Optimized rendering of graph layout and zooming events

client/app/scripts/utils/node-shape-utils.js

@@ -0,0 +1,12 @@
+import { line, curveCardinalClosed } from 'd3-shape';
+import range from 'lodash/range';
+
+const shapeSpline = line().curve(curveCardinalClosed.tension(0.65));
+
+export function nodeShapePolygon(radius, n) {
+  const innerAngle = (2 * Math.PI) / n;
+  return shapeSpline(range(0, n).map(k => [
+    radius * Math.sin(k * innerAngle),
+    -radius * Math.cos(k * innerAngle)
+  ]));
+}