LatticeAsContour.h

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//# LatticeAsContour.h: Class to display lattice objects as contoured images
//# Copyright (C) 1996,1997,1998,1999,2000,2001,2002
//# 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: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef TRIALDISPLAY_LATTICEASCONTOUR_H
#define TRIALDISPLAY_LATTICEASCONTOUR_H

//# aips includes:
#include <casa/aips.h>

//# trial includes:
#include <images/Images/ImageInterface.h>

//# display library includes:
#include <display/DisplayDatas/LatticePADD.h>
#include <display/Display/DParameterRange.h>

namespace casa { //# NAMESPACE CASA - BEGIN

//# forwards:
template <class T> class Array;
class IPosition;
class Record;
template <class T> class LatticePADMContour;

// <summary>Class to manage the drawing of contour maps of slices from AIPS++ Lattices</summary>
//
// <use visibility=export>
//
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
//
// <prerequisite>
// <li> <linkto class="LatticePADisplayData">LatticePADisplayData</linkto>
// <li> <linkto class="DisplayData">DisplayData</linkto>
// </prerequisite>
//
// <etymology>
// The purpose of this class is to draw "contour" maps of data that
// is "lattice"-based.
// </etymology>
//
// <synopsis> 
// This class should be used to display contour maps---ie. line
// drawings connecting data points of equal intensity (or level)---of
// two-dimensional slices of data extracted from AIPS++ Lattices or
// Arrays having two or more dimensions.  Thus, this is the class to
// use to display standard zeroth-order moment map contour overlays
// for use on Digitized Sky Survey images, for example.
//
// At construction, any axes in the data can be mapped to the X and Y
// axes of the display device (see the <linkto
// class="PrincipalAxesDD">PrincipalAxesDD</linkto> class).  For data
// with more than two dimensions, a third axis in the dataset can be
// selected for generating a sequence of maps along: this is known
// as the "movie" axis.  Animation (see the <linkto
// class="Animator">Animator</linkto> class) will cause different
// slices of the data to be selected from along this axis.  After
// construction, the axis settings of a LatticeAsContour object can be
// modified at a later stage.
//
// The LatticeAsContour object supports a number of options which can
// be set or retrieved using the setOptions and getOptions functions.
// These functions simply accept a Record, which can be converted from
// a GlishRecord: this is done in the <linkto
// class="GTkDisplayData">GTkDisplayData</linkto> class.  The options
// for the LatticeAsContour class are: 
// <li> levels: a Vector<Float> (or Vector<Double>) of one or more 
// elements, being the data
// values at which the contours are drawn.  Depending on type,
// the values in the vector are interpreted as absolute or
// fractions between the data minimum and maximum.
// <li> type: a String, one of "frac" or "abs", indicating whether the
// contour values in "levels" (multiplied by "scale") are fractions of the
// data range between the minimum and maximum, or are instead absolute 
// contour levels in the native units of the data.
// <li> scale: a Float or Double which provides an additional scale
// factor to apply to the contour levels in "levels."
// <li> line: a positive Integer specifying the line width of
// contours.
// <li> dashneg: a Boolean value, which if True, will force contours 
// at negative data values to be drawn in dashed line style.
// <li> dashpos: a Boolean value, which if True, will force contours 
// at positive data values to be drawn in dashed line style.
// <li> color: a String which is the color with which to draw the
// contours.  A valid X Color is required.
//# <li> complexmode: this is a String, and is only relevant for
//# LatticeAsContour<Complex> or LatticeAsContour<DComplex>
//# instantantiations.  One of "phase", "real", "imaginary" or
//# "magnitude" is appropriate for this option, and indicates how
//# complex data values should be translated to real pixel values.
//#
//# LatticeAsContour is templated, and can be used to draw Complex or Real
//# Images or Arrays.  For Complex data, the default complexmode is 
//# "magnitude."  
//# </synopsis>
//
// <example>
// A LatticeAsContour object could be constructed and used as follows:
// <srcblock>
// PagedImage<Float> *pimage = new PagedImage<Float>(String("test.im"));
// DisplayData *dd;
// uInt ndim = pimage->ndim();
// if (ndim < 2) {
//   throw(AipsError(String("Image has less than two dimensions")));
// } else if (ndim == 2) {
//   dd = (DisplayData *)(new LatticeAsContour<Float>(pimage, 0, 1));
// } else {
//   IPosition fixedPos(ndim);
//   fixedPos = 0;
//   dd = (DisplayData *)(new LatticeAsContour<Float>(pimage, 0, 1, 2,
//                                                   fixedPos));
// }
// // wcHolder is an existing WorldCanvasHolder *...
// wcHolder->addDisplayData(ddata);
// wcHolder->refresh();
// </srcblock>
// </example>
//
// <motivation>
// Displaying 2-dimensional slices of a lattice-based data volume is
// a standard display requirement for astronomical data visualization
// and presentation.
// </motivation>
//
// <templating arg=T>
// </templating>
//
// <thrown>
// </thrown>
//
// <todo asof="yyyy/mm/dd">
// </todo>

template <class T> class LatticeAsContour : public LatticePADisplayData<T> {

 public:

  // Array-based constructors: >2d and 2d.  xAxis and yAxis specify 
  // which axis in the array (0-based) should be mapped to X and Y
  // on the display device: ie. 2-d slices of the data to be displayed
  // have these axes.  mAxis specifies the "movie" axis, which is the axis
  // along which different slices are taken.  fixedPos is an IPosition 
  // having the same length as the number of dimensions in the array, 
  // and indicate the fixed axis values for axes in the data that are
  // not specified as xAxis, yAxis or mAxis.
  // <group>
  LatticeAsContour(Array<T> *array, const uInt xAxis,
                   const uInt yAxis, const uInt mAxis,
                   const IPosition fixedPos);
  LatticeAsContour(Array<T> *array, const uInt xAxis,
                   const uInt yAxis);
  // </group>

  // Image-based constructors: >2d and 2d.  xAxis and yAxis specify 
  // which axis in the image (0-based) should be mapped to X and Y
  // on the display device: ie. 2-d slices of the data to be displayed
  // have these axes.  mAxis specifies the "movie" axis, which is the axis
  // along which different slices are taken.  fixedPos is an IPosition 
  // having the same length as the number of dimensions in the image, 
  // and indicate the fixed axis values for axes in the data that are
  // not specified as xAxis, yAxis or mAxis.
  // <group>
  LatticeAsContour( ImageInterface<T> *image, const uInt xAxis, const uInt yAxis, const uInt mAxis, const IPosition fixedPos, viewer::StatusSink *sink=0 );
  LatticeAsContour(ImageInterface<T> *image, const uInt xAxis,
                   const uInt yAxis);
  // </group>

  // Destructor
  virtual ~LatticeAsContour();

  // Create the various elements in the sequence of displayable
  // maps.  This is called upon construction as well as whenever
  // the display and/or movie axes are changed via a call to 
  // PrincipalAxesDD::setAxes.
  //virtual void setupElements(IPosition fixedPos = IPosition(2));
  virtual void setupElements();

  // install the default options for display
  virtual void setDefaultOptions();

  // Apply the options stored in the provided Record to the 
  // LatticeAsContour object.  If the return value is True, then
  // some options have changed, and a refresh is needed to update
  // the display.
  virtual Bool setOptions(Record &rec, Record &recOut);

  // Retrieve the currently set options, and their types, default
  // values, and any help text associated with each parameter.  This
  // information can be used to generate form-type graphical user 
  // interfaces or command-line interfaces to set the options with
  // prompts.
  virtual Record getOptions();

  // Return the DisplayData type; used by the WorldCanvasHolder to
  // determine the order of drawing.
  virtual Display::DisplayDataType classType() { return Display::Vector; }

  // class name
  virtual String className() { return String("LatticeAsContour");}

  // Actual selected contour levels
  virtual Vector<Float> levels();
  
  // Actual levels, in String format.  If precision is unspecified,
  // one that is low enough not to be cluttered is used.
  virtual String levelString(Int prec=0); 
 
  // Adds contour level information to the standard position tracking
  // string from PADD.
  virtual String showPosition(const Vector<Double> &wld, const Bool &abs,
                              const Bool &dsp);
  
  using LatticePADisplayData<T>::dataUnit;
  
  
 protected:
  
  // Construct user option DisplayParameters (for min/max contour.)
  // (To be used by constructors only.)
  virtual void constructParameters_();

  // Set standard limits/values for contour sliders.  If recOut is provided,
  // they will be set onto it in a manner suitable for updating gui via
  // setOptions.
  virtual void setStdContourLimits_(Record* recOut=0);
   
  
 private:

  // Relative contour levels.
  Vector<Float> itsLevels;
  
  // Min and Max actual contours. linearly scaled from itsLevels to fit these.
  // <group>
  DParameterRange<Float> *itsBaseContour;
  DParameterRange<Float> *itsUnitContour;
  // </group>
  
  Float itsLine;
  Bool itsDashNeg;
  Bool itsDashPos;
  String itsColor;

  friend class LatticePADMContour<T>;

  //# Make parent members known.
public:
  using LatticePADisplayData<T>::nelements;
  using LatticePADisplayData<T>::nPixelAxes;
  using LatticePADisplayData<T>::fixedPosition;
  using LatticePADisplayData<T>::displayAxes;
  using LatticePADisplayData<T>::dataShape;
  using LatticePADisplayData<T>::getMinAndMax;
  using LatticePADisplayData<T>::readOptionRecord;
  using LatticePADisplayData<T>::getDataMin;
  using LatticePADisplayData<T>::getDataMax;
  
protected:
  using LatticePADisplayData<T>::setNumImages;
  using LatticePADisplayData<T>::DDelement;
  using LatticePADisplayData<T>::datamax;
};


} //# NAMESPACE CASA - END

#ifndef AIPS_NO_TEMPLATE_SRC
#include <display/DisplayDatas/LatticeAsContour.tcc>
#endif //# AIPS_NO_TEMPLATE_SRC
#endif