feat: honor MIDI input notes' velocity during recording

2026-05-04 19:34:54 -07:00
parent 066946ea64
commit d089456676
7 changed files with 101 additions and 35 deletions
@@ -0,0 +1,23 @@
+// Purple (vel=0) -> green (vel=64) -> red (vel=127), matching the piano roll note colors.
+export function velocityToColor(v: number, alpha = 1): string {
+  const clampedVelocity = Math.max(0, Math.min(127, v));
+  const lerp = (a: number, b: number, t: number) => Math.round(a + (b - a) * t);
+
+  let r: number;
+  let g: number;
+  let b: number;
+
+  if (clampedVelocity <= 64) {
+    const t = clampedVelocity / 64;
+    r = lerp(123, 90, t);
+    g = lerp(95, 176, t);
+    b = lerp(160, 106, t);
+  } else {
+    const t = (clampedVelocity - 64) / 63;
+    r = lerp(90, 255, t);
+    g = lerp(176, 85, t);
+    b = lerp(106, 85, t);
+  }
+
+  return alpha === 1 ? `rgb(${r}, ${g}, ${b})` : `rgba(${r}, ${g}, ${b}, ${alpha})`;
+}