Implemented 2D visualization for notes using Vue Flow

node_modules/d3-ease/src/quad.js

@@ -0,0 +1,11 @@
+export function quadIn(t) {
+  return t * t;
+}
+
+export function quadOut(t) {
+  return t * (2 - t);
+}
+
+export function quadInOut(t) {
+  return ((t *= 2) <= 1 ? t * t : --t * (2 - t) + 1) / 2;
+}