DSText.h

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//# Text.h: Text 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_DSTEXT_H
#define TRIALDISPLAY_DSTEXT_H

#include <casa/aips.h>

#include <display/DisplayShapes/DisplayShape.h>
#include <display/Display/DisplayEnums.h>

#include <casa/Arrays/Matrix.h>
#include <casa/Arrays/Vector.h>

namespace casa { //# NAMESPACE CASA - BEGIN

        class DParameterString;
        class DParameterFontChoice;
        class DParameterMapKeyChoice;
        template <class T> class DParameterRange;

// <summary>
// Implementation of text.
// </summary>
//
// <prerequisite>
// <li> <linkto class="DisplayShape">DisplayShape</linkto>
// </prerequisite>
//
// <etymology>
// DSText is a method of managing the drawing of text onto a PixelCanvas.
// </etymology>
//
// <synopsis>
// DSText is designed to have the same interface as any other 'shape'
// extending DisplayShape. Much of the functionality is exactly the same,
// and hence provides a usefull wrapper for text in an 'annotations' context.
//
// 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>
// To create a text wrapper which behaved in the same was as any other
// DisplayShape
// </motivation>
//
// <example>
// <srcblock>
// </srcblock>
// </example>


        class DSText : public DisplayShape {

        public:

                // Constructors and destructors
                // <group>
                DSText();
                DSText(const DSText& other);
                DSText(const Float& xPos, const Float& yPos, const String& text = "Label",
                       const Bool& hasHandles = True, const Bool& drawHandles = True);

                virtual ~DSText();
                // </group>

                // Functions to ensure consistancy with the "DisplayShape" interface.
                // <group>
                virtual void draw(PixelCanvas* pix);
                virtual void move(const Float& dX, const Float& dY);
                virtual void rotate(const Float& angle);
                virtual Bool inObject(const Float& xPos, const Float& yPos);
                virtual void changePoint(const Vector<Float>& newPos);
                virtual void changePoint(const Vector<Float>& newPos, const Int nPoint);
                virtual void scale(const Float& scaleFactor);
                virtual void setCenter(const Float& xPos, const Float& yPos);
                virtual Vector<Float> getCenter();
                // </group>

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


        private:
                // This is a bit messy, so seperate it out
                void makeAlignmentChoice();

                // Update handle positions
                virtual void calculateHandlePositions();

                // Cast from int to enum
                Display::TextAlign toEnum(const Int fromInt);

                // Text Parameter
                DParameterString* itsString;

                // Angle Param
                DParameterRange<Float>* itsAngle;
                DParameterMapKeyChoice* itsAlignment;
                DParameterFontChoice* itsFont;
                DParameterRange<Int>* itsFontSize;

                // Rotate about a point.. overloaded but not used
                Vector<Float> itsCenter;
                Int itsPixHeight, itsPixWidth;
                Bool itsValid;
                Bool itsHandlesMade, itsValidPositions;
                Float itsStringLength;
                Float itsStringHeight;
                Matrix<Float> itsHandleLocation;
                Display::TextAlign itsAlign;
                virtual void setDefaultOptions();


        };

} //# NAMESPACE CASA - END

#endif