DSRectangle.h

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//# DSRectangle.h: Rectangle implementation for "DisplayShapes"
//# Copyright (C) 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_DSRECTANGLE_H
#define TRIALDISPLAY_DSRECTANGLE_H

#include <casa/aips.h>

#include <display/DisplayShapes/DSPoly.h>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Implementation of a rectangle.
// </summary>
//
// <prerequisite>
// <li> <linkto class="DSPoly">DSPoly</linkto>
// <li> <linkto class="DisplayShape">DisplayShape</linkto>
// </prerequisite>
//
// <etymology>
// DSRectangle is a method of managing the drawing of a rectangle onto a 
// PixelCanvas.
// </etymology>
//
// <synopsis>
// DSRectangle is simply a DSPoly with only four points. It has overloaded 
// certain functions however, which cause it to behave as a rectangle when 
// having its points moved etc. It calculates its width and height from 
// points returned from DSPoly when needed.
//
// There are generally two ways to make DisplayShape(s); To create them in 
// "one hit" by providing arguments to the constructor, or by using the 
// default constructor and then the "setOptions" method. A simple interface 
// for all classes inheriting from the 
// <linkto class="DisplayShape">DisplayShape</linkto> class is provided by 
// <linkto class="DisplayShapeInterface">DisplayShapeInterface</linkto>.
// </synopsis>
//
// <motivation>
// The need to draw rectangles on screen.
// </motivation>
//
// <example>
// <srcblock>
// </srcblock>
// </example>
//
// <todo asof="2002/05/13">
// <li> Modify functions like 'changePoint' to allow a special case when 
// angle = 0 for speed reasons.
// </todo>


class DSRectangle : public DSPoly { 

public: 
  
  // Constructors and Destructors
  // <group>
  DSRectangle();
  DSRectangle(const Float& xPos, const Float& yPos, const Float& width, 
              const Float& height, const Bool& handles = False, 
              const Bool& drawHandles = False);
  DSRectangle(const DSRectangle& other);
  virtual ~DSRectangle();
  // </group>
  
  // Standard DisplayShape functions
  // <group>
  virtual void move(const Float& dX, const Float& dY);
  virtual void rotate(const Float& angle);
  virtual void rotateAbout(const Float& angle, const Float& aboutX, 
                           const Float& aboutY);
  virtual void setCenter(const Float& xPos, const Float& yPos);
  virtual void changePoint(const Vector<Float>& pos);
  virtual void changePoint(const Vector<Float>& newPoints, const Int whichOne);
  virtual void addPoint(const Vector<Float>& toAdd);
  // </group>


  // Rectangle specific. Get / set width and height in pixels.
  // <group>
  virtual void setHeight(const Float& height);
  virtual void setWidth(const Float& width);
  virtual Float getHeight();
  virtual Float getWidth();
  // </group>

  // Get and set options
  // <group>
  virtual Bool setOptions(const Record& settings);
  virtual Record getOptions();
  // </group>

  // Using supplied parameters, make a polygon of four points representing the 
  // rectangle. This can then be used to create / alter a DSPoly.
  virtual Matrix<Float> makeAsPoly(const Float& xPos, const Float& yPos, 
                                   const Float& width, const Float& height);

private:

  // Always valid
  Float itsAngle;
  Bool itsValid;

  //Ony used during the set-up period
  Float itsCenter, itsWidth, itsHeight;

  virtual void setDefaultOptions();
  virtual void setAngle(const Float& newAngle);
  
protected:
  virtual Float getAngle();
};


} //# NAMESPACE CASA - END

#endif