multilinestring.cs

来自「Sharp Map 用于制作GIS系统S harp Map 用于制作GIS系统S」· CS 代码 · 共 86 行

// Copyright 2005, 2006 - Morten Nielsen (www.iter.dk)
//
// This file is part of SharpMap.
// SharpMap is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// SharpMap is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with SharpMap; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System;
using System.Collections.Generic;
using System.Text;

namespace SharpMap.Geometries
{
	/// <summary>
	/// A MultiLineString is a MultiCurve whose elements are LineStrings.
	/// </summary>
	[Serializable]
	public class MultiLineString : MultiCurve
	{
		private List<LineString> _LineStrings;
		/// <summary>
		/// Initializes an instance of a MultiLineString
		/// </summary>
		public MultiLineString()
		{
			_LineStrings = new System.Collections.Generic.List<LineString>();
		}

		/// <summary>
		/// Collection of <see cref="LineString">LineStrings</see> in the <see cref="MultiLineString"/>
		/// </summary>
		public List<LineString> LineStrings
		{
			get { return _LineStrings; }
			set { _LineStrings = value; }
		}

		/// <summary>
		/// Returns an indexed geometry in the collection
		/// </summary>
		/// <param name="index">Geometry index</param>
		/// <returns>Geometry at index</returns>
		public new LineString this[int index]
		{
			get { return _LineStrings[index]; }
		}

		/// <summary>
		/// Returns true if all LineStrings in this MultiLineString is closed (StartPoint=EndPoint for each LineString in this MultiLineString)
		/// </summary>
		public override bool IsClosed
		{
			get
			{
				for (int i = 0; i < _LineStrings.Count;i++)
					if (!_LineStrings[i].IsClosed)
						return false;
				return true;
			}
		}

		/// <summary>
		/// The length of this MultiLineString which is equal to the sum of the lengths of the element LineStrings.
		/// </summary>
		public override double Length
		{
			get {
				double l=0;
				for (int i = 0; i < _LineStrings.Count;i++)
					l += _LineStrings[i].Length;
				return l;
			}
		}

		/// <summary>
		/// If true, then this Geometry represents the empty point set,