feat: improve contours caching calculation

package.json

@@ -81,7 +81,7 @@
     "ml-array-median": "^1.1.6",
     "ml-array-xy-equally-spaced": "^1.2.1",
     "ml-baseline-correction-regression": "^2.0.1",
-    "ml-conrec": "^5.0.2",
+    "ml-conrec": "^5.0.3",
     "ml-gsd": "^12.1.6",
     "ml-matrix": "^6.11.1",
     "ml-signal-processing": "^1.0.4",

src/component/2d/ft/Contours.tsx

@@ -75,19 +75,8 @@ function ContoursPaths({
 }: ContoursPathsProps) {
   const activeSpectrum = useActiveSpectrum();
   const preferences = usePreferences();
-  const level = useContoursLevel(spectrum, sign);
 
-  const contours = useMemo(() => {
-    const { contours, timeout } = drawContours(
-      level,
-      spectrum,
-      sign === 'negative',
-    );
-    if (timeout) {
-      onTimeout();
-    }
-    return contours;
-  }, [spectrum, level, onTimeout, sign]);
+  const contours = useContours(spectrum, sign, onTimeout);
 
   const path = usePath(spectrum, contours);
 
@@ -171,3 +160,19 @@ export default function Contours() {
 
   return <MemoizedContours {...{ spectra: spectra2d, displayerKey }} />;
 }
+
+function useContours(spectrum: Spectrum2D, sign, onTimeout) {
+  const cache = useRef(new Map());
+  const level = useContoursLevel(spectrum, sign);
+
+  return useMemo(() => {
+    const { contours, timeout } = drawContours(spectrum, level, {
+      negative: sign === 'negative',
+      cache: cache.current,
+    });
+    if (timeout) {
+      onTimeout();
+    }
+    return contours;
+  }, [spectrum, level, onTimeout, sign]);
+}