Initial orbiting craft

src/Testing/DebugUI.cs

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+using System.Collections.Generic;
+using Godot;
+using Quadratic.Carto.Craft;
+using Quadratic.Carto.MathExt;
+
+namespace Quadratic.Carto.Testing;
+
+public partial class DebugUI : Control
+{
+    [Export]
+    Control minimapContainer = null!;
+
+    [Export]
+    Vector2 minimapSize = new Vector2(360, 360);
+
+    [Export]
+    float minimapSizeUnit = 6372;
+
+    [Export]
+    float minimapUnitLength = 90;
+
+    [Export]
+    Polygon2D planetOutline = null!;
+
+    [Export]
+    Control vesselIndicator = null!;
+
+    [Export]
+    Krakensbane krakensbane = null!;
+
+    [Export]
+    Label displayLabel = null!;
+
+    public override void _Ready()
+    {
+        // draw the planet outline
+        var polygon = new List<Vector2>();
+        const int maxPoints = 360;
+        var minimapCenter = minimapSize / 2;
+        for (int i = 0; i < maxPoints; i++)
+        {
+            var angle = (float)i / maxPoints * Mathf.Pi * 2;
+            var point = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * minimapUnitLength + minimapCenter;
+            polygon.Add(point);
+        }
+        planetOutline.Polygon = polygon.ToArray();
+    }
+
+    public override void _Process(double delta)
+    {
+        if (krakensbane.FocusedVessel == null)
+        {
+            return;
+        }
+
+        var vesselPosition = krakensbane.GetPositionOf(krakensbane.FocusedVessel);
+        var minimapCenter = minimapSize / 2;
+        var minimapPosition3D = (vesselPosition / minimapSizeUnit).AsSingle().AsGodot() * minimapUnitLength;
+        var minimapPosition2D = new Vector2(-minimapPosition3D.Y, minimapPosition3D.X) + minimapCenter;
+        vesselIndicator.Position = minimapPosition2D;
+
+        displayLabel.Text = $"Vessel position:\n{vesselPosition.X},\n{vesselPosition.Y},\n{vesselPosition.Z}";
+    }
+}