how walk should progress

tests/s2-node-hilbert.js

@@ -0,0 +1,39 @@
+var S2 = require('s2geometry-node');
+var lat = 40.2574448;
+var lng = -111.7089464;
+
+var s2latlng = new S2.S2LatLng(lat, lng);
+var point;
+var cellId = new S2.S2CellId(s2latlng).parent(15);
+var cell;
+//var cell = new S2.S2Cell(cellId.toLatLng());
+
+var walk = [];
+var next = cellId;
+var prev = cellId;
+var i;
+
+cell = new S2.S2Cell(cellId);
+console.log(cell.face(), cellId.id(), cellId.toString(), cellId.toLatLng().toString(), cellId.level());
+for (i = 0; i < 10; i += 1) {
+  next = next.next();
+  prev = prev.prev();
+
+  walk.push(next);
+  walk.push(prev);
+
+  cell = new S2.S2Cell(next);
+  console.log(cell.face(), next.id(), next.toString(), next.toLatLng().toString(), next.level());
+  cell = new S2.S2Cell(prev);
+  console.log(cell.face(), prev.id(), prev.toString(), prev.toLatLng().toString(), prev.level());
+}
+
+/*
+console.log(cell.id().toString());
+var latlng = cell.toLatLng();
+console.log(cellId.toString());
+console.log(cellId.face().toString());
+console.log(cell.orientation().toString());
+console.log(cellId.level().toString());
+console.log(latlng.lat.toString(), latlng.lng.toString());
+*/