VC+MapX鹰眼实现

最新推荐文章于 2010-07-13 17:19:00 发布

qsd007

最新推荐文章于 2010-07-13 17:19:00 发布

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本文介绍了一种在地图应用程序中实现鹰眼图的方法。通过在同一个视图窗口下放置两个CMapX控件，一个作为主图，另一个作为鹰眼图。详细解释了如何创建这两个控件并设置它们的地理坐标，以及如何通过映射特定的消息来响应用户的交互操作。

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我的基本实现想法是，在同一个View窗口下家两个CMapX控件，一个称为主图，一个称为鹰眼图。

CMapX m_ctrlMapX; ///主图

CMapX m_eagleMapX; ///鹰眼图

注意事项：在View里的OnCreate函数一定要想创建m_eagleMapX，这样才能看见鹰眼图。既如此：

m_eagleMapX.Create(NULL, WS_VISIBLE, CRect(0, 0, 120, 120), this, IDC_MAP_EAGLE);
m_eagleMapX.SetGeoSet(NULL);

m_ctrlMapX.Create(NULL, WS_VISIBLE, CRect(0, 0, 100, 100), this, IDC_MAP);
m_ctrlMapX.SetGeoSet(NULL);

接下来，可以在主图里挑几层加到鹰眼图中（区域图层）

再在消息中映射几个消息：

ON_EVENT(CMTRSView, IDC_MAP_EAGLE, DISPID_MOUSEMOVE /* MouseMove */, OnMouseMoveEagleMap, VTS_I2 VTS_I2 VTS_R4 VTS_R4)
ON_EVENT(CMTRSView, IDC_MAP_EAGLE, DISPID_MOUSEDOWN /* MouseDown */, OnMouseDownEagleMap, VTS_I2 VTS_I2 VTS_R4 VTS_R4)
ON_EVENT(CMTRSView, IDC_MAP_EAGLE, DISPID_MOUSEUP /* MouseUp */, OnMouseUpEagleMap, VTS_I2 VTS_I2 VTS_R4 VTS_R4)
最后实现这几个函数：

void CMTRSView::OnMouseUpEagleMap(short Button, short Shift, float X, float Y)
{
///用户单击导航图上某点的处理
if(strMouseState == "Begin")
{
  double dblMapX1, dblMapY1;
///求出该点的地理坐标
  m_eagleMapX.ConvertCoord(&X, &Y, &dblMapX1, &dblMapY1, miScreenToMap);
///设置主图的地理坐标
  m_ctrlMapX.SetCenterX(dblMapX1);
  m_ctrlMapX.SetCenterY(dblMapY1);
}
///用户在导航图上框出矩形区域时的处理
if(strMouseState == "Move")
{
  Single sngXMax, sngXMin, sngYMax, sngYMin;
  if(PreX < X)
  {
   sngXMax = X;
   sngXMin = PreX;
  }
  else
  {
   sngXMax = PreX;
   sngXMin = X;
  }

  if(PreX < Y)
  {
   sngYMax = Y;
   sngYMin = PreY;
  }
  else
  {
   sngYMax = PreY;
   sngYMin = Y;
  }

  double dblXMax, dblXMin, dblYMax, dblYMin;
  m_eagleMapX.ConvertCoord(&sngXMin, &sngYMin, &dblXMin, &dblYMin, miScreenToMap);
  m_eagleMapX.ConvertCoord(&sngXMax, &sngYMax, &dblXMax, &dblYMax, miScreenToMap);

  CMapXRectangle rect;
  rect.CreateDispatch(rect.GetClsid());
  rect.Set(dblXMin, dblYMin, dblXMin, dblYMax);
  m_ctrlMapX.SetBounds(rect.m_lpDispatch);
}
strMouseState = "Stop";
}

void CMTRSView::OnMouseDownEagleMap(short Button, short Shift, float X, float Y)
{
CMapXFeatures ftrs = m_eagleMapX.GetLayers().Item("EagleLayer").AllFeatures();
for(int i = 1; i <= ftrs.GetCount(); i++)
{
  m_eagleMapX.GetLayers().Item("EagleLayer").DeleteFeature(ftrs.Item(i));
}
if(Button == vbLeftButton)
{
  strMouseState = "Begin";
  PreX = X;
  PreY = Y;
}

}

void CMTRSView::OnMouseMoveEagleMap(short Button, short Shift, float X, float Y)
{
if(Button != vbLeftButton) return;
CMapXRectangle rctMap;
CMapXPoints pntsMap;
CMapXPoint pntMap1, pntMap2, pntMap3, pntMap4;
CMapXStyle styLine;
CMapXFeatures ftrs;
CMapXFeature ftr;
Single sngX, sngY;

///得到鼠标单击点的地理坐标
sngX = PreX;
sngY = PreY;
double dblMapX1, dblMapY1;
m_eagleMapX.ConvertCoord(&sngX, &sngY, &dblMapX1, &dblMapY1, miScreenToMap);

///得到鼠标当前点的地理坐标
double dblMapX2, dblMapY2;
m_eagleMapX.ConvertCoord(&X, &Y, &dblMapX2, &dblMapY2, miScreenToMap);

///设置矩形的四角
pntMap1.CreateDispatch(pntMap1.GetClsid());
pntMap2.CreateDispatch(pntMap2.GetClsid());
pntMap3.CreateDispatch(pntMap3.GetClsid());
pntMap4.CreateDispatch(pntMap4.GetClsid());

pntMap1.Set(dblMapX1, dblMapY2);
pntMap2.Set(dblMapX2, dblMapY2);
pntMap3.Set(dblMapX2, dblMapY1);
pntMap4.Set(dblMapX1, dblMapY1);

///将矩形的四角加入点集中

pntsMap.CreateDispatch(pntsMap.GetClsid());
pntsMap.Add(pntMap1);
pntsMap.Add(pntMap2);
pntsMap.Add(pntMap3);
pntsMap.Add(pntMap4);
pntsMap.Add(pntMap1);

styLine.SetLineColor(miColorBlack); ///定义样式的线条颜色
styLine.SetLineWidth(1); ///定义样式的线条宽度
styLine.SetLineStyle(3); ///虚线

///将导航图鹰眼层所有对象清空
ftrs = m_eagleMapX.GetLayers().Item("EagleLayer").AllFeatures();
for(int i = 1; i <= ftrs.GetCount(); i++)
{
m_eagleMapX.GetLayers().Item("EagleLayer").DeleteFeature(ftrs.Item(i));
}

///在导航图鹰眼层画虚线矩形框,框出用户预选择的范围
CMapXFeature ftrMap;
COleVariant pntsVt, styVt;

pntsVt.vt = VT_DISPATCH;
pntsVt.pdispVal = pntsMap.m_lpDispatch;
pntsVt.pdispVal->AddRef();

styVt.vt = VT_DISPATCH;
styLine.CreateDispatch(styLine.GetClsid());
styVt.pdispVal = styLine.m_lpDispatch;
styVt.pdispVal->AddRef();

ftrMap = m_eagleMapX.GetFeatureFactory().CreateLine(pntsVt, styVt);
m_eagleMapX.GetLayers().Item("EagleLayer").AddFeature(ftrMap);

///设置鼠标状态为"Move"
strMouseState = "Move";
}

还有，可以在OnSize里面设置一下鹰眼图的大小.