www.pudn.com > C sharp和MapObjects实现.rar > MapTip.cs

using System; 
 
namespace MainSystem 
{ 
	/// 
 
	/// Summary description for MapTip. 
	/// 
 
	public class MapTip 
	{ 
		private double	m_x;			// 当前位置的x坐标 
		private double	m_y;			// 当前位置的y坐标 
		private double	m_lastX;		// 当计时开始时鼠标位置的x坐标 
		private double	m_lastY;		// 当计时开始时鼠标位置的y坐标 
 
		private AxMapObjects2.AxMap					m_map = null; 
		private System.Windows.Forms.Timer			m_timer = null; 
		private System.Windows.Forms.PictureBox		m_picture = null; 
		private System.Windows.Forms.Label			m_lable = null; 
		private CEnvironment						m_env = null; 
		private string								m_szField = "";    
 
		public MapTip(frmMain frm) 
		{ 
			m_map	= frm._map; 
			m_timer	= frm._timer; 
			m_picture = frm._picToolTip; 
			m_lable = frm._lblToolTip; 
			m_szField = "名称"; 
			m_env = frm._environment;  
			m_picture.Visible = false; 
			m_picture.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(255)), ((System.Byte)(192))); 
   
			m_lable.AutoSize = true; 
			m_lable.BackColor = m_picture.BackColor; 
			m_lable.Visible = false; 
		} 
 
		public void MouseMove(double X, double Y) 
		{ 
			m_x = X; 
			m_y = Y; 
 
			if (m_timer.Interval == 1) 
			{ 
				m_lastX = X; 
				m_lastY = Y; 
				m_timer.Interval = 100; 
			} 
			else 
			{ 
				m_picture.Visible = false; 
				m_lable.Visible = false; 
			} 
		} 
 
		private void ShowTipText(string text) 
		{ 
			// 设置标签控件的显示内容与位置 
			m_lable.Text = text; 
			m_lable.Left = m_map.Left + (int)m_x+20; 
			m_lable.Top = m_map.Top + (int)m_y + 11; 
  
			// 设置Picture控件的位置 
			m_picture.Left = m_map.Left + (int)m_x + 10; 
			m_picture.Top = m_map.Top + (int)m_y + 10; 
			m_picture.Width = m_lable.Width + 20; 
			m_picture.Visible = true; 
			m_lable.Visible = true; 
		} 
 
		private bool InMap(double x, double y) 
		{ 
			if (x > m_map.Right || x < m_map.Left) 
				return false; 
 
			if (y > m_map.Top || y < m_map.Bottom) 
				return false; 
 
			return true; 
		} 
 
		public void Timer() 
		{ 
			if (m_x == m_lastX && m_y == m_lastY) 
			{ 
				m_timer.Interval = 1; 
 
				MapObjects2.Recordset recs; 
				recs = DoSearch(); 
				if (recs == null || recs.EOF || InMap(m_x,m_y)) 
				{ 
					m_picture.Visible = false; 
					m_lable.Visible = false; 
				} 
				else 
				{ 
					string szText = recs.Fields.Item (m_szField).Value.ToString(); 
					if (szText != "") 
						ShowTipText(recs.Fields.Item (m_szField).Value.ToString()); 
				} 
			} 
			else 
			{ 
				m_lastX = m_x; 
				m_lastY = m_y; 
			} 
		} 
 
		private MapObjects2.Recordset DoSearch() 
		{ 
			MapObjects2.Point		pt = null; 
			MapObjects2.Recordset rst = null; 
 
			pt = this.m_map.ToMapPoint((float)m_x,(float)m_y);   
			double dScale = m_env.CalcScale(m_map); 
			dScale = dScale/10000; 
			dScale = dScale / 5000; 
 
			for (int i = m_env.m_nLayerNum - 1; i >= 0 ; i --) 
			{ 
				if (m_env.m_layerInfos[i].layer.Visible && m_env.m_layerInfos[i].bCanSelected && m_env.m_layerInfos[i].layer.shapeType == MapObjects2.ShapeTypeConstants.moShapeTypePoint) 
					rst = m_env.m_layerInfos[i].layer.SearchByDistance(pt,dScale,""); 
 
				if (rst != null) 
				{ 
					rst.MoveFirst();  
					if (!rst.EOF) 
						return rst; 
				} 
			} 
 
			for (int i = 0; i < m_env.m_nLayerNum; i ++) 
			{ 
				if (m_env.m_layerInfos[i].bVisible && m_env.m_layerInfos[i].bCanSelected && m_env.m_layerInfos[i].layer.shapeType == MapObjects2.ShapeTypeConstants.moShapeTypeLine)      
					rst = m_env.m_layerInfos[i].layer.SearchByDistance(pt,dScale,""); 
 
				if (rst != null) 
				{ 
					rst.MoveFirst();  
					if (!rst.EOF) 
						return rst; 
				} 
			} 
 
			for (int i = 0; i < m_env.m_nLayerNum; i ++) 
			{ 
				if (m_env.m_layerInfos[i].bVisible && m_env.m_layerInfos[i].bCanSelected && m_env.m_layerInfos[i].layer.shapeType == MapObjects2.ShapeTypeConstants.moShapeTypePolygon )      
					rst = m_env.m_layerInfos[i].layer.SearchByDistance(pt,dScale,""); 
 
				if (rst != null) 
				{ 
					rst.MoveFirst();  
					if (!rst.EOF) 
						return rst; 
				} 
			} 
 
			return rst; 
		} 
 
	} 
}