Fixed draw function by wrapping it with usecallback

src/components/BuildingPlan.tsx

@@ -1,22 +1,42 @@
+import { useCallback, useEffect, useState } from "react";
 import { useRoomContext } from "../context";
 import { Canvas } from "./Canvas";
 
 export type BuildingPlanProps = { width: number; height: number };
 
 export const BuildingPlan = ({ width, height }: BuildingPlanProps) => {
-  const { state } = useRoomContext();
+  const { state, setState } = useRoomContext();
+
+  const draw = useCallback(
+    (ctx: CanvasRenderingContext2D) => {
+      state.map.map(({ coordinates, size }, index) => {
+        const { free } = state.char[index];
+        ctx.fillStyle = free ? "green" : "gray";
+        ctx.fillRect(coordinates.x, coordinates.y, size.w, size.h);
+      });
+    },
+    [state.char, state.map]
+  );
+
+  useEffect(() => {
+    setTimeout(
+      () =>
+        setState((p) => ({
+          ...p,
+          char: [
+            { free: false },
+            { free: false },
+            { free: false },
+            { free: false },
+          ],
+        })),
+      1000
+    );
+  }, []);
 
   return (
-    <Canvas
-      height={height}
-      width={width}
-      draw={(ctx) => {
-        state.map.map(({ coordinates, size }, index) => {
-          const { free } = state.char[index];
-          ctx.fillStyle = free ? "green" : "gray";
-          ctx.fillRect(coordinates.x, coordinates.y, size.w, size.h);
-        });
-      }}
-    />
+    <>
+      <Canvas height={height} width={width} draw={draw} />
+    </>
   );
 };