Implemented 2D visualization for notes using Vue Flow

node_modules/d3-ease/src/math.js

@@ -0,0 +1,4 @@
+// tpmt is two power minus ten times t scaled to [0,1]
+export function tpmt(x) {
+  return (Math.pow(2, -10 * x) - 0.0009765625) * 1.0009775171065494;
+}