AE添加设置线要素，并添加

基本上与添加点要素相同，只是多加了一个双击的结束响应，和一个mousemove的响应，主要程序如下，

case 1://添加mousedown函数
  {
   HRESULT hr;
   if(m_pNewLineFeedback ==NULL)
   {
    CoCreateInstance(CLSID_NewLineFeedback,
        NULL,CLSCTX_ALL,IID_INewLineFeedback,
        (void**)&m_pNewLineFeedback);
    ISymbolPtr isymbol;
    if(m_pNewLineFeedback == NULL) return;
    m_pNewLineFeedback->get_Symbol(&isymbol);
    ISimpleLineSymbolPtr pslnsym(isymbol);
    if(pslnsym == NULL) return;
    IRgbColorPtr prgb(CLSID_RgbColor);
    prgb->put_Red(0);
    prgb->put_Green(205);
    prgb->put_Blue(0);
    IColorPtr icolor(prgb);

    pslnsym->put_Color(icolor);
    pslnsym->put_Style(esriSLSDot);

    IScreenDisplayPtr pScrD;
    iActiveView->get_ScreenDisplay(&pScrD);

    m_pNewLineFeedback->putref_Display(pScrD);
    m_pNewLineFeedback->Start(ipoint);
   }
   else
    hr = m_pNewLineFeedback->AddPoint(ipoint);
   break;
  }

void CAoEx1View::OnDoubleClickMapcontrol1(long button, long shift, long X, long Y, double mapX, double mapY)
{
 // TODO: 在此处添加消息处理程序代码
 IActiveViewPtr iActiveView(m_ipMap);
 switch(m_operateType)
 {
 case 1:
  {
   IPolylinePtr ipolyline;
   if(m_pNewLineFeedback == NULL) break;
   if(m_isymbol != NULL) m_pNewLineFeedback->putref_Symbol(m_isymbol);
   m_pNewLineFeedback->Stop(&ipolyline);
   m_pgeometry = ipolyline;
   if(ipolyline != NULL)
    AddCreateElement(m_pgeometry,iActiveView);
   m_pNewLineFeedback =NULL;
   iActiveView->Refresh();
  }break;

｝

void CAoEx1View::OnTestMarkerStyle()//打开选择要素类型对话框函数

{
 // TODO: 在此添加命令处理程序代码
 //IActiveViewPtr iActiveView(m_ipMap);
 ISymbolSelectorPtr pSymbolSelector(CLSID_SymbolSelector);//symbol select
 VARIANT_BOOL bOK;
 if(pSymbolSelector == NULL) return;
 switch(m_operateType)
 {
  case 0:
  {
   ISimpleMarkerSymbolPtr psimpleMarksb(CLSID_SimpleMarkerSymbol);//simple marker
   pSymbolSelector->AddSymbol((ISymbolPtr)psimpleMarksb,&bOK);//将simple marker添加到symbol select中
  }
  break;
  case 1:
  {
   ISimpleLineSymbolPtr psimpleLinesb(CLSID_SimpleLineSymbol);//simple marker
   pSymbolSelector->AddSymbol((ISymbolPtr)psimpleLinesb,&bOK);//将simple marker添加到symbol select中
  }
  break;
 }

 HRESULT hr;
 hr = pSymbolSelector->SelectSymbol(0,&bOK);
 if(FAILED(hr)) return;
 if(bOK)
  pSymbolSelector->GetSymbolAt(0,&m_isymbol);

void CAoEx1View::AddCreateElement(IGeometryPtr pgeomln, IActiveViewPtr iactiveview)
{
 IGraphicsContainerPtr pgracont(iactiveview);

 switch(m_operateType)
 {
 case 0:
  {
   IMarkerElementPtr pmarkerelem(CLSID_MarkerElement);//创建element对象，是element
   if(pmarkerelem == NULL) return;
   IMarkerSymbolPtr imarkerSymbol(m_isymbol);//用m_isymbol初始化imarkerSymbol，是symbol
   pmarkerelem->put_Symbol(imarkerSymbol);//将symbol添加到element
   ((IElementPtr)pmarkerelem)->put_Geometry(pgeomln);
   pgracont->AddElement((IElementPtr)pmarkerelem,0);
  }break;
 case 1:
  {
   ILineElementPtr plineelem(CLSID_LineElement);
   if(plineelem ==NULL) break;
   if(m_isymbol != NULL)
   {
    ILineSymbolPtr ilineSymbol(m_isymbol);
    plineelem->put_Symbol(ilineSymbol);
   }
   IElementPtr pelem(plineelem);
   pelem->put_Geometry(pgeomln);
   pgracont->AddElement(pelem,0);
   
  }break;
 }
}

void CAoEx1View::OnMouseMoveMapcontrol1(long button, long shift, long X, long Y, double mapX, double mapY)
{
 MapComposer mapComposer;
 mapComposer.m_ipMap = m_ctrlMap.get_Map();
 mapComposer.ShowMouseCoord(mapX,mapY);
 IPointPtr pPoint(CLSID_Point);
 pPoint->PutCoords(mapX,mapY);
 switch(m_operateType)
 {
 case 1:
  m_ctrlMap.put_MousePointer(2);//esriPointerCrosshair == 2
  if(m_pNewLineFeedback != NULL)
   m_pNewLineFeedback->MoveTo(pPoint);
  break;
 }
 // TODO: 在此处添加消息处理程序代码
}