GodotComponentTest/scenes/StreamContainer.cs

using Godot;
using System;

public class StreamContainer : Spatial
{
    // scene nodes
    private MeshInstance _bounds;
    private Spatial _activeTiles;
    
    // resources
    private PackedScene _hexTileScene = GD.Load<PackedScene>("res://scenes/HexTile3D.tscn");
    
    // exports
    [Export] public Vector2 _dimensions = new Vector2(8, 4);
   
    // other members
    private Rect2 _worldRect;
    private Rect2 _offsetCoordRect;
    private HexGrid _hexGrid;

    public Rect2 OffsetCoordRect
    {
        get { return _offsetCoordRect; }
    }
    
    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        _bounds = GetNode<MeshInstance>("Bounds");
        _activeTiles = GetNode<Spatial>("ActiveTiles");
        
        _hexGrid = new HexGrid();

        Transform boundsTransform = Transform.Identity;
        boundsTransform = boundsTransform.Scaled(new Vector3(_dimensions.x, 1, _dimensions.y));
        _bounds.Transform = boundsTransform;
    }

    
    public void UpdateRects(Vector2 centerPlane)
    {
        Vector2 bottomLeftCoord = centerPlane - new Vector2(_dimensions.x / 2, _dimensions.y / 2);
        Vector2 topRightCoord = centerPlane + new Vector2(_dimensions.x / 2, _dimensions.y / 2);
       
        _worldRect = new Rect2(bottomLeftCoord, _dimensions);
        GD.Print("World rect now: " + _worldRect.ToString() + " center: " + _worldRect.GetCenter());

        // y axis needs to be inverted as HexGrid's offset coordinates use the opposite axis direction
        HexCell bottomLeftCell = _hexGrid.GetHexAt(new Vector2(bottomLeftCoord.x, topRightCoord.y));
        HexCell topRightCell = _hexGrid.GetHexAt(new Vector2(topRightCoord.x, bottomLeftCoord.y));
        _offsetCoordRect = new Rect2(bottomLeftCell.OffsetCoords,
            topRightCell.OffsetCoords - bottomLeftCell.OffsetCoords + Vector2.One);
        GD.Print("Offset rect now: " + _offsetCoordRect.ToString() + " center: " + _offsetCoordRect.GetCenter());

        Transform boundsTransform = _bounds.Transform;
        boundsTransform.origin.x = centerPlane.x;
        boundsTransform.origin.z = centerPlane.y;
        _bounds.Transform = boundsTransform;
        
        GD.Print("Bounds Transform: " + boundsTransform.ToString());
        GD.Print("Bounds Global   : " + _bounds.GlobalTransform.ToString());
    }
    
    public void SetCenterTile(HexCell cell)
    {
        UpdateRects(_hexGrid.GetHexCenter(cell));
    }
}