PCVGBuffer.h

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//# PCVGBuffer.h: buffering vector graphics for the PixelCanvases
//# Copyright (C) 1993,1994,1995,1996,1998,1999,2000
//# 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_PCVGBUFFER_H
#define TRIALDISPLAY_PCVGBUFFER_H

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

namespace casa { //# NAMESPACE CASA - BEGIN

class PixelCanvas;

// <summary>
//   
// </summary>
//
// <use visibility=export>
//
// <reviewed>
// </reviewed>
//  
// <prerequisite>
// <li> none
// </prerequisite>
//
// <etymology>
// The name of PCVGBuffer comes from ...
// </etymology>
//
// <synopsis>
// Display Class File
// </synopsis>
//
// <motivation>
// </motivation>
//
// <example>
// none available.
// </example>
//
// <todo>
// <li> write and test!
// </todo>
//

class PCVGBuffer {

 public:

  enum AccumMode { AMNone, 
                   AMPoints, 
                   AMLines,
                   AMPolyline,
                   AMPolygon };

  // Default Constructor Required
  PCVGBuffer(PixelCanvas * pc, uInt nVerts = 1024);

  // User Constructor
  PCVGBuffer();

  // add point
  void accumPoint(Float x, Float y);
  
  // add line
  void accumLine(Float x1, Float y1, Float x2, Float y2);
  
  // add point to polyline
  void accumPolylinePoint(Float x, Float y);

  // add point to polygon
  void accumPolygonPoint(Float x, Float y);

  // flush the buffer
  void flush();
  
  // current mode
  AccumMode mode() const { return mode_; }
  
  // change modes
  void setMode(AccumMode m);

  // check size and make more if needed
  void checkSpace();

  // Destructor
  virtual ~PCVGBuffer();

 private:

  PixelCanvas * pc_;

  AccumMode mode_;
  uInt c_;
  Matrix<Float> verts_;
  uInt blockSize_;

};


} //# NAMESPACE CASA - END

#endif