Replace ol/Sphere with ol/sphere
This commit is contained in:
Tim Schaub
+1
-10
@@ -4,14 +4,12 @@
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import {inherits} from './index.js';
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import _ol_GeolocationProperty_ from './GeolocationProperty.js';
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import _ol_Object_ from './Object.js';
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import _ol_Sphere_ from './Sphere.js';
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import _ol_events_ from './events.js';
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import EventType from './events/EventType.js';
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import Polygon from './geom/Polygon.js';
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import _ol_has_ from './has.js';
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import {toRadians} from './math.js';
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import {get as getProjection, getTransformFromProjections, identityTransform} from './proj.js';
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import _ol_proj_EPSG4326_ from './proj/EPSG4326.js';
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/**
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@@ -74,12 +72,6 @@ var Geolocation = function(opt_options) {
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*/
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this.transform_ = identityTransform;
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/**
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* @private
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* @type {ol.Sphere}
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*/
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this.sphere_ = new _ol_Sphere_(_ol_proj_EPSG4326_.RADIUS);
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/**
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* @private
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* @type {number|undefined}
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@@ -175,8 +167,7 @@ Geolocation.prototype.positionChange_ = function(position) {
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this.set(_ol_GeolocationProperty_.POSITION, projectedPosition);
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this.set(_ol_GeolocationProperty_.SPEED,
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coords.speed === null ? undefined : coords.speed);
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var geometry = Polygon.circular(
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this.sphere_, this.position_, coords.accuracy);
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var geometry = Polygon.circular(this.position_, coords.accuracy);
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geometry.applyTransform(this.transform_);
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this.set(_ol_GeolocationProperty_.ACCURACY_GEOMETRY, geometry);
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this.changed();
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@@ -9,6 +9,7 @@ import GeometryType from '../geom/GeometryType.js';
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import LinearRing from '../geom/LinearRing.js';
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import Point from '../geom/Point.js';
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import SimpleGeometry from '../geom/SimpleGeometry.js';
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import {offset as sphereOffset} from '../sphere.js';
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import _ol_geom_flat_area_ from '../geom/flat/area.js';
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import _ol_geom_flat_closest_ from '../geom/flat/closest.js';
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import _ol_geom_flat_contains_ from '../geom/flat/contains.js';
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@@ -369,22 +370,23 @@ Polygon.prototype.setFlatCoordinates = function(layout, flatCoordinates, ends) {
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/**
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* Create an approximation of a circle on the surface of a sphere.
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* @param {ol.Sphere} sphere The sphere.
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* @param {ol.Coordinate} center Center (`[lon, lat]` in degrees).
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* @param {number} radius The great-circle distance from the center to
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* the polygon vertices.
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* @param {number=} opt_n Optional number of vertices for the resulting
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* polygon. Default is `32`.
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* @param {number=} opt_sphereRadius Optional radius for the sphere (defaults to
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* the Earth's mean radius using the WGS84 ellipsoid).
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* @return {ol.geom.Polygon} The "circular" polygon.
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* @api
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*/
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Polygon.circular = function(sphere, center, radius, opt_n) {
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Polygon.circular = function(center, radius, opt_n, opt_sphereRadius) {
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var n = opt_n ? opt_n : 32;
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/** @type {Array.<number>} */
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var flatCoordinates = [];
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var i;
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for (i = 0; i < n; ++i) {
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extend(flatCoordinates, sphere.offset(center, radius, 2 * Math.PI * i / n));
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extend(flatCoordinates, sphereOffset(center, radius, 2 * Math.PI * i / n, opt_sphereRadius));
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}
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flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);
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var polygon = new Polygon(null);
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+3
-12
@@ -1,7 +1,7 @@
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/**
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* @module ol/proj
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*/
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import Sphere from './Sphere.js';
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import {getDistance} from './sphere.js';
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import {applyTransform} from './extent.js';
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import {modulo} from './math.js';
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import EPSG3857 from './proj/EPSG3857.js';
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@@ -21,13 +21,6 @@ import {add as addTransformFunc, clear as clearTransformFuncs, get as getTransfo
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export var METERS_PER_UNIT = Units.METERS_PER_UNIT;
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/**
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* A place to store the mean radius of the Earth.
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* @type {ol.Sphere}
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*/
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var SPHERE = new Sphere(Sphere.DEFAULT_RADIUS);
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/**
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* @param {Array.<number>} input Input coordinate array.
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* @param {Array.<number>=} opt_output Output array of coordinate values.
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@@ -150,10 +143,8 @@ export function getPointResolution(projection, resolution, point, opt_units) {
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point[0], point[1] + resolution / 2
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];
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vertices = toEPSG4326(vertices, vertices, 2);
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var width = SPHERE.haversineDistance(
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vertices.slice(0, 2), vertices.slice(2, 4));
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var height = SPHERE.haversineDistance(
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vertices.slice(4, 6), vertices.slice(6, 8));
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var width = getDistance(vertices.slice(0, 2), vertices.slice(2, 4));
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var height = getDistance(vertices.slice(4, 6), vertices.slice(6, 8));
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pointResolution = (width + height) / 2;
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var metersPerUnit = opt_units ?
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Units.METERS_PER_UNIT[opt_units] :
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+148
-197
@@ -1,113 +1,69 @@
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/**
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* @module ol/Sphere
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*/
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* @license
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* Latitude/longitude spherical geodesy formulae taken from
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* http://www.movable-type.co.uk/scripts/latlong.html
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* Licensed under CC-BY-3.0.
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*/
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/**
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* @license
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* Latitude/longitude spherical geodesy formulae taken from
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* http://www.movable-type.co.uk/scripts/latlong.html
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* Licensed under CC-BY-3.0.
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* @module ol/Sphere
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*/
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import {toRadians, toDegrees} from './math.js';
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import GeometryType from './geom/GeometryType.js';
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/**
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* Object literal with options for the {@link ol.Sphere.getLength} or
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* {@link ol.Sphere.getArea} functions.
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* Object literal with options for the {@link getLength} or
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* {@link getArea} functions.
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* @typedef {{projection: (ol.ProjectionLike|undefined),
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* radius: (number|undefined)}}
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*/
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export var SphereMetricOptions;
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/**
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* @classdesc
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* Class to create objects that can be used with {@link
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* ol.geom.Polygon.circular}.
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*
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* For example to create a sphere whose radius is equal to the semi-major
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* axis of the WGS84 ellipsoid:
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*
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* ```js
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* var wgs84Sphere= new ol.Sphere(6378137);
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* ```
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*
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* @constructor
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* @param {number} radius Radius.
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* @api
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*/
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var _ol_Sphere_ = function(radius) {
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/**
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* @type {number}
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*/
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this.radius = radius;
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};
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/**
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* Returns the geodesic area for a list of coordinates.
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*
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* [Reference](https://trs-new.jpl.nasa.gov/handle/2014/40409)
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* Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
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* Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
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* Laboratory, Pasadena, CA, June 2007
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*
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* @param {Array.<ol.Coordinate>} coordinates List of coordinates of a linear
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* ring. If the ring is oriented clockwise, the area will be positive,
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* otherwise it will be negative.
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* @return {number} Area.
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* @api
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*/
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_ol_Sphere_.prototype.geodesicArea = function(coordinates) {
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return _ol_Sphere_.getArea_(coordinates, this.radius);
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};
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/**
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* Returns the distance from c1 to c2 using the haversine formula.
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*
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* @param {ol.Coordinate} c1 Coordinate 1.
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* @param {ol.Coordinate} c2 Coordinate 2.
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* @return {number} Haversine distance.
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* @api
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*/
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_ol_Sphere_.prototype.haversineDistance = function(c1, c2) {
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return _ol_Sphere_.getDistance_(c1, c2, this.radius);
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};
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/**
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* Returns the coordinate at the given distance and bearing from `c1`.
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*
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* @param {ol.Coordinate} c1 The origin point (`[lon, lat]` in degrees).
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* @param {number} distance The great-circle distance between the origin
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* point and the target point.
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* @param {number} bearing The bearing (in radians).
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* @return {ol.Coordinate} The target point.
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*/
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_ol_Sphere_.prototype.offset = function(c1, distance, bearing) {
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var lat1 = toRadians(c1[1]);
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var lon1 = toRadians(c1[0]);
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var dByR = distance / this.radius;
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var lat = Math.asin(
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Math.sin(lat1) * Math.cos(dByR) +
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Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
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var lon = lon1 + Math.atan2(
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Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
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Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
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return [toDegrees(lon), toDegrees(lat)];
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};
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/**
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* The mean Earth radius (1/3 * (2a + b)) for the WGS84 ellipsoid.
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* https://en.wikipedia.org/wiki/Earth_radius#Mean_radius
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* @type {number}
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*/
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_ol_Sphere_.DEFAULT_RADIUS = 6371008.8;
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export var DEFAULT_RADIUS = 6371008.8;
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/**
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* Get the great circle distance (in meters) between two geographic coordinates.
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* @param {Array} c1 Starting coordinate.
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* @param {Array} c2 Ending coordinate.
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* @param {number=} opt_radius The sphere radius to use. Defaults to the Earth's
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* mean radius using the WGS84 ellipsoid.
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* @return {number} The great circle distance between the points (in meters).
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* @api
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*/
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export function getDistance(c1, c2, opt_radius) {
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var radius = opt_radius || DEFAULT_RADIUS;
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var lat1 = toRadians(c1[1]);
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var lat2 = toRadians(c2[1]);
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var deltaLatBy2 = (lat2 - lat1) / 2;
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var deltaLonBy2 = toRadians(c2[0] - c1[0]) / 2;
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var a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +
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Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *
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Math.cos(lat1) * Math.cos(lat2);
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return 2 * radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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}
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/**
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* Get the cumulative great circle length of linestring coordinates (geographic).
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* @param {Array} coordinates Linestring coordinates.
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* @param {number} radius The sphere radius to use.
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* @return {number} The length (in meters).
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*/
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function getLengthInternal(coordinates, radius) {
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var length = 0;
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for (var i = 0, ii = coordinates.length; i < ii - 1; ++i) {
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length += getDistance(coordinates[i], coordinates[i + 1], radius);
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}
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return length;
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}
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/**
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@@ -122,17 +78,19 @@ _ol_Sphere_.DEFAULT_RADIUS = 6371008.8;
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* @param {(ol.ProjectionLike|undefined)} opt_options.projection Projection of
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* the geometry. By default, the geometry is assumed to be in EPSG:3857
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* (Web Mercator).
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* @param {(number|undefined)} opt_options.radius Sphere radius. By default,
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* the radius of the earth is used (Clarke 1866 Authalic Sphere).
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* @param {(number|undefined)} opt_options.radius Sphere radius. Defaults to
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* the Earth's mean radius using the WGS84 ellipsoid.
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* @return {number} The spherical length (in meters).
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* @api
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*/
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_ol_Sphere_.getLength = function(geometry, opt_options) {
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export function getLength(geometry, opt_options) {
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var options = opt_options || {};
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var radius = options.radius || _ol_Sphere_.DEFAULT_RADIUS;
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var radius = options.radius || DEFAULT_RADIUS;
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var projection = options.projection || 'EPSG:3857';
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geometry = geometry.clone().transform(projection, 'EPSG:4326');
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var type = geometry.getType();
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if (type !== GeometryType.GEOMETRY_COLLECTION) {
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geometry = geometry.clone().transform(projection, 'EPSG:4326');
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}
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var length = 0;
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var coordinates, coords, i, ii, j, jj;
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switch (type) {
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@@ -143,14 +101,14 @@ _ol_Sphere_.getLength = function(geometry, opt_options) {
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case GeometryType.LINE_STRING:
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case GeometryType.LINEAR_RING: {
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coordinates = /** @type {ol.geom.SimpleGeometry} */ (geometry).getCoordinates();
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length = _ol_Sphere_.getLength_(coordinates, radius);
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length = getLengthInternal(coordinates, radius);
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break;
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}
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case GeometryType.MULTI_LINE_STRING:
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case GeometryType.POLYGON: {
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coordinates = /** @type {ol.geom.SimpleGeometry} */ (geometry).getCoordinates();
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for (i = 0, ii = coordinates.length; i < ii; ++i) {
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length += _ol_Sphere_.getLength_(coordinates[i], radius);
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length += getLengthInternal(coordinates[i], radius);
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}
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break;
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}
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@@ -159,7 +117,7 @@ _ol_Sphere_.getLength = function(geometry, opt_options) {
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for (i = 0, ii = coordinates.length; i < ii; ++i) {
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coords = coordinates[i];
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for (j = 0, jj = coords.length; j < jj; ++j) {
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length += _ol_Sphere_.getLength_(coords[j], radius);
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length += getLengthInternal(coords[j], radius);
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}
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}
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break;
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@@ -167,7 +125,7 @@ _ol_Sphere_.getLength = function(geometry, opt_options) {
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case GeometryType.GEOMETRY_COLLECTION: {
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var geometries = /** @type {ol.geom.GeometryCollection} */ (geometry).getGeometries();
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for (i = 0, ii = geometries.length; i < ii; ++i) {
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length += _ol_Sphere_.getLength(geometries[i], opt_options);
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length += getLength(geometries[i], opt_options);
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}
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break;
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}
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@@ -176,101 +134,7 @@ _ol_Sphere_.getLength = function(geometry, opt_options) {
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}
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}
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return length;
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};
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/**
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* Get the cumulative great circle length of linestring coordinates (geographic).
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* @param {Array} coordinates Linestring coordinates.
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* @param {number} radius The sphere radius to use.
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* @return {number} The length (in meters).
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*/
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_ol_Sphere_.getLength_ = function(coordinates, radius) {
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var length = 0;
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for (var i = 0, ii = coordinates.length; i < ii - 1; ++i) {
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length += _ol_Sphere_.getDistance_(coordinates[i], coordinates[i + 1], radius);
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}
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return length;
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};
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/**
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* Get the great circle distance between two geographic coordinates.
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* @param {Array} c1 Starting coordinate.
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* @param {Array} c2 Ending coordinate.
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* @param {number} radius The sphere radius to use.
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* @return {number} The great circle distance between the points (in meters).
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*/
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_ol_Sphere_.getDistance_ = function(c1, c2, radius) {
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var lat1 = toRadians(c1[1]);
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var lat2 = toRadians(c2[1]);
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var deltaLatBy2 = (lat2 - lat1) / 2;
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var deltaLonBy2 = toRadians(c2[0] - c1[0]) / 2;
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var a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +
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Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *
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Math.cos(lat1) * Math.cos(lat2);
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return 2 * radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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};
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/**
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* Get the spherical area of a geometry. This is the area (in meters) assuming
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* that polygon edges are segments of great circles on a sphere.
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* @param {ol.geom.Geometry} geometry A geometry.
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* @param {SphereMetricOptions=} opt_options Options for the area
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* calculation. By default, geometries are assumed to be in 'EPSG:3857'.
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* You can change this by providing a `projection` option.
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* @return {number} The spherical area (in square meters).
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* @api
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*/
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_ol_Sphere_.getArea = function(geometry, opt_options) {
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var options = opt_options || {};
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var radius = options.radius || _ol_Sphere_.DEFAULT_RADIUS;
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var projection = options.projection || 'EPSG:3857';
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geometry = geometry.clone().transform(projection, 'EPSG:4326');
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var type = geometry.getType();
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var area = 0;
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var coordinates, coords, i, ii, j, jj;
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switch (type) {
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case GeometryType.POINT:
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case GeometryType.MULTI_POINT:
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case GeometryType.LINE_STRING:
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case GeometryType.MULTI_LINE_STRING:
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case GeometryType.LINEAR_RING: {
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break;
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}
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case GeometryType.POLYGON: {
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coordinates = /** @type {ol.geom.Polygon} */ (geometry).getCoordinates();
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area = Math.abs(_ol_Sphere_.getArea_(coordinates[0], radius));
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for (i = 1, ii = coordinates.length; i < ii; ++i) {
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area -= Math.abs(_ol_Sphere_.getArea_(coordinates[i], radius));
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}
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break;
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}
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case GeometryType.MULTI_POLYGON: {
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coordinates = /** @type {ol.geom.SimpleGeometry} */ (geometry).getCoordinates();
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for (i = 0, ii = coordinates.length; i < ii; ++i) {
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coords = coordinates[i];
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area += Math.abs(_ol_Sphere_.getArea_(coords[0], radius));
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for (j = 1, jj = coords.length; j < jj; ++j) {
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area -= Math.abs(_ol_Sphere_.getArea_(coords[j], radius));
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}
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}
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break;
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}
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case GeometryType.GEOMETRY_COLLECTION: {
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var geometries = /** @type {ol.geom.GeometryCollection} */ (geometry).getGeometries();
|
||||
for (i = 0, ii = geometries.length; i < ii; ++i) {
|
||||
area += _ol_Sphere_.getArea(geometries[i], opt_options);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
throw new Error('Unsupported geometry type: ' + type);
|
||||
}
|
||||
}
|
||||
return area;
|
||||
};
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
@@ -287,7 +151,7 @@ _ol_Sphere_.getArea = function(geometry, opt_options) {
|
||||
* @param {number} radius The sphere radius.
|
||||
* @return {number} Area (in square meters).
|
||||
*/
|
||||
_ol_Sphere_.getArea_ = function(coordinates, radius) {
|
||||
function getAreaInternal(coordinates, radius) {
|
||||
var area = 0, len = coordinates.length;
|
||||
var x1 = coordinates[len - 1][0];
|
||||
var y1 = coordinates[len - 1][1];
|
||||
@@ -300,5 +164,92 @@ _ol_Sphere_.getArea_ = function(coordinates, radius) {
|
||||
y1 = y2;
|
||||
}
|
||||
return area * radius * radius / 2.0;
|
||||
};
|
||||
export default _ol_Sphere_;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Get the spherical area of a geometry. This is the area (in meters) assuming
|
||||
* that polygon edges are segments of great circles on a sphere.
|
||||
* @param {ol.geom.Geometry} geometry A geometry.
|
||||
* @param {SphereMetricOptions=} opt_options Options for the area
|
||||
* calculation. By default, geometries are assumed to be in 'EPSG:3857'.
|
||||
* You can change this by providing a `projection` option.
|
||||
* @return {number} The spherical area (in square meters).
|
||||
* @api
|
||||
*/
|
||||
export function getArea(geometry, opt_options) {
|
||||
var options = opt_options || {};
|
||||
var radius = options.radius || DEFAULT_RADIUS;
|
||||
var projection = options.projection || 'EPSG:3857';
|
||||
var type = geometry.getType();
|
||||
if (type !== GeometryType.GEOMETRY_COLLECTION) {
|
||||
geometry = geometry.clone().transform(projection, 'EPSG:4326');
|
||||
}
|
||||
var area = 0;
|
||||
var coordinates, coords, i, ii, j, jj;
|
||||
switch (type) {
|
||||
case GeometryType.POINT:
|
||||
case GeometryType.MULTI_POINT:
|
||||
case GeometryType.LINE_STRING:
|
||||
case GeometryType.MULTI_LINE_STRING:
|
||||
case GeometryType.LINEAR_RING: {
|
||||
break;
|
||||
}
|
||||
case GeometryType.POLYGON: {
|
||||
coordinates = /** @type {ol.geom.Polygon} */ (geometry).getCoordinates();
|
||||
area = Math.abs(getAreaInternal(coordinates[0], radius));
|
||||
for (i = 1, ii = coordinates.length; i < ii; ++i) {
|
||||
area -= Math.abs(getAreaInternal(coordinates[i], radius));
|
||||
}
|
||||
break;
|
||||
}
|
||||
case GeometryType.MULTI_POLYGON: {
|
||||
coordinates = /** @type {ol.geom.SimpleGeometry} */ (geometry).getCoordinates();
|
||||
for (i = 0, ii = coordinates.length; i < ii; ++i) {
|
||||
coords = coordinates[i];
|
||||
area += Math.abs(getAreaInternal(coords[0], radius));
|
||||
for (j = 1, jj = coords.length; j < jj; ++j) {
|
||||
area -= Math.abs(getAreaInternal(coords[j], radius));
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
case GeometryType.GEOMETRY_COLLECTION: {
|
||||
var geometries = /** @type {ol.geom.GeometryCollection} */ (geometry).getGeometries();
|
||||
for (i = 0, ii = geometries.length; i < ii; ++i) {
|
||||
area += getArea(geometries[i], opt_options);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
throw new Error('Unsupported geometry type: ' + type);
|
||||
}
|
||||
}
|
||||
return area;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Returns the coordinate at the given distance and bearing from `c1`.
|
||||
*
|
||||
* @param {ol.Coordinate} c1 The origin point (`[lon, lat]` in degrees).
|
||||
* @param {number} distance The great-circle distance between the origin
|
||||
* point and the target point.
|
||||
* @param {number} bearing The bearing (in radians).
|
||||
* @param {number=} opt_radius The sphere radius to use. Defaults to the Earth's
|
||||
* mean radius using the WGS84 ellipsoid.
|
||||
* @return {ol.Coordinate} The target point.
|
||||
*/
|
||||
export function offset(c1, distance, bearing, opt_radius) {
|
||||
var radius = opt_radius || DEFAULT_RADIUS;
|
||||
var lat1 = toRadians(c1[1]);
|
||||
var lon1 = toRadians(c1[0]);
|
||||
var dByR = distance / radius;
|
||||
var lat = Math.asin(
|
||||
Math.sin(lat1) * Math.cos(dByR) +
|
||||
Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
|
||||
var lon = lon1 + Math.atan2(
|
||||
Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
|
||||
Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
|
||||
return [toDegrees(lon), toDegrees(lat)];
|
||||
}
|
||||
Reference in New Issue
Block a user