First batch

src/ReactorMaintenance.Win2D/App.xaml

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+<Application
+    x:Class="ReactorMaintenance.Win2D.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+</Application>

src/ReactorMaintenance.Win2D/App.xaml.cs

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+using Microsoft.UI.Xaml;
+
+namespace ReactorMaintenance.Win2D;
+
+public partial class App : Application
+{
+    private Window? _window;
+
+    public App()
+    {
+        InitializeComponent();
+    }
+
+    protected override void OnLaunched(LaunchActivatedEventArgs args)
+    {
+        _window = new MainWindow();
+        _window.Activate();
+    }
+}

src/ReactorMaintenance.Win2D/MainWindow.xaml

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+<Window
+    x:Class="ReactorMaintenance.Win2D.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:canvas="using:Microsoft.Graphics.Canvas.UI.Xaml"
+    Title="Reactor Maintenance">
+
+    <Grid Background="#16191D">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <CommandBar Grid.Row="0" DefaultLabelPosition="Right" Background="#20252A">
+            <AppBarButton Icon="Add" Label="New" Click="New_Click" />
+            <AppBarButton Icon="OpenFile" Label="Open" Click="Open_Click" />
+            <AppBarButton Icon="Save" Label="Save" Click="Save_Click" />
+            <AppBarSeparator />
+            <AppBarButton Icon="Play" Label="Simulate" Click="Simulate_Click" />
+            <AppBarButton Icon="Accept" Label="Activate" Click="Activate_Click" />
+        </CommandBar>
+
+        <Grid Grid.Row="1" ColumnSpacing="0">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="220" />
+                <ColumnDefinition Width="*" />
+                <ColumnDefinition Width="300" />
+            </Grid.ColumnDefinitions>
+
+            <ScrollViewer Grid.Column="0" Background="#1C2126">
+                <StackPanel Padding="12" Spacing="10">
+                    <TextBlock Text="Tools" FontSize="18" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ComboBox x:Name="ToolPicker" SelectionChanged="ToolPicker_SelectionChanged" />
+                    <TextBlock Text="Brush applies to the selected cell." Foreground="#9EA7AE" TextWrapping="Wrap" />
+                    <TextBlock Text="Left click paints. Use Robot to set the start position." Foreground="#9EA7AE" TextWrapping="Wrap" />
+                </StackPanel>
+            </ScrollViewer>
+
+            <Grid Grid.Column="1" Background="#101215">
+                <canvas:CanvasControl
+                    x:Name="LevelCanvas"
+                    ClearColor="#101215"
+                    Draw="LevelCanvas_Draw"
+                    PointerPressed="LevelCanvas_PointerPressed"
+                    PointerMoved="LevelCanvas_PointerMoved"
+                    PointerReleased="LevelCanvas_PointerReleased" />
+            </Grid>
+
+            <ScrollViewer Grid.Column="2" Background="#1C2126">
+                <StackPanel Padding="14" Spacing="12">
+                    <TextBlock x:Name="LevelNameText" FontSize="20" FontWeight="SemiBold" Foreground="#F4F1E8" TextWrapping="Wrap" />
+                    <Grid ColumnSpacing="8">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="*" />
+                        </Grid.ColumnDefinitions>
+                        <StackPanel>
+                            <TextBlock Text="Turn" Foreground="#9EA7AE" />
+                            <TextBlock x:Name="TurnText" FontSize="22" Foreground="#F4F1E8" />
+                        </StackPanel>
+                        <StackPanel Grid.Column="1">
+                            <TextBlock Text="Status" Foreground="#9EA7AE" />
+                            <TextBlock x:Name="StatusText" FontSize="16" Foreground="#F4F1E8" TextWrapping="Wrap" />
+                        </StackPanel>
+                    </Grid>
+
+                    <TextBlock Text="Global Systems" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <TextBlock x:Name="GlobalText" Foreground="#CCD4DA" TextWrapping="Wrap" />
+
+                    <TextBlock Text="Selected Cell" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <TextBlock x:Name="CellText" Foreground="#CCD4DA" TextWrapping="Wrap" />
+
+                    <TextBlock Text="Forecasts" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="ForecastList">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Border BorderBrush="#46515A" BorderThickness="1" Padding="8" Margin="0,0,0,8" CornerRadius="3">
+                                    <TextBlock Text="{Binding Message}" Foreground="#F4F1E8" TextWrapping="Wrap" />
+                                </Border>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+    </Grid>
+</Window>

src/ReactorMaintenance.Win2D/MainWindow.xaml.cs

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+using System.Numerics;
+using Microsoft.Graphics.Canvas;
+using Microsoft.Graphics.Canvas.Text;
+using Microsoft.Graphics.Canvas.UI.Xaml;
+using Microsoft.UI;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Input;
+using ReactorMaintenance.Simulation;
+using Windows.Foundation;
+using Windows.Storage;
+using Windows.Storage.Pickers;
+using WinRT.Interop;
+
+namespace ReactorMaintenance.Win2D;
+
+public sealed partial class MainWindow : Window
+{
+    private readonly SimulationEngine _simulation = new();
+    private LevelState _level;
+    private EditorTool _selectedTool = EditorTool.Floor;
+    private GridPosition? _selectedCell;
+    private StorageFile? _currentFile;
+    private bool _painting;
+
+    public MainWindow()
+    {
+        InitializeComponent();
+
+        _level = BuildStarterLevel();
+        ToolPicker.ItemsSource = Enum.GetValues<EditorTool>();
+        ToolPicker.SelectedItem = _selectedTool;
+        RefreshInspector();
+    }
+
+    private void ToolPicker_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (ToolPicker.SelectedItem is EditorTool tool)
+        {
+            _selectedTool = tool;
+        }
+    }
+
+    private void New_Click(object sender, RoutedEventArgs e)
+    {
+        _level = BuildStarterLevel();
+        _currentFile = null;
+        _selectedCell = null;
+        RefreshInspector();
+        LevelCanvas.Invalidate();
+    }
+
+    private async void Open_Click(object sender, RoutedEventArgs e)
+    {
+        var picker = new FileOpenPicker();
+        InitializeWithWindow.Initialize(picker, WindowNative.GetWindowHandle(this));
+        picker.FileTypeFilter.Add(".json");
+
+        var file = await picker.PickSingleFileAsync();
+        if (file is null)
+        {
+            return;
+        }
+
+        var json = await FileIO.ReadTextAsync(file);
+        _level = LevelSerializer.Deserialize(json);
+        _level = _level with { Forecasts = _simulation.Forecast(_level) };
+        _currentFile = file;
+        _selectedCell = null;
+        RefreshInspector();
+        LevelCanvas.Invalidate();
+    }
+
+    private async void Save_Click(object sender, RoutedEventArgs e)
+    {
+        var file = _currentFile;
+        if (file is null)
+        {
+            var picker = new FileSavePicker();
+            InitializeWithWindow.Initialize(picker, WindowNative.GetWindowHandle(this));
+            picker.SuggestedFileName = _level.Name.Replace(' ', '-').ToLowerInvariant();
+            picker.FileTypeChoices.Add("Reactor level", new List<string> { ".json" });
+            file = await picker.PickSaveFileAsync();
+        }
+
+        if (file is null)
+        {
+            return;
+        }
+
+        await FileIO.WriteTextAsync(file, LevelSerializer.Serialize(_level));
+        _currentFile = file;
+    }
+
+    private void Simulate_Click(object sender, RoutedEventArgs e)
+    {
+        _level = _simulation.AdvanceTurn(_level);
+        RefreshInspector();
+        LevelCanvas.Invalidate();
+    }
+
+    private void Activate_Click(object sender, RoutedEventArgs e)
+    {
+        _level = _simulation.ActivateReactor(_level);
+        RefreshInspector();
+        LevelCanvas.Invalidate();
+    }
+
+    private void LevelCanvas_PointerPressed(object sender, PointerRoutedEventArgs e)
+    {
+        _painting = true;
+        LevelCanvas.CapturePointer(e.Pointer);
+        PaintAt(e.GetCurrentPoint(LevelCanvas).Position);
+    }
+
+    private void LevelCanvas_PointerMoved(object sender, PointerRoutedEventArgs e)
+    {
+        if (_painting)
+        {
+            PaintAt(e.GetCurrentPoint(LevelCanvas).Position);
+        }
+    }
+
+    private void LevelCanvas_PointerReleased(object sender, PointerRoutedEventArgs e)
+    {
+        _painting = false;
+        LevelCanvas.ReleasePointerCapture(e.Pointer);
+    }
+
+    private void PaintAt(Point point)
+    {
+        if (!TryGetGridPosition(point, out var position))
+        {
+            return;
+        }
+
+        _selectedCell = position;
+        _level = LevelEditor.Apply(_level, position, _selectedTool);
+        _level = _level with { Forecasts = _simulation.Forecast(_level) };
+        RefreshInspector();
+        LevelCanvas.Invalidate();
+    }
+
+    private void LevelCanvas_Draw(CanvasControl sender, CanvasDrawEventArgs args)
+    {
+        var drawing = args.DrawingSession;
+        var layout = GetLayout();
+
+        drawing.Clear(ColorHelper.FromArgb(255, 16, 18, 21));
+        DrawCells(drawing, layout);
+        DrawGrid(drawing, layout);
+        DrawRobot(drawing, layout);
+    }
+
+    private void DrawCells(CanvasDrawingSession drawing, CanvasLayout layout)
+    {
+        for (var y = 0; y < _level.Height; y++)
+        {
+            for (var x = 0; x < _level.Width; x++)
+            {
+                var position = new GridPosition(x, y);
+                var cell = _level.GetCell(position);
+                var rect = layout.CellRect(x, y);
+
+                drawing.FillRectangle(rect, CellColor(cell));
+
+                if (cell.HasPipe)
+                {
+                    var center = new Vector2((float)(rect.X + rect.Width / 2), (float)(rect.Y + rect.Height / 2));
+                    var pipeColor = cell.Pipe switch
+                    {
+                        PipeMedium.Coolant => Colors.DeepSkyBlue,
+                        PipeMedium.Fuel => Colors.Goldenrod,
+                        PipeMedium.Pressure => Colors.LightSteelBlue,
+                        _ => Colors.Transparent
+                    };
+                    drawing.DrawLine(new Vector2((float)rect.X + 6, center.Y), new Vector2((float)(rect.X + rect.Width - 6), center.Y), pipeColor, Math.Max(3, (float)rect.Width / 7));
+                    drawing.DrawLine(new Vector2(center.X, (float)rect.Y + 6), new Vector2(center.X, (float)(rect.Y + rect.Height - 6)), pipeColor, Math.Max(3, (float)rect.Width / 7));
+                }
+
+                if (cell.LeakRate > 0)
+                {
+                    drawing.DrawCircle(new Vector2((float)(rect.X + rect.Width - 10), (float)(rect.Y + 10)), 5, Colors.OrangeRed, 2);
+                }
+
+                if (cell.Hazards.Fire)
+                {
+                    drawing.FillCircle(new Vector2((float)(rect.X + rect.Width * 0.5), (float)(rect.Y + rect.Height * 0.5)), (float)rect.Width * 0.24f, Colors.OrangeRed);
+                }
+
+                if (_selectedCell == position)
+                {
+                    drawing.DrawRectangle(rect, Colors.White, 3);
+                }
+
+                DrawCellGlyph(drawing, cell, rect);
+            }
+        }
+    }
+
+    private void DrawCellGlyph(CanvasDrawingSession drawing, CellState cell, Rect rect)
+    {
+        var text = cell.Kind switch
+        {
+            CellKind.Reactor => "R",
+            CellKind.CoolingPump => "C",
+            CellKind.Generator => "G",
+            CellKind.PressureRegulator => "P",
+            CellKind.DiagnosticTerminal => "D",
+            CellKind.ControlTerminal => "T",
+            _ => string.Empty
+        };
+
+        if (string.IsNullOrEmpty(text))
+        {
+            return;
+        }
+
+        using var format = new CanvasTextFormat
+        {
+            FontSize = Math.Max(14, (float)rect.Width * 0.42f),
+            HorizontalAlignment = CanvasHorizontalAlignment.Center,
+            VerticalAlignment = CanvasVerticalAlignment.Center
+        };
+
+        drawing.DrawText(text, rect, Colors.White, format);
+    }
+
+    private void DrawGrid(CanvasDrawingSession drawing, CanvasLayout layout)
+    {
+        for (var x = 0; x <= _level.Width; x++)
+        {
+            var xPos = (float)(layout.OriginX + x * layout.CellSize);
+            drawing.DrawLine(xPos, (float)layout.OriginY, xPos, (float)(layout.OriginY + _level.Height * layout.CellSize), ColorHelper.FromArgb(120, 91, 104, 115), 1);
+        }
+
+        for (var y = 0; y <= _level.Height; y++)
+        {
+            var yPos = (float)(layout.OriginY + y * layout.CellSize);
+            drawing.DrawLine((float)layout.OriginX, yPos, (float)(layout.OriginX + _level.Width * layout.CellSize), yPos, ColorHelper.FromArgb(120, 91, 104, 115), 1);
+        }
+    }
+
+    private void DrawRobot(CanvasDrawingSession drawing, CanvasLayout layout)
+    {
+        var rect = layout.CellRect(_level.Robot.X, _level.Robot.Y);
+        var center = new Vector2((float)(rect.X + rect.Width / 2), (float)(rect.Y + rect.Height / 2));
+        drawing.FillCircle(center, (float)rect.Width * 0.28f, Colors.White);
+        drawing.DrawCircle(center, (float)rect.Width * 0.28f, Colors.Black, 2);
+    }
+
+    private bool TryGetGridPosition(Point point, out GridPosition position)
+    {
+        var layout = GetLayout();
+        var x = (int)((point.X - layout.OriginX) / layout.CellSize);
+        var y = (int)((point.Y - layout.OriginY) / layout.CellSize);
+        position = new GridPosition(x, y);
+        return _level.InBounds(position);
+    }
+
+    private CanvasLayout GetLayout()
+    {
+        var availableWidth = Math.Max(1, LevelCanvas.ActualWidth);
+        var availableHeight = Math.Max(1, LevelCanvas.ActualHeight);
+        var size = Math.Floor(Math.Min(availableWidth / _level.Width, availableHeight / _level.Height));
+        size = Math.Max(20, size);
+        var originX = Math.Max(0, (availableWidth - size * _level.Width) / 2);
+        var originY = Math.Max(0, (availableHeight - size * _level.Height) / 2);
+        return new CanvasLayout(size, originX, originY);
+    }
+
+    private static Windows.UI.Color CellColor(CellState cell)
+    {
+        if (cell.Kind == CellKind.Wall)
+        {
+            return ColorHelper.FromArgb(255, 54, 61, 68);
+        }
+
+        if (cell.Hazards.Fire)
+        {
+            return ColorHelper.FromArgb(255, 91, 39, 30);
+        }
+
+        return cell.Kind switch
+        {
+            CellKind.Reactor => ColorHelper.FromArgb(255, 61, 76, 82),
+            CellKind.CoolingPump => ColorHelper.FromArgb(255, 25, 79, 96),
+            CellKind.Generator => ColorHelper.FromArgb(255, 86, 75, 35),
+            CellKind.PressureRegulator => ColorHelper.FromArgb(255, 70, 78, 98),
+            CellKind.DiagnosticTerminal => ColorHelper.FromArgb(255, 39, 84, 62),
+            CellKind.ControlTerminal => ColorHelper.FromArgb(255, 80, 61, 91),
+            _ => ColorHelper.FromArgb(255, 31, 36, 40)
+        };
+    }
+
+    private void RefreshInspector()
+    {
+        LevelNameText.Text = _level.Name;
+        TurnText.Text = _level.Global.Turn.ToString();
+        StatusText.Text = _level.Global.Status;
+        GlobalText.Text =
+            $"Power: {_level.Global.Power}/10\n" +
+            $"Cooling: {_level.Global.Cooling}/10\n" +
+            $"Core Heat: {_level.Global.CoreHeat}/10\n" +
+            $"Facility Stability: {_level.Global.FacilityStability}/10";
+
+        if (_selectedCell is { } position && _level.InBounds(position))
+        {
+            var cell = _level.GetCell(position);
+            CellText.Text =
+                $"Position: {position.X},{position.Y}\n" +
+                $"Kind: {cell.Kind}\n" +
+                $"Pipe: {cell.Pipe}\n" +
+                $"Flow: {cell.Flow}, Pressure: {cell.Pressure}\n" +
+                $"Integrity: {cell.Integrity}, Leak: {cell.LeakRate}\n" +
+                $"Heat: {cell.Hazards.Heat}, Smoke: {cell.Hazards.Smoke}\n" +
+                $"Fuel Vapor: {cell.Hazards.FuelVapor}, Fuel: {cell.Hazards.LiquidFuel}\n" +
+                $"Coolant: {cell.Hazards.CoolantPooling}, Charge: {cell.Hazards.ElectricalCharge}";
+        }
+        else
+        {
+            CellText.Text = "No cell selected.";
+        }
+
+        ForecastList.ItemsSource = _level.Forecasts;
+    }
+
+    private static LevelState BuildStarterLevel()
+    {
+        var level = LevelState.Create("Cooling Sector B", 16, 12);
+        level = level.SetCell(new GridPosition(3, 5), new CellState { Kind = CellKind.CoolingPump, Pipe = PipeMedium.Coolant, Flow = 5, Pressure = 5, Powered = true });
+        level = level.SetCell(new GridPosition(4, 5), new CellState { Pipe = PipeMedium.Coolant, Flow = 5, Pressure = 7 });
+        level = level.SetCell(new GridPosition(5, 5), new CellState { Pipe = PipeMedium.Coolant, Flow = 3, Pressure = 8, LeakRate = 2, Integrity = 4 });
+        level = level.SetCell(new GridPosition(6, 5), new CellState { Pipe = PipeMedium.Coolant, Flow = 3, Pressure = 7 });
+        level = level.SetCell(new GridPosition(8, 5), new CellState { Kind = CellKind.Reactor, Hazards = new HazardState { Heat = 6, Stability = 8 } });
+        level = level.SetCell(new GridPosition(2, 8), new CellState { Kind = CellKind.Generator, Pipe = PipeMedium.Fuel, Flow = 4, Pressure = 6, Powered = true });
+        level = level.SetCell(new GridPosition(11, 4), new CellState { Kind = CellKind.DiagnosticTerminal, Powered = true });
+        level = level.SetCell(new GridPosition(12, 8), new CellState { Kind = CellKind.ControlTerminal, Powered = true });
+        return level with { Forecasts = new SimulationEngine().Forecast(level) };
+    }
+
+    private sealed record CanvasLayout(double CellSize, double OriginX, double OriginY)
+    {
+        public Rect CellRect(int x, int y) =>
+            new(OriginX + x * CellSize, OriginY + y * CellSize, CellSize, CellSize);
+    }
+}

src/ReactorMaintenance.Win2D/ReactorMaintenance.Win2D.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>ReactorMaintenance.Win2D</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;arm64</Platforms>
+    <RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+    <UseWinUI>true</UseWinUI>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <WindowsPackageType>None</WindowsPackageType>
+    <WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Graphics.Win2D" Version="1.4.0" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.28000.1839" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.8.260317003" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ReactorMaintenance.Simulation\ReactorMaintenance.Simulation.csproj" />
+  </ItemGroup>
+</Project>

src/ReactorMaintenance.Win2D/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="ReactorMaintenance.Win2D.app"/>
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>