MartinZikmund

private readonly List<Image> _cells = new List<Image>();

private void PrepareGrid()
{
    GameCanvas.Children.Clear();

    for (var row = 0; row < _gameState.Size; row++)
    {
        for (var column = 0; column < _gameState.Size; column++)
        {

MartinZikmund

private GameState _gameState;

private void StartNewGame()
{
    var boardSize = (int)BoardSizeNumberBox.Value;
    if (_gameState?.Size != boardSize)
    {
        _gameState = new GameState(boardSize);        
        PrepareGrid();
        LayoutGameBoard();

MartinZikmund

<Page
    ...
    xmlns:controls="using:Microsoft.UI.Xaml.Controls">

    <Grid
        Padding="12"
        Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
        RowSpacing="8">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />

MartinZikmund

<ComboBox
    x:Name="ThemeComboBox"
    Grid.Row="1"
    Grid.Column="1"
    HorizontalAlignment="Stretch"
    Header="Theme"
    ItemsSource="{x:Bind Themes}"
    SelectedItem="{x:Bind CurrentTheme, Mode=TwoWay}" />

MartinZikmund

private void UpdateBitmaps()
{
    _aliveBitmap = new BitmapImage(new Uri($"ms-appx:///Assets/{_currentTheme}_alive.png"));
    _deadBitmap = new BitmapImage(new Uri($"ms-appx:///Assets/{_currentTheme}_dead.png"));
}

MartinZikmund

private GameTheme _currentTheme = GameTheme.Classic;

public GameTheme[] Themes { get; } = new GameTheme[]
{
    GameTheme.Classic,
    GameTheme.Bacteria,
    GameTheme.CatMouse,
    GameTheme.FireWater
};

MartinZikmund

public enum GameTheme
{
    Classic,
    CatMouse,
    Bacteria,
    FireWater
}

MartinZikmund

var swap = Cells;
Cells = _nextGeneration;
_nextGeneration = swap;

MartinZikmund

private CellState[,] _nextGeneration = null;

public void Tick()
{
    _nextGeneration = _nextGeneration ?? new CellState[Size, Size];

    for (int row = 0; row < Size; row++)
    {
        for (int column = 0; column < Size; column++)
        {

MartinZikmund

private readonly Random _random = new Random();

public void Randomize()
{
    for (int row = 0; row < Size; row++)
    {
        for (int column = 0; column < Size; column++)
        {
            Cells[row, column] = (CellState)_random.Next(0, 2);
        }