JCanvas.hh

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#ifndef __JROOT__JCANVAS__
#define __JROOT__JCANVAS__

#include <istream>
#include <ostream>
#include <sstream>

#include "JLang/JException.hh"


/**
 * \author mdejong
 */

namespace JROOT {}
namespace JPP { using namespace JROOT; }

namespace JROOT {

  using JLANG::JParseError;


  /**
   * Data structure for size of TCanvas.
   */
  class JCanvas {
  public:
    /**
     * Default constructor.
     */
    JCanvas() :
      x(500),
      y(500)
    {}


    /**
     * Constructor.
     *
     * \param  __x      width
     * \param  __y      height
     */
    JCanvas(const int __x, 
            const int __y) :
      x(__x),
      y(__y)
    {}


    /**
     * Read canvas from input stream.
     *
     * \param  in       input stream
     * \param  cv       canvas
     * \return          input stream
     */
    friend inline std::istream& operator>>(std::istream& in, JCanvas& cv)
    { 
      using namespace std;

      string buffer;

      getline(in,buffer);

      size_t pos = buffer.find(SEPARATOR);

      if (pos != string::npos) {

        istringstream(buffer.substr(0,pos)) >> cv.x; 
        istringstream(buffer.substr(pos+1)) >> cv.y;

      } else {

        THROW(JParseError, "JCanvas error parsing " << buffer);
      }

      return in;
    }


    /**
     * Write canvas to output stream.
     *
     * \param  out      output stream
     * \param  cv       canvas
     * \return          output stream
     */
    friend inline std::ostream& operator<<(std::ostream& out, const JCanvas& cv)
    { 
      out << cv.x << SEPARATOR << cv.y; 

      return out; 
    }


    static const char SEPARATOR = 'x';

    int x;    //!< number of pixels in X
    int y;    //!< number of pixels in Y
  };
}

#endif