chinese_chess/Scripts/Entities/ChessPiece.cs

// Chesspiece.cs
using Godot;
using ChineseChess;
using System.Linq;
using System;

using static IPiece;
public partial class ChessPiece : Sprite2D, IPieceOn {
    [Export]
    public string? PieceLabel { get; set; } = null;
    // Text Color (Can Export for Editor Adjust)
    [Export]
    public Color LabelColor { get; set; } = new Color("white");
    private Vector2 textureSize;
    private Label? labelOfChessName;

    void IPieceOn.OnPos(object _self, Vector.Vector2I oldPos) {
        if (_self is not CCPiece self) return;
        Position = ChessBoard.PosTrans.transArrToPix * new Vector2(self.Pos.X, self.Pos.Y);
    }

    void IPieceOn.OnSelected(object _self, bool oldIsSelected) {
        if (GetParent() is not ChessBoard chessBoard || _self is not CCPiece self) return;
        if (self.IsSelected) {
            GD.Print($"{self.Pos} is selected");
            Transform *= transToSeleted;
            foreach (var item in self.CanMoveAllPos()) {
                chessBoard.canMovePos.Add(ChessBoard.PosTrans.transArrToPix * new Vector2(item.X, item.Y));
            }
        } else {
            GD.Print($"{self.Pos} is deselected");
            Transform *= transToSeleted.AffineInverse();
            foreach (var item in self.CanMoveAllPos()) {
                chessBoard.canMovePos.Remove(ChessBoard.PosTrans.transArrToPix * new Vector2(item.X, item.Y));
            }
        }
        chessBoard.QueueRedraw();
    }

    Transform2D transToSeleted = new(
		new Vector2(1.2f, 0),
		new Vector2(0, 1.2f),
		new Vector2(0, 0)
	);

    public ChessPiece() : this(new CCPiece()) {
    }

    public ChessPiece(CCPiece piece) {
        PieceLabel = piece.CNName;
        LabelColor = piece.TurnsSide == ChessCore.TurnsSideType.Red ? new Color("red") : new Color("black");
        piece.On = this;
        // Must Be Call for init Pos
        piece.On.OnPos(piece, piece.Pos);
        piece.Data.TryAdd("Godot", this);
    }

    // Called when the node enters the scene tree for the first time.
    public override void _Ready() {
        InitLabel();
	}

    private void InitLabel() {
        Texture ??= (Texture2D)ResourceLoader.Load("res://Asserts/ChesspieceBase.tres");
        textureSize = Texture.GetSize();
        Vector2 labalPosition = new(
                -textureSize.X / 2,
                -textureSize.Y / 2);
        labelOfChessName = new Label {
            Text = PieceLabel,
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center,
            Modulate = LabelColor,
            Position = labalPosition,
            Size = textureSize,
        };
        // labelOfChessName.SetAnchorsPreset(Control.LayoutPreset.FullRect);
        AddChild(labelOfChessName);
    }
}