北大青鸟 中国象棋 实习项目 (项目源代码级说明四)

 棋子俥:写法最简单的一颗棋子

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace chess
{
    /// <summary>
    /// 棋子车(最简单的棋子)
    /// </summary>
    [Serializable()] 
    class chessItemJu : ChessItemBase
    {

        /// <summary>
        /// 重写父类限制走法方法
        /// </summary>
        /// <param name="ChessX">坐标点的X坐标</param>
        /// <param name="ChessY">坐标点的Y坐标</param>
        /// <returns>返回结果bool</returns>
        protected override bool LimitPoint(int ChessX, int ChessY)
        {
            //先调用基类中的方法限制
            if (base.LimitPoint(ChessX, ChessY))
            {
                Point begin = PointToGrid(this.Location.X, this.Location.Y);
                begin.Offset(1, 1);
                Point end = PointToGrid(ChessX, ChessY);
                //限制只能走直线
                if ((begin.X != end.X) && (begin.Y != end.Y))
                {
                    return false;
                }
                return true;
            }
            else
            {
                return false;
            }

        }
    }
}