mirror of
https://github.com/Jermolene/TiddlyWiki5
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55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/geospatial/operators/measurement.js
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type: application/javascript
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module-type: filteroperator
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Filter operators for geospatial measurement
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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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var VALID_UNITS = ["miles","kilometers","radians","degrees"],
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DEFAULT_UNITS = "miles";
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exports.geodistance = function(source,operator,options) {
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var from = geotools.parsePoint(operator.operands[0]),
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to = geotools.parsePoint(operator.operands[1]),
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units = operator.operands[2] || DEFAULT_UNITS;
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if(VALID_UNITS.indexOf(units) === -1) {
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units = DEFAULT_UNITS;
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}
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return [JSON.stringify(turf.distance(from,to,{units: units}))];
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};
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exports.geonearestpoint = function(source,operator,options) {
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var target = geotools.parsePoint(operator.operands[0]),
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featureCollection = {
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"type": "FeatureCollection",
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"features": []
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};
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source(function(tiddler,title) {
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var fc = $tw.utils.parseJSONSafe(title);
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if(fc) {
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if(fc.type === "FeatureCollection" && $tw.utils.isArray(fc.features)) {
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Array.prototype.push.apply(featureCollection.features,fc.features);
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} else if(fc.type === "Feature") {
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featureCollection.features.push(fc);
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}
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}
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});
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if(featureCollection.features.length > 0) {
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return [JSON.stringify(turf.nearestPoint(target,featureCollection))];
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} else {
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return [];
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}
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};
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})();
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