transitions, fix colors, add help

1 files changed, 10 insertions, 5 deletions

diff --git a/client/lib/util.js b/client/lib/util.js
index 5bf93dc..d0a3914 100644
--- a/client/lib/util.js
+++ b/client/lib/util.js
@@ -23,10 +23,13 @@ function choice(a) {
 function mod(n, m) {
   return n - m * Math.floor(n / m);
 }
-function roundFreq(freq) {
-  return Math.round(freq * 100);
+function roundInterval(interval) {
+  return Math.round(interval * 10000000);
 }
-const frequencyInRange = (freq) => 20 < freq && freq < 15000;
+const intervalInRange = (interval, root) =>
+  20 < interval * root && interval * root < 15000;
+const lerp = (n, a, b) => (b - a) * n + a;
+const clamp = (n, a = 0, b = 1) => (n < a ? a : n < b ? n : b);
 
 function requestAudioContext(fn) {
   if (window.location.protocol !== "https:") {
@@ -75,7 +78,9 @@ export {
   choice,
   mod,
   browser,
-  roundFreq,
-  frequencyInRange,
+  lerp,
+  clamp,
+  roundInterval,
+  intervalInRange,
   requestAudioContext,
 };