package.json

@@ -24,7 +24,8 @@
     "react-dom": "^19.2.0",
     "react-konva": "^19.2.0",
     "react-tabs": "^6.1.0",
-    "react-use-websocket": "3.0.0"
+    "react-use-websocket": "3.0.0",
+    "sonner": "^2.0.7"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",

src/features/cameras/components/CameraGrid.tsx

@@ -8,20 +8,24 @@ const CameraGrid = () => {
   const [regions, setRegions] = useState<Region[]>([
     { name: "Region 1", brushColour: "#ff0000" },
     { name: "Region 2", brushColour: "#00ff00" },
+    { name: "Region 3", brushColour: "#0400ff" },
   ]);
   const [selectedRegionIndex, setSelectedRegionIndex] = useState(0);
+  const [isErasing, setErasing] = useState(false);
 
   const updateRegionColour = (index: number, newColour: string) => {
     setRegions((prev) => prev.map((r, i) => (i === index ? { ...r, brushColour: newColour } : r)));
   };
   return (
     <div className="grid grid-cols-1 md:grid-cols-2">
-      <VideoFeedGridPainter regions={regions} selectedRegionIndex={selectedRegionIndex} />
+      <VideoFeedGridPainter regions={regions} selectedRegionIndex={selectedRegionIndex} isErasing={isErasing} />
       <CameraSettings
         regions={regions}
         selectedRegionIndex={selectedRegionIndex}
         onSelectRegion={setSelectedRegionIndex}
         onChangeRegionColour={updateRegionColour}
+        isErasing={isErasing}
+        onSelectErasing={setErasing}
       />
     </div>
   );

src/features/cameras/components/CameraSettings.tsx

@@ -9,6 +9,8 @@ type CameraSettingsProps = {
   selectedRegionIndex: number;
   onSelectRegion: (index: number) => void;
   onChangeRegionColour: (index: number, colour: string) => void;
+  isErasing: boolean;
+  onSelectErasing: (isErasing: boolean) => void;
 };
 
 const CameraSettings = ({
@@ -16,9 +18,11 @@ const CameraSettings = ({
   selectedRegionIndex,
   onSelectRegion,
   onChangeRegionColour,
+  isErasing,
+  onSelectErasing,
 }: CameraSettingsProps) => {
   return (
-    <Card className="p-4 min-h-screen">
+    <Card className="p-4 min-h-screen w-[80%] place-self-end">
       <Tabs selectedTabClassName="bg-gray-300 text-gray-900 font-semibold border-none rounded-sm">
         <TabList>
           <Tab>Target Detection</Tab>
@@ -30,6 +34,8 @@ const CameraSettings = ({
             selectedRegionIndex={selectedRegionIndex}
             onSelectRegion={onSelectRegion}
             onChangeRegionColour={onChangeRegionColour}
+            isErasing={isErasing}
+            onSelectErasing={onSelectErasing}
           />
         </TabPanel>
         <TabPanel>

src/features/cameras/components/ColourPicker.tsx

@@ -4,7 +4,6 @@ type ColourPickerProps = {
 };
 
 const ColourPicker = ({ colour, setColour }: ColourPickerProps) => {
-  console.log(colour);
   return <input type="color" name="" id="" value={colour} onChange={(e) => setColour(e.target.value)} />;
 };
 

src/features/cameras/components/RegionSelector.tsx

@@ -1,4 +1,4 @@
-import ColourPicker from "./colourPicker";
+import ColourPicker from "./ColourPicker";
 import type { Region } from "../../../types/types";
 
 type RegionSelectorProps = {
@@ -6,6 +6,8 @@ type RegionSelectorProps = {
   selectedRegionIndex: number;
   onSelectRegion: (index: number) => void;
   onChangeRegionColour: (index: number, colour: string) => void;
+  isErasing: boolean;
+  onSelectErasing: (isErasing: boolean) => void;
 };
 
 const RegionSelector = ({
@@ -13,7 +15,13 @@ const RegionSelector = ({
   selectedRegionIndex,
   onSelectRegion,
   onChangeRegionColour,
+  isErasing,
+  onSelectErasing,
 }: RegionSelectorProps) => {
+  const handleChange = () => {
+    onSelectErasing(!isErasing);
+  };
+
   return (
     <div>
       <div>
@@ -29,6 +37,10 @@ const RegionSelector = ({
             <ColourPicker colour={region.brushColour} setColour={(c: string) => onChangeRegionColour(idx, c)} />
           </div>
         ))}
+        <label htmlFor="">
+          <input type="checkbox" onChange={handleChange} checked={isErasing} />
+          Eraser
+        </label>
       </div>
     </div>
   );

src/features/cameras/components/VideoFeedGridPainter.tsx

@@ -13,19 +13,26 @@ const gap = 0;
 type VideoFeedGridPainterProps = {
   regions: Region[];
   selectedRegionIndex: number;
+  isErasing: boolean;
 };
 
-const VideoFeedGridPainter = ({ regions, selectedRegionIndex }: VideoFeedGridPainterProps) => {
+type PaintedCell = {
+  colour: string;
+};
+
+const VideoFeedGridPainter = ({ regions, selectedRegionIndex, isErasing }: VideoFeedGridPainterProps) => {
   const { latestBitmapRef } = useCreateVideoSnapshot();
-
   const isDrawingRef = useRef(false);
-  const paintedCellsRef = useRef<Set<string>>(new Set());
+  const paintedCellsRef = useRef<Map<string, PaintedCell>>(new Map());
-
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const paintLayerRef = useRef<any>(null);
 
-  const draw = (bmp: RefObject<ImageBitmap | null>) => {
+  const draw = (bmp: RefObject<ImageBitmap | null>): ImageBitmap | null => {
-    if (!bmp || !bmp.current) return null;
+    if (!bmp || !bmp.current) {
-    return bmp.current;
+      return null;
+    }
+    const image = bmp.current;
+    return image;
   };
 
   const paintCell = (x: number, y: number) => {
@@ -34,17 +41,32 @@ const VideoFeedGridPainter = ({ regions, selectedRegionIndex }: VideoFeedGridPai
 
     if (row < 0 || row >= rows || col < 0 || col >= cols) return;
 
-    const key = `${row}-${col}`;
+    const activeRegion = regions[selectedRegionIndex];
-    const set = paintedCellsRef.current;
+    if (!activeRegion) return;
-    if (set.has(key)) return;
 
-    set.add(key);
+    const key = `${row}-${col}`;
+    const currentColour = regions[selectedRegionIndex].brushColour;
+
+    const map = paintedCellsRef.current;
+    const existing = map.get(key);
+
+    if (isErasing) {
+      if (map.has(key)) {
+        map.delete(key);
+        paintLayerRef.current?.batchDraw();
+      }
+      return;
+    }
+
+    if (existing && existing.colour === currentColour) return;
+
+    map.set(key, { colour: currentColour });
 
     paintLayerRef.current?.batchDraw();
   };
 
   const handleStageMouseDown = (e: KonvaEventObject<MouseEvent>) => {
-    if (!selectedRegionIndex) return;
+    if (!regions[selectedRegionIndex]) return;
     isDrawingRef.current = true;
     const pos = e.target.getStage()?.getPointerPosition();
     if (pos) paintCell(pos.x, pos.y);
@@ -52,7 +74,7 @@ const VideoFeedGridPainter = ({ regions, selectedRegionIndex }: VideoFeedGridPai
 
   const handleStageMouseMove = (e: KonvaEventObject<MouseEvent>) => {
     if (!isDrawingRef.current) return;
-    if (!selectedRegionIndex) return;
+    if (!regions[selectedRegionIndex]) return;
     const pos = e.target.getStage()?.getPointerPosition();
     if (pos) paintCell(pos.x, pos.y);
   };
@@ -79,7 +101,7 @@ const VideoFeedGridPainter = ({ regions, selectedRegionIndex }: VideoFeedGridPai
           <Shape
             sceneFunc={(ctx, shape) => {
               const cells = paintedCellsRef.current;
-              cells.forEach((key) => {
+              cells.forEach((cell, key) => {
                 const [rowStr, colStr] = key.split("-");
                 const row = Number(rowStr);
                 const col = Number(colStr);
@@ -89,7 +111,7 @@ const VideoFeedGridPainter = ({ regions, selectedRegionIndex }: VideoFeedGridPai
 
                 ctx.beginPath();
                 ctx.rect(x, y, size, size);
-                ctx.fillStyle = regions[selectedRegionIndex]?.brushColour;
+                ctx.fillStyle = cell.colour;
                 ctx.fill();
               });
 

src/routes/baywatch.tsx

@@ -1,5 +1,6 @@
 import { createFileRoute } from "@tanstack/react-router";
 import CameraGrid from "../features/cameras/components/CameraGrid";
+import { Toaster } from "sonner";
 
 export const Route = createFileRoute("/baywatch")({
   component: RouteComponent,
@@ -10,6 +11,7 @@ function RouteComponent() {
     <div>
       <h2 className="text-xl font-semibold">Cameras</h2>
       <CameraGrid />
+      <Toaster />
     </div>
   );
 }

yarn.lock

@@ -2240,6 +2240,11 @@ shebang-regex@^3.0.0:
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-3.0.0.tgz#ae16f1644d873ecad843b0307b143362d4c42172"
   integrity sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==
 
+sonner@^2.0.7:
+  version "2.0.7"
+  resolved "https://registry.yarnpkg.com/sonner/-/sonner-2.0.7.tgz#810c1487a67ec3370126e0f400dfb9edddc3e4f6"
+  integrity sha512-W6ZN4p58k8aDKA4XPcx2hpIQXBRAgyiWVkYhT7CvK6D3iAu7xjvVyhQHg2/iaKJZ1XVJ4r7XuwGL+WGEK37i9w==
+
 source-map-js@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.2.1.tgz#1ce5650fddd87abc099eda37dcff024c2667ae46"