begin reimplementing draw logic for parallel use

packages/react/src/hooks/usePatternFrame.mjs

@@ -0,0 +1,34 @@
+import { useCallback, useEffect, useRef } from 'react';
+import 'tailwindcss/tailwind.css';
+import useFrame from '../hooks/useFrame.mjs';
+
+function usePatternFrame({ pattern, started, getTime, onDraw }) {
+  let visibleHaps = useRef([]);
+  let lastFrame = useRef(null);
+  const { start: startFrame, stop: stopFrame } = useFrame(
+    useCallback(() => {
+      const phase = getTime();
+      if (lastFrame.current === null) {
+        lastFrame.current = phase;
+        return;
+      }
+      const haps = pattern.queryArc(Math.max(lastFrame.current, phase - 1 / 10), phase);
+      const cycles = 4;
+      lastFrame.current = phase;
+      visibleHaps.current = (visibleHaps.current || [])
+        .filter((h) => h.whole.end > phase - cycles) // in frame
+        .concat(haps.filter((h) => h.hasOnset()));
+      onDraw(phase, visibleHaps.current);
+    }, [pattern]),
+  );
+  useEffect(() => {
+    if (started) {
+      startFrame();
+    } else {
+      visibleHaps.current = [];
+      stopFrame();
+    }
+  }, [started]);
+}
+
+export default usePatternFrame;