/// <summary>
/// Removes the feature with the specified index.
/// </summary>
/// <param name="index">Removes the feature from the specified index location.</param>
public void RemoveAt(int index)
{
// Get shape range so we can update header smartly
int startIndex = index;
IFeatureSet ifs = Select(null, null, ref startIndex, 1);
if (ifs.NumRows() > 0)
{
var shx = new ShapefileIndexFile();
shx.Open(Filename);
shx.Shapes.RemoveAt(index);
shx.Save();
AttributeTable dbf = GetAttributeTable(Filename);
dbf.RemoveRowAt(index);
if (_trackDeletedRows)
{
_deletedRows = dbf.DeletedRows;
}
// Update extent in header if feature being deleted is NOT completely contained
var hdr = new ShapefileHeader(Filename);
Envelope featureEnv = ifs.GetFeature(0).Geometry.EnvelopeInternal;
if (featureEnv.MinX <= hdr.Xmin || featureEnv.MaxX >= hdr.Xmax || featureEnv.MaxY >= hdr.Ymax || featureEnv.MinY <= hdr.Ymin)
{
UpdateExtents();
}
// Update the Quadtree
Quadtree?.Remove(featureEnv, index);
}
}
/// <summary>
/// Cache Index File in memory so we don't have to read it in every call to GetShapes
/// </summary>
/// <returns></returns>
protected ShapefileIndexFile CacheShapeIndexFile()
{
if (null == _shx)
{
_shx = new ShapefileIndexFile();
_shx.Open(Filename);
}
return(_shx);
}
/// <summary>
/// Cache Index File in memory so we don't have to read it in every call to GetShapes
/// </summary>
/// <returns></returns>
protected ShapefileIndexFile CacheShapeIndexFile()
{
if (null == _shx)
{
_shx = new ShapefileIndexFile();
_shx.Open(Filename);
}
return _shx;
}
/// <inheritdocs/>
public void RemoveAt(int index)
{
// Get shape range so we can update header smartly
int startIndex = index;
IFeatureSet ifs = Select(null, null, ref startIndex, 1);
if (ifs.NumRows() > 0)
{
var shx = new ShapefileIndexFile();
shx.Open(Filename);
shx.Shapes.RemoveAt(index);
shx.Save();
AttributeTable dbf = GetAttributeTable(Filename);
dbf.RemoveRowAt(index);
if (_trackDeletedRows)
_deletedRows = dbf.DeletedRows;
// Update extent in header if feature being deleted is NOT completely contained
var hdr = new ShapefileHeader(Filename);
IEnvelope featureEnv = ifs.GetFeature(0).Envelope;
if (featureEnv.Left() <= hdr.Xmin || featureEnv.Right() >= hdr.Xmax || featureEnv.Top() >= hdr.Ymax || featureEnv.Bottom() <= hdr.Ymin)
{
UpdateExtents();
}
// Update the Quadtree
if (null != Quadtree)
{
Quadtree.Remove(featureEnv, index);
}
}
}
