/// <summary>
/// Returns geometries within the specified bounding box
/// </summary>
/// <param name="bbox"></param>
/// <returns></returns>
public override Collection <Geometry> GetGeometriesInView(BoundingBox bbox)
{
var geoms = new Collection <Geometry>();
OgrDataSource ogrDataSource;
using (var ogrLayer = GetLayer(_layerIndex, out ogrDataSource))
{
ogrLayer.SetSpatialFilterRect(bbox.MinX, bbox.MinY, bbox.MaxX, bbox.MaxY);
try
{
var reader = new OgrGeometryReader(Factory);
OgrFeature ogrFeature;
while ((ogrFeature = ogrLayer.GetNextFeature()) != null)
{
using (var gr = ogrFeature.GetGeometryRef())
{
//var geom = ParseOgrGeometry(gr, Factory);
var geom = reader.Read(gr);
if (geom != null)
{
geoms.Add(geom);
}
}
ogrFeature.Dispose();
}
ogrDataSource.Dispose();
}
catch (Exception ex)
{
_log.Debug(t => t(ex.Message));
}
}
return(geoms);
}
/// <summary>
/// Returns the data associated with all the geometries that are intersected by 'geom'
/// </summary>
/// <param name="bbox">Geometry to intersect with</param>
/// <param name="ds">FeatureDataSet to fill data into</param>
public override void ExecuteIntersectionQuery(BoundingBox bbox, FeatureDataSet ds)
{
OgrDataSource ogrDataSource;
using (var ogrLayer = GetLayer(_layerIndex, out ogrDataSource))
{
ogrLayer.SetSpatialFilterRect(bbox.MinX, bbox.MinY, bbox.MaxX, bbox.MaxY);
ExecuteIntersectionQuery(ds, ogrLayer);
ogrDataSource.Dispose();
}
}
/// <summary>
/// Returns geometry Object IDs whose bounding box intersects 'bbox'
/// </summary>
/// <param name="bbox"></param>
/// <returns></returns>
public override Collection <uint> GetObjectIDsInView(BoundingBox bbox)
{
var objectIDs = new Collection <uint>();
OgrDataSource ogrDataSource;
using (var ogrLayer = GetLayer(_layerIndex, out ogrDataSource))
{
ogrLayer.SetSpatialFilterRect(bbox.MinX, bbox.MinY, bbox.MaxX, bbox.MaxY);
OgrFeature ogrFeature;
while ((ogrFeature = ogrLayer.GetNextFeature()) != null)
{
objectIDs.Add((uint)ogrFeature.GetFID());
ogrFeature.Dispose();
}
ogrDataSource.Dispose();
}
return(objectIDs);
}
///// <summary>
///// Loads a Ogr datasource with the first layer
///// </summary>
///// <param name="datasource">datasource</param>
///// <param name="name">Returns the name of the loaded layer</param>
/////<remarks>
/////This constructor is obsolete!
/////If you want this functionality use
/////<example>
/////SharpMap.Data.Providers.Ogr prov = new SharpMap.Data.Providers.Ogr(datasource);
/////string layerName = prov.Layername;
/////</example>
/////</remarks>
//[Obsolete("This constructor does not work well with VB.NET. Use LayerName property instead")]
//public Ogr(string datasource, out string name)
// : this(datasource, 0, out name)
//{
//}
#endregion
#region IProvider Members
/// <summary>
/// Boundingbox of the dataset
/// </summary>
/// <returns>boundingbox</returns>
public override BoundingBox GetExtents()
{
if (_bbox == null)
{
OgrEnvelope ogrEnvelope = new OgrEnvelope();
using (var ogrLayer = GetLayer(LayerIndex))
{
if (ogrLayer != null)
{
ogrLayer.GetExtent(ogrEnvelope, 1);
}
}
_bbox = new BoundingBox(ogrEnvelope.MinX, ogrEnvelope.MaxX,
ogrEnvelope.MinY, ogrEnvelope.MaxY);
}
return(_bbox);
}
public void GetFeaturesInView(BoundingBox bbox, FeatureDataSet ds)
{
ExecuteIntersectionQuery(bbox, ds);
}
