SnakeBoard.swift

struct SnakeBoard:View {
    func bodyAndTarget() -> [SnakeGame.Coordinate] {
        (game.target() != nil
            ? [ game.target()! ]
            : [])
        + game.snake().body
    }
    @StateObject var state:ViewState
    let pixelFactor:Double
    var game: SnakeGame.Game { state.game }
    var body:some View {
        Canvas { ctx, size in
            bodyAndTarget().forEach {
                let color =
                    coordinateToPoint($0) == coordinateToPoint(game.target() != nil ? game.target()! : (-1,-1))
                    ? Color.red : .white
                let path = Path(CGRect(origin:coordinateToPoint(($0.x * Int(pixelFactor), $0.y * Int(pixelFactor))), size:.init(width:pixelFactor, height:pixelFactor)))
                ctx.stroke(path, with:.color(color))
                ctx.fill  (path, with:.color(color))
            }
        }
        .background(Color(white: 0.1))
        .frame(width: Double(state.game.size().width) * pixelFactor, height: Double(state.game.size().height) * pixelFactor, alignment: .center)
    }
}