Add a coordinate system and mouse tracking to the canvas

Adds X and Y axis labels to the canvas, displays mouse coordinates on hover, and updates the project documentation to reflect these new features.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 0385ea33-cde8-4bbd-8fce-8d192d30eb41
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/870d08ce-da3b-4822-9874-c2fe2b7628b1/0385ea33-cde8-4bbd-8fce-8d192d30eb41/zNDeQGA

client/src/components/canvas.tsx

@@ -24,6 +24,7 @@ export function Canvas({
   const containerRef = useRef<HTMLDivElement>(null);
   const [zoom, setZoom] = useState(1);
   const [pixelSize, setPixelSize] = useState(8);
+  const [mouseCoords, setMouseCoords] = useState<{x: number, y: number} | null>(null);
 
   // Create pixel map for O(1) lookup
   const pixelMap = new Map<string, string>();
@@ -36,6 +37,14 @@ export function Canvas({
     onPixelClick(x, y);
   };
 
+  const handlePixelMouseEnter = (x: number, y: number) => {
+    setMouseCoords({ x, y });
+  };
+
+  const handlePixelMouseLeave = () => {
+    setMouseCoords(null);
+  };
+
   const handleZoomIn = () => {
     setZoom(prev => Math.min(prev * 1.2, 3));
   };
@@ -67,11 +76,49 @@ export function Canvas({
         className="w-full h-full overflow-auto p-8"
         data-testid="canvas-container"
       >
-        <div 
-          className="grid mx-auto border border-gray-400 relative"
-          style={canvasStyle}
-          data-testid="pixel-canvas"
-        >
+        {/* Coordinate System Container */}
+        <div className="relative inline-block">
+          {/* Top X-axis coordinates */}
+          <div className="flex ml-8 mb-1">
+            {Array.from({ length: Math.ceil(canvasWidth / 10) }, (_, i) => (
+              <div
+                key={i}
+                className="text-xs text-gray-400 text-center"
+                style={{ 
+                  width: `${10 * pixelSize}px`,
+                  fontSize: `${Math.max(8, pixelSize * 0.8)}px`
+                }}
+              >
+                {i * 10}
+              </div>
+            ))}
+          </div>
+
+          {/* Canvas with left Y-axis coordinates */}
+          <div className="flex">
+            {/* Left Y-axis coordinates */}
+            <div className="flex flex-col mr-1">
+              {Array.from({ length: Math.ceil(canvasHeight / 10) }, (_, i) => (
+                <div
+                  key={i}
+                  className="text-xs text-gray-400 flex items-center justify-end"
+                  style={{ 
+                    height: `${10 * pixelSize}px`,
+                    width: '24px',
+                    fontSize: `${Math.max(8, pixelSize * 0.8)}px`
+                  }}
+                >
+                  {i * 10}
+                </div>
+              ))}
+            </div>
+
+            {/* Main Canvas */}
+            <div 
+              className="grid border border-gray-400 relative"
+              style={canvasStyle}
+              data-testid="pixel-canvas"
+            >
           {Array.from({ length: canvasHeight }, (_, y) =>
             Array.from({ length: canvasWidth }, (_, x) => {
               const pixelColor = pixelMap.get(`${x},${y}`) || "#FFFFFF";
@@ -88,6 +135,8 @@ export function Canvas({
                     height: `${pixelSize}px`
                   }}
                   onClick={() => handlePixelClick(x, y)}
+                  onMouseEnter={() => handlePixelMouseEnter(x, y)}
+                  onMouseLeave={handlePixelMouseLeave}
                   data-testid={`pixel-${x}-${y}`}
                   data-x={x}
                   data-y={y}
@@ -95,9 +144,26 @@ export function Canvas({
               );
             })
           )}
+            </div>
+          </div>
         </div>
       </div>
 
+      {/* Coordinate Info Display */}
+      <div className="absolute top-4 left-4 bg-panel-bg px-3 py-2 rounded-lg border border-gray-600">
+        <div className="text-sm text-gray-300">
+          Canvas: {canvasWidth} × {canvasHeight}
+        </div>
+        <div className="text-xs text-gray-400">
+          Zoom: {Math.round(zoom * 100)}%
+        </div>
+        {mouseCoords && (
+          <div className="text-xs text-green-400 mt-1">
+            Mouse: ({mouseCoords.x}, {mouseCoords.y})
+          </div>
+        )}
+      </div>
+
       {/* Zoom Controls */}
       <div className="absolute bottom-4 right-4 flex flex-col space-y-2">
         <button 

exports/canvas-2025-08-18T12-27-25-417Z.svg

@@ -0,0 +1 @@
+<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100%" height="100%" fill="#FFFFFF"/><rect x="64" y="7" width="1" height="1" fill="#be0039"/><rect x="65" y="7" width="1" height="1" fill="#00ccc0"/></svg>

replit.md

@@ -45,10 +45,12 @@ Language: German (Deutsch) - User communicates in German and prefers responses i
 
 **User Experience Features**
 - Interactive canvas with zoom and pan capabilities
-- Color palette with 16 predefined colors
+- Official r/place 2022 color palette with 32 authentic colors arranged in 8x4 grid
+- Coordinate system with X/Y axis labels showing every 10th position
+- Real-time mouse coordinate tracking and display
 - Cooldown system to prevent pixel spam
 - Recent placements tracking and display
-- Grid overlay toggle for precise pixel placement
+- Canvas size and zoom level information display
 - Toast notifications for user feedback
 
 ## External Dependencies