minX, minY, maxX, maxY]}
* @since 2.0.0
*/
public static double[] bbox(Geometry geometry) {
if (geometry instanceof Point) {
return bbox((Point) geometry);
} else if (geometry instanceof MultiPoint) {
return bbox((MultiPoint) geometry);
} else if (geometry instanceof LineString) {
return bbox((LineString) geometry);
} else if (geometry instanceof MultiLineString) {
return bbox((MultiLineString) geometry);
} else if (geometry instanceof Polygon) {
return bbox((Polygon) geometry);
} else if (geometry instanceof MultiPolygon) {
return bbox((MultiPolygon) geometry);
} else if (geometry instanceof GeometryCollection) {
List points = new ArrayList<>();
for (Geometry geo : ((GeometryCollection) geometry).geometries()) {
// recursive
double[] bbox = bbox(geo);
points.add(Point.fromLngLat(bbox[0], bbox[1]));
points.add(Point.fromLngLat(bbox[2], bbox[1]));
points.add(Point.fromLngLat(bbox[2], bbox[3]));
points.add(Point.fromLngLat(bbox[0], bbox[3]));
}
return TurfMeasurement.bbox(MultiPoint.fromLngLats(points));
} else {
throw new RuntimeException(("Unknown geometry class: " + geometry.getClass()));
}
}
private static double[] bboxCalculator(List resultCoords) {
double[] bbox = new double[4];
bbox[0] = Double.POSITIVE_INFINITY;
bbox[1] = Double.POSITIVE_INFINITY;
bbox[2] = Double.NEGATIVE_INFINITY;
bbox[3] = Double.NEGATIVE_INFINITY;
for (Point point : resultCoords) {
if (bbox[0] > point.longitude()) {
bbox[0] = point.longitude();
}
if (bbox[1] > point.latitude()) {
bbox[1] = point.latitude();
}
if (bbox[2] < point.longitude()) {
bbox[2] = point.longitude();
}
if (bbox[3] < point.latitude()) {
bbox[3] = point.latitude();
}
}
return bbox;
}
/**
* Takes a {@link BoundingBox} and uses its coordinates to create a {@link Polygon}
* geometry.
*
* @param boundingBox a {@link BoundingBox} object to calculate with
* @return a {@link Feature} object
* @see Turf BoundingBox Polygon documentation
* @since 4.9.0
*/
public static Feature bboxPolygon(@NonNull BoundingBox boundingBox) {
return bboxPolygon(boundingBox, null, null);
}
/**
* Takes a {@link BoundingBox} and uses its coordinates to create a {@link Polygon}
* geometry.
*
* @param boundingBox a {@link BoundingBox} object to calculate with
* @param properties a {@link JsonObject} containing the feature properties
* @param id common identifier of this feature
* @return a {@link Feature} object
* @see Turf BoundingBox Polygon documentation
* @since 4.9.0
*/
public static Feature bboxPolygon(@NonNull BoundingBox boundingBox,
@Nullable JsonObject properties,
@Nullable String id) {
return Feature.fromGeometry(Polygon.fromLngLats(
Collections.singletonList(
Arrays.asList(
Point.fromLngLat(boundingBox.west(), boundingBox.south()),
Point.fromLngLat(boundingBox.east(), boundingBox.south()),
Point.fromLngLat(boundingBox.east(), boundingBox.north()),
Point.fromLngLat(boundingBox.west(), boundingBox.north()),
Point.fromLngLat(boundingBox.west(), boundingBox.south())))), properties, id);
}
/**
* Takes a bbox and uses its coordinates to create a {@link Polygon} geometry.
*
* @param bbox a double[] object to calculate with
* @return a {@link Feature} object
* @see Turf BoundingBox Polygon documentation
* @since 4.9.0
*/
public static Feature bboxPolygon(@NonNull double[] bbox) {
return bboxPolygon(bbox, null, null);
}
/**
* Takes a bbox and uses its coordinates to create a {@link Polygon} geometry.
*
* @param bbox a double[] object to calculate with
* @param properties a {@link JsonObject} containing the feature properties
* @param id common identifier of this feature
* @return a {@link Feature} object
* @see Turf BoundingBox Polygon documentation
* @since 4.9.0
*/
public static Feature bboxPolygon(@NonNull double[] bbox,
@Nullable JsonObject properties,
@Nullable String id) {
return Feature.fromGeometry(Polygon.fromLngLats(
Collections.singletonList(
Arrays.asList(
Point.fromLngLat(bbox[0], bbox[1]),
Point.fromLngLat(bbox[2], bbox[1]),
Point.fromLngLat(bbox[2], bbox[3]),
Point.fromLngLat(bbox[0], bbox[3]),
Point.fromLngLat(bbox[0], bbox[1])))), properties, id);
}
/**
* Takes any number of features and returns a rectangular Polygon that encompasses all vertices.
*
* @param geoJson input features
* @return a rectangular Polygon feature that encompasses all vertices
* @since 4.9.0
*/
public static Polygon envelope(GeoJson geoJson) {
return (Polygon) bboxPolygon(bbox(geoJson)).geometry();
}
/**
* Takes a bounding box and calculates the minimum square bounding box
* that would contain the input.
*
* @param boundingBox extent in west, south, east, north order
* @return a square surrounding bbox
* @since 4.9.0
*/
public static BoundingBox square(@NonNull BoundingBox boundingBox) {
double horizontalDistance = distance(boundingBox.southwest(),
Point.fromLngLat(boundingBox.east(), boundingBox.south())
);
double verticalDistance = distance(
Point.fromLngLat(boundingBox.west(), boundingBox.south()),
Point.fromLngLat(boundingBox.west(), boundingBox.north())
);
if (horizontalDistance >= verticalDistance) {
double verticalMidpoint = (boundingBox.south() + boundingBox.north()) / 2;
return BoundingBox.fromLngLats(
boundingBox.west(),
verticalMidpoint - ((boundingBox.east() - boundingBox.west()) / 2),
boundingBox.east(),
verticalMidpoint + ((boundingBox.east() - boundingBox.west()) / 2)
);
} else {
double horizontalMidpoint = (boundingBox.west() + boundingBox.east()) / 2;
return BoundingBox.fromLngLats(
horizontalMidpoint - ((boundingBox.north() - boundingBox.south()) / 2),
boundingBox.south(),
horizontalMidpoint + ((boundingBox.north() - boundingBox.south()) / 2),
boundingBox.north()
);
}
}
/**
* Takes one {@link Feature} and returns it's area in square meters.
*
* @param feature input {@link Feature}
* @return area in square meters
* @since 4.10.0
*/
public static double area(@NonNull Feature feature) {
return feature.geometry() != null ? area(feature.geometry()) : 0.0f;
}
/**
* Takes one {@link FeatureCollection} and returns it's area in square meters.
*
* @param featureCollection input {@link FeatureCollection}
* @return area in square meters
* @since 4.10.0
*/
public static double area(@NonNull FeatureCollection featureCollection) {
List features = featureCollection.features();
double total = 0.0f;
if (features != null) {
for (Feature feature : features) {
total += area(feature);
}
}
return total;
}
/**
* Takes one {@link Geometry} and returns its area in square meters.
*
* @param geometry input {@link Geometry}
* @return area in square meters
* @since 4.10.0
*/
public static double area(@NonNull Geometry geometry) {
return calculateArea(geometry);
}
private static double calculateArea(@NonNull Geometry geometry) {
double total = 0.0f;
if (geometry instanceof Polygon) {
return polygonArea(((Polygon) geometry).coordinates());
} else if (geometry instanceof MultiPolygon) {
List>> coordinates = ((MultiPolygon) geometry).coordinates();
for (int i = 0; i < coordinates.size(); i++) {
total += polygonArea(coordinates.get(i));
}
return total;
} else {
// Area should be 0 for case Point, MultiPoint, LineString and MultiLineString
return 0.0f;
}
}
private static double polygonArea(@NonNull List> coordinates) {
double total = 0.0f;
if (coordinates.size() > 0) {
total += Math.abs(ringArea(coordinates.get(0)));
for (int i = 1; i < coordinates.size(); i++) {
total -= Math.abs(ringArea(coordinates.get(i)));
}
}
return total;
}
/**
* Calculate the approximate area of the polygon were it projected onto the earth.
* Note that this area will be positive if ring is oriented clockwise, otherwise
* it will be negative.
*
* Reference:
* Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for Polygons on a Sphere",
* JPL Publication 07-03, Jet Propulsion
* Laboratory, Pasadena, CA, June 2007 https://trs.jpl.nasa.gov/handle/2014/41271
*
* @param coordinates A list of {@link Point} of Ring Coordinates
* @return The approximate signed geodesic area of the polygon in square meters.
*/
private static double ringArea(@NonNull List coordinates) {
Point p1;
Point p2;
Point p3;
int lowerIndex;
int middleIndex;
int upperIndex;
double total = 0.0f;
final int coordsLength = coordinates.size();
if (coordsLength > 2) {
for (int i = 0; i < coordsLength; i++) {
if (i == coordsLength - 2) { // i = N-2
lowerIndex = coordsLength - 2;
middleIndex = coordsLength - 1;
upperIndex = 0;
} else if (i == coordsLength - 1) { // i = N-1
lowerIndex = coordsLength - 1;
middleIndex = 0;
upperIndex = 1;
} else { // i = 0 to N-3
lowerIndex = i;
middleIndex = i + 1;
upperIndex = i + 2;
}
p1 = coordinates.get(lowerIndex);
p2 = coordinates.get(middleIndex);
p3 = coordinates.get(upperIndex);
total += (rad(p3.longitude()) - rad(p1.longitude())) * Math.sin(rad(p2.latitude()));
}
total = total * EARTH_RADIUS * EARTH_RADIUS / 2;
}
return total;
}
private static double rad(double num) {
return num * Math.PI / 180;
}
/**
* Takes a {@link Feature} and returns the absolute center of the {@link Feature}.
*
* @param feature the single {@link Feature} to find the center of.
* @param properties a optional {@link JsonObject} containing the properties that should be
* placed in the returned {@link Feature}.
* @param id an optional common identifier that should be placed in the returned {@link Feature}.
* @return a {@link Feature} with a {@link Point} geometry type.
* @since 5.3.0
*/
public static Feature center(Feature feature,
@Nullable JsonObject properties,
@Nullable String id) {
return center(FeatureCollection.fromFeature(feature), properties, id);
}
/**
* Takes a {@link Feature} and returns the absolute center of the {@link Feature}.
*
* @param feature the single {@link Feature} to find the center of.
* @return a {@link Feature} with a {@link Point} geometry type.
* @since 5.3.0
*/
public static Feature center(Feature feature) {
return center(FeatureCollection.fromFeature(feature), null, null);
}
/**
* Takes {@link FeatureCollection} and returns the absolute center
* of the {@link Feature}s in the {@link FeatureCollection}.
*
* @param featureCollection the single {@link FeatureCollection} to find the center of.
* @param properties a optional {@link JsonObject} containing the properties that should be
* placed in the returned {@link Feature}.
* @param id an optional common identifier that should be placed in the returned {@link Feature}.
* @return a {@link Feature} with a {@link Point} geometry type.
* @since 5.3.0
*/
public static Feature center(FeatureCollection featureCollection,
@Nullable JsonObject properties,
@Nullable String id) {
double[] ext = bbox(featureCollection);
double finalCenterLongitude = (ext[0] + ext[2]) / 2;
double finalCenterLatitude = (ext[1] + ext[3]) / 2;
return Feature.fromGeometry(Point.fromLngLat(finalCenterLongitude, finalCenterLatitude),
properties, id);
}
/**
* Takes {@link FeatureCollection} and returns the absolute center
* of the {@link Feature}s in the {@link FeatureCollection}.
*
* @param featureCollection the single {@link FeatureCollection} to find the center of.
* @return a {@link Feature} with a {@link Point} geometry type.
* @since 5.3.0
*/
public static Feature center(FeatureCollection featureCollection) {
return center(featureCollection, null, null);
}
}
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