add map editor

asmrobot

2019-11-13 576b92fd82f568572bc4beb125fa0ba0191a602f

 src/RichCreator.Utility/Structs/ZTPoint.cs

@@ -58,6 +58,11 @@
            return new ZTPoint(this.X + val.X, this.Y + val.Y);
        }

        public ZTPoint Add(Int32 x, Int32 y)
        {
            return new ZTPoint(this.X + x, this.Y + y);
        }

        /// <summary>
        /// 两个坐标相减
        /// </summary>