Initial implementation of analog stick visualization.

src/Ryujinx/UI/ViewModels/Input/ControllerInputViewModel.cs

@@ -1,11 +1,28 @@
 using Avalonia.Svg.Skia;
+using Ryujinx.Ava.Input;
 using Ryujinx.Ava.UI.Models.Input;
 using Ryujinx.Ava.UI.Views.Input;
+using Ryujinx.Input;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace Ryujinx.Ava.UI.ViewModels.Input
 {
     public class ControllerInputViewModel : BaseModel
     {
+        private const int StickUiPollMs = 50; // Milliseconds per poll.
+        private const float CanvasCenterOffset = 75f/2f;
+        private const int StickScaleFactor = 30;
+
+        private IGamepad _selectedGamepad;
+        
+        // Offset from origin for UI stick visualization.
+        private (float, float) _uiStickLeft;
+        private (float, float) _uiStickRight;
+
+        internal CancellationTokenSource _pollTokenSource = new();
+        private CancellationToken _pollToken;
+
         private GamepadInputConfig _config;
         public GamepadInputConfig Config
         {
@@ -54,6 +71,39 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
             }
         }
 
+        public (float, float) UiStickLeft
+        {
+            get => (_uiStickLeft.Item1 * StickScaleFactor, _uiStickLeft.Item2 * StickScaleFactor);
+            set
+            {
+                _uiStickLeft = value;
+
+                OnPropertyChanged();
+                OnPropertyChanged(nameof(UiStickRightX));
+                OnPropertyChanged(nameof(UiStickRightY));
+            }
+        }
+        
+        public (float, float) UiStickRight
+        {
+            get => (_uiStickRight.Item1 * StickScaleFactor, _uiStickRight.Item2 * StickScaleFactor);
+            set
+            {
+                _uiStickRight = value;
+
+                OnPropertyChanged();
+                OnPropertyChanged(nameof(UiStickLeftX));
+                OnPropertyChanged(nameof(UiStickLeftY));
+            }
+        }
+
+        public float canvasCenter => CanvasCenterOffset;
+
+        public float UiStickLeftX => UiStickLeft.Item1 + CanvasCenterOffset;
+        public float UiStickLeftY => UiStickLeft.Item2 + CanvasCenterOffset;
+        public float UiStickRightX => UiStickRight.Item1 + CanvasCenterOffset;
+        public float UiStickRightY => UiStickRight.Item2 + CanvasCenterOffset;
+
         public readonly InputViewModel ParentModel;
 
         public ControllerInputViewModel(InputViewModel model, GamepadInputConfig config)
@@ -62,6 +112,11 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
             model.NotifyChangesEvent += OnParentModelChanged;
             OnParentModelChanged();
             Config = config;
+
+            _pollTokenSource = new();
+            _pollToken = _pollTokenSource.Token;
+
+            Task.Run(() => PollSticks(_pollToken));
         }
 
         public async void ShowMotionConfig()
@@ -74,6 +129,24 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
             await RumbleInputView.Show(this);
         }
 
+        private async Task PollSticks(CancellationToken token)
+        {
+            while (!token.IsCancellationRequested)
+            {
+                _selectedGamepad = ParentModel.SelectedGamepad;
+
+                if (_selectedGamepad != null && _selectedGamepad is not AvaloniaKeyboard)
+                {
+                    UiStickLeft = _selectedGamepad.GetStick(StickInputId.Left);
+                    UiStickRight = _selectedGamepad.GetStick(StickInputId.Right);
+                }
+
+                await Task.Delay(StickUiPollMs);
+            }
+
+            _pollTokenSource.Dispose();
+        }
+
         public void OnParentModelChanged()
         {
             IsLeft = ParentModel.IsLeft;

src/Ryujinx/UI/ViewModels/Input/InputViewModel.cs

@@ -879,6 +879,8 @@ namespace Ryujinx.Ava.UI.ViewModels.Input
             _mainWindow.InputManager.GamepadDriver.OnGamepadConnected -= HandleOnGamepadConnected;
             _mainWindow.InputManager.GamepadDriver.OnGamepadDisconnected -= HandleOnGamepadDisconnected;
 
+            (ConfigViewModel as ControllerInputViewModel)._pollTokenSource?.Cancel();
+
             _mainWindow.ViewModel.AppHost?.NpadManager.UnblockInputUpdates();
 
             SelectedGamepad?.Dispose();

src/Ryujinx/UI/Views/Input/ControllerInputView.axaml

@@ -318,12 +318,75 @@
                 HorizontalAlignment="Stretch"
                 VerticalAlignment="Stretch">
                 <!-- Controller Picture -->
-                <Image
+                 <Border
+                    BorderBrush="{DynamicResource ThemeControlBorderColor}"
+                    BorderThickness="1"
+                    CornerRadius="5"
                     Margin="0,10"
-                    MaxHeight="300"
+                    MinHeight="90">
-                    HorizontalAlignment="Stretch"
+                    <StackPanel
-                    VerticalAlignment="Stretch"
+                        Margin="10"
-                    Source="{Binding Image}" />
+                        Orientation="Horizontal"
+                        Spacing="20"
+                        HorizontalAlignment="Center">
+                        <Border
+                            BorderBrush="{DynamicResource ThemeControlBorderColor}"
+                            BorderThickness="1"
+                            CornerRadius="5"
+                            Height="100"
+                            Width="100">
+                            <Canvas
+                                Background="{DynamicResource ThemeBackgroundColor}"
+                                Height="100"
+                                Width="100">
+                                <Ellipse 
+                                    Fill="Gray" 
+                                    Stroke="Blue"
+                                    StrokeThickness="1"
+                                    Width="25" 
+                                    Height="25" 
+                                    Canvas.Bottom="{Binding UiStickLeftY}" 
+                                    Canvas.Left="{Binding UiStickLeftX}" />
+                                <Ellipse
+                                    Stroke="Black"
+                                    StrokeThickness="1"
+                                    StrokeDashOffset="2"
+                                    Width="96"
+                                    Height="96"
+                                    Canvas.Bottom="2"
+                                    Canvas.Left="2" />
+                            </Canvas>
+                        </Border>        
+                            <Border
+                            BorderBrush="{DynamicResource ThemeControlBorderColor}"
+                            BorderThickness="1"
+                            CornerRadius="5"
+                            Height="100"
+                            Width="100">
+                            <Canvas
+                                Background="{DynamicResource ThemeBackgroundColor}"
+                                Height="100"
+                                Width="100">
+                                <Ellipse 
+                                    Fill="Gray" 
+                                    Stroke="Blue"
+                                    StrokeThickness="1"
+                                    Width="25" 
+                                    Height="25" 
+                                    Canvas.Bottom="{Binding UiStickRightY}" 
+                                    Canvas.Left="{Binding UiStickRightX}"/>
+                                <Ellipse
+                                    Stroke="Black"
+                                    StrokeThickness="1"
+                                    StrokeDashOffset="2"
+                                    Width="96"
+                                    Height="96"
+                                    Canvas.Bottom="2"
+                                    Canvas.Left="2" />
+                            </Canvas>
+                        </Border>        
+                    </StackPanel>
+                </Border>            
                 <Border
                     BorderBrush="{DynamicResource ThemeControlBorderColor}"
                     BorderThickness="1"