Named exports from ol/proj/epsg3857
This commit is contained in:
Tim Schaub
@@ -1,11 +1,43 @@
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/**
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* @module ol/proj/EPSG3857
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* @module ol/proj/epsg3857
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*/
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import {inherits} from '../index.js';
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import {cosh} from '../math.js';
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import Projection from '../proj/Projection.js';
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import Units from '../proj/Units.js';
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const _ol_proj_EPSG3857_ = {};
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/**
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* Radius of WGS84 sphere
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*
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* @const
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* @type {number}
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*/
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export const RADIUS = 6378137;
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/**
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* @const
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* @type {number}
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*/
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export const HALF_SIZE = Math.PI * RADIUS;
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/**
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* @const
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* @type {ol.Extent}
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*/
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export const EXTENT = [
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-HALF_SIZE, -HALF_SIZE,
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HALF_SIZE, HALF_SIZE
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];
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/**
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* @const
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* @type {ol.Extent}
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*/
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export const WORLD_EXTENT = [-180, -85, 180, 85];
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/**
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@@ -15,54 +47,20 @@ const _ol_proj_EPSG3857_ = {};
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* @constructor
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* @extends {ol.proj.Projection}
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* @param {string} code Code.
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* @private
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*/
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_ol_proj_EPSG3857_.Projection_ = function(code) {
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function EPSG3857Projection(code) {
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Projection.call(this, {
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code: code,
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units: Units.METERS,
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extent: _ol_proj_EPSG3857_.EXTENT,
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extent: EXTENT,
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global: true,
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worldExtent: _ol_proj_EPSG3857_.WORLD_EXTENT,
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worldExtent: WORLD_EXTENT,
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getPointResolution: function(resolution, point) {
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return resolution / cosh(point[1] / _ol_proj_EPSG3857_.RADIUS);
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return resolution / cosh(point[1] / RADIUS);
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}
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});
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};
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inherits(_ol_proj_EPSG3857_.Projection_, Projection);
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/**
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* Radius of WGS84 sphere
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*
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* @const
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* @type {number}
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*/
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_ol_proj_EPSG3857_.RADIUS = 6378137;
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/**
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* @const
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* @type {number}
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*/
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_ol_proj_EPSG3857_.HALF_SIZE = Math.PI * _ol_proj_EPSG3857_.RADIUS;
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/**
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* @const
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* @type {ol.Extent}
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*/
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_ol_proj_EPSG3857_.EXTENT = [
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-_ol_proj_EPSG3857_.HALF_SIZE, -_ol_proj_EPSG3857_.HALF_SIZE,
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_ol_proj_EPSG3857_.HALF_SIZE, _ol_proj_EPSG3857_.HALF_SIZE
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];
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/**
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* @const
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* @type {ol.Extent}
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*/
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_ol_proj_EPSG3857_.WORLD_EXTENT = [-180, -85, 180, 85];
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}
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inherits(EPSG3857Projection, Projection);
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/**
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@@ -71,14 +69,14 @@ _ol_proj_EPSG3857_.WORLD_EXTENT = [-180, -85, 180, 85];
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* @const
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* @type {Array.<ol.proj.Projection>}
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*/
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_ol_proj_EPSG3857_.PROJECTIONS = [
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new _ol_proj_EPSG3857_.Projection_('EPSG:3857'),
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new _ol_proj_EPSG3857_.Projection_('EPSG:102100'),
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new _ol_proj_EPSG3857_.Projection_('EPSG:102113'),
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new _ol_proj_EPSG3857_.Projection_('EPSG:900913'),
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new _ol_proj_EPSG3857_.Projection_('urn:ogc:def:crs:EPSG:6.18:3:3857'),
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new _ol_proj_EPSG3857_.Projection_('urn:ogc:def:crs:EPSG::3857'),
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new _ol_proj_EPSG3857_.Projection_('http://www.opengis.net/gml/srs/epsg.xml#3857')
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export const PROJECTIONS = [
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new EPSG3857Projection('EPSG:3857'),
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new EPSG3857Projection('EPSG:102100'),
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new EPSG3857Projection('EPSG:102113'),
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new EPSG3857Projection('EPSG:900913'),
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new EPSG3857Projection('urn:ogc:def:crs:EPSG:6.18:3:3857'),
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new EPSG3857Projection('urn:ogc:def:crs:EPSG::3857'),
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new EPSG3857Projection('http://www.opengis.net/gml/srs/epsg.xml#3857')
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];
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@@ -90,7 +88,7 @@ _ol_proj_EPSG3857_.PROJECTIONS = [
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* @param {number=} opt_dimension Dimension (default is `2`).
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* @return {Array.<number>} Output array of coordinate values.
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*/
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_ol_proj_EPSG3857_.fromEPSG4326 = function(input, opt_output, opt_dimension) {
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export function fromEPSG4326(input, opt_output, opt_dimension) {
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const length = input.length;
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const dimension = opt_dimension > 1 ? opt_dimension : 2;
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let output = opt_output;
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@@ -102,10 +100,10 @@ _ol_proj_EPSG3857_.fromEPSG4326 = function(input, opt_output, opt_dimension) {
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output = new Array(length);
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}
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}
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const halfSize = _ol_proj_EPSG3857_.HALF_SIZE;
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const halfSize = HALF_SIZE;
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for (let i = 0; i < length; i += dimension) {
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output[i] = halfSize * input[i] / 180;
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let y = _ol_proj_EPSG3857_.RADIUS *
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let y = RADIUS *
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Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));
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if (y > halfSize) {
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y = halfSize;
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@@ -115,7 +113,7 @@ _ol_proj_EPSG3857_.fromEPSG4326 = function(input, opt_output, opt_dimension) {
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output[i + 1] = y;
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}
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return output;
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};
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}
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/**
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@@ -126,7 +124,7 @@ _ol_proj_EPSG3857_.fromEPSG4326 = function(input, opt_output, opt_dimension) {
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* @param {number=} opt_dimension Dimension (default is `2`).
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* @return {Array.<number>} Output array of coordinate values.
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*/
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_ol_proj_EPSG3857_.toEPSG4326 = function(input, opt_output, opt_dimension) {
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export function toEPSG4326(input, opt_output, opt_dimension) {
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const length = input.length;
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const dimension = opt_dimension > 1 ? opt_dimension : 2;
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let output = opt_output;
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@@ -139,10 +137,9 @@ _ol_proj_EPSG3857_.toEPSG4326 = function(input, opt_output, opt_dimension) {
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}
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}
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for (let i = 0; i < length; i += dimension) {
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output[i] = 180 * input[i] / _ol_proj_EPSG3857_.HALF_SIZE;
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output[i] = 180 * input[i] / HALF_SIZE;
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output[i + 1] = 360 * Math.atan(
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Math.exp(input[i + 1] / _ol_proj_EPSG3857_.RADIUS)) / Math.PI - 90;
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Math.exp(input[i + 1] / RADIUS)) / Math.PI - 90;
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}
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return output;
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};
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export default _ol_proj_EPSG3857_;
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}
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