mirror of
https://github.com/Jermolene/TiddlyWiki5
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46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
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/*\
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title: $:/plugins/tiddlywiki/geospatial/operators/lookup.js
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type: application/javascript
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module-type: filteroperator
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Filter operators for geospatial lookup
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var turf = require("$:/plugins/tiddlywiki/geospatial/turf.js"),
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geotools = require("$:/plugins/tiddlywiki/geospatial/geotools.js");
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exports.geolookup = function(source,operator,options) {
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// Get the GeoJSON object
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var output = [],
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jsonObject = $tw.utils.parseJSONSafe(operator.operands[0],null);
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if(jsonObject) {
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// Process the input points
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source(function(tiddler,title) {
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var point = geotools.parsePoint(title),
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result = getPolygonsContainingPoint(jsonObject,point);
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output.push(JSON.stringify(result))
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});
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}
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// Perform the transformation
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return output;
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};
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function getPolygonsContainingPoint(featureCollection,point) {
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// Filter the GeoJSON feature collection to only include polygon features containing the point
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const properties = [];
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turf.featureEach(featureCollection,function(feature) {
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if(feature.geometry.type === "Polygon" && turf.booleanPointInPolygon(point,feature)) {
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properties.push(feature.properties);
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}
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});
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return properties;
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}
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})();
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