private void virtualLayer_MouseMove(object sender , FeatureMouseEventArgs args)
{
Feature hoverFeature = args.Feature;
//在虚拟线上，并且没遇到虚拟顶点 ，显示捕捉点
if (draggingVertex == null && hoverFeature.Geometry is GeoLine)
{
GeoLine line = hoverFeature.Geometry as GeoLine;
Point2D pMap = Map.ScreenToMap(args.GetPosition(Map));
Point2D snap = FindPointOnLineClosestToPoint(line.Parts[0][0] , line.Parts[0][1] , pMap);
if (snapVertex == null)
{
snapVertex = new Feature() { Style = SnapStyle , Geometry = new GeoPoint(snap) };
hoverLayer.Features.Add(snapVertex);
}
else
{
snapVertex.Geometry = new GeoPoint(snap);
}
}
}
private void virtualLayer_MouseLeave(object sender , FeatureMouseEventArgs args)
{
if (snapVertex != null)
{
hoverLayer.Features.Remove(snapVertex);
snapVertex = null;
}
}