?? surveytools.cs
字號:
using System;
using System.IO ;
using System.Windows.Forms ;
using System.Reflection ;
using ESRI.ArcGIS.Carto ;
using ESRI.ArcGIS.Display ;
using ESRI.ArcGIS.Geometry ;
namespace AoTest
{
/// <summary>
/// 使用本對象可在地圖上進行距離、面積、角度測量
/// 可取得當前線段長度、線段總長度、多邊形面積、當前線段方位角、當前線段與前一線段夾角
/// 使用時需設置Map變量
/// </summary>
public class SurveyTools
{
private IMap m_pMap; //地圖對象
private IPointCollection m_pPnts; //點集合
private INewPolygonFeedback m_pPolygonFeedback; //新建多邊形對象
private INewLineFeedback m_pLineFeedback; //新建線對象
private int m_iSurveyType; //0-空操作；1-測距離； 2-測面積； 3-測角度
private bool m_bBusy ; //是否正在測量
private double m_dTotalLength =0 ; //線總長度
private double m_dCurrentLength =0 ; //當前線段長度
private double m_dArea = 0 ; //多邊形面積
private double m_dAngle = 0; //當前線段與前一線段的夾角
private double m_dDirection = 0; //與正北方向的夾角,即方位角
/// <summary>
/// Map對象，只寫
/// </summary>
public IMap Map
{
set
{
m_pMap = value;
}
}
/// <summary>
/// 判斷是否正在測量，只讀
/// </summary>
public bool IsSurveying
{
get
{
return m_bBusy;
}
}
/// <summary>
/// 折線總長度，只讀
/// </summary>
public double totalLength
{
get
{
return m_dTotalLength ;
}
}
/// <summary>
/// 當前線段長度，只讀
/// </summary>
public double currentLength
{
get
{
return m_dCurrentLength ;
}
}
/// <summary>
/// 多邊形面積，只讀
/// </summary>
public double Area
{
get
{
return m_dArea ;
}
}
/// <summary>
/// 當前線段與前一線段的夾角，只讀
/// </summary>
public double Angle
{
get
{
return m_dAngle;
}
}
/// <summary>
/// 當前線段的方向角，只讀
/// </summary>
public double Direction
{
get
{
return m_dDirection;
}
}
/// <summary>
/// 構造函數
/// </summary>
public SurveyTools()
{
m_pMap = null;
m_pPnts = null;
m_pPolygonFeedback = null ;
m_pLineFeedback = null;
m_iSurveyType = 0;
m_bBusy = false ;
}
/// <summary>
/// 啟動距離測量,pPnt為測量起點，測量結果為
/// totalLength:線總長度
/// currentLength:當前線段長度
/// 在Map的MouseDown事件中調用本方法
/// </summary>
/// <param name="pPnt">測量起點</param>
public void LengthStart(IPoint pPnt)
{
m_iSurveyType = 1;
m_pLineFeedback = new NewLineFeedbackClass();
m_pLineFeedback.Display =((IActiveView) m_pMap).ScreenDisplay;
m_pLineFeedback.Start(pPnt);
m_bBusy = true;
m_pPnts= new PolylineClass() ;
object ep = System.Reflection.Missing.Value;
m_pPnts.AddPoint(pPnt,ref ep, ref ep) ;
}
/// <summary>
/// 啟動面積測量,pPnt為多邊形起點,測量結果為
/// Area:多邊形面積
/// 在Map的MouseDown事件中調用本方法
/// </summary>
/// <param name="pPnt">測量起點</param>
public void AreaStart(IPoint pPnt)
{
m_iSurveyType = 2;
m_pPolygonFeedback = new NewPolygonFeedbackClass();
m_pPolygonFeedback.Display =((IActiveView) m_pMap).ScreenDisplay;
m_pPolygonFeedback.Start(pPnt);
m_bBusy = true ;
m_pPnts= new PolygonClass() ;
object ep = System.Reflection.Missing.Value;
m_pPnts.AddPoint(pPnt,ref ep, ref ep) ;
}
/// <summary>
/// 開始測角度,pPnt為折線起點,測量結果為
/// Direction:當前線段的方向角，即與正北方向的夾角
/// Angle:當前線段與前一線段的夾角
/// 在Map的MouseDown事件中調用本方法
/// </summary>
/// <param name="pPnt">折線起點</param>
public void AngleStart(IPoint pPnt)
{
m_iSurveyType = 3;
m_pLineFeedback = new NewLineFeedbackClass();
m_pLineFeedback.Display =((IActiveView) m_pMap).ScreenDisplay;
m_pLineFeedback.Start(pPnt);
m_bBusy = true ;
m_pPnts= new PolylineClass() ;
object ep = System.Reflection.Missing.Value;
m_pPnts.AddPoint(pPnt,ref ep, ref ep) ;
}
/// <summary>
/// 向折線或多邊形上添加節(jié)點
/// 在Map的MouseDown事件中調用本方法，將當前光標位置作為節(jié)點
/// 添加到折線或多邊形上
/// </summary>
/// <param name="pPnt">拐點</param>
public void AddPoint(IPoint pPnt)
{
if (m_iSurveyType == 1 || m_iSurveyType == 3)
{
m_pLineFeedback.AddPoint(pPnt);
}
else if (m_iSurveyType == 2)
{
m_pPolygonFeedback.AddPoint(pPnt);
}
object ep = System.Reflection.Missing.Value;
m_pPnts.AddPoint(pPnt,ref ep, ref ep) ;
}
/// <summary>
/// 移動鼠標位置，動態(tài)改變折線或多邊形最后節(jié)點的位置，
/// 重新計算各個測量值，建議在Map的MouseMove事件中調用，
/// 并提取當前的測量結果進行顯示
/// </summary>
/// <param name="pPnt">終點</param>
public void MoveTo(IPoint pPnt)
{
if (m_iSurveyType == 1 || m_iSurveyType == 3)
{
m_pLineFeedback.MoveTo(pPnt) ;
CalculateLength(pPnt);
CalculateDirection(pPnt);
CalculateAngle(pPnt);
}
else if (m_iSurveyType == 2)
{
m_pPolygonFeedback.MoveTo(pPnt);
CalculateArea( pPnt);
}
}
/// <summary>
/// 結束當前的測量,返回進行量算時在地圖上繪的圖形對象
/// 建議在Map的DoubleClick事件或MouseDown(右鍵)事件中調用本方法
/// 將返回對象用map.DrawShape方法繪在地圖臨時層上
/// </summary>
/// <param name="pPnt">終點</param>
/// <returns>地圖上繪的圖形對象</returns>
public IGeometry SurveyEnd(IPoint pPnt)
{
IGeometry pGeometry =null;
if (m_iSurveyType == 1 || m_iSurveyType == 3)
{
m_pLineFeedback.AddPoint(pPnt) ;
pGeometry = (IGeometry) m_pLineFeedback.Stop();
m_pLineFeedback = null;
}
else if (m_iSurveyType == 2)
{
m_pPolygonFeedback.AddPoint(pPnt);
pGeometry = (IGeometry) m_pPolygonFeedback.Stop();
m_pPolygonFeedback = null;
}
m_pPnts = null;
m_bBusy = false;
if (pGeometry != null)
return pGeometry;
else
return null;
}
/// <summary>
/// 計算測量線段長度，結果分別存貯在：
/// totalLength:線總長度
/// currentLength:當前線段長度
/// </summary>
/// <param name="pPnt">計算時的終點</param>
private void CalculateLength(IPoint pPnt)
{
try
{
IPointCollection pPs = new PolylineClass() ;
double dL = 0;
pPs.AddPointCollection(m_pPnts);
IPolyline pLine ;
if (pPs.PointCount > 1 )
{
pLine = (IPolyline) pPs;
dL = pLine.Length ;
}
object ep = System.Reflection.Missing.Value;
pPs.AddPoint(pPnt,ref ep, ref ep) ;
pLine = (IPolyline) pPs;
m_dTotalLength = pLine.Length ;
m_dCurrentLength = m_dTotalLength - dL;
}
catch(System.Exception e)
{
Console.WriteLine(e.Message.ToString());
}
}
/// <summary>
/// 計算多邊形面積,結果存貯在Area中
/// </summary>
/// <param name="pPnt">計算時的終點</param>
private void CalculateArea(IPoint pPnt)
{
try
{
IPointCollection pPs = new PolygonClass() ;
pPs.AddPointCollection(m_pPnts);
object ep = System.Reflection.Missing.Value;
pPs.AddPoint(pPnt,ref ep, ref ep) ;
if (pPs.PointCount > 2 )
{
IPolygon pPolygon =(IPolygon) pPs;
IArea pArea = (IArea) pPolygon;
m_dArea = pArea.Area;
m_dArea = System.Math.Abs(m_dArea);
}
}
catch(System.Exception e)
{
Console.WriteLine(e.Message.ToString());
}
}
/// <summary>
/// 計算當前線段的方向角,結果存貯為Direction中
/// 正北方向為0度，順時針為正，值域為0--360度
/// </summary>
/// <param name="pPnt">計算時的終點</param>
private void CalculateDirection(IPoint pPnt)
{
double dx, dy, da;
IPoint p1, p2;
p1 = m_pPnts.get_Point(m_pPnts.PointCount - 1 );
p2 = pPnt ;
dx = p2.X - p1.X ;
dy = p2.Y - p1.Y ;
if (dx == 0)
{
if (dy >0 )
{
m_dDirection =0;
}
else
{
m_dDirection = 180;
}
}
else if (dx > 0)
{
if (dy==0)
{
m_dDirection=90;
}
else if( dy > 0)
{
da = System.Math.Abs(dx/dy);
m_dDirection = System.Math.Atan(da) * 180 / 3.14159265 ;
}
else if (dy < 0 )
{
da = System.Math.Abs(dx/dy);
m_dDirection = System.Math.Atan(da) * 180 / 3.14159265 ;
m_dDirection = 180 -m_dDirection;
}
}
else
{
if (dy==0)
{
m_dDirection=270;
}
else if (dy >= 0)
{
da = System.Math.Abs(dx/dy);
m_dDirection = System.Math.Atan(da) * 180 / 3.14159265 ;
m_dDirection = 360 - m_dDirection;
}
else
{
da = System.Math.Abs(dx/dy);
m_dDirection = System.Math.Atan(da) * 180 / 3.14159265 ;
m_dDirection = 180 + m_dDirection;
}
}
}
/// <summary>
/// 計算當前線段與前一線段的夾角,結果存貯為Angle中
/// 算法采用余弦定理，結果值域為0--180度.
/// </summary>
/// <param name="pPnt">計算時的終點</param>
private void CalculateAngle(IPoint pPnt)
{
int iCount = m_pPnts.PointCount ;
if (iCount < 2) return ;
double a, aa, b, bb, cc;
IPoint Pnt1, Pnt2, Pnt3;
try
{
Pnt1 = pPnt; Pnt2 = m_pPnts.get_Point(iCount -1); Pnt3 = m_pPnts.get_Point(iCount -2);
aa = (Pnt1.X -Pnt2.X ) * (Pnt1.X -Pnt2.X ) + (Pnt1.Y -Pnt2.Y ) * (Pnt1.Y -Pnt2.Y );
a = Math.Sqrt(aa);
bb = (Pnt3.X -Pnt2.X ) * (Pnt3.X -Pnt2.X ) + (Pnt3.Y -Pnt2.Y ) * (Pnt3.Y -Pnt2.Y );
b = Math.Sqrt(bb);
cc = (Pnt1.X -Pnt3.X ) * (Pnt1.X -Pnt3.X ) + (Pnt1.Y -Pnt3.Y ) * (Pnt1.Y -Pnt3.Y );
m_dAngle = Math.Acos((aa+bb-cc)/2/a/b) * 180 /3.14159265;
}
catch(Exception e)
{
Console.WriteLine(e.Message.ToString());
}
}
}
}
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