帮我看看（VC+MO）

我想在地图上动态打出红色实心圆点，可是运行时打出的却是方形的，并且颜色随机变化，以下是我的相关程序，帮我看看啊~
void CEasyMapView::OnMouseDownMap1(short Button, short Shift, long X, long Y)
{
  // Get the tracking layer
 CMoTrackingLayer tLayer(m_map.GetTrackingLayer());
 switch (m_curTool)
 {
   case ID_MAP_ADDEVENT:
    {
    
     CMoPoint mapPt(m_map.ToMapPoint((float)X,(float(Y))));
     CMoTrackingLayer trackLayer(m_map.GetTrackingLayer());
     trackLayer.AddEvent(mapPt,0);
     break;
    }
void CEasyMapView::OnAfterTrackingLayerDrawMap1(long hDC)
{
 // TOD Add your control notification handler code here
 CMoSymbol sym;
 sym.CreateDispatch(TEXT("MapObjects2.Symbol"));
         sym.SetColor(moRed);
 sym.SetSymbolType(moPointSymbol);
 sym.SetStyle(moCircleMarker);
 for (int i = 0; i < m_points.GetSize(); i++)
  m_map.DrawShape(*m_points, sym);
}

<P>我觉得应该把symbol定义在前边,不要放在OnAfterTrackingLayerDrawMap()里边,先定义symbol再画点,你试试!</P>

<P>试了不行~这个有关系么？</P>

<P>在OnInitialUpdate()里面加上下面语句：</P>
<P> CMoTrackingLayer tLayer(m_map.GetTrackingLayer());
 tLayer.SetSymbolCount(1);</P>
<P> CMoSymbol sym(tLayer.GetSymbol(0));
    sym.SetColor(moRed);
    sym.SetSymbolType(moPointSymbol);
    sym.SetStyle(moCircleMarker);
</P>
<P>试试行不。</P>

<P>可以了，谢谢~<img src="images/post/smile/dvbbs/em04.gif" />
以下是总结的两种加红色圆点的方法，供和我有类似问题的新手参考，请大家指教：
一。
void CEasyMapView::OnMouseDownMap1(short Button, short Shift, long X, long Y)
{
 switch (m_curTool)
 {
  case ID_MAP_ADDPOINTS:
    {
      VARIANT va;
      VariantInit(;va);
      va.vt = VT_I4;  
     CMoPoint* point =new CMoPoint(m_map.ToMapPoint((float)X, (float)Y));
     if (LPDISPATCH(point))
    m_points.Add(point);
   // create a temp rectangle with which to refresh the screen
   // around the point
   CMoRectangle r = CMoRectangle();
   r.CreateDispatch(TEXT("MapObjects2.Rectangle"));
   r.SetBottom(point->GetY());
   r.SetLeft(point->GetX());
   r.SetTop(point->GetY()+1.0);
   r.SetRight(point->GetX()+1.0);
   r.ScaleRectangle(50.0);    va.vt = VT_DISPATCH;
   va.pdispVal = r.m_lpDispatch;
   tLayer.Refresh(true, va);
   break;
   }
 }
}
void CEasyMapView::OnAfterTrackingLayerDrawMap1(long hDC)
{
 // TOD Add your control notification handler code here
    CMoSymbol sym;
 if (!sym.CreateDispatch("MapObjects2.Symbol"))
  return;
 sym.SetColor(moPurple);
  // Draw points
 //
 sym.SetColor(moRed);
 sym.SetSymbolType(moPointSymbol);
 sym.SetStyle(moCircleMarker);
 for (int i = 0; i < m_points.GetSize(); i++)
  m_map.DrawShape(*m_points, sym);
}
二。
void CEasyMapView::OnMouseDownMap1(short Button, short Shift, long X, long Y)
{
  switch (m_curTool)
 {
  case ID_MAP_ADDEVENT:
    {
    
      CMoPoint mapPt(m_map.ToMapPoint((float)X,(float(Y))));
      CMoTrackingLayer trackLayer(m_map.GetTrackingLayer());
      trackLayer.AddEvent(mapPt,0);
       break;
     }
  }
}
void CEasyMapView::OnInitialUpdate()
{  
    CMoSymbol sym(tLayer.GetSymbol(0));
    sym.SetColor(moRed);
    sym.SetSymbolType(moPointSymbol);
    sym.SetStyle(moCircleMarker);
}</P>

[此贴子已经被作者于2004-10-23 19:56:48编辑过]

<img src="images/post/smile/dvbbs/em01.gif" /><img src="images/post/smile/dvbbs/em01.gif" />

<img src="images/post/smile/dvbbs/em01.gif" /><img src="images/post/smile/dvbbs/em01.gif" />