Bar graph added.

node_modules/d3-geo/src/distance.js

@@ -0,0 +1,10 @@
+import length from "./length.js";
+
+var coordinates = [null, null],
+    object = {type: "LineString", coordinates: coordinates};
+
+export default function(a, b) {
+  coordinates[0] = a;
+  coordinates[1] = b;
+  return length(object);
+}