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type { CanvasState, Layer } from '../../shared/types.ts';\n\nexport function createEmptyCanvas(width: number, height: number): CanvasState {\n const backgroundLayer: Layer = {\n id: 'background',\n name: 'Background',\n visible: true,\n opacity: 1,\n pixels: new Map(),\n };\n\n const layer1: Layer = {\n id: 'layer1',\n name: 'Layer 1',\n visible: true,\n opacity: 1,\n pixels: new Map(),\n };\n\n return {\n width,\n height,\n layers: [backgroundLayer, layer1],\n activeLayerId: 'layer1',\n history: [{\n layers: [backgroundLayer, layer1],\n activeLayerId: 'layer1',\n }],\n historyIndex: 0,\n };\n}\n\nexport function getPixelKey(x: number, y: number): string {\n return `${x},${y}`;\n}\n\nexport function getActiveLayer(canvas: CanvasState): Layer | undefined {\n return canvas.layers.find(layer => layer.id === canvas.activeLayerId);\n}\n\nexport function getAllVisiblePixels(canvas: CanvasState): Map {\n const allPixels = new Map();\n \n // Render layers from bottom to top\n for (const layer of canvas.layers) {\n if (!layer.visible) continue;\n \n for (const [key, color] of layer.pixels) {\n if (layer.opacity < 1) {\n // Simple opacity handling - in a real app you'd blend colors properly\n allPixels.set(key, color);\n } else {\n allPixels.set(key, color);\n }\n }\n }\n \n return allPixels;\n}\n\nexport function setPixel(canvas: CanvasState, x: number, y: number, color: string): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n const newPixels = new Map(layer.pixels);\n const key = getPixelKey(x, y);\n \n if (color === 'transparent' || color === '') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, color);\n }\n\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function floodFill(canvas: CanvasState, startX: number, startY: number, newColor: string): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const startKey = getPixelKey(startX, startY);\n const originalColor = activeLayer.pixels.get(startKey) || 'transparent';\n \n if (originalColor === newColor) return canvas;\n\n const newPixels = new Map(activeLayer.pixels);\n const stack: [number, number][] = [[startX, startY]];\n const visited = new Set();\n\n while (stack.length > 0) {\n const [x, y] = stack.pop()!;\n const key = getPixelKey(x, y);\n\n if (visited.has(key) || x < 0 || x >= canvas.width || y < 0 || y >= canvas.height) {\n continue;\n }\n\n const currentColor = newPixels.get(key) || 'transparent';\n if (currentColor !== originalColor) {\n continue;\n }\n\n visited.add(key);\n \n if (newColor === 'transparent') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, newColor);\n }\n\n // Add adjacent pixels to stack\n stack.push([x + 1, y], [x - 1, y], [x, y + 1], [x, y - 1]);\n }\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function undo(canvas: CanvasState): CanvasState {\n if (canvas.historyIndex > 0) {\n const newIndex = canvas.historyIndex - 1;\n const historyState = canvas.history[newIndex];\n return {\n ...canvas,\n layers: historyState.layers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: historyState.activeLayerId,\n historyIndex: newIndex,\n };\n }\n return canvas;\n}\n\nexport function redo(canvas: CanvasState): CanvasState {\n if (canvas.historyIndex < canvas.history.length - 1) {\n const newIndex = canvas.historyIndex + 1;\n const historyState = canvas.history[newIndex];\n return {\n ...canvas,\n layers: historyState.layers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: historyState.activeLayerId,\n historyIndex: newIndex,\n };\n }\n return canvas;\n}\n\nexport function clearCanvas(canvas: CanvasState): CanvasState {\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: new Map() };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function resizeCanvas(canvas: CanvasState, newWidth: number, newHeight: number): CanvasState {\n const newLayers = canvas.layers.map(layer => {\n const newPixels = new Map();\n \n // Copy existing pixels that fit in the new size\n for (const [key, color] of layer.pixels) {\n const [x, y] = key.split(',').map(Number);\n if (x < newWidth && y < newHeight) {\n newPixels.set(key, color);\n }\n }\n\n return { ...layer, pixels: newPixels };\n });\n\n return {\n width: newWidth,\n height: newHeight,\n layers: newLayers,\n activeLayerId: canvas.activeLayerId,\n history: [{\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n }],\n historyIndex: 0,\n };\n}\n\nexport function addLayer(canvas: CanvasState, name: string): CanvasState {\n const newLayer: Layer = {\n id: `layer_${Date.now()}`,\n name,\n visible: true,\n opacity: 1,\n pixels: new Map(),\n };\n\n const newLayers = [...canvas.layers, newLayer];\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: newLayer.id,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n activeLayerId: newLayer.id,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function deleteLayer(canvas: CanvasState, layerId: string): CanvasState {\n if (canvas.layers.length <= 1) return canvas; // Don't delete the last layer\n\n const newLayers = canvas.layers.filter(layer => layer.id !== layerId);\n let newActiveLayerId = canvas.activeLayerId;\n\n // If we deleted the active layer, switch to another one\n if (layerId === canvas.activeLayerId) {\n newActiveLayerId = newLayers[newLayers.length - 1].id;\n }\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: newActiveLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n activeLayerId: newActiveLayerId,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function setActiveLayer(canvas: CanvasState, layerId: string): CanvasState {\n return {\n ...canvas,\n activeLayerId: layerId,\n };\n}\n\nexport function toggleLayerVisibility(canvas: CanvasState, layerId: string): CanvasState {\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === layerId) {\n return { ...layer, visible: !layer.visible };\n }\n return layer;\n });\n\n return {\n ...canvas,\n layers: newLayers,\n };\n}\n\nexport function setLayerOpacity(canvas: CanvasState, layerId: string, opacity: number): CanvasState {\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === layerId) {\n return { ...layer, opacity: Math.max(0, Math.min(1, opacity)) };\n }\n return layer;\n });\n\n return {\n ...canvas,\n layers: newLayers,\n };\n}\n\n// Drawing functions that work with the active layer\nexport function drawLine(canvas: CanvasState, x0: number, y0: number, x1: number, y1: number, color: string): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const newPixels = new Map(activeLayer.pixels);\n \n // Bresenham's line algorithm\n const dx = Math.abs(x1 - x0);\n const dy = Math.abs(y1 - y0);\n const sx = x0 < x1 ? 1 : -1;\n const sy = y0 < y1 ? 1 : -1;\n let err = dx - dy;\n\n let x = x0;\n let y = y0;\n\n while (true) {\n if (x >= 0 && x < canvas.width && y >= 0 && y < canvas.height) {\n const key = getPixelKey(x, y);\n if (color === 'transparent') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, color);\n }\n }\n\n if (x === x1 && y === y1) break;\n \n const e2 = 2 * err;\n if (e2 > -dy) {\n err -= dy;\n x += sx;\n }\n if (e2 < dx) {\n err += dx;\n y += sy;\n }\n }\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function drawRectangle(canvas: CanvasState, x0: number, y0: number, x1: number, y1: number, color: string, filled: boolean = false): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const newPixels = new Map(activeLayer.pixels);\n \n const minX = Math.min(x0, x1);\n const maxX = Math.max(x0, x1);\n const minY = Math.min(y0, y1);\n const maxY = Math.max(y0, y1);\n\n for (let y = minY; y <= maxY; y++) {\n for (let x = minX; x <= maxX; x++) {\n if (x >= 0 && x < canvas.width && y >= 0 && y < canvas.height) {\n const isEdge = x === minX || x === maxX || y === minY || y === maxY;\n \n if (filled || isEdge) {\n const key = getPixelKey(x, y);\n if (color === 'transparent') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, color);\n }\n }\n }\n }\n }\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function drawCircle(canvas: CanvasState, centerX: number, centerY: number, radius: number, color: string, filled: boolean = false): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const newPixels = new Map(activeLayer.pixels);\n \n for (let y = centerY - radius; y <= centerY + radius; y++) {\n for (let x = centerX - radius; x <= centerX + radius; x++) {\n if (x >= 0 && x < canvas.width && y >= 0 && y < canvas.height) {\n const distance = Math.sqrt((x - centerX) ** 2 + (y - centerY) ** 2);\n \n if (filled ? distance <= radius : Math.abs(distance - radius) < 0.5) {\n const key = getPixelKey(x, y);\n if (color === 'transparent') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, color);\n }\n }\n }\n }\n }\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}\n\nexport function drawBrush(canvas: CanvasState, x: number, y: number, size: number, color: string): CanvasState {\n const activeLayer = getActiveLayer(canvas);\n if (!activeLayer) return canvas;\n\n const newPixels = new Map(activeLayer.pixels);\n const radius = Math.floor(size / 2);\n \n for (let dy = -radius; dy <= radius; dy++) {\n for (let dx = -radius; dx <= radius; dx++) {\n const px = x + dx;\n const py = y + dy;\n \n if (px >= 0 && px < canvas.width && py >= 0 && py < canvas.height) {\n const distance = Math.sqrt(dx * dx + dy * dy);\n if (distance <= radius) {\n const key = getPixelKey(px, py);\n if (color === 'transparent') {\n newPixels.delete(key);\n } else {\n newPixels.set(key, color);\n }\n }\n }\n }\n }\n\n const newLayers = canvas.layers.map(layer => {\n if (layer.id === canvas.activeLayerId) {\n return { ...layer, pixels: newPixels };\n }\n return layer;\n });\n\n const newHistory = canvas.history.slice(0, canvas.historyIndex + 1);\n newHistory.push({\n layers: newLayers.map(layer => ({ ...layer, pixels: new Map(layer.pixels) })),\n activeLayerId: canvas.activeLayerId,\n });\n\n return {\n ...canvas,\n layers: newLayers,\n history: newHistory,\n historyIndex: newHistory.length - 1,\n };\n}","deleted","label",[170,171,153],"frontend","utils","permalink","https://www.val.town/x/amadesclaire/pixelart/code/frontend/utils/canvas.ts","extension","actionData","errors"]