/// <summary>
/// 通过射线来判定第一个相交的要素
/// </summary>
/// <param name="ray"></param>
/// <returns></returns>
public bool GetSelectedFeatureByRayCasting(Ray ray)
{
//计算Ray于地球的交点
bool isIntersect = _scene.Ellipsoid.Intersections(ray, out Geodetic2D result);
//ImGui.Text(string.Format("Latitude:{0},logitude:{1}",result.Latitude,result.Longitude));
SelectedFeatures.Clear();
var geoFactory = new NetTopologySuite.Geometries.GeometryFactory();
if (isIntersect)
{
//是否考虑根据当前精度生成一个合适的Enve
//这里一律采用0.001经纬度的精度
var env = new GeoAPI.Geometries.Envelope(new Coordinate(result.Longitude * 180 / Math.PI - 0.001, result.Latitude * 180 / Math.PI - 0.001), new Coordinate(result.Longitude * 180 / Math.PI + 0.001, result.Latitude * 180 / Math.PI + 0.001));
var selectedff = _quadTree.Query(env);
foreach (var item in selectedff)
{
if (item.Geometry.Intersects(geoFactory.ToGeometry(env)))
{
SelectedFeatures.Add(item);
}
}
return(true);
}
return(false);
}