146 lines
3.7 KiB
JavaScript
146 lines
3.7 KiB
JavaScript
goog.provide('ol.io.geojson');
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goog.require('ol.geom.Geometry');
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goog.require('ol.geom.LineString');
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goog.require('ol.geom.MultiLineString');
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goog.require('ol.geom.MultiPoint');
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goog.require('ol.geom.MultiPolygon');
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goog.require('ol.geom.Point');
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goog.require('ol.geom.Polygon');
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/**
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* Parse a GeoJSON string.
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* @param {string} str GeoJSON string.
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* @return {ol.geom.Geometry|Array.<ol.geom.Geometry>} Parsed geometry or array
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* of geometries.
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*/
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ol.io.geojson.read = function(str) {
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// TODO: add options and accept projection
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var json = /** @type {GeoJSONObject} */ (JSON.parse(str));
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return ol.io.geojson.parse_(json);
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};
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/**
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* @param {GeoJSONObject} json GeoJSON object.
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* @return {ol.geom.Geometry|Array.<ol.geom.Geometry>} Parsed geometry or array
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* of geometries.
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* @private
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*/
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ol.io.geojson.parse_ = function(json) {
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var result;
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switch (json.type) {
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case 'GeometryCollection':
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result = ol.io.geojson.parseGeometryCollection_(
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/** @type {GeoJSONGeometryCollection} */ (json));
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break;
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case 'Point':
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result = ol.io.geojson.parsePoint_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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case 'LineString':
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result = ol.io.geojson.parseLineString_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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case 'Polygon':
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result = ol.io.geojson.parsePolygon_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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case 'MultiPoint':
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result = ol.io.geojson.parseMultiPoint_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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case 'MultiLineString':
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result = ol.io.geojson.parseMultiLineString_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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case 'MultiPolygon':
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result = ol.io.geojson.parseMultiPolygon_(
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/** @type {GeoJSONGeometry} */ (json));
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break;
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default:
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throw new Error('GeoJSON parsing not implemented for type: ' + json.type);
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}
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return result;
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};
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/**
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* @param {GeoJSONGeometryCollection} json GeoJSON geometry collection.
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* @return {Array.<ol.geom.Geometry>} Parsed array of geometries.
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* @private
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*/
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ol.io.geojson.parseGeometryCollection_ = function(json) {
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var geometries = json.geometries,
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len = geometries.length,
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result = new Array(len),
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i;
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for (i = 0; i < len; ++i) {
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result[i] = ol.io.geojson.parse_(
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/** @type {GeoJSONGeometry} */ (geometries[i]));
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}
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return result;
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON linestring.
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* @return {ol.geom.LineString} Parsed linestring.
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* @private
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*/
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ol.io.geojson.parseLineString_ = function(json) {
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return new ol.geom.LineString(json.coordinates);
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON multi-linestring.
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* @return {ol.geom.MultiLineString} Parsed multi-linestring.
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* @private
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*/
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ol.io.geojson.parseMultiLineString_ = function(json) {
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return new ol.geom.MultiLineString(json.coordinates);
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON multi-point.
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* @return {ol.geom.MultiPoint} Parsed multi-point.
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* @private
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*/
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ol.io.geojson.parseMultiPoint_ = function(json) {
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return new ol.geom.MultiPoint(json.coordinates);
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON multi-polygon.
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* @return {ol.geom.MultiPolygon} Parsed multi-polygon.
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* @private
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*/
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ol.io.geojson.parseMultiPolygon_ = function(json) {
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return new ol.geom.MultiPolygon(json.coordinates);
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON point.
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* @return {ol.geom.Point} Parsed multi-point.
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* @private
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*/
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ol.io.geojson.parsePoint_ = function(json) {
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return new ol.geom.Point(json.coordinates);
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};
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/**
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* @param {GeoJSONGeometry} json GeoJSON polygon.
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* @return {ol.geom.Polygon} Parsed polygon.
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* @private
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*/
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ol.io.geojson.parsePolygon_ = function(json) {
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return new ol.geom.Polygon(json.coordinates);
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};
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