AI: Add .NET MAUI star map position editor

ZeroSpace/ZeroSpace.MapEditor/Views/MapDrawable.cs

@@ -0,0 +1,77 @@
+using Microsoft.Maui.Graphics;
+using ZeroSpace.MapEditor.Models;
+
+namespace ZeroSpace.MapEditor.Views;
+
+/// <summary>
+/// Draws the star map: connection lines between connected systems and
+/// one circle per system. Names are intentionally not drawn on the
+/// canvas; details live in the inspector.
+/// </summary>
+public sealed class MapDrawable : IDrawable
+{
+    public const double NodeRadius = 14;
+
+    public IList<MapNode> Nodes { get; set; } = Array.Empty<MapNode>();
+
+    public Func<string, MapNode?> FindNode { get; set; } = _ => null;
+
+    /// <summary>Screen pixels per world unit.</summary>
+    public double Scale { get; set; } = 1;
+
+    public double OffsetX { get; set; }
+
+    public double OffsetY { get; set; }
+
+    public void Draw(ICanvas canvas, RectF dirtyRect)
+    {
+        canvas.FillColor = Color.FromArgb("#1e2430");
+        canvas.FillRectangle(dirtyRect);
+
+        PointF ToScreen(double worldX, double worldY) =>
+            new((float)(worldX * Scale + OffsetX), (float)(worldY * Scale + OffsetY));
+
+        // Connections first, so nodes draw on top of the lines.
+        canvas.StrokeColor = Color.FromArgb("#5b6b82");
+        canvas.StrokeSize = Math.Max(1, (float)(1.5 * Scale));
+        foreach (var node in Nodes)
+        {
+            var from = ToScreen(node.X, node.Y);
+            foreach (var name in node.Doc.ConnectedSystems)
+            {
+                var target = FindNode(name);
+                if (target is null || ReferenceEquals(target, node))
+                {
+                    continue;
+                }
+
+                var to = ToScreen(target.X, target.Y);
+                canvas.DrawLine(from, to);
+            }
+        }
+
+        foreach (var node in Nodes)
+        {
+            var center = ToScreen(node.X, node.Y);
+            var radius = (float)(NodeRadius * Scale);
+
+            canvas.FillColor = ColorForKind(node.Doc.Kind);
+            canvas.FillCircle(center, radius);
+
+            if (node.IsSelected)
+            {
+                canvas.StrokeColor = Colors.White;
+                canvas.StrokeSize = 3;
+                canvas.DrawCircle(center, radius + 6);
+            }
+        }
+    }
+
+    public static Color ColorForKind(string kind) => kind switch
+    {
+        "Homeworld" => Color.FromArgb("#43a047"),
+        "Core" => Color.FromArgb("#fb8c00"),
+        "Side" => Color.FromArgb("#4a90d9"),
+        _ => Color.FromArgb("#9aa5b1"),
+    };
+}