158 lines
5.3 KiB
Swift
158 lines
5.3 KiB
Swift
//
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// BoardThumbnailImage.swift
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// LifeGameApp (iOS)
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//
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// Created by Yusuke Hosonuma on 2020/08/09.
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//
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import SwiftUI
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import LifeGame
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//#if os(macOS)
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//private typealias XImage = NSImage
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//#else
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//private typealias XImage = UIImage
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//#endif
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//
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//private let cacheStorage = MemoryCacheStorage<XImage>()
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// TODO: 内部的に BoardRenderImage を利用するようにしたい。
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public struct BoardThumbnailImage: View {
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@Environment(\.colorScheme) var colorScheme
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@Environment(\.redactionReasons) var reasons
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private let board: Board<Cell>
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private let cellColor: Color?
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private let cacheKey: String?
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private let scale: Int
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public init(board: Board<Cell>, cellColor: Color? = nil, cacheKey: String? = nil) {
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self.board = board.extended(by: .die, count: 1)
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self.cellColor = cellColor
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self.cacheKey = cacheKey
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self.scale = max(2, 140 / board.size)
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}
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private var fillColor: Color {
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if let color = cellColor {
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return color
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} else {
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return colorScheme == .dark ? .white : .black
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}
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}
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public var body: some View {
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let renderWidth = CGFloat(board.size * scale + 1)
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if reasons.isEmpty == false {
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// TODO: 外枠だけレンダリングしたほうがいいような？
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Color.gray.opacity(0.3)
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.scaledToFit()
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} else {
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Canvas { context, size in
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context.scaleBy(x: size.width / renderWidth, y: size.height / renderWidth)
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//
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// Render cells.
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//
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for (index, cell) in board.cells.enumerated() {
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let x = (index % board.size) * scale
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let y = (index / board.size) * scale
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if cell == .alive {
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context.fill(
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Path(CGRect(origin: CGPoint(x: x, y: y), size: CGSize(width: scale, height: scale))),
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with: .color(fillColor)
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)
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}
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}
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//
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// Render grid.
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//
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for index in 0...board.size + 1 {
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let length = board.size * scale + 1
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// Vertical lines
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context.fill(
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Path(CGRect(x: scale * index, y: 0, width: 1, height: length)),
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with: .color(.gridLine)
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)
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// Horizontal lines
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context.fill(
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Path(CGRect(x: 0, y: scale * index, width: length, height: 1)),
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with: .color(.gridLine)
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)
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}
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}
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.scaledToFit()
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}
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// TODO: いったん既存のキャッシュ処理は無効化（必要そうだったらまた考える）
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//
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// Image(image: thumbnailImage)
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// .antialiased(false)
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// .resizable()
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// .scaledToFit()
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}
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// private var thumbnailImage: XImage {
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// guard let cacheKey = cacheKey else {
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// return renderImage()
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// }
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//
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// let key = "\(cacheKey)-\(fillColor.hashValue)-\(gridColor.hashValue)"
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//
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// if let image = cacheStorage.value(forKey: key) {
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// return image
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// } else {
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// let image = renderImage()
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// cacheStorage.store(key: key, image: image)
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// return image
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// }
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// }
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//
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// private func renderImage() -> XImage {
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// let scale = max(2, 140 / board.size)
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// let size = CGSize(width: board.size * scale + 1, height: board.size * scale + 1)
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//
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// return GraphicsImageRenderer(size: size)
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// .image(actions: { context in
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// context.setFillColor(fillColor)
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//
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// for (index, cell) in board.cells.enumerated() {
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// let x = (index % board.size) * scale
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// let y = (index / board.size) * scale
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// if cell == .alive {
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// context.fill(CGRect(origin: CGPoint(x: x, y: y), size: CGSize(width: scale, height: scale)))
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// }
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// }
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//
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// // Draw grid
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// context.setFillColor(gridColor)
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// for index in 0...board.size + 1 {
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// let length = board.size * scale + 1
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// context.fill(CGRect(x: scale * index, y: 0, width: 1, height: length)) // vertical lines
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// context.fill(CGRect(x: 0, y: scale * index, width: length, height: 1)) // horizontal lines
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// }
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// })
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// }
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}
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struct BoardThumnailImage_Previews: PreviewProvider {
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static var previews: some View {
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view(preset: .nebura, colorScheme: .dark)
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view(preset: .nebura, colorScheme: .light)
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view(preset: .spaceShip, colorScheme: .dark)
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}
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static func view(preset: BoardPreset, colorScheme: ColorScheme) -> some View {
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BoardThumbnailImage(board: preset.board.board)
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.previewLayout(.fixed(width: 200.0, height: 200.0))
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.colorScheme(colorScheme)
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.preferredColorScheme(colorScheme)
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.padding()
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}
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}
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