97 lines
3.3 KiB
Swift
97 lines
3.3 KiB
Swift
//
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// BoardRenderImage.swift
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// LifeGameApp (iOS)
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//
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// Created by Yusuke Hosonuma on 2020/08/14.
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//
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import SwiftUI
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import LifeGame
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private let gridLineWidth: CGFloat = 1.5 // `1.0`だと 128 x 128 で一部の線が描画されない
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public struct BoardRenderImage: View {
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private let board: Board<Cell>
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private let scale: CGFloat
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private let cellColor: Color
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public init(board: Board<Cell>, cellRenderSize: Int, cellColor: Color) {
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self.board = board
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self.scale = CGFloat(cellRenderSize)
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self.cellColor = cellColor
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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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// Note:
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// ライフゲームの性質上、空白のセルは多めになるので、その分だけ走査コストを減らすことができる。
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// （ただしその為には内部のデータ構造を見直す必要がある）
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//
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// しかし、パフォーマンス上のボトルネックがここなのか判断がつかないので、
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// Instruments でパフォーマンスを計測してから対応したほうがよさそう。
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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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if cell == .alive {
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let x = CGFloat(index % board.size) * scale + gridLineWidth
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let y = CGFloat(index / board.size) * scale + gridLineWidth
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context.fill(
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Path(CGRect(
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origin: CGPoint(x: x, y: y),
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size: CGSize(width: scale - gridLineWidth, height: scale - gridLineWidth))
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),
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with: .color(cellColor)
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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 i in 0...board.size + 1 {
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let index = CGFloat(i)
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let length = CGFloat(board.size) * scale + gridLineWidth
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// Vertical lines
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context.fill(
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Path(CGRect(x: scale * index, y: 0, width: gridLineWidth, 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: gridLineWidth)),
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with: .color(.gridLine)
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)
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}
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}
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}
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}
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struct BoardRender_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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BoardRenderImage(
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board: preset.board.board,
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cellRenderSize: 10,
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cellColor: colorScheme == .dark ? .white : .black
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)
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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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