mapp.utils.polygonIntersectFeatures

lib/utils/_utils.mjs

@@ -66,6 +66,8 @@ import merge from './merge.mjs'
 
 import paramString from './paramString.mjs'
 
+import {polygonIntersectFeatures} from './polygonIntersectFeatures.mjs'
+
 import promiseAll from './promiseAll.mjs'
 
 import queryParams from './queryParams.mjs'
@@ -98,6 +100,7 @@ export default {
   merge,
   olScript,
   paramString,
+  polygonIntersectFeatures,
   promiseAll,
   queryParams,
   style,

lib/utils/polygonIntersectFeatures.mjs

@@ -0,0 +1,59 @@
+/**
+## mapp.utils.polygonIntersectFeatures()
+
+@module /utils/polygonIntersectFeatures
+*/
+
+/**
+ * Checks if features intersect with a drawn polygon on a map view.
+ * @function polygonIntersectFeatures
+ * @param {Object} params - The parameters for the function.
+ * @param {Object} params.mapview - The map view instance.
+ * @param {Function} [params.drawendCallback] - Callback function to be called with intersecting features.
+ * @param {Object} [params.interaction] - Additional interaction options to be merged with the default config.
+ */
+export function polygonIntersectFeatures(params) {
+
+  if (!params.mapview) return;
+
+  function getArrayDepth(arr) {
+    return Array.isArray(arr) ?
+      1 + Math.max(0, ...arr.map(getArrayDepth)) :
+      0;
+  }
+
+  // Config for mapview draw interaction.
+  let interaction = {
+
+    // Draw polygon.
+    type: 'Polygon',
+
+    drawend: e => {
+
+      const poly = e.feature
+
+      const polyGeom = poly.getGeometry()
+
+      let features = params.mapview.interaction.snap.source.getFeatures()
+
+      features = features
+        .filter(feature => {
+
+          let coordinates = feature.getGeometry().getCoordinates()//.flat(2)
+
+          coordinates = coordinates.flat(getArrayDepth(coordinates) - 2)
+
+          return coordinates.some(coord => polyGeom.intersectsCoordinate(coord))
+        })
+
+      if (params.drawendCallback) {
+
+        params.drawendCallback(features)
+      }
+    },
+    ...params
+  }
+
+  // Initiate drawing on mapview with config as interaction argument.
+  params.mapview.interactions.draw(interaction)
+}