diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index b4fe272..ed98056 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -163,4 +163,12 @@ function Library (ronin) {
   this.mod = function (a, b) {
     return a % b
   }
+
+  this.clamp = function (val, min, max) {
+    return Math.min(max, Math.max(min, val))
+  }
+
+  this.step = function (val, step) {
+    return Math.round(val / step) * step
+  }
 }