editando patterns na playlist

assets/js/creations/utils.js

@@ -195,4 +195,30 @@ export function adjustValue(inputElement, step) {
 
   inputElement.value = newValue;
   inputElement.dispatchEvent(new Event("input", { bubbles: true }));
-}
+}
+
+// ===============================
+// LMMS ticks helpers (Song Editor)
+// ===============================
+
+export const LMMS_TICKS_PER_STEP = 12;     // 1 step (1/16) = 12 ticks
+export const STEPS_PER_BAR = 16;           // 4/4: 16 steps por compasso
+export const LMMS_TICKS_PER_BAR = LMMS_TICKS_PER_STEP * STEPS_PER_BAR; // 192
+
+export function secondsToSongTicks(seconds, bpm = null) {
+  const b = bpm ?? (parseFloat(document.getElementById("bpm-input")?.value) || 120);
+  // stepIntervalSec = 60/(bpm*4) => ticksPerSec = 12/stepIntervalSec = bpm*0.8
+  const ticks = seconds * b * 0.8;
+  return Math.round(ticks);
+}
+
+export function songTicksToSeconds(ticks, bpm = null) {
+  const b = bpm ?? (parseFloat(document.getElementById("bpm-input")?.value) || 120);
+  // seconds = ticks / (bpm*0.8)
+  return ticks / (b * 0.8);
+}
+
+export function snapSongTicks(ticks, snap = LMMS_TICKS_PER_STEP) {
+  const s = Math.max(1, Math.floor(snap));
+  return Math.round(ticks / s) * s;
+}