mirror of
https://github.com/Jermolene/TiddlyWiki5
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d3aca065ab
This is the beginnings of a new core plugin to add geospatial capabilities, building on the JSON operators that we now have in the core. It uses the libraries leaflet.js for mapping and turf.js for geospatial calculations.
32 lines
845 B
JavaScript
32 lines
845 B
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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})();
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