Fix node size (#56)

* Fix node size

* simplify

frontend/src/components/Map/Location.tsx

@@ -39,18 +39,19 @@ interface LocationState {
   hover: boolean;
 }
 
+// logarithmic scale for location dots
+const getNodeSize = (nodeCount: number) => {
+  return 6 + Math.log(nodeCount) * 2;
+};
+
 export class Location extends React.Component<LocationProps, LocationState> {
   public readonly state = { hover: false };
 
   public render() {
     const { position, nodeCount } = this.props;
     const { left, top, quarter } = position;
     const className = `Location Location-quarter${quarter}`;
-
-    // location dots have logarithmic scale
-    // 6px is default size for a single node dot,
-    // log of 1 is 0, so we have fallback value of 1
-    const size = 6 * (Math.log(nodeCount) || 1);
+    const size = getNodeSize(nodeCount);
 
     return (
       <div