距离测量

实现在IMapcontrol上采点，双击结束采点进行距离测量，并标注在IMapcontrol上，实现结果如下：

1. 初始化主要变量：

1         private bool m_bStart = false;
2         private INewLineFeedback m_pNewLineFeedback = null;
3         private IPoint m_prevPoint = null;
4         private double m_CurDistance = 0.0;
5         private double m_TotalDistance = 0.0;

2.MouseDown事件：

 1 IPoint pt = m_pMapControl.ToMapPoint(X, Y);
 2 
 3             if (m_bStart && m_pNewLineFeedback != null)
 4             {
 5                 m_pNewLineFeedback.AddPoint(pt);
 6                               if (m_prevPoint != null)
 7                 {
 8                     m_CurDistance = ReturnDistance(m_prevPoint, pt);
 9                     m_TotalDistance += m_CurDistance;
10                     m_prevPoint = pt;
11                 }
12             }
13             else
14             {
15                 m_pNewLineFeedback.Display = m_pMapControl.ActiveView.ScreenDisplay;
16                 m_bStart = true;
17                 m_pNewLineFeedback.Start(pt);
18                 m_prevPoint = pt;
19              }

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3.MouseDoubleClick事件：

 1 try
 2             {
 3                 IPolyline pline = m_pNewLineFeedback.Stop();
 4                 IGraphicsContainer pGraphicsContainer = m_pMapControl.ActiveView as IGraphicsContainer;
 5                 
 6                 DrawElement(pline, pGraphicsContainer);
 7             }
 8             catch (Exception ex)
 9             {
10                 System.Windows.Forms.MessageBox.Show(ex.ToString(), "提示");
11 
12             }
13             m_TotalDistance = 0;
14             m_bStart = false;

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4.在Mapcontrol上添加标注：

添加所画线的标注：

1             IRgbColor pColor = new RgbColorClass();
 2             ILineElement pLineElement = new LineElementClass();
 3             IElement pElement = pLineElement as IElement;
 4             pElement.Geometry = pLine as IGeometry;
 5 
 6             ISimpleLineSymbol pSmplLine = new SimpleLineSymbolClass();
 7             pColor = new RgbColorClass();
 8             pColor.Red = 0; pColor.Blue = 250; pColor.Green = 0;
 9             pSmplLine.Color = pColor as IColor;
10             pSmplLine.Style = esriSimpleLineStyle.esriSLSSolid;
11             pSmplLine.Width = 1;
12             pLineElement.Symbol = pSmplLine as ILineSymbol;
13 
14             pGraphicsContainer.AddElement(pElement, 0);

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添加文字标注：

 1            ITextElement pTextElement = new TextElementClass();
 2             pElement = pTextElement as IElement;
 3             pElement.Geometry = pLine as IGeometry;
 4             ISimpleTextSymbol pSimpleTextSymbol = new TextSymbolClass();
 5             
 6             pColor.Red = 255; pColor.Green = 0; pColor.Blue = 0;
 7             pSimpleTextSymbol.Color = pColor as IColor;
 8             stdole.IFont font = new stdole.StdFontClass();
 9             font.Name = "宋体";
10             font.Bold = false;
11             font.Size = 18;
12             pSimpleTextSymbol.Font = font as IFontDisp;
13 
14             pTextElement.Symbol = (ITextSymbol)pSimpleTextSymbol;
15             pTextElement.ScaleText = false;
16             pTextElement.Text = "距离：" + pLine.Length.ToString("0.00") + " 米";          
17             pGraphicsContainer.AddElement(pElement, 0);

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刷新显示：

1 m_pMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

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另：返回两个IGeometry之间的距离：

1 private double ReturnDistance(IPoint point1, IPoint point2)
2         {
3             IProximityOperator pPO = point1 as IProximityOperator;
4             double dis = pPO.ReturnDistance(point2);
5             return dis;           
6         }

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