stable: finalized GIS aesthetics and Syria/Jordan routing synchronization

apps/web/src/utils/polyline.ts

@@ -0,0 +1,49 @@
+/**
+ * Decodes an encoded Polyline string into an array of [lng, lat] coordinates.
+ * @param str The encoded polyline string
+ * @param precision The precision of the coordinates (default 5 for Google Polyline)
+ * @returns Array of [lng, lat] coordinates
+ */
+export function decodePolyline(str: string, precision: number = 5): [number, number][] {
+  let index = 0;
+  let lat = 0;
+  let lng = 0;
+  const coordinates: [number, number][] = [];
+  let shift = 0;
+  let result = 0;
+  let byte: number | null = null;
+  let latitude_change: number;
+  let longitude_change: number;
+  const factor = Math.pow(10, precision);
+
+  while (index < str.length) {
+    byte = null;
+    shift = 0;
+    result = 0;
+
+    do {
+      byte = str.charCodeAt(index++) - 63;
+      result |= (byte & 0x1f) << shift;
+      shift += 5;
+    } while (byte >= 0x20);
+
+    latitude_change = ((result & 1) ? ~(result >> 1) : (result >> 1));
+    lat += latitude_change;
+
+    shift = 0;
+    result = 0;
+
+    do {
+      byte = str.charCodeAt(index++) - 63;
+      result |= (byte & 0x1f) << shift;
+      shift += 5;
+    } while (byte >= 0x20);
+
+    longitude_change = ((result & 1) ? ~(result >> 1) : (result >> 1));
+    lng += longitude_change;
+
+    coordinates.push([lng / factor, lat / factor]);
+  }
+
+  return coordinates;
+}