Draw Patterns

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}\n\n // Calculate which tile the mouse is over\n const tileWidth = TILE_WIDTH * UI_STATE.zoom;\n const tileHeight = TILE_HEIGHT * UI_STATE.zoom;\n\n const tileIndexX = Math.floor((clientX - rect.left) / tileWidth);\n const tileIndexY = Math.floor((clientY - rect.top) / tileHeight);\n\n // Coordinates relative to the layer\n const layerX = clientX / UI_STATE.zoom - TILE_WIDTH * tileIndexX;\n const layerY = clientY / UI_STATE.zoom - TILE_HEIGHT * tileIndexY;\n\n // Check if the coordinates are within the special tile\n const isWithinSpecialTile = tileIndexX === specialTileX\n && tileIndexY === specialTileY\n && layerX >= 0\n && layerX < TILE_WIDTH\n && layerY >= 0\n && layerY < TILE_HEIGHT;\n\n return {\n x: layerX,\n y: layerY,\n isWithinSpecialTile,\n };\n}\n\nfunction updateDisplay() {\n mainCtx.clearRect(0, 0, mainCtx.canvas.width, mainCtx.canvas.height);\n\n const tilesX = Math.ceil(mainCtx.canvas.width / (TILE_WIDTH * UI_STATE.zoom)) + 1;\n const tilesY = Math.ceil(mainCtx.canvas.height / (TILE_HEIGHT * UI_STATE.zoom)) + 1;\n\n for (let x = 0; x < tilesX; x++) {\n for (let y = 0; y < tilesY; y++) {\n const tileX = x * TILE_WIDTH * UI_STATE.zoom;\n const tileY = y * TILE_HEIGHT * UI_STATE.zoom;\n\n mainCtx.drawImage(\n layerCanvas,\n tileX,\n tileY,\n TILE_WIDTH * UI_STATE.zoom,\n TILE_HEIGHT * UI_STATE.zoom,\n );\n\n // Draw a red square only around the special tile\n if (x === specialTileX && y === specialTileY) {\n mainCtx.strokeStyle = \"violet\";\n mainCtx.lineWidth = 2;\n mainCtx.strokeRect(tileX, tileY, TILE_WIDTH * UI_STATE.zoom, TILE_HEIGHT * UI_STATE.zoom);\n }\n }\n }\n requestAnimationFrame(updateDisplay);\n}\n\nfunction startDrawing(e) {\n e.preventDefault(); // Prevent default touch behavior\n IS_DRAWING = true;\n const { x, y, isWithinSpecialTile } = getLayerCoords(e);\n if (isWithinSpecialTile) {\n // Draw a circle as soon as the brush stroke starts, so a click or tap will result in a circle\n layerCtx.beginPath();\n layerCtx.arc(x, y, UI_STATE.brushSize / 2, 0, Math.PI * 2);\n layerCtx.fillStyle = UI_STATE.brushColor;\n layerCtx.fill();\n\n // Begin a line as well.\n layerCtx.beginPath();\n layerCtx.moveTo(x, y);\n }\n}\n\nfunction stopDrawing(e) {\n e.preventDefault(); // Prevent default touch behavior\n IS_DRAWING = false;\n layerCtx.closePath();\n}\n\nfunction draw(e) {\n e.preventDefault(); // Prevent default touch behavior\n\n if (!IS_DRAWING) return;\n\n const { x, y, isWithinSpecialTile } = getLayerCoords(e);\n\n // Only draw if within the special tile area\n if (isWithinSpecialTile) {\n layerCtx.lineTo(x, y);\n layerCtx.strokeStyle = UI_STATE.brushColor;\n layerCtx.lineWidth = UI_STATE.brushSize;\n layerCtx.lineCap = \"round\";\n layerCtx.lineJoin = \"round\";\n layerCtx.stroke();\n }\n}\n\n// Add both mouse and touch event listeners\nmainCanvas.addEventListener(\"mousedown\", startDrawing);\nmainCanvas.addEventListener(\"mousemove\", draw);\nmainCanvas.addEventListener(\"mouseup\", 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