coordinatetransformation.cs

C# 的地图开发例子（sharp map)

// 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.CoordinateSystems.Transformations
{
	/// <summary>
	/// Describes a coordinate transformation. This class only describes a 
	/// coordinate transformation, it does not actually perform the transform 
	/// operation on points. To transform points you must use a <see cref="MathTransform"/>.
	/// </summary>
	public class CoordinateTransformation : ICoordinateTransformation
	{
		/// <summary>
		/// Initializes an instance of a CoordinateTransformation
		/// </summary>
		/// <param name="sourceCS">Source coordinate system</param>
		/// <param name="targetCS">Target coordinate system</param>
		/// <param name="transformType">Transformation type</param>
		/// <param name="mathTransform">Math transform</param>
		/// <param name="name">Name of transform</param>
		/// <param name="authority">Authority</param>
		/// <param name="authorityCode">Authority code</param>
		/// <param name="areaOfUse">Area of use</param>
		/// <param name="remarks">Remarks</param>
		internal CoordinateTransformation(ICoordinateSystem sourceCS, ICoordinateSystem targetCS, TransformType transformType, IMathTransform mathTransform, 
										string name, string authority, long authorityCode, string areaOfUse, string remarks)
			: base()
		{
			_TargetCS = targetCS;
			_SourceCS = sourceCS;
			_TransformType = transformType;
			_MathTransform = mathTransform;
			_Name = name;
			_Authority = authority;
			_AuthorityCode = authorityCode;
			_AreaOfUse = areaOfUse;
			_Remarks = remarks;			
		}
		


		#region ICoordinateTransformation Members

		private string _AreaOfUse;
		/// <summary>
		/// Human readable description of domain in source coordinate system.
		/// </summary>		
		public string AreaOfUse
		{
			get { return _AreaOfUse; }
		}

		private string _Authority;
		/// <summary>
		/// Authority which defined transformation and parameter values.
		/// </summary>
		/// <remarks>
		/// An Authority is an organization that maintains definitions of Authority Codes. For example the European Petroleum Survey Group (EPSG) maintains a database of coordinate systems, and other spatial referencing objects, where each object has a code number ID. For example, the EPSG code for a WGS84 Lat/Lon coordinate system is