/****************************************************************************
** COPYRIGHT (C):    1997 Cay S. Horstmann. All Rights Reserved.
** PROJECT:          Practical OO Development with C++ and Java
** FILE:             grstream.cpp
** PURPOSE:          graphics stream (chapter 13)
** VERSION           1.0
** PROGRAMMERS:      Cay Horstmann (CSH)
** RELEASE DATE:     3-15-97 (CSH)
** UPDATE HISTORY:
****************************************************************************/

/* Project:
   GUI Application
   Add files
      grstream.cpp
      \PracticalOOBook\cpplib\graphics.cpp
   Additional include directory:
      \PracticalOOBook\cpplib
*/

#include "setup.h"
#include "graphics.h"

class GraphicStreambuf : public streambuf
{
public:
   GraphicStreambuf(Graphics& g);
protected:
   virtual int overflow(int c);
   virtual int underflow() { return 0; }
private:
   Graphics& _g;
	FontMetrics _fm;

   int _xnext;
   int _ynext;
};

class GraphicStream : public ostream
{
public:
   GraphicStream(Graphics&);
private:
   GraphicStreambuf _buffer;
};

/*-------------------------------------------------------------*/

GraphicStreambuf::GraphicStreambuf(Graphics& g)
: _g(g), _xnext(0), _fm(g.getFontMetrics())
{	_ynext = _fm.getAscent() + _fm.getDescent();
}

/*.............................................................*/

int GraphicStreambuf::overflow(int c)
{  string s;
	
   switch(c)
   {  case EOF:
         break;
      case '\n':
         _xnext = 0;
			_ynext += _fm.getAscent() + _fm.getDescent();         
         break;
      default:
         s = (char)c;
         _g.drawString(s, _xnext, _ynext);
         _xnext += _fm.stringWidth(s);
         break;
   }
   return 1;
}

/*-------------------------------------------------------------*/

GraphicStream::GraphicStream(Graphics& g)
:  _buffer(g),
   ostream(&_buffer)
{}

/*-------------------------------------------------------------*/

/* Test code: */

void paint(Graphics& g)
{  GraphicStream gs(g);
   gs << "Hello, World" << endl << 3.14;
}