diff --git a/src/atoms.ts b/src/atoms.ts
index 7aaf31d..46a3494 100644
--- a/src/atoms.ts
+++ b/src/atoms.ts
@@ -13,6 +13,53 @@ export const COLORS = [
 
 type DrawMode = 'line' | 'trash' | 'grid';
 
+export interface Point {
+    x: number;
+    y: number;
+}
+
+export interface Line {
+    x0: number;
+    y0: number;
+    x1: number;
+    y1: number;
+    stroke: string;
+}
+
+export interface AddLineAction {
+    line: Line;
+}
+
+export interface AddLinesAction {
+    addLines: Line[];
+}
+
+export interface DeleteLinesAction {
+    deleteLines: Line[];
+}
+
+export type Action = AddLineAction | AddLinesAction | DeleteLinesAction;
+
+export function isAddLineAction(action: Action): action is AddLineAction {
+    return 'line' in action;
+}
+
+export function isAddLinesAction(action: Action): action is AddLinesAction {
+    return 'addLines' in action;
+}
+
+export function isDeleteLinesAction(
+    action: Action
+): action is DeleteLinesAction {
+    return 'deleteLines' in action;
+}
+
 export const lineColorState = atom<string>(COLORS[0]!);
 
 export const drawModeState = atom<DrawMode>('line');
+
+export const userLinesState = atom<Line[]>([]);
+export const userActionsState = atom<Action[]>([]);
+export const userRedoActionsState = atom<Action[]>([]);
+
+export const userStartPointState = atom<Point | null>(null);
diff --git a/src/components/grid/grid-config.tsx b/src/components/grid/grid-config.tsx
index 3b3c6b9..7196fb6 100644
--- a/src/components/grid/grid-config.tsx
+++ b/src/components/grid/grid-config.tsx
@@ -1,6 +1,21 @@
-import { ChangeEvent, FC, useCallback } from 'react';
+import { ChangeEvent, FC, useCallback, useEffect } from 'react';
+import * as lodash from 'lodash';
 import { PrimitiveAtom, useAtom } from 'jotai';
-import { COLORS, drawModeState, lineColorState } from '../../atoms';
+import {
+    Action,
+    COLORS,
+    drawModeState,
+    isAddLineAction,
+    isAddLinesAction,
+    isDeleteLinesAction,
+    Line,
+    lineColorState,
+    Point,
+    userActionsState,
+    userLinesState,
+    userRedoActionsState,
+    userStartPointState,
+} from '../../atoms';
 
 import './grid-config.scss';
 
@@ -51,6 +66,26 @@ const GridIcon = (
     </svg>
 );
 
+function useKeyPress(
+    callback: (event: KeyboardEvent) => void,
+    key: string,
+    ctrlKey: boolean = false
+) {
+    useEffect(() => {
+        const listener = (eventRaw: Event) => {
+            // eslint-disable-next-line @typescript-eslint/no-explicit-any
+            const event = eventRaw as any as KeyboardEvent;
+            if (event.key === key && event.ctrlKey === ctrlKey) {
+                callback(event);
+            }
+        };
+        window.addEventListener('keydown', listener);
+        return () => {
+            window.removeEventListener('keydown', listener);
+        };
+    }, [callback, key, ctrlKey]);
+}
+
 const ColorOption: FC<ColorOptionProps> = (props: ColorOptionProps) => {
     const { color } = props;
     const [lineColor, setLineColor] = useAtom(lineColorState);
@@ -76,17 +111,41 @@ const ColorOption: FC<ColorOptionProps> = (props: ColorOptionProps) => {
     );
 };
 
-const ColorConfig: FC = () => (
-    <div className="color-options">
-        {COLORS.map((color) => (
-            <ColorOption key={color} color={color} />
-        ))}
-    </div>
-);
+const ColorConfig: FC = () => {
+    const [userLineColor, setUserLineColor] = useAtom(lineColorState);
+    const [userDrawMode, setUserDrawMode] = useAtom(drawModeState);
+
+    const setUserColorBind = useCallback(
+        (color: string) => {
+            setUserLineColor(color);
+            setUserDrawMode('line');
+        },
+        [setUserLineColor, setUserDrawMode]
+    );
+
+    useKeyPress(() => setUserColorBind(COLORS[0]!), '1');
+    useKeyPress(() => setUserColorBind(COLORS[1]!), '2');
+    useKeyPress(() => setUserColorBind(COLORS[2]!), '3');
+    useKeyPress(() => setUserColorBind(COLORS[3]!), '4');
+    useKeyPress(() => setUserColorBind(COLORS[4]!), '5');
+    useKeyPress(() => setUserColorBind(COLORS[5]!), '6');
+    useKeyPress(() => setUserColorBind(COLORS[6]!), '7');
+    useKeyPress(() => setUserColorBind(COLORS[7]!), '8');
+
+    return (
+        <div className="color-options">
+            {COLORS.map((color) => (
+                <ColorOption key={color} color={color} />
+            ))}
+        </div>
+    );
+};
 
 const ModeConfig: FC = () => {
     const [drawMode, setDrawMode] = useAtom(drawModeState);
 
+    useKeyPress(() => setDrawMode('trash'), 't');
+
     const lineClassName = drawMode === 'line' ? 'option active' : 'option';
     const trashClassName = drawMode === 'trash' ? 'option active' : 'option';
     const gridClassName = drawMode === 'grid' ? 'option active' : 'option';
@@ -116,11 +175,92 @@ const ModeConfig: FC = () => {
     );
 };
 
-const GridConfig: FC = () => (
-    <div className="grid-config">
-        <ColorConfig />
-        <ModeConfig />
-    </div>
-);
+const StateConfig: FC = () => {
+    const [userLines, setUserLines] = useAtom(userLinesState);
+    const [userActions, setUserActions] = useAtom(userActionsState);
+    const [userRedoActions, setUserRedoActions] = useAtom(userRedoActionsState);
+
+    const [userStartPoint, setUserStartPoint] = useAtom(userStartPointState);
+
+    // ctrl+z/ctrl+y for undo/redo
+    const onUndo = useCallback(() => {
+        if (!lodash.isNull(userStartPoint)) {
+            // if the user has a start point, just cancel the pending line
+            setUserStartPoint(null);
+            return;
+        }
+
+        const action = userActions[userActions.length - 1];
+        if (!action) return;
+
+        if (isAddLineAction(action)) {
+            // remove action.line
+            setUserLines(
+                userLines.filter((userLine) => userLine !== action.line)
+            );
+        } else if (isAddLinesAction(action)) {
+            // remove all of action.addLines
+            setUserLines(
+                userLines.filter(
+                    (userLine) =>
+                        !action.addLines.find(
+                            (actionLine) => actionLine === userLine
+                        )
+                )
+            );
+        } else if (isDeleteLinesAction(action)) {
+            // add back all of action.deleteLines
+            // NOTE: this does not preserve layering
+            setUserLines([...userLines, ...action.deleteLines]);
+        } else {
+            console.error('invalid action');
+        }
+        setUserActions(userActions.slice(0, -1));
+        setUserRedoActions([...userRedoActions, action]);
+    }, [userLines, userActions, userRedoActions, userStartPoint]);
+
+    const onRedo = useCallback(() => {
+        const action = userRedoActions[userRedoActions.length - 1];
+        if (!action) return;
+
+        if (isAddLineAction(action)) {
+            // add back action.line
+            setUserLines([...userLines, action.line]);
+        } else if (isAddLinesAction(action)) {
+            // add back all of action.addLines
+            // NOTE: this does not preserve layering
+            setUserLines([...userLines, ...action.addLines]);
+        } else if (isDeleteLinesAction(action)) {
+            // remove all of action.delteLines
+            setUserLines(
+                userLines.filter(
+                    (userLine) =>
+                        !action.deleteLines.find(
+                            (actionLine) => userLine === actionLine
+                        )
+                )
+            );
+        } else {
+            throw new Error('invalid action');
+        }
+        setUserRedoActions(userRedoActions.slice(0, -1));
+        setUserActions([...userActions, action]);
+    }, [userLines, userActions, userRedoActions]);
+
+    useKeyPress(onUndo, 'z', true);
+    useKeyPress(onRedo, 'y', true);
+
+    return null;
+};
+
+const GridConfig: FC = () => {
+    return (
+        <div className="grid-config">
+            <ColorConfig />
+            <ModeConfig />
+            <StateConfig />
+        </div>
+    );
+};
 
 export default GridConfig;
diff --git a/src/components/grid/grid.tsx b/src/components/grid/grid.tsx
index 0d5ab7d..f869d8d 100644
--- a/src/components/grid/grid.tsx
+++ b/src/components/grid/grid.tsx
@@ -12,14 +12,23 @@ import {
 import './grid.scss';
 
 import * as lodash from 'lodash';
-import { COLORS, drawModeState, lineColorState } from '../../atoms';
+import {
+    COLORS,
+    drawModeState,
+    lineColorState,
+    Line,
+    Point,
+    Action,
+    AddLineAction,
+    AddLinesAction,
+    DeleteLinesAction,
+    userLinesState,
+    userActionsState,
+    userRedoActionsState,
+    userStartPointState,
+} from '../../atoms';
 import { useAtom } from 'jotai';
 
-interface Point {
-    x: number;
-    y: number;
-}
-
 interface Range {
     x0: number;
     y0: number;
@@ -27,40 +36,6 @@ interface Range {
     y1: number;
 }
 
-interface Line {
-    x0: number;
-    y0: number;
-    x1: number;
-    y1: number;
-    stroke: string;
-}
-
-interface AddLineAction {
-    line: Line;
-}
-
-interface AddLinesAction {
-    addLines: Line[];
-}
-
-interface DeleteLinesAction {
-    deleteLines: Line[];
-}
-
-type Action = AddLineAction | AddLinesAction | DeleteLinesAction;
-
-function isAddLineAction(action: Action): action is AddLineAction {
-    return 'line' in action;
-}
-
-function isAddLinesAction(action: Action): action is AddLinesAction {
-    return 'addLines' in action;
-}
-
-function isDeleteLinesAction(action: Action): action is DeleteLinesAction {
-    return 'deleteLines' in action;
-}
-
 // https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection
 // https://stackoverflow.com/questions/9043805/test-if-two-lines-intersect-javascript-function
 function lineSegmentIntersection(l0: Range, l1: Range): boolean {
@@ -141,26 +116,6 @@ function useMouseInRange(range: Range): Point {
     return { x: mouse.x + range.x0, y: mouse.y + range.y0 };
 }
 
-function useKeyPress(
-    callback: (event: KeyboardEvent) => void,
-    key: string,
-    ctrlKey: boolean = false
-) {
-    useEffect(() => {
-        const listener = (eventRaw: Event) => {
-            // eslint-disable-next-line @typescript-eslint/no-explicit-any
-            const event = eventRaw as any as KeyboardEvent;
-            if (event.key === key && event.ctrlKey === ctrlKey) {
-                callback(event);
-            }
-        };
-        window.addEventListener('keydown', listener);
-        return () => {
-            window.removeEventListener('keydown', listener);
-        };
-    }, [callback, key, ctrlKey]);
-}
-
 const THICK_COLOR = '#313d49';
 const THIN_COLOR = '#1e2226';
 
@@ -200,12 +155,11 @@ const Grid: FC = () => {
         return lines_thin.concat(lines_thick);
     }, [range, GAP]);
 
-    const [userLines, setUserLines] = useState<Line[]>([]);
+    const [userLines, setUserLines] = useAtom(userLinesState);
+    const [userActions, setUserActions] = useAtom(userActionsState);
+    const [userRedoActions, setUserRedoActions] = useAtom(userRedoActionsState);
 
-    const [userActions, setUserActions] = useState<Action[]>([]);
-    const [userRedoActions, setUserRedoActions] = useState<Action[]>([]);
-
-    const [userStartPoint, setUserStartPoint] = useState<Point | null>(null);
+    const [userStartPoint, setUserStartPoint] = useAtom(userStartPointState);
     const [userLineColor, setUserLineColor] = useAtom(lineColorState);
     const [userDrawMode, setUserDrawMode] = useAtom(drawModeState);
 
@@ -309,93 +263,6 @@ const Grid: FC = () => {
         []
     );
 
-    // ctrl+z/ctrl+y for undo/redo
-    const onUndo = useCallback(() => {
-        if (!lodash.isNull(userStartPoint)) {
-            // if the user has a start point, just cancel the pending line
-            setUserStartPoint(null);
-            return;
-        }
-
-        const action = userActions[userActions.length - 1];
-        if (!action) return;
-
-        if (isAddLineAction(action)) {
-            // remove action.line
-            setUserLines(
-                userLines.filter((userLine) => userLine !== action.line)
-            );
-        } else if (isAddLinesAction(action)) {
-            // remove all of action.addLines
-            setUserLines(
-                userLines.filter(
-                    (userLine) =>
-                        !action.addLines.find(
-                            (actionLine) => actionLine === userLine
-                        )
-                )
-            );
-        } else if (isDeleteLinesAction(action)) {
-            // add back all of action.deleteLines
-            // NOTE: this does not preserve layering
-            setUserLines([...userLines, ...action.deleteLines]);
-        } else {
-            console.error('invalid action');
-        }
-        setUserActions(userActions.slice(0, -1));
-        setUserRedoActions([...userRedoActions, action]);
-    }, [userLines, userActions, userRedoActions, userStartPoint]);
-
-    const onRedo = useCallback(() => {
-        const action = userRedoActions[userRedoActions.length - 1];
-        if (!action) return;
-
-        if (isAddLineAction(action)) {
-            // add back action.line
-            setUserLines([...userLines, action.line]);
-        } else if (isAddLinesAction(action)) {
-            // add back all of action.addLines
-            // NOTE: this does not preserve layering
-            setUserLines([...userLines, ...action.addLines]);
-        } else if (isDeleteLinesAction(action)) {
-            // remove all of action.delteLines
-            setUserLines(
-                userLines.filter(
-                    (userLine) =>
-                        !action.deleteLines.find(
-                            (actionLine) => userLine === actionLine
-                        )
-                )
-            );
-        } else {
-            throw new Error('invalid action');
-        }
-        setUserRedoActions(userRedoActions.slice(0, -1));
-        setUserActions([...userActions, action]);
-    }, [userLines, userActions, userRedoActions]);
-
-    useKeyPress(onUndo, 'z', true);
-    useKeyPress(onRedo, 'y', true);
-
-    const setUserColorBind = useCallback(
-        (color: string) => {
-            setUserLineColor(color);
-            setUserDrawMode('line');
-        },
-        [setUserLineColor, setUserDrawMode]
-    );
-
-    useKeyPress(() => setUserColorBind(COLORS[0]!), '1');
-    useKeyPress(() => setUserColorBind(COLORS[1]!), '2');
-    useKeyPress(() => setUserColorBind(COLORS[2]!), '3');
-    useKeyPress(() => setUserColorBind(COLORS[3]!), '4');
-    useKeyPress(() => setUserColorBind(COLORS[4]!), '5');
-    useKeyPress(() => setUserColorBind(COLORS[5]!), '6');
-    useKeyPress(() => setUserColorBind(COLORS[6]!), '7');
-    useKeyPress(() => setUserColorBind(COLORS[7]!), '8');
-
-    useKeyPress(() => setUserDrawMode('trash'), 't');
-
     const gridLineElements = useMemo(
         () =>
             gridLines.map((line, idx) => (