LCExtension.h

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// # LCExtension.h: Extend an LCRegion along straight lines to other dimensions
// # Copyright (C) 1998,2001
// # Associated Universities, Inc. Washington DC, USA.
// #
// # This library is free software; you can redistribute it and/or modify it
// # under the terms of the GNU Library General Public License as published by
// # the Free Software Foundation; either version 2 of the License, or (at your
// # option) any later version.
// #
// # This library is distributed in the hope that it will be useful, but WITHOUT
// # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
// # License for more details.
// #
// # You should have received a copy of the GNU Library General Public License
// # along with this library; if not, write to the Free Software Foundation,
// # Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
// #
// # Correspondence concerning AIPS++ should be addressed as follows:
// #        Internet email: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef LATTICES_LCEXTENSION_H
#define LATTICES_LCEXTENSION_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/lattices/LRegions/LCRegionMulti.h>
#include <casacore/lattices/LRegions/LCBox.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// <summary>
// Extend an LCRegion along straight lines to other dimensions
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="" tests="">
// </reviewed>
 
// <prerequisite>
//   <li> <linkto class=LCRegion>LCRegion</linkto>
// </prerequisite>
 
// <synopsis>
// The LCExtension class is a specialization of class
// <linkto class=LCRegion>LCRegion</linkto>.
// It makes it possible to extend a LCRegion along straight lines to
// other dimensions. E.g. a circle in the xy-plane can be extended to
// a cylinder in the xyz-space.
// It can be used for a lattice of any dimensionality as long as the
// dimensionality of the (hyper-)extension matches the dimensionality of
// the lattice.
// </synopsis>
 
// <example>
// <srcblock>
// </srcblock>
// </example>
 
// <todo asof="1997/11/11">
// <li> Extend along (slanted) cone lines
// </todo>
 
class LCExtension : public LCRegionMulti {
 public:
  LCExtension();
 
  // Extend the given region along axes as given by <src>extendAxes</src>
  // from the bottom left corner (blc) to the top right corner (trc)
  // as given by <src>extendBox</src>.
  // Every kind of box (absolute, relative, fractional, unspecified)
  // can be used to define the extension blc and trc.
  // The sum of the dimensionality of the region and the extend box
  // make up the dimensionality of the LCExtension region.
  // Similarly the lattice shapes in region and box are combined.
  // <br>
  // The second version takes over the pointer when the switch is true.
  // <group>
  LCExtension(const LCRegion& region, const IPosition& extendAxes, const LCBox& extendBox);
  LCExtension(Bool takeOver, const LCRegion* region, const IPosition& extendAxes,
              const LCBox& extendBox);
  // </group>
 
  // Copy constructor (copy semantics).
  LCExtension(const LCExtension& other);
 
  virtual ~LCExtension();
 
  // Assignment (copy semantics).
  LCExtension& operator=(const LCExtension& other);
 
  // Make a copy of the derived object.
  LCRegion* cloneRegion() const override;
 
  // Get the original region.
  const LCRegion& region() const;
 
  // Get the extend axes.
  const IPosition& extendAxes() const;
 
  // Get the extend box.
  const LCBox& extendBox() const;
 
  // Get the class name (to store in the record).
  static String className();
 
  // Get the region type.  Returns the class name.
  String type() const override;
 
  // Convert the (derived) object to a record.
  TableRecord toRecord(const String& tableName) const override;
 
  // Convert correct object from a record.
  static LCExtension* fromRecord(const TableRecord&, const String& tableName);
 
 protected:
  // Comparison
  Bool equals(const LCRegion& other) const override;
 
  // Construct another LCRegion (for e.g. another lattice) by moving
  // this one. It recalculates the bounding box and mask.
  // A positive translation value indicates "to right".
  LCRegion* doTranslate(const Vector<Float>& translateVector,
                        const IPosition& newLatticeShape) const override;
 
  // Do the actual getting of the mask.
  void multiGetSlice(Array<Bool>& buffer, const Slicer& section) override;
 
  // This function is needed here because the niceCursorShape of the
  // contributing region does not make any sense (other dimensionality).
  IPosition doNiceCursorShape(uInt maxPixels) const override;
 
 private:
  // Fill the object.
  // <group>
  void fillRegionAxes();
  void fill(const IPosition& stretchAxes, const LCBox& stretchBox);
  // </group>
 
  IPosition itsExtendAxes;
  IPosition itsRegionAxes;
  LCBox itsExtendBox;
};
 
inline const LCRegion& LCExtension::region() const { return *(regions()[0]); }
inline const IPosition& LCExtension::extendAxes() const { return itsExtendAxes; }
inline const LCBox& LCExtension::extendBox() const { return itsExtendBox; }
 
}  // namespace casacore
 
#endif