chess-board/ChessPanel/Pieces/King.cs

using Chess;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows;

namespace ChessPanel
{
    public class King : Piece
    {
        public King(PieceColor color, Vector position, Grid fields) : base(position, fields)
        {
            type = (PieceType)Enum.Parse(typeof(PieceType), this.GetType().Name);
            this.color = color;
            this.image = (Image)ChessPanel.Properties.Resources.ResourceManager.GetObject($"{this.type.ToString()}{this.color.ToString()}");
        }

        internal override bool EndageresFieldWithVirtualMove(Grid fields, Field field, Piece movePiece, Field targetPos)
        {
            //#region Movement: 1 in every direction
            //for (int x = -1; x < 2; x++)
            //{
            //    for (int y = -1; y < 2; y++)
            //    {
            //        if ((x == 0 && y == 0) || field.location.X + x > 7 || field.location.Y + y > 7 || field.location.X + x < 0 || field.location.Y + y < 0)
            //            continue;
            //        if (!fields.IsFieldVirtuallyEndagered(fields[field.location, x, y], (this.color == PieceColor.Black ? PieceColor.White : PieceColor.Black), this, fields[field.location, x, y]))
            //            if ((fields[field.location, x, y].IsEmpty && fields[field.location, x, y] != targetPos) || fields[field.location, x, y] == movePiece.field)
            //            {
            //                if (fields[field.location, x, y] == field)
            //                    return true;
            //                continue;
            //            }
            //            else
            //            {
            //                if (fields[field.location, x, y].currentPiece.color != color)
            //                    if (fields[field.location, x, y] == field)
            //                        return true;
            //                break;
            //            }
            //    }
            //}
            //#endregion
            return false;
        }

        internal override Dictionary<Field, PieceTeam> GetValidTargetFields(Grid fields, MoveMode mode = MoveMode.Normal, bool dontTestKingDanger = false)
        {
            var targetFields = GetTargetFields(fields, field, this.color);
            if (!dontTestKingDanger)
            {
                List<Field> remove = new List<Field>();

                foreach (var virtualKinglocation in targetFields.Keys)
                {
                    if (fields.IsFieldVirtuallyEndagered(virtualKinglocation, (this.color == PieceColor.Black ? PieceColor.White : PieceColor.Black), this, virtualKinglocation))
                        remove.Add(virtualKinglocation);
                }
                foreach (var item in remove)
                {
                    targetFields.Remove(item);
                }
            }
            return targetFields;
        }

        internal override Dictionary<Field, PieceTeam> GetTargetFields(Grid fields, Field field, PieceColor color)
        {
            Dictionary<Field, PieceTeam> targetFields = new Dictionary<Field, PieceTeam>();
            #region Castling
            if (!this.HasMoved && false) // Only Castle if King did not move
                foreach (Field item in fields)
                {
                    var itemLocation = item.location;
                    // Sucht nach Ally Turm und prüft, ob er sich schon bewegt hat
                    if (item.currentPiece != null && item.currentPiece.type == PieceType.Rook && !item.currentPiece.HasMoved && item.currentPiece.color == this.color)
                    {
                        if (itemLocation.X == 0 || itemLocation.X == 7)
                        {
                            bool castling = true;
                            for (int x = (itemLocation.X == 0 ? 1 : 5); (itemLocation.X == 0 ? x < 4 : x < 7); x++)
                            {
                                if (!fields[x, (int)field.location.Y].IsEmpty)
                                {
                                    castling = false;
                                    break;
                                }
                            }
                            if (castling) // Only Check endangered Fields if castling is generally possible
                            {
                                for (int x = (itemLocation.X == 0 ? 2 : 4); x < (itemLocation.X == 0 ? 5 : 7); x++) // König steht im Schach oder überschreitet bedrohtes Feld
                                {
                                    if (fields.IsFieldVirtuallyEndagered(fields[x, field.location.Y], (this.color == PieceColor.Black ? PieceColor.White : PieceColor.Black), this, fields[x, field.location.Y]))
                                    {
                                        castling = false;
                                        break;
                                    }
                                }
                                if (castling)
                                {
                                    targetFields.Add(fields[(itemLocation.X == 0 ? 2 : 6), itemLocation.Y], PieceTeam.Ally);
                                }
                            }
                        }
                    }
                }
            #endregion
            #region Movement: 1 in every direction
            for (int x = -1; x < 2; x++)
            {
                for (int y = -1; y < 2; y++)
                {
                    if ((x == 0 && y == 0) || field.location.X + x > 7 || field.location.Y + y > 7 || field.location.X + x < 0 || field.location.Y + y < 0)
                        continue;

                    if (fields[field.location, x, y].IsEmpty)
                    {
                        targetFields.Add(fields[field.location, x, y], PieceTeam.Ally);
                    }
                    else
                    {
                        if (fields[field.location, x, y].currentPiece.color != color)
                            targetFields.Add(fields[field.location, x, y], PieceTeam.Enemy);
                        continue;
                    }
                }
            }
            #endregion
            return targetFields;
        }
    } // CHECKMATE/CHECK-TEST MISSING
}