mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-06-28 00:03:16 +00:00
89 lines
2.5 KiB
JavaScript
89 lines
2.5 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/geospatial/operators/transformation.js
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type: application/javascript
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module-type: filteroperator
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Filter operators for geospatial transformation
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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.geounion = makeTransformation("union");
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exports.geointersect = makeTransformation("intersect");
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exports.geodifference = makeTransformation("difference");
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function makeTransformation(methodName) {
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return function(source,operator,options) {
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// Collect the input
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var jsonObjects = [];
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source(function(tiddler,title) {
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var jsonObject = $tw.utils.parseJSONSafe(title,null);
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if(jsonObject) {
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jsonObjects.push(jsonObject)
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}
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});
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// Perform the transformation
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var result = geojsonOp(jsonObjects,methodName);
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return [JSON.stringify(result)];
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};
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}
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function geojsonOp(geojsonObjects, op) {
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var resultFeatures = [];
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$tw.utils.each(geojsonObjects,function (geojson1) {
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if(geojson1.type === "FeatureCollection") {
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resultFeatures = resultFeatures.length ? resultFeatures : geojson1.features;
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} else if(geojson1.type === "Feature") {
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resultFeatures = resultFeatures.length ? resultFeatures : [geojson1];
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}
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$tw.utils.each(geojsonObjects,function (geojson2) {
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if(geojson1 !== geojson2) {
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var newResultFeatures = [];
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$tw.utils.each(resultFeatures,function (feature1) {
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if(geojson2.type === "FeatureCollection") {
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$tw.utils.each(geojson2.features,function (feature2) {
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var result;
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if(op === "union") {
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result = turf.union(feature1, feature2);
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} else if(op === "intersect") {
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result = turf.intersect(feature1, feature2);
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} else if(op === "difference") {
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result = turf.difference(feature1, feature2);
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}
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if(result) {
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newResultFeatures.push(result);
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}
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});
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} else if(geojson2.type === "Feature") {
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var result;
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if(op === "union") {
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result = turf.union(feature1, geojson2);
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} else if(op === "intersect") {
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result = turf.intersect(feature1, geojson2);
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} else if(op === "difference") {
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result = turf.difference(feature1, geojson2);
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}
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if(result) {
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newResultFeatures.push(result);
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}
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}
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});
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resultFeatures = newResultFeatures;
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}
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});
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});
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return turf.featureCollection(resultFeatures);
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}
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})();
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