RhodeCode

/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library.

 *

 * Copyright (C) 2003-2008

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef LEMON_ERROR_H

#define LEMON_ERROR_H

/// \ingroup exceptions

/// \file

/// \brief Basic exception classes and error handling.

#include <exception>

#include <string>

#include <sstream>

#include <iostream>

#include <cstdlib>

#include <memory>

namespace lemon {

  /// \addtogroup exceptions

  /// @{

  /// \brief Generic exception class.

  ///

  /// Base class for exceptions used in LEMON.

  ///

  class Exception : public std::exception {

  public:

    virtual ~Exception() throw() {}

    virtual const char* what() const throw() {

      return "lemon::Exception";

    }

  };

  /// \brief Input-Output error

  ///

  /// This exception is thrown when a file operation cannot be

  /// succeeded.

  class IoError : public Exception {

  protected:

    std::string _message;

    std::string _file;

    mutable std::string _what;

  public:

    /// Copy constructor

      message(error._message);

      file(error._file);

    }

    /// Constructor

      IoError::message(message);

    }

    /// Constructor

      IoError::message(message);

    }

    /// Constructor

      IoError::message(message);

      IoError::file(file);

    }

    /// Constructor

      IoError::message(message);

      IoError::file(file);

    }

    /// Virtual destructor

    virtual ~IoError() throw() {}

    /// Set the error message

      try {

        _message = message;

      } catch (...) {}

    }

    /// Set the error message

      try {

        _message = message;

      } catch (...) {}

    }

    /// Set the file name

      try {

        _file = file;

      } catch (...) {}

    }

    /// Returns the error message

      return _message;

    }

    /// \brief Returns the filename

    ///

      return _file;

    }

    /// \brief Returns a short error message

    ///

    virtual const char* what() const throw() {

      try {

        _what.clear();

        std::ostringstream oss;

        oss << "lemon:IoError" << ": ";

        }

        _what = oss.str();

      }

      catch (...) {}

      if (!_what.empty()) return _what.c_str();

      else return "lemon:IoError";

    }

  };

  /// \brief Format error

  ///

  class FormatError : public Exception {

  protected:

    std::string _message;

    std::string _file;

    int _line;

    mutable std::string _what;

  public:

    /// Copy constructor

      message(error._message);

      file(error._file);

      line(error._line);

    }

    /// Constructor

      FormatError::message(message);

      _line = 0;

    }

    /// Constructor

      FormatError::message(message);

      _line = 0;

    }

    /// Constructor

      FormatError::message(message);

      FormatError::file(file);

      FormatError::line(line);

    }

    /// Constructor

      FormatError::message(message);

      FormatError::file(file);

      FormatError::line(line);

    }

    /// Virtual destructor

    virtual ~FormatError() throw() {}

    /// Set the line number

    /// Set the error message

      try {

        _message = message;

      } catch (...) {}

    }

    /// Set the error message

      try {

        _message = message;

      } catch (...) {}

    }

    /// Set the file name

      try {

        _file = file;

      } catch (...) {}

    }

    /// \brief Returns the line number

    ///

    /// Returns the line number or zero if it was not specified.

    /// Returns the error message

      return _message;

    }

    /// \brief Returns the filename

    ///

      return _file;

    }

    /// \brief Returns a short error message

    ///

    /// Returns a short error message which contains the message, the

    /// file name and the line number.

    virtual const char* what() const throw() {

      try {

        _what.clear();

        std::ostringstream oss;

        oss << "lemon:FormatError" << ": ";

          oss << " (";

          oss << ")";

        }

        _what = oss.str();

      }

      catch (...) {}

      if (!_what.empty()) return _what.c_str();

      else return "lemon:FormatError";

    }

  };

  /// @}

}

#endif // LEMON_ERROR_H

/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library.

 *

 * Copyright (C) 2003-2008

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef LEMON_GRAPH_TO_EPS_H

#define LEMON_GRAPH_TO_EPS_H

#include<iostream>

#include<fstream>

#include<sstream>

#include<algorithm>

#include<vector>

#ifndef WIN32

#include<sys/time.h>

#include<ctime>

#else

#define WIN32_LEAN_AND_MEAN

#define NOMINMAX

#include<windows.h>

#endif

#include<lemon/math.h>

#include<lemon/core.h>

#include<lemon/dim2.h>

#include<lemon/maps.h>

#include<lemon/color.h>

#include<lemon/bits/bezier.h>

#include<lemon/error.h>

///\ingroup eps_io

///\file

///\brief A well configurable tool for visualizing graphs

namespace lemon {

  namespace _graph_to_eps_bits {

    template<class MT>

    class _NegY {

    public:

      typedef typename MT::Key Key;

      typedef typename MT::Value Value;

      const MT ↦

      int yscale;

      _NegY(const MT &m,bool b) : map(m), yscale(1-b*2) {}

      Value operator[](Key n) { return Value(map[n].x,map[n].y*yscale);}

    };

  }

///Default traits class of \ref GraphToEps

///Default traits class of \ref GraphToEps.

///

///\c G is the type of the underlying graph.

template<class G>

struct DefaultGraphToEpsTraits

{

  typedef G Graph;

  typedef typename Graph::Node Node;

  typedef typename Graph::NodeIt NodeIt;

  typedef typename Graph::Arc Arc;

  typedef typename Graph::ArcIt ArcIt;

  typedef typename Graph::InArcIt InArcIt;

  typedef typename Graph::OutArcIt OutArcIt;

  const Graph &g;

  std::ostream& os;

  typedef ConstMap<typename Graph::Node,dim2::Point<double> > CoordsMapType;

  CoordsMapType _coords;

  ConstMap<typename Graph::Node,double > _nodeSizes;

  ConstMap<typename Graph::Node,int > _nodeShapes;

  ConstMap<typename Graph::Node,Color > _nodeColors;

  ConstMap<typename Graph::Arc,Color > _arcColors;

  ConstMap<typename Graph::Arc,double > _arcWidths;

  double _arcWidthScale;

  double _nodeScale;

  double _xBorder, _yBorder;

  double _scale;

  double _nodeBorderQuotient;

  bool _drawArrows;

  double _arrowLength, _arrowWidth;

  bool _showNodes, _showArcs;

  bool _enableParallel;

  double _parArcDist;

  bool _showNodeText;

  ConstMap<typename Graph::Node,bool > _nodeTexts;

  double _nodeTextSize;

  bool _showNodePsText;

  ConstMap<typename Graph::Node,bool > _nodePsTexts;

  char *_nodePsTextsPreamble;

  bool _undirected;

  bool _pleaseRemoveOsStream;

  bool _scaleToA4;

  std::string _title;

  std::string _copyright;

  enum NodeTextColorType

    { DIST_COL=0, DIST_BW=1, CUST_COL=2, SAME_COL=3 } _nodeTextColorType;

  ConstMap<typename Graph::Node,Color > _nodeTextColors;

  bool _autoNodeScale;

  bool _autoArcWidthScale;

  bool _absoluteNodeSizes;

  bool _absoluteArcWidths;

  bool _negY;

  bool _preScale;

  ///Constructor

  ///Constructor

  ///\param _g  Reference to the graph to be printed.

  ///\param _os Reference to the output stream.

  ///\param _os Reference to the output stream.

  ///By default it is <tt>std::cout</tt>.

  ///\param _pros If it is \c true, then the \c ostream referenced by \c _os

  ///will be explicitly deallocated by the destructor.

  DefaultGraphToEpsTraits(const G &_g,std::ostream& _os=std::cout,

                          bool _pros=false) :

    g(_g), os(_os),

    _coords(dim2::Point<double>(1,1)), _nodeSizes(1), _nodeShapes(0),

    _nodeColors(WHITE), _arcColors(BLACK),

    _arcWidths(1.0), _arcWidthScale(0.003),

    _nodeScale(.01), _xBorder(10), _yBorder(10), _scale(1.0),

    _nodeBorderQuotient(.1),

    _drawArrows(false), _arrowLength(1), _arrowWidth(0.3),

    _showNodes(true), _showArcs(true),

    _enableParallel(false), _parArcDist(1),

    _showNodeText(false), _nodeTexts(false), _nodeTextSize(1),

    _showNodePsText(false), _nodePsTexts(false), _nodePsTextsPreamble(0),

    _undirected(lemon::UndirectedTagIndicator<G>::value),

    _pleaseRemoveOsStream(_pros), _scaleToA4(false),

    _nodeTextColorType(SAME_COL), _nodeTextColors(BLACK),

    _autoNodeScale(false),

    _autoArcWidthScale(false),

    _absoluteNodeSizes(false),

    _absoluteArcWidths(false),

    _negY(false),

    _preScale(true)

  {}

};

///Auxiliary class to implement the named parameters of \ref graphToEps()

///Auxiliary class to implement the named parameters of \ref graphToEps().

///

///For detailed examples see the \ref graph_to_eps_demo.cc demo file.

template<class T> class GraphToEps : public T

{

  // Can't believe it is required by the C++ standard

  using T::g;

  using T::os;

  using T::_coords;

  using T::_nodeSizes;

  using T::_nodeShapes;

  using T::_nodeColors;

  using T::_arcColors;

  using T::_arcWidths;

  using T::_arcWidthScale;

  using T::_nodeScale;

  using T::_xBorder;

  using T::_yBorder;

  using T::_scale;

  using T::_nodeBorderQuotient;

  using T::_drawArrows;

  using T::_arrowLength;

  using T::_arrowWidth;

  using T::_showNodes;

  using T::_showArcs;

  using T::_enableParallel;

  using T::_parArcDist;

  using T::_showNodeText;

  using T::_nodeTexts;

  using T::_nodeTextSize;

  using T::_showNodePsText;

  using T::_nodePsTexts;

  using T::_nodePsTextsPreamble;

  using T::_undirected;

  using T::_pleaseRemoveOsStream;

  using T::_scaleToA4;

  using T::_title;

  using T::_copyright;

  using T::NodeTextColorType;

  using T::CUST_COL;

  using T::DIST_COL;

  using T::DIST_BW;

  using T::_nodeTextColorType;

  using T::_nodeTextColors;

  using T::_autoNodeScale;

  using T::_autoArcWidthScale;

  using T::_absoluteNodeSizes;

  using T::_absoluteArcWidths;

  using T::_negY;

  using T::_preScale;

  // dradnats ++C eht yb deriuqer si ti eveileb t'naC

  typedef typename T::Graph Graph;

  typedef typename Graph::Node Node;

  typedef typename Graph::NodeIt NodeIt;

  typedef typename Graph::Arc Arc;

  typedef typename Graph::ArcIt ArcIt;

  typedef typename Graph::InArcIt InArcIt;

  typedef typename Graph::OutArcIt OutArcIt;

  static const int INTERPOL_PREC;

  static const double A4HEIGHT;

  static const double A4WIDTH;

  static const double A4BORDER;

  bool dontPrint;

public:

  ///Node shapes

  ///Node shapes.

  ///

  enum NodeShapes {

    /// = 0

    ///\image html nodeshape_0.png

    ///\image latex nodeshape_0.eps "CIRCLE shape (0)" width=2cm

    CIRCLE=0,

    /// = 1

    ///\image html nodeshape_1.png

    ///\image latex nodeshape_1.eps "SQUARE shape (1)" width=2cm

    ///

    SQUARE=1,

    /// = 2

    ///\image html nodeshape_2.png

    ///\image latex nodeshape_2.eps "DIAMOND shape (2)" width=2cm

    ///

    DIAMOND=2,

    /// = 3

    ///\image html nodeshape_3.png

    ///\image latex nodeshape_2.eps "MALE shape (4)" width=2cm

    ///

    MALE=3,

    /// = 4

    ///\image html nodeshape_4.png

    ///\image latex nodeshape_2.eps "FEMALE shape (4)" width=2cm

    ///

    FEMALE=4

  };

private:

  class arcLess {

    const Graph &g;

  public:

    arcLess(const Graph &_g) : g(_g) {}

    bool operator()(Arc a,Arc b) const

    {

      Node ai=std::min(g.source(a),g.target(a));

      Node aa=std::max(g.source(a),g.target(a));

      Node bi=std::min(g.source(b),g.target(b));

      Node ba=std::max(g.source(b),g.target(b));

      return ai<bi ||

        (ai==bi && (aa < ba ||

                    (aa==ba && ai==g.source(a) && bi==g.target(b))));

    }

  };

  bool isParallel(Arc e,Arc f) const

  {

    return (g.source(e)==g.source(f)&&

            g.target(e)==g.target(f)) ||

      (g.source(e)==g.target(f)&&

       g.target(e)==g.source(f));

  }

  template<class TT>

  static std::string psOut(const dim2::Point<TT> &p)

    {

      std::ostringstream os;

      os << p.x << ' ' << p.y;

      return os.str();

    }

  static std::string psOut(const Color &c)

    {

      std::ostringstream os;

      os << c.red() << ' ' << c.green() << ' ' << c.blue();

      return os.str();

    }

public:

  GraphToEps(const T &t) : T(t), dontPrint(false) {};

  template<class X> struct CoordsTraits : public T {

  typedef X CoordsMapType;

    const X &_coords;

    CoordsTraits(const T &t,const X &x) : T(t), _coords(x) {}

  };

  ///Sets the map of the node coordinates

  ///Sets the map of the node coordinates.

  ///\param x must be a node map with \ref dim2::Point "dim2::Point<double>" or

  ///\ref dim2::Point "dim2::Point<int>" values.

  template<class X> GraphToEps<CoordsTraits<X> > coords(const X &x) {

    dontPrint=true;

    return GraphToEps<CoordsTraits<X> >(CoordsTraits<X>(*this,x));

  }

  template<class X> struct NodeSizesTraits : public T {

    const X &_nodeSizes;

    NodeSizesTraits(const T &t,const X &x) : T(t), _nodeSizes(x) {}

  };

  ///Sets the map of the node sizes

  ///Sets the map of the node sizes.

  ///\param x must be a node map with \c double (or convertible) values.

  template<class X> GraphToEps<NodeSizesTraits<X> > nodeSizes(const X &x)

  {

    dontPrint=true;

    return GraphToEps<NodeSizesTraits<X> >(NodeSizesTraits<X>(*this,x));

  }

  template<class X> struct NodeShapesTraits : public T {

    const X &_nodeShapes;

    NodeShapesTraits(const T &t,const X &x) : T(t), _nodeShapes(x) {}

  };

  ///Sets the map of the node shapes

  ///Sets the map of the node shapes.

  ///The available shape values

  ///can be found in \ref NodeShapes "enum NodeShapes".

  ///\param x must be a node map with \c int (or convertible) values.

  ///\sa NodeShapes

  template<class X> GraphToEps<NodeShapesTraits<X> > nodeShapes(const X &x)

  {

    dontPrint=true;

    return GraphToEps<NodeShapesTraits<X> >(NodeShapesTraits<X>(*this,x));

  }

  template<class X> struct NodeTextsTraits : public T {

    const X &_nodeTexts;

    NodeTextsTraits(const T &t,const X &x) : T(t), _nodeTexts(x) {}

  };

  ///Sets the text printed on the nodes

  ///Sets the text printed on the nodes.

  ///\param x must be a node map with type that can be pushed to a standard

  ///\c ostream.

  template<class X> GraphToEps<NodeTextsTraits<X> > nodeTexts(const X &x)

  {

    dontPrint=true;

    _showNodeText=true;

    return GraphToEps<NodeTextsTraits<X> >(NodeTextsTraits<X>(*this,x));

  }

  template<class X> struct NodePsTextsTraits : public T {

    const X &_nodePsTexts;

    NodePsTextsTraits(const T &t,const X &x) : T(t), _nodePsTexts(x) {}

  };

  ///Inserts a PostScript block to the nodes

  ///With this command it is possible to insert a verbatim PostScript

  ///block to the nodes.

  ///The PS current point will be moved to the center of the node before

  ///the PostScript block inserted.

  ///

  ///Before and after the block a newline character is inserted so you

  ///don't have to bother with the separators.

  ///

  ///\param x must be a node map with type that can be pushed to a standard

  ///\c ostream.

  ///

  ///\sa nodePsTextsPreamble()

  template<class X> GraphToEps<NodePsTextsTraits<X> > nodePsTexts(const X &x)

  {

    dontPrint=true;

    _showNodePsText=true;

    return GraphToEps<NodePsTextsTraits<X> >(NodePsTextsTraits<X>(*this,x));

  }

  template<class X> struct ArcWidthsTraits : public T {

    const X &_arcWidths;

    ArcWidthsTraits(const T &t,const X &x) : T(t), _arcWidths(x) {}

  };

  ///Sets the map of the arc widths

  ///Sets the map of the arc widths.

  ///\param x must be an arc map with \c double (or convertible) values.

  template<class X> GraphToEps<ArcWidthsTraits<X> > arcWidths(const X &x)

  {

    dontPrint=true;

    return GraphToEps<ArcWidthsTraits<X> >(ArcWidthsTraits<X>(*this,x));

  }

  template<class X> struct NodeColorsTraits : public T {

    const X &_nodeColors;

    NodeColorsTraits(const T &t,const X &x) : T(t), _nodeColors(x) {}

  };

  ///Sets the map of the node colors

  ///Sets the map of the node colors.

  ///\param x must be a node map with \ref Color values.

  ///

  ///\sa Palette

  template<class X> GraphToEps<NodeColorsTraits<X> >

  nodeColors(const X &x)

  {

    dontPrint=true;

    return GraphToEps<NodeColorsTraits<X> >(NodeColorsTraits<X>(*this,x));

  }

  template<class X> struct NodeTextColorsTraits : public T {

    const X &_nodeTextColors;

    NodeTextColorsTraits(const T &t,const X &x) : T(t), _nodeTextColors(x) {}

  };

  ///Sets the map of the node text colors

  ///Sets the map of the node text colors.

  ///\param x must be a node map with \ref Color values.

  ///

  ///\sa Palette

  template<class X> GraphToEps<NodeTextColorsTraits<X> >

  nodeTextColors(const X &x)

  {

    dontPrint=true;

    _nodeTextColorType=CUST_COL;

    return GraphToEps<NodeTextColorsTraits<X> >

      (NodeTextColorsTraits<X>(*this,x));

  }

  template<class X> struct ArcColorsTraits : public T {

    const X &_arcColors;

    ArcColorsTraits(const T &t,const X &x) : T(t), _arcColors(x) {}

  };

  ///Sets the map of the arc colors

  ///Sets the map of the arc colors.

  ///\param x must be an arc map with \ref Color values.

  ///

  ///\sa Palette

  template<class X> GraphToEps<ArcColorsTraits<X> >

  arcColors(const X &x)

  {

    dontPrint=true;

    return GraphToEps<ArcColorsTraits<X> >(ArcColorsTraits<X>(*this,x));

  }

  ///Sets a global scale factor for node sizes

  ///Sets a global scale factor for node sizes.

  ///

  /// If nodeSizes() is not given, this function simply sets the node

  /// sizes to \c d.  If nodeSizes() is given, but

  /// autoNodeScale() is not, then the node size given by

  /// nodeSizes() will be multiplied by the value \c d.

  /// If both nodeSizes() and autoNodeScale() are used, then the

  /// node sizes will be scaled in such a way that the greatest size will be

  /// equal to \c d.

  /// \sa nodeSizes()

  /// \sa autoNodeScale()

  GraphToEps<T> &nodeScale(double d=.01) {_nodeScale=d;return *this;}

  ///Turns on/off the automatic node size scaling.

  ///Turns on/off the automatic node size scaling.

  ///

  ///\sa nodeScale()

  ///

  GraphToEps<T> &autoNodeScale(bool b=true) {

    _autoNodeScale=b;return *this;

  }

  ///Turns on/off the absolutematic node size scaling.

  ///Turns on/off the absolutematic node size scaling.

  ///

  ///\sa nodeScale()

  ///

  GraphToEps<T> &absoluteNodeSizes(bool b=true) {

    _absoluteNodeSizes=b;return *this;

  }

  ///Negates the Y coordinates.

  GraphToEps<T> &negateY(bool b=true) {

    _negY=b;return *this;

  }

  ///Turn on/off pre-scaling

  ///By default graphToEps() rescales the whole image in order to avoid

  ///very big or very small bounding boxes.

  ///

  ///This (p)rescaling can be turned off with this function.

  ///

  GraphToEps<T> &preScale(bool b=true) {

    _preScale=b;return *this;

  }

  ///Sets a global scale factor for arc widths

  /// Sets a global scale factor for arc widths.

  ///

  /// If arcWidths() is not given, this function simply sets the arc

  /// widths to \c d.  If arcWidths() is given, but

  /// autoArcWidthScale() is not, then the arc withs given by

  /// arcWidths() will be multiplied by the value \c d.

  /// If both arcWidths() and autoArcWidthScale() are used, then the

  /// arc withs will be scaled in such a way that the greatest width will be

  /// equal to \c d.

  GraphToEps<T> &arcWidthScale(double d=.003) {_arcWidthScale=d;return *this;}

  ///Turns on/off the automatic arc width scaling.

  ///Turns on/off the automatic arc width scaling.

  ///

  ///\sa arcWidthScale()

  ///

  GraphToEps<T> &autoArcWidthScale(bool b=true) {

    _autoArcWidthScale=b;return *this;

  }

  ///Turns on/off the absolutematic arc width scaling.

  ///Turns on/off the absolutematic arc width scaling.

  ///

  ///\sa arcWidthScale()

  ///

  GraphToEps<T> &absoluteArcWidths(bool b=true) {

    _absoluteArcWidths=b;return *this;

  }

  ///Sets a global scale factor for the whole picture

  GraphToEps<T> &scale(double d) {_scale=d;return *this;}

  ///Sets the width of the border around the picture

  GraphToEps<T> &border(double b=10) {_xBorder=_yBorder=b;return *this;}

  ///Sets the width of the border around the picture

  GraphToEps<T> &border(double x, double y) {

    _xBorder=x;_yBorder=y;return *this;

  }

  ///Sets whether to draw arrows

  GraphToEps<T> &drawArrows(bool b=true) {_drawArrows=b;return *this;}

  ///Sets the length of the arrowheads

  GraphToEps<T> &arrowLength(double d=1.0) {_arrowLength*=d;return *this;}

  ///Sets the width of the arrowheads

  GraphToEps<T> &arrowWidth(double d=.3) {_arrowWidth*=d;return *this;}

  ///Scales the drawing to fit to A4 page

  GraphToEps<T> &scaleToA4() {_scaleToA4=true;return *this;}

  ///Enables parallel arcs

  GraphToEps<T> &enableParallel(bool b=true) {_enableParallel=b;return *this;}

  ///Sets the distance between parallel arcs

  GraphToEps<T> &parArcDist(double d) {_parArcDist*=d;return *this;}

  ///Hides the arcs

  GraphToEps<T> &hideArcs(bool b=true) {_showArcs=!b;return *this;}

  ///Hides the nodes

  GraphToEps<T> &hideNodes(bool b=true) {_showNodes=!b;return *this;}

  ///Sets the size of the node texts

  GraphToEps<T> &nodeTextSize(double d) {_nodeTextSize=d;return *this;}

  ///Sets the color of the node texts to be different from the node color

  ///Sets the color of the node texts to be as different from the node color

  ///as it is possible.

  GraphToEps<T> &distantColorNodeTexts()

  {_nodeTextColorType=DIST_COL;return *this;}

  ///Sets the color of the node texts to be black or white and always visible.

  ///Sets the color of the node texts to be black or white according to

  ///which is more different from the node color.

  GraphToEps<T> &distantBWNodeTexts()

  {_nodeTextColorType=DIST_BW;return *this;}

  ///Gives a preamble block for node Postscript block.

  ///Gives a preamble block for node Postscript block.

  ///

  ///\sa nodePsTexts()

  GraphToEps<T> & nodePsTextsPreamble(const char *str) {

    _nodePsTextsPreamble=str ;return *this;

  }

  ///Sets whether the graph is undirected

  ///Sets whether the graph is undirected.

  ///

  ///This setting is the default for undirected graphs.

  ///

  ///\sa directed()

   GraphToEps<T> &undirected(bool b=true) {_undirected=b;return *this;}

  ///Sets whether the graph is directed

  ///Sets whether the graph is directed.

  ///Use it to show the edges as a pair of directed ones.

  ///

  ///This setting is the default for digraphs.

  ///

  ///\sa undirected()

  GraphToEps<T> &directed(bool b=true) {_undirected=!b;return *this;}

  ///Sets the title.

  ///Sets the title of the generated image,

  ///namely it inserts a <tt>%%Title:</tt> DSC field to the header of

  ///the EPS file.

  GraphToEps<T> &title(const std::string &t) {_title=t;return *this;}

  ///Sets the copyright statement.

  ///Sets the copyright statement of the generated image,

  ///namely it inserts a <tt>%%Copyright:</tt> DSC field to the header of

  ///the EPS file.

  GraphToEps<T> &copyright(const std::string &t) {_copyright=t;return *this;}

protected:

  bool isInsideNode(dim2::Point<double> p, double r,int t)

  {

    switch(t) {

    case CIRCLE:

    case MALE:

    case FEMALE:

      return p.normSquare()<=r*r;

    case SQUARE:

      return p.x<=r&&p.x>=-r&&p.y<=r&&p.y>=-r;

    case DIAMOND:

      return p.x+p.y<=r && p.x-p.y<=r && -p.x+p.y<=r && -p.x-p.y<=r;

    }

    return false;

  }

public:

  ~GraphToEps() { }

  ///Draws the graph.

  ///Like other functions using

  ///\ref named-templ-func-param "named template parameters",

  ///this function calls the algorithm itself, i.e. in this case

  ///it draws the graph.

  void run() {

    const double EPSILON=1e-9;

    if(dontPrint) return;

    _graph_to_eps_bits::_NegY<typename T::CoordsMapType>

      mycoords(_coords,_negY);

    os << "%!PS-Adobe-2.0 EPSF-2.0\n";

    if(_title.size()>0) os << "%%Title: " << _title << '\n';

     if(_copyright.size()>0) os << "%%Copyright: " << _copyright << '\n';

    os << "%%Creator: LEMON, graphToEps()\n";

    {

#ifndef WIN32

      timeval tv;

      gettimeofday(&tv, 0);

      char cbuf[26];

      ctime_r(&tv.tv_sec,cbuf);

      os << "%%CreationDate: " << cbuf;

#else

      SYSTEMTIME time;

      char buf1[11], buf2[9], buf3[5];

      GetSystemTime(&time);

      if (GetDateFormat(LOCALE_USER_DEFAULT, 0, &time,

                        "ddd MMM dd", buf1, 11) &&

          GetTimeFormat(LOCALE_USER_DEFAULT, 0, &time,

                        "HH':'mm':'ss", buf2, 9) &&

          GetDateFormat(LOCALE_USER_DEFAULT, 0, &time,

                                "yyyy", buf3, 5)) {

        os << "%%CreationDate: " << buf1 << ' '

           << buf2 << ' ' << buf3 << std::endl;

      }

#endif

    }

    if (_autoArcWidthScale) {

      double max_w=0;

      for(ArcIt e(g);e!=INVALID;++e)

        max_w=std::max(double(_arcWidths[e]),max_w);

      if(max_w>EPSILON) {

        _arcWidthScale/=max_w;

      }

    }

    if (_autoNodeScale) {

      double max_s=0;

      for(NodeIt n(g);n!=INVALID;++n)

        max_s=std::max(double(_nodeSizes[n]),max_s);

      if(max_s>EPSILON) {

        _nodeScale/=max_s;

      }

    }

    double diag_len = 1;

    if(!(_absoluteNodeSizes&&_absoluteArcWidths)) {

      dim2::Box<double> bb;

      for(NodeIt n(g);n!=INVALID;++n) bb.add(mycoords[n]);

      if (bb.empty()) {

        bb = dim2::Box<double>(dim2::Point<double>(0,0));

      }

      diag_len = std::sqrt((bb.bottomLeft()-bb.topRight()).normSquare());

      if(diag_len<EPSILON) diag_len = 1;

      if(!_absoluteNodeSizes) _nodeScale*=diag_len;

      if(!_absoluteArcWidths) _arcWidthScale*=diag_len;

    }

    dim2::Box<double> bb;

    for(NodeIt n(g);n!=INVALID;++n) {

      double ns=_nodeSizes[n]*_nodeScale;

      dim2::Point<double> p(ns,ns);

      switch(_nodeShapes[n]) {

      case CIRCLE:

      case SQUARE:

      case DIAMOND:

        bb.add(p+mycoords[n]);

        bb.add(-p+mycoords[n]);

        break;

      case MALE:

        bb.add(-p+mycoords[n]);

        bb.add(dim2::Point<double>(1.5*ns,1.5*std::sqrt(3.0)*ns)+mycoords[n]);

        break;

      case FEMALE:

        bb.add(p+mycoords[n]);

        bb.add(dim2::Point<double>(-ns,-3.01*ns)+mycoords[n]);

        break;

      }

    }

    if (bb.empty()) {

      bb = dim2::Box<double>(dim2::Point<double>(0,0));

    }

    if(_scaleToA4)

      os <<"%%BoundingBox: 0 0 596 842\n%%DocumentPaperSizes: a4\n";

    else {

      if(_preScale) {

        //Rescale so that BoundingBox won't be neither to big nor too small.

        while(bb.height()*_scale>1000||bb.width()*_scale>1000) _scale/=10;

        while(bb.height()*_scale<100||bb.width()*_scale<100) _scale*=10;

      }

      os << "%%BoundingBox: "

         << int(floor(bb.left()   * _scale - _xBorder)) << ' '

         << int(floor(bb.bottom() * _scale - _yBorder)) << ' '

         << int(ceil(bb.right()  * _scale + _xBorder)) << ' '

         << int(ceil(bb.top()    * _scale + _yBorder)) << '\n';

    }

    os << "%%EndComments\n";

    //x1 y1 x2 y2 x3 y3 cr cg cb w

    os << "/lb { setlinewidth setrgbcolor newpath moveto\n"

       << "      4 2 roll 1 index 1 index curveto stroke } bind def\n";