2 files changed, 62 insertions, 0 deletions
diff --git a/src/lib/MarkerClusterGroup.js b/src/lib/MarkerClusterGroup.js
new file mode 100644
index 0000000..70e2134
--- /dev/null
+++ b/src/lib/MarkerClusterGroup.js
@@ -0,0 +1,32 @@
+import L from 'leaflet'
+import { createPathComponent } from '@react-leaflet/core'
+import 'leaflet.markercluster'
+
+function createMarkerCluster({ children: _c, ...props }, context) {
+  const clusterProps = {}
+  const clusterEvents = {}
+  // Splitting props and events to different objects
+  Object.entries(props).forEach(([propName, prop]) =>
+    propName.startsWith('on')
+      ? (clusterEvents[propName] = prop)
+      : (clusterProps[propName] = prop)
+  )
+  const instance = new L.MarkerClusterGroup(clusterProps)
+
+  // Initializing event listeners
+  Object.entries(clusterEvents).forEach(([eventAsProp, callback]) => {
+    const clusterEvent = `cluster${eventAsProp.substring(2).toLowerCase()}`
+    instance.on(clusterEvent, callback)
+  })
+  return {
+    instance,
+    context: {
+      ...context,
+      layerContainer: instance,
+    },
+  }
+}
+
+const MarkerClusterGroup = createPathComponent(createMarkerCluster)
+
+export default MarkerClusterGroup
+\ No newline at end of file
diff --git a/src/lib/util.ts b/src/lib/util.ts
new file mode 100644
index 0000000..1b000c0
--- /dev/null
+++ b/src/lib/util.ts
@@ -0,0 +1,30 @@
+/**
+ * Converts time in seconds to HH:mm format.
+ * @param time Time to convert in seconds.
+ */
+export function secondsToTimeString(time: number): string {
+  const h = Math.floor(time / 3600);
+  const m = Math.floor((time % 3600) / 60);
+
+  return `${h < 10 ? `0${h}` : h}:${m < 10 ? `0${m}` : m}`;
+}
+
+/**
+ * Calculates distance between two geographical points.
+ * @param latlng1 Coordinates of the first point.
+ * @param latlng2 Coordinates of the second point.
+ */
+export function distanceBetween(latlng1: number[], latlng2: number[]): number {
+  const R = 6371000;
+  const rad = Math.PI / 180;
+  const lat1 = latlng1[0] * rad;
+  const lat2 = latlng2[0] * rad;
+  const sinDLat = Math.sin(((latlng2[0] - latlng1[0]) * rad) / 2);
+  const sinDLon = Math.sin(((latlng2[1] - latlng1[1]) * rad) / 2);
+  const a = sinDLat * sinDLat + Math.cos(lat1) * Math.cos(lat2) * sinDLon * sinDLon;
+  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+
+  return R * c;
+}
+
+export default { secondsToTimeString, distanceBetween };