basic cursor

half-earth/nodes/grid_cursor.tscn

@@ -0,0 +1,9 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://textures/icon.png" type="Texture" id=1]
+[ext_resource path="res://scripts/GridCursor.cs" type="Script" id=2]
+
+[node name="Grid Cursor" type="Sprite"]
+modulate = Color( 0, 1, 1, 0.533333 )
+texture = ExtResource( 1 )
+script = ExtResource( 2 )

half-earth/scripts/GridCursor.cs

@@ -0,0 +1,33 @@
+using Godot;
+using System;
+
+public class GridCursor : Sprite
+{
+    [Export]
+    public NodePath Grid { get; set; }
+    private WorldGrid _grid;
+
+    public override void _Ready()
+    {
+        _grid = GetNode<WorldGrid>(Grid);
+    }
+    
+    public override void _Input(InputEvent @event)
+    {
+        base._Input(@event);
+        
+        if (@event is InputEventMouseMotion mouseMoveEvent)
+        {
+            var pos = mouseMoveEvent.Position;
+            _grid.GetGridPos(pos, out var x, out var y);
+            var position = new Vector2(x + .5f, y + .5f) * _grid.CellSize;
+            this.Position = position;
+        }
+        else if (@event is InputEventMouseButton mouseButtonEvent)
+        {
+            var pos = mouseButtonEvent.Position;
+            _grid.GetGridPos(pos, out var x, out var y);
+            GD.Print($"({x}, {y})");
+        }
+    }
+}