Projektdateien hinzufügen.

HillLikeGame.cs

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+using osu.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
+using osu.Framework.Platform;
+using osuTK;
+using osuTK.Graphics;
+
+namespace HillLike;
+
+public class HillLikeGame : Game
+{
+    private World _world = null!;
+
+    [BackgroundDependencyLoader]
+    private void Load(GameHost host)
+    {
+        Add(new Container
+        {
+            RelativeSizeAxes = Axes.Both,
+            Children =
+            [
+                _world = new World(),
+                new Hud(_world)
+            ]
+        });
+    }
+
+    protected override void Update()
+    {
+        base.Update();
+        _world.Step((float)(Clock.ElapsedFrameTime / 1000.0));
+    }
+
+    protected override bool OnKeyDown(KeyDownEvent e)
+    {
+        _world.HandleKeyDown(e);
+        return base.OnKeyDown(e);
+    }
+
+    protected override void OnKeyUp(KeyUpEvent e)
+    {
+        _world.HandleKeyUp(e);
+        base.OnKeyUp(e);
+    }
+}
+
+public class Hud : CompositeDrawable
+{
+    private readonly Box _speedBar;
+    private readonly Box _speedBarBg;
+    private readonly World _world;
+
+    public Hud(World world)
+    {
+        this._world = world;
+
+        RelativeSizeAxes = Axes.Both;
+
+        InternalChildren =
+        [
+            _speedBarBg = new Box
+            {
+                Anchor = Anchor.TopLeft,
+                Origin = Anchor.TopLeft,
+                Position = new Vector2(20, 42),
+                Size = new Vector2(260, 10),
+                Colour = new Color4(30, 30, 30, 220)
+            },
+            _speedBar = new Box
+            {
+                Anchor = Anchor.TopLeft,
+                Origin = Anchor.TopLeft,
+                Position = new Vector2(20, 42),
+                Size = new Vector2(0, 10),
+                Colour = new Color4(120, 180, 255, 255)
+            }
+        ];
+    }
+
+    protected override void Update()
+    {
+        base.Update();
+
+        var speed = _world.Car.Velocity.X;
+        _speedBar.Width = 260 * Math.Clamp(Math.Abs(speed) / 25f, 0, 1);
+    }
+}