事实上，就是利用计时器，闪烁目标。
void CmapwingisTest3View::OnTimerTracking()
{
m_map.put_Projection(PROJECTION_NONE );
m_map.put_GrabProjectionFromData(TRUE );
m_map.put_DisableWaitCursor(true );
CString filename1 = "E:\mapwingis\MapViewer\data\buildings.shp";//图ª?层?数ºy据Y
CString filename2 = "E:\mapwingis\MapViewer\data\roads.shp";
CString filename3 = "E:\mapwingis\MapViewer\data\path.shp";
if (!::PathFileExists(filename1) || !::PathFileExists(filename2) || !::PathFileExists(filename3))
{
AfxMessageBox("Couldn't find the files (buildings.shp, roads.shp, path.shp): " );
}
else
{
mapWindow::IShapefilePtr sf;
sf.CreateInstance(__uuidof(mapWindow::Shapefile));
sf->Open(_bstr_t(filename1),false );
m_map.AddLayer( sf,TRUE) ;
sf.CreateInstance(__uuidof(mapWindow::Shapefile));
sf->Open(_bstr_t(filename2),false );
m_map.AddLayer( sf,TRUE) ;
mapWindow::ILabelsPtr labels=sf->GetLabels( );//?
labels->PutFontSize(6);
labels->PutFontBold(true);
labels->PutFontOutlineVisible(false);
labels->PutFontOutlineWidth(1);
mapWindow::ILabelCategoryPtr cat;
labels->AddCategory("Red");
labels->Generate( "[Name]", lpLongestSegement, false);
IUtilsPtr utils ;//= new Utils();
utils.CreateInstance(__uuidof(mapWindow::Utils));
ILinePatternPtr pattern ;//= new LinePattern();
pattern.CreateInstance(__uuidof(mapWindow::LinePattern));
pattern->AddLine( utils->ColorByName( Brown ), 10.0f, dsSolid);
pattern->AddLine( utils->ColorByName( Yellow ), 9.0f, dsSolid);
IShapeDrawingOptionsPtr drawingoption;
drawingoption.CreateInstance(__uuidof(mapWindow::ShapeDrawingOptions));
drawingoption->PutLinePattern( pattern );
drawingoption->PutUseLinePattern(true );
sf->PutDefaultDrawingOptions( drawingoption );
m_map.AddLayer(sf, true);
sf.CreateInstance(__uuidof(mapWindow::Shapefile));
sf->Open(_bstr_t(filename3),NULL );
m_map.AddLayer(sf, true);
long ShapeIndex =0;
m_path = sf->GetShape( ShapeIndex );
m_map.SetMapUnits( umMeters );
m_map.put_CurrentScale( 5000.0 );
SetTimer(1,250,NULL);
}
}
void CmapwingisTest3View::OnTimer(UINT_PTR nIDEvent)//计数器
{
// moves car a step further
m_distance += m_step;
double Length=0.0;
m_path->get_Length( &Length );
if (m_distance > Length)
m_distance = Length - m_distance;
//calculating the current position (x2, y2)
double distance = 0.0;
double x1, x2, y1, y2;
int numPoints = m_path->GetnumPoints();
x1= x2 = y1 = y2 = 0.0;
for (long i = 1; i < numPoints; i++)//根据路径计算当前位置
{
m_path->GetXY(i,&x2, &y2);
m_path->GetXY(i-1,&x1, &y1);
double val = sqrt(pow(x2 - x1, 2.0) + pow(y2 - y1, 2.0));
if (distance + val > m_distance)
{
double ratio = (m_distance - distance) / val;
x2 = x1 + (x2 - x1) * ratio;
y2 = y1 + (y2 - y1) * ratio;
//distance += val * ratio;
break;
}
if (distance + val < m_distance)
{
distance += val;
}
else
{
break;
}
}
DrawPosition(x2, y2);
CFormView::OnTimer(nIDEvent);
}
void CmapwingisTest3View::DrawPosition(double x, double y)//// Displays the point in the current position 显示
{
m_map.ClearDrawings();
IExtents *ext = m_map.GetMaxExtents();
double xMin,xMax,yMin,yMax;
double pxX, pxY;
ext->get_xMin(&xMin );
ext->get_xMax(&xMax );
ext->get_yMin(&yMin );
ext->get_yMax(&yMax );
if (x < xMin || x > xMax || y < yMin || y > yMax)
{（http://www.amjmh.com/v/）
double width = (xMax - xMin) / 2.0;
double height = (yMax - yMin) / 2.0;
ext->SetBounds( x - width, y - height, 0.0, x + width, y + height, 0.0);
m_map.put_Extents( ext );
}
if (m_count % 2 == 0)//偶数显示，实现闪烁效果
{
int handle = m_map.NewDrawing(dlScreenReferencedList);
pxX = 0.0;
pxY = 0.0;
m_map.ProjToPixel(x, y, &pxX, &pxY);//坐标转换
m_map.DrawCircleEx(handle, pxX, pxY, 5.0, 255, true);//画圆圈
}
m_count++;
return;
}