chinese_chess/Scripts/Entities/ChessPiece.cs

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

public partial class ChessPiece : Sprite2D {
    [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;
    private readonly IPiece piece;

    public IPiece GetVirtualPiece() {
        return piece;
    }

    private void OnPos(object _self, Vector.Vector2I oldPos) {
        CCPiece self = (CCPiece)_self;
        Position = ChessBoard.PosTrans.transArrToPix * new Vector2(self.Pos.X, self.Pos.Y);
    }

    public void OnSelected(object _self, bool oldIsSelected) {
        CCPiece self = (CCPiece)_self;
        ChessBoard chessBoard = GetParent() as ChessBoard;
        if (self.IsSelected) {
            GD.Print($"{piece.Pos} is selected");
            Transform *= transToSeleted;
            foreach (var item in self.CanMoveAllPos()) {
                chessBoard.canMovePos.Add(ChessBoard.PosTrans.transArrToPix * new Vector2(item.X, item.Y));
            }
        } else {
            GD.Print($"{piece.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;
        this.piece = piece;
        LabelColor = piece.TurnsSide == ChessCore.TurnsSideType.Red ? new Color("red") : new Color("black");
        piece.OnPos +=  OnPos;
        piece.OnSelected += OnSelected;
        // Must Be Call for init Pos
        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);
    }
}