Initial commit

1 files changed, 16 insertions, 0 deletions

diff --git a/util/smoothen.js b/util/smoothen.js
new file mode 100644
index 0000000..55ba23c
--- /dev/null
+++ b/util/smoothen.js
@@ -0,0 +1,16 @@
+module.exports = function(tx, x, divisor) {
+  // Smoothly transitions givens X to TX using a given divisor. Rounds the
+  // amount moved.
+
+  const move = (tx - x) / divisor
+
+  if (move > 0.5) {
+    return x + Math.ceil(move)
+  } else if (move < -0.5) {
+    return x + Math.floor(move)
+  } else if (tx > 0) {
+    return Math.ceil(tx)
+  } else {
+    return Math.floor(tx)
+  }
+}