// sunny code 6 Nov 2004
// 自定义测距工具
using System;
using MapInfo.Mapping;
using MapInfo.Web.UI.WebControls;
using MapInfo.Geometry;

namespace WebGIS
{
	/// <summary>
	/// Summary description for customAreaTool.
	/// </summary>
	public class customAreaTool:MapTool
	{
		private string _clientStartMethod;
		private string _clientStopMethod;
		private string _clientCodeSource = null;
		private string _name;
		private double dblArea =0;
		public static readonly string Toolname = "customAreaTool";

		public delegate void customAreaToolEventHander( Object sender, customAreaToolEnventArgs e );
		public event         customAreaToolEventHander CalculateFinished;

		public customAreaTool()
		{
			//
			// TODO: Add constructor logic here
			//
			_name = Toolname;
			// We use MapInfo's rectangle drawing client side code
			ClientStartMethod = "MapInfoWebPolygonStart";
			ClientStopMethod = "MapInfoWebPolygonStop";
		}

		

		protected void Reset()
		{
			CalculateFinished = null;
		}

		/// <summary>
		/// Name of the tool, by default it is ZoomInTool
		/// </summary>
		public override string Name 
		{
			get { return _name; }
			set { _name = value; }
		}

		/// <summary>
		/// Name of the client side method to set up mouse event handlers for drawing
		/// </summary>
		public override string ClientStartMethod 
		{
			get { return _clientStartMethod; }
			set { _clientStartMethod = value; }
		}

		/// <summary>
		/// Name of the client side method to cancel the mouse event handlers
		/// </summary>
		public override string ClientStopMethod 
		{
			get { return _clientStopMethod; }
			set { _clientStopMethod = value; }
		}

		/// <summary>
		/// Source or url where the client drawing code is located
		/// </summary>
		public override string ClientCodeSource 
		{
			get { return _clientCodeSource; }
			set { _clientCodeSource = value; }
		}

		/// <summary>
		/// Url of the cursor image when this tool is active
		/// </summary>
		public override string CursorUrl 
		{
			get {return ""; }
			set {; }
		}


		public double Area() 
		{
			return dblArea; 
		}

		/// <summary>
		/// 计算客户端传回区域的面积
		/// </summary>

		public override void Execute(string dataString, System.Collections.ArrayList arrayList, MapInfo.Mapping.Map map) 
		{
			
			// Extract points from the string
			System.Drawing.Point [] points = base.ExtractPoints(dataString);

			//如果点数少于2，就返回
			if( points.Length <= 2 ) return;

			MapInfo.Geometry.DPoint [] temppnts = null;

			//获得前端矩形操作的坐标序列
			map.DisplayTransform.FromDisplay(points,out temppnts);
			int len = temppnts.Length;
            MapInfo.Geometry.DPoint [] pnts = new DPoint[len+1];
			for(int i=0;i< len ;i++)
			{
				pnts[i] = temppnts[i];
			}
			pnts[len] = temppnts[0];

			//在后台生成一个相对应的多边形
			MapInfo.Geometry.CoordSys coordsys = null;
			coordsys = map.GetDisplayCoordSys();
			MapInfo.Geometry.Polygon poly = new Polygon(coordsys,MapInfo.Geometry.CurveSegmentType.Linear,pnts);
			dblArea = poly.Area(MapInfo.Geometry.AreaUnit.SquareKilometer);
			
			//执行完测量操作，触发该事件			
			if(CalculateFinished != null)
			{
				customAreaToolEnventArgs e = new customAreaToolEnventArgs(map, dblArea );
				CalculateFinished(this,e);
			}				
		}

	}///~:end of class customAreaTool

 
	
	//此类，用于传递事件参数
	public class customAreaToolEnventArgs : EventArgs
	{
		private Map _map;
		private double _area;

		public customAreaToolEnventArgs( Map map, double area)
		{
			this._map = map;
			this._area = area;
		}

		public double Area
		{
			get { return _area; }
		}
	}///~:end of class customAreaToolEnventArgs



	// 此类，将自定义工具自定义为服务器端控件。
	public class customAreaToolControl : ToolControl
	{
		public event customAreaTool.customAreaToolEventHander CalculateFinished;
		public customAreaToolControl()
		{				
			TooltipText = "测量面积";
			crsorImageUrl = "/MapXtremeWebResources/MapInfoWebPolygonSelection.cur";				
		}

		protected override void OnLoad(EventArgs e) 
		{
			base.OnLoad(e);

			if( this.mapControl != null )
			{
				customAreaTool MyAreaTool = new customAreaTool();
				this.MapTool = MyAreaTool;
				this.mapControl.MapTools.Add( MyAreaTool );
				MyAreaTool.CalculateFinished += CalculateFinished;
			}			
		}		
	}///~: end of class customAreaToolControl


} //end of namespace WebGIS