primemeridian.cs

Sharp Map 用于制作GIS系统S harp Map 用于制作GIS系统S harp Map 用于制作GIS系统

// 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
{
	/// <summary>
	/// A meridian used to take longitude measurements from.
	/// </summary>
	public class PrimeMeridian : Info, IPrimeMeridian
	{
		/// <summary>
		/// Initializes a new instance of a prime meridian
		/// </summary>
		/// <param name="longitude">Longitude of prime meridian</param>
		/// <param name="angularUnit">Angular unit</param>
		/// <param name="name">Name</param>
		/// <param name="authority">Authority name</param>
		/// <param name="authorityCode">Authority-specific identification code.</param>
		/// <param name="alias">Alias</param>
		/// <param name="abbreviation">Abbreviation</param>
		/// <param name="remarks">Provider-supplied remarks</param>
		internal PrimeMeridian(double longitude, IAngularUnit angularUnit, string name, string authority, long authorityCode, string alias, string abbreviation, string remarks)
			:
			base(name, authority, authorityCode, alias, abbreviation, remarks)
		{
			_Longitude = longitude;
			_AngularUnit = angularUnit;
		}
		#region Predefined prime meridans
		/// <summary>
		/// Greenwich prime meridian
		/// </summary>
		public static PrimeMeridian Greenwich
		{
			get { return new PrimeMeridian(0.0, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Greenwich", "EPSG", 8901, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Lisbon prime meridian
		/// </summary>
		public static PrimeMeridian Lisbon
		{
			get { return new PrimeMeridian(-9.0754862, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Lisbon", "EPSG", 8902, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Paris prime meridian.
		/// Value adopted by IGN (Paris) in 1936. Equivalent to 2 deg 20min 14.025sec. Preferred by EPSG to earlier value of 2deg 20min 13.95sec (2.596898 grads) used by RGS London.
		/// </summary>
		public static PrimeMeridian Paris
		{
			get { return new PrimeMeridian(2.5969213, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Paris", "EPSG", 8903, String.Empty, String.Empty, "Value adopted by IGN (Paris) in 1936. Equivalent to 2 deg 20min 14.025sec. Preferred by EPSG to earlier value of 2deg 20min 13.95sec (2.596898 grads) used by RGS London."); }
		}
		/// <summary>
		/// Bogota prime meridian
		/// </summary>
		public static PrimeMeridian Bogota
		{
			get { return new PrimeMeridian(-74.04513, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Bogota", "EPSG", 8904, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Madrid prime meridian
		/// </summary>
		public static PrimeMeridian Madrid
		{
			get { return new PrimeMeridian(-3.411658, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Madrid", "EPSG", 8905, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Rome prime meridian
		/// </summary>
		public static PrimeMeridian Rome
		{
			get { return new PrimeMeridian(12.27084, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Rome", "EPSG", 8906, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Bern prime meridian.
		/// 1895 value. Newer value of 7 deg 26 min 22.335 sec E determined in 1938.
		/// </summary>
		public static PrimeMeridian Bern
		{
			get { return new PrimeMeridian(7.26225, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Bern", "EPSG", 8907, String.Empty, String.Empty, "1895 value. Newer value of 7 deg 26 min 22.335 sec E determined in 1938."); }
		}
		/// <summary>
		/// Jakarta prime meridian
		/// </summary>
		public static PrimeMeridian Jakarta
		{
			get { return new PrimeMeridian(106.482779, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Jakarta", "EPSG", 8908, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Ferro prime meridian.
		/// Used in Austria and former Czechoslovakia.
		/// </summary>
		public static PrimeMeridian Ferro
		{
			get { return new PrimeMeridian(-17.4, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Ferro", "EPSG", 8909, String.Empty, String.Empty, "Used in Austria and former Czechoslovakia."); }
		}
		/// <summary>
		/// Brussels prime meridian
		/// </summary>
		public static PrimeMeridian Brussels
		{
			get { return new PrimeMeridian(4.220471, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Brussels", "EPSG", 8910, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Stockholm prime meridian
		/// </summary>
		public static PrimeMeridian Stockholm
		{
			get { return new PrimeMeridian(18.03298, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Stockholm", "EPSG", 8911, String.Empty, String.Empty, String.Empty); }
		}
		/// <summary>
		/// Athens prime meridian.
		/// Used in Greece for older mapping based on Hatt projection.
		/// </summary>
		public static PrimeMeridian Athens
		{
			get { return new PrimeMeridian(23.4258815, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Athens", "EPSG", 8912, String.Empty, String.Empty, "Used in Greece for older mapping based on Hatt projection."); }
		}
		/// <summary>
		/// Oslo prime meridian.
		/// Formerly known as Kristiania or Christiania.
		/// </summary>
		public static PrimeMeridian Oslo
		{
			get { return new PrimeMeridian(10.43225, SharpMap.CoordinateSystems.AngularUnit.Degrees, "Oslo", "EPSG", 8913, String.Empty, String.Empty, "Formerly known as Kristiania or Christiania."); }
		}
		#endregion

		#region IPrimeMeridian Members

		private double _Longitude;

		/// <summary>
		/// Gets or sets the longitude of the prime meridian (relative to the Greenwich prime meridian).
		/// </summary>
		public double Longitude
		{
			get { return _Longitude; }
			set { _Longitude = value; }
		}

		private IAngularUnit _AngularUnit;

		/// <summary>
		/// Gets or sets the AngularUnits.
		/// </summary>
		public IAngularUnit AngularUnit
		{
			get { return _AngularUnit; }
			set { _AngularUnit = value; }
		}

		/// <summary>
		/// Returns the Well-known text for this object
		/// as defined in the simple features specification.
		/// </summary>
		public override string WKT
		{
			get
			{
				StringBuilder sb = new StringBuilder();
				sb.AppendFormat(SharpMap.Map.numberFormat_EnUS, "PRIMEM[\"{0}\", {1}", Name, Longitude);
				if (!String.IsNullOrEmpty(Authority) && AuthorityCode > 0)
					sb.AppendFormat(", AUTHORITY[\"{0}\", \"{1}\"]", Authority, AuthorityCode);
				sb.Append("]");
				return sb.ToString();
			}
		}

		/// <summary>
		/// Gets an XML representation of this object
		/// </summary>
		public override string XML
		{
			get
			{
				return String.Format(SharpMap.Map.numberFormat_EnUS, 
					"<CS_PrimeMeridian Longitude=\"{0}\" >{1}{2}</CS_PrimeMeridian>", Longitude, InfoXml, AngularUnit.XML);
			}
		}

		/// <summary>
		/// Checks whether the values of this instance is equal to the values of another instance.
		/// Only parameters used for coordinate system are used for comparison.
		/// Name, abbreviation, authority, alias and remarks are ignored in the comparison.
		/// </summary>
		/// <param name="obj"></param>
		/// <returns>True if equal</returns>
		public override bool EqualParams(object obj)
		{
			if (!(obj is SharpMap.CoordinateSystems.PrimeMeridian))
				return false;
			PrimeMeridian prime = obj as PrimeMeridian;
			return prime.AngularUnit.EqualParams(this.AngularUnit) && prime.Longitude == this.Longitude;
		}

		#endregion
			
	}
}