added function for expanding collections

README.md

@@ -1,5 +1,3 @@
 # wktmap
 
 Code for <https://wktmap.com>.
-
-This page parses and visualizes [WKT](https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry) (ISO 13249) as well as [geo:wktLiteral](https://opengeospatial.github.io/ogc-geosparql/geosparql11/spec.html#_rdfs_datatype_geowktliteral) strings in a variety of coordinate reference systems. Built with [OpenLayers](https://openlayers.org/), [Leaflet](https://leafletjs.com/), [Proj4js](https://trac.osgeo.org/proj4js), and [epsg.io](https://epsg.io/).

src/App.js

@@ -13,7 +13,7 @@ import CRC32 from "crc-32";
 import { EditControl } from "react-leaflet-draw";
 import { geojsonToWKT } from "@terraformer/wkt";
 import ReactGA from "react-ga4";
-import { transformInput, ValueError } from "./wkt";
+import { transformInput, ValueError, expandCollections } from "./wkt";
 
 const DEFAULT_EPSG = "4326";
 
@@ -141,7 +141,7 @@ function App() {
   }, [map]); // eslint-disable-line react-hooks/exhaustive-deps
 
   function handleDrawStop() {
-    const geometries = [];
+    let geometries = [];
     groupRef.current.eachLayer(function(layer) {
       const geo = layer.toGeoJSON();
       if (geo.type === "Feature") {
@@ -153,10 +153,10 @@ function App() {
       }
     });
     let wkt;
+    geometries = expandCollections(geometries);
     if (geometries.length === 1) {
       wkt = geometries[0];
     } else if (geometries.length > 1) {
-      // TODO: fix for existing GEOMETRYCOLLECTION (should not be nested)
       wkt = "GEOMETRYCOLLECTION(" + geometries.join(", ") + ")";
     }
     setEpsg(4326);

src/wkt.js

@@ -136,4 +136,13 @@ async function transformInput(input) {
 
 }
 
-export { parseWkt, transformInput, ValueError, fetchProj, extractAndParseCrs };
+function expandCollections(geometries) {
+    // TODO: fix for existing GEOMETRYCOLLECTION (should not be nested)
+    geometries.reduce(function(acc, current) {
+      acc.push(current);
+      return acc;
+    }, []);
+    return geometries;
+}
+
+export { parseWkt, transformInput, ValueError, fetchProj, extractAndParseCrs, expandCollections };