update to save state into the hash

src/App.tsx

@@ -1,4 +1,4 @@
-import { Canvas } from "@react-three/fiber";
+import { Canvas, useThree } from "@react-three/fiber";
 import { OrbitControls } from "@react-three/drei";
 
 import styles from "./styles.module.scss";
@@ -6,39 +6,105 @@ import "katex/dist/katex.min.css";
 import Point from "./components/Point";
 import Path from "./components/Path";
 import { SettingsBox } from "./SettingsContext";
+import { useCallback, useState } from "react";
+import { atom, useAtom, useSetAtom } from "jotai";
 
 // https://threejs.org/manual/#en/align-html-elements-to-3d
 
+type coord = [number, number, number];
+const coords: coord[] = [
+  [0, 0, 0],
+  [0, 0, 1],
+  [0, 1, 0],
+  [0, 1, 1],
+  [1, 0, 0],
+  [1, 0, 1],
+  [1, 1, 0],
+  [1, 1, 1],
+];
+
+const ppCoord = (c: coord): string => c.map((n) => n.toString()).join("");
+
+const offset = (a: coord): coord => [a[0] - 0.5, a[1] - 0.5, a[2] - 0.5];
+
+const offsetCoords: [string, coord][] = coords.map((a) => [
+  ppCoord(a),
+  offset(a),
+]);
+
+function getInitialValue() {
+  try {
+    const h = location.hash;
+    if (h.length === 0) return defaultValues;
+    return JSON.parse(atob(h.replace("#", "")));
+  } catch (e) {
+    console.log("error", e);
+    return defaultValues;
+  }
+}
+
+export const stateAtom = atom<{ [_: string]: string }>(getInitialValue());
+
+export const updateStateAtom = atom(null, (get, set, newValue) => {
+  set(stateAtom, newValue);
+  location.hash = btoa(JSON.stringify(newValue));
+});
+
+function AdjustCamera() {
+  useThree(({ camera }) => {
+    camera.position.z = 2;
+  });
+  return <></>;
+}
+
+const paths: [string, [coord, coord]][] = offsetCoords
+  .flatMap((a) => offsetCoords.map((b) => [a, b]))
+  .filter(
+    ([[_a, [a1, a2, a3]], [_b, [b1, b2, b3]]]) =>
+      [a1 === b1 ? 1 : 0, a2 === b2 ? 1 : 0, a3 === b3 ? 1 : 0].reduce(
+        (x, y) => x + y
+      ) === 2 &&
+      a1 <= b1 &&
+      a2 <= b2 &&
+      a3 <= b3
+  )
+  .map(([[aname, acoord], [bname, bcoord]]) => [
+    aname + bname,
+    [acoord, bcoord],
+  ]);
+
+const defaultValues: [string, string] = Object.fromEntries([
+  ...offsetCoords.map(([a]) => [a, ""]),
+  ...paths.map(([a]) => [a, ""]),
+]);
+
+function parseCoord(s: string): coord {
+  return offset(s.split("").map((n) => parseInt(n)));
+}
+
+function parsePath(s: string): [coord, coord] {
+  return [parseCoord(s.substring(0, 3)), parseCoord(s.substring(3, 6))];
+}
+
 function App() {
-  let coords: [number, number, number][] = [
-    [0, 0, 0],
-    [0, 0, 1],
-    [0, 1, 0],
-    [0, 1, 1],
-    [1, 0, 0],
-    [1, 0, 1],
-    [1, 1, 0],
-    [1, 1, 1],
-  ];
+  const [state] = useAtom(stateAtom);
+  const updateStateFunc = useSetAtom(updateStateAtom);
 
-  coords = coords.map((a) => [a[0] - 0.5, a[1] - 0.5, a[2] - 0.5]);
+  console.log("state", state);
 
-  const paths = coords
-    .flatMap((a) => coords.map((b) => [a, b]))
-    .filter(
-      ([[a1, a2, a3], [b1, b2, b3]]) =>
-        [a1 === b1 ? 1 : 0, a2 === b2 ? 1 : 0, a3 === b3 ? 1 : 0].reduce(
-          (x, y) => x + y,
-        ) === 2 &&
-        a1 <= b1 &&
-        a2 <= b2 &&
-        a3 <= b3,
-    );
+  const updateState = useCallback(
+    (z: string, value: string) => {
+      const newState = { ...state, [z]: value };
+      updateStateFunc(newState);
+    },
+    [state]
+  );
 
   return (
     <div className={styles.container}>
       <SettingsBox />
       <Canvas className={styles.canvas}>
+        <AdjustCamera />
         <OrbitControls />
         <ambientLight intensity={Math.PI / 2} />
         <spotLight
@@ -50,17 +116,34 @@ function App() {
         />
         <pointLight position={[-10, -10, -10]} decay={0} intensity={Math.PI} />
 
-        {coords.map((coord) => (
-          <Point key={JSON.stringify(coord)} coord={coord} />
-        ))}
-
-        {paths.map(([start, end]) => (
-          <Path key={JSON.stringify([start, end])} start={start} end={end} />
-        ))}
+        {Object.entries(state).map(([thing, value]) => {
+          if (thing.length === 6) {
+            const [start, end] = parsePath(thing);
+            return (
+              <Path
+                key={thing}
+                start={start}
+                end={end}
+                onEdit={(newValue) => updateState(thing, newValue)}
+                value={value}
+              />
+            );
+          } else if (thing.length === 3) {
+            const coord = parseCoord(thing);
+            return (
+              <Point
+                key={thing}
+                coord={coord}
+                onEdit={(newValue) => updateState(thing, newValue)}
+                value={value}
+              />
+            );
+          }
+        })}
       </Canvas>
       <div className={styles.footer}>
         <a
-          href="https://git.sr.ht/~mzhang/cubeviz"
+          href="https://git.mzhang.io/michael/cubeviz"
           target="_blank"
           rel="noreferrer noopener"
         >

src/SettingsContext.tsx

@@ -1,13 +1,25 @@
-import { atom, useAtom } from "jotai";
+import { atom, useAtom, useAtomValue, useSetAtom } from "jotai";
 import styles from "./styles.module.scss";
+import { stateAtom, updateStateAtom } from "./App";
+import { useCallback } from "react";
 
 export const showEmptyAtom = atom(true);
 
 export function SettingsBox() {
+  const state = useAtomValue(stateAtom);
+  const updateState = useSetAtom(updateStateAtom);
   const [showEmpty, setShowEmpty] = useAtom(showEmptyAtom);
 
+  const doClear = useCallback(() => {
+    updateState(
+      Object.fromEntries(Object.entries(state).map(([a, _]) => [a, ""]))
+    );
+  }, [state]);
+
   return (
     <div className={styles.header}>
+      <button onClick={doClear}>Clear</button>
+
       <input
         type="checkbox"
         id="showEmptyCheckbox"

src/components/EditBox.module.scss

@@ -1,5 +1,6 @@
 .editBox {
     padding: 4px;
+    transform: translateX(-50%) translateY(-50%);
 }
 
 .empty {

src/components/EditBox.tsx

@@ -1,27 +1,35 @@
-import { type FormEvent, useCallback, useState } from "react";
+import { type FormEvent, useCallback, useEffect, useState } from "react";
 import { BlockMath } from "react-katex";
 
 import styles from "./EditBox.module.scss";
 import { showEmptyAtom } from "../SettingsContext";
 import { useAtomValue } from "jotai";
 
-// export interface EditBoxProps {}
+export interface EditBoxProps {
+  value: string;
+  onUpdate?: (newValue: string) => void;
+}
 
-export default function EditBox() {
-  const [value, setValue] = useState("");
+export default function EditBox({ onUpdate, value }: EditBoxProps) {
+  const [innerValue, setInnerValue] = useState("");
   const [isEditing, setIsEditing] = useState(false);
   const showEmpty = useAtomValue(showEmptyAtom);
 
+  useEffect(() => {
+    setInnerValue(value);
+  }, [value]);
+
   const handleDblClick = useCallback(() => {
     if (!isEditing) setIsEditing(true);
   }, [isEditing]);
 
   const done = useCallback(
     (evt: FormEvent) => {
+      onUpdate?.(innerValue);
       evt.preventDefault();
       if (isEditing) setIsEditing(false);
     },
-    [isEditing],
+    [value, isEditing, innerValue]
   );
 
   return (
@@ -32,8 +40,8 @@ export default function EditBox() {
             // biome-ignore lint/a11y/noAutofocus: <explanation>
             autoFocus={true}
             onBlur={done}
-            value={value}
-            onChange={(evt) => setValue(evt.target.value)}
+            value={innerValue}
+            onChange={(evt) => setInnerValue(evt.target.value)}
             placeholder="Type latex code..."
           />
         </form>

src/components/Path.tsx

@@ -8,9 +8,11 @@ extend({ MeshLineGeometry, MeshLineMaterial });
 export interface PointProps {
   start: [number, number, number];
   end: [number, number, number];
+  value: string;
+  onEdit?: (newValue: string) => void;
 }
 
-export default function Path({ start, end }: PointProps) {
+export default function Path({ start, end, onEdit, value }: PointProps) {
   const midpoint: [number, number, number] = [
     (start[0] + end[0]) / 2.0,
     (start[1] + end[1]) / 2.0,
@@ -23,7 +25,7 @@ export default function Path({ start, end }: PointProps) {
         <meshBasicMaterial />
       </Line>
       <Html position={midpoint}>
-        <EditBox />
+        <EditBox value={value} onUpdate={onEdit} />
       </Html>
     </>
   );

src/components/Point.tsx

@@ -3,16 +3,18 @@ import EditBox from "./EditBox";
 
 export interface PointProps {
   coord: [number, number, number];
+  value: string;
+  onEdit?: (newValue: string) => void;
 }
 
-export default function Point({ coord }: PointProps) {
+export default function Point({ coord, onEdit, value }: PointProps) {
   return (
     <mesh position={coord}>
       <sphereGeometry args={[0.05]} />
       <meshStandardMaterial color="gray" />
 
       <Html>
-        <EditBox />
+        <EditBox value={value} onUpdate={onEdit} />
       </Html>
     </mesh>
   );