lemon/graph_to_eps.h
author Balazs Dezso <deba@google.com>
Tue, 15 May 2018 14:16:35 +0200
changeset 1174 1e5da3fc4fbc
parent 1104 72694bc6916d
permissions -rw-r--r--
Fix PlanarDrawing::run() function (#610)
     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library.
     4  *
     5  * Copyright (C) 2003-2013
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     9  * Permission to use, modify and distribute this software is granted
    10  * provided that this copyright notice appears in all copies. For
    11  * precise terms see the accompanying LICENSE file.
    12  *
    13  * This software is provided "AS IS" with no warranty of any kind,
    14  * express or implied, and with no claim as to its suitability for any
    15  * purpose.
    16  *
    17  */
    18 
    19 #ifndef LEMON_GRAPH_TO_EPS_H
    20 #define LEMON_GRAPH_TO_EPS_H
    21 
    22 #include<iostream>
    23 #include<fstream>
    24 #include<sstream>
    25 #include<algorithm>
    26 #include<vector>
    27 
    28 #ifndef LEMON_WIN32
    29 #include<sys/time.h>
    30 #include<ctime>
    31 #else
    32 #include<lemon/bits/windows.h>
    33 #endif
    34 
    35 #include<lemon/math.h>
    36 #include<lemon/core.h>
    37 #include<lemon/dim2.h>
    38 #include<lemon/maps.h>
    39 #include<lemon/color.h>
    40 #include<lemon/bits/bezier.h>
    41 #include<lemon/error.h>
    42 
    43 
    44 ///\ingroup eps_io
    45 ///\file
    46 ///\brief A well configurable tool for visualizing graphs
    47 
    48 namespace lemon {
    49 
    50   namespace _graph_to_eps_bits {
    51     template<class MT>
    52     class _NegY {
    53     public:
    54       typedef typename MT::Key Key;
    55       typedef typename MT::Value Value;
    56       const MT &map;
    57       int yscale;
    58       _NegY(const MT &m,bool b) : map(m), yscale(1-b*2) {}
    59       Value operator[](Key n) { return Value(map[n].x,map[n].y*yscale);}
    60     };
    61   }
    62 
    63 ///Default traits class of GraphToEps
    64 
    65 ///Default traits class of \ref GraphToEps.
    66 ///
    67 ///\param GR is the type of the underlying graph.
    68 template<class GR>
    69 struct DefaultGraphToEpsTraits
    70 {
    71   typedef GR Graph;
    72   typedef GR Digraph;
    73   typedef typename Graph::Node Node;
    74   typedef typename Graph::NodeIt NodeIt;
    75   typedef typename Graph::Arc Arc;
    76   typedef typename Graph::ArcIt ArcIt;
    77   typedef typename Graph::InArcIt InArcIt;
    78   typedef typename Graph::OutArcIt OutArcIt;
    79 
    80 
    81   const Graph &g;
    82 
    83   std::ostream& os;
    84 
    85   typedef ConstMap<typename Graph::Node,dim2::Point<double> > CoordsMapType;
    86   CoordsMapType _coords;
    87   ConstMap<typename Graph::Node,double > _nodeSizes;
    88   ConstMap<typename Graph::Node,int > _nodeShapes;
    89 
    90   ConstMap<typename Graph::Node,Color > _nodeColors;
    91   ConstMap<typename Graph::Arc,Color > _arcColors;
    92 
    93   ConstMap<typename Graph::Arc,double > _arcWidths;
    94 
    95   double _arcWidthScale;
    96 
    97   double _nodeScale;
    98   double _xBorder, _yBorder;
    99   double _scale;
   100   double _nodeBorderQuotient;
   101 
   102   bool _drawArrows;
   103   double _arrowLength, _arrowWidth;
   104 
   105   bool _showNodes, _showArcs;
   106 
   107   bool _enableParallel;
   108   double _parArcDist;
   109 
   110   bool _showNodeText;
   111   ConstMap<typename Graph::Node,bool > _nodeTexts;
   112   double _nodeTextSize;
   113 
   114   bool _showNodePsText;
   115   ConstMap<typename Graph::Node,bool > _nodePsTexts;
   116   char *_nodePsTextsPreamble;
   117 
   118   bool _undirected;
   119 
   120   bool _pleaseRemoveOsStream;
   121 
   122   bool _scaleToA4;
   123 
   124   std::string _title;
   125   std::string _copyright;
   126 
   127   enum NodeTextColorType
   128     { DIST_COL=0, DIST_BW=1, CUST_COL=2, SAME_COL=3 } _nodeTextColorType;
   129   ConstMap<typename Graph::Node,Color > _nodeTextColors;
   130 
   131   bool _autoNodeScale;
   132   bool _autoArcWidthScale;
   133 
   134   bool _absoluteNodeSizes;
   135   bool _absoluteArcWidths;
   136 
   137   bool _negY;
   138 
   139   bool _preScale;
   140   ///Constructor
   141 
   142   ///Constructor
   143   ///\param gr  Reference to the graph to be printed.
   144   ///\param ost Reference to the output stream.
   145   ///By default, it is <tt>std::cout</tt>.
   146   ///\param pros If it is \c true, then the \c ostream referenced by \c os
   147   ///will be explicitly deallocated by the destructor.
   148   DefaultGraphToEpsTraits(const GR &gr, std::ostream& ost = std::cout,
   149                           bool pros = false) :
   150     g(gr), os(ost),
   151     _coords(dim2::Point<double>(1,1)), _nodeSizes(1), _nodeShapes(0),
   152     _nodeColors(WHITE), _arcColors(BLACK),
   153     _arcWidths(1.0), _arcWidthScale(0.003),
   154     _nodeScale(.01), _xBorder(10), _yBorder(10), _scale(1.0),
   155     _nodeBorderQuotient(.1),
   156     _drawArrows(false), _arrowLength(1), _arrowWidth(0.3),
   157     _showNodes(true), _showArcs(true),
   158     _enableParallel(false), _parArcDist(1),
   159     _showNodeText(false), _nodeTexts(false), _nodeTextSize(1),
   160     _showNodePsText(false), _nodePsTexts(false), _nodePsTextsPreamble(0),
   161     _undirected(lemon::UndirectedTagIndicator<GR>::value),
   162     _pleaseRemoveOsStream(pros), _scaleToA4(false),
   163     _nodeTextColorType(SAME_COL), _nodeTextColors(BLACK),
   164     _autoNodeScale(false),
   165     _autoArcWidthScale(false),
   166     _absoluteNodeSizes(false),
   167     _absoluteArcWidths(false),
   168     _negY(false),
   169     _preScale(true)
   170   {}
   171 };
   172 
   173 ///Auxiliary class to implement the named parameters of \ref graphToEps()
   174 
   175 ///Auxiliary class to implement the named parameters of \ref graphToEps().
   176 ///
   177 ///For detailed examples see the \ref graph_to_eps_demo.cc demo file.
   178 template<class T> class GraphToEps : public T
   179 {
   180   // Can't believe it is required by the C++ standard
   181   using T::g;
   182   using T::os;
   183 
   184   using T::_coords;
   185   using T::_nodeSizes;
   186   using T::_nodeShapes;
   187   using T::_nodeColors;
   188   using T::_arcColors;
   189   using T::_arcWidths;
   190 
   191   using T::_arcWidthScale;
   192   using T::_nodeScale;
   193   using T::_xBorder;
   194   using T::_yBorder;
   195   using T::_scale;
   196   using T::_nodeBorderQuotient;
   197 
   198   using T::_drawArrows;
   199   using T::_arrowLength;
   200   using T::_arrowWidth;
   201 
   202   using T::_showNodes;
   203   using T::_showArcs;
   204 
   205   using T::_enableParallel;
   206   using T::_parArcDist;
   207 
   208   using T::_showNodeText;
   209   using T::_nodeTexts;
   210   using T::_nodeTextSize;
   211 
   212   using T::_showNodePsText;
   213   using T::_nodePsTexts;
   214   using T::_nodePsTextsPreamble;
   215 
   216   using T::_undirected;
   217 
   218   using T::_pleaseRemoveOsStream;
   219 
   220   using T::_scaleToA4;
   221 
   222   using T::_title;
   223   using T::_copyright;
   224 
   225   using T::CUST_COL;
   226   using T::DIST_COL;
   227   using T::DIST_BW;
   228   using T::_nodeTextColorType;
   229   using T::_nodeTextColors;
   230 
   231   using T::_autoNodeScale;
   232   using T::_autoArcWidthScale;
   233 
   234   using T::_absoluteNodeSizes;
   235   using T::_absoluteArcWidths;
   236 
   237 
   238   using T::_negY;
   239   using T::_preScale;
   240 
   241   // dradnats ++C eht yb deriuqer si ti eveileb t'naC
   242 
   243   typedef typename T::Graph Graph;
   244   typedef typename T::Digraph Digraph;
   245   typedef typename Graph::Node Node;
   246   typedef typename Graph::NodeIt NodeIt;
   247   typedef typename Graph::Arc Arc;
   248   typedef typename Graph::ArcIt ArcIt;
   249   typedef typename Graph::InArcIt InArcIt;
   250   typedef typename Graph::OutArcIt OutArcIt;
   251 
   252   static const int INTERPOL_PREC;
   253   static const double A4HEIGHT;
   254   static const double A4WIDTH;
   255   static const double A4BORDER;
   256 
   257   bool dontPrint;
   258 
   259 public:
   260   ///Node shapes
   261 
   262   ///Node shapes.
   263   ///
   264   enum NodeShapes {
   265     /// = 0
   266     ///\image html nodeshape_0.png
   267     ///\image latex nodeshape_0.eps "CIRCLE shape (0)" width=2cm
   268     CIRCLE=0,
   269     /// = 1
   270     ///\image html nodeshape_1.png
   271     ///\image latex nodeshape_1.eps "SQUARE shape (1)" width=2cm
   272     SQUARE=1,
   273     /// = 2
   274     ///\image html nodeshape_2.png
   275     ///\image latex nodeshape_2.eps "DIAMOND shape (2)" width=2cm
   276     DIAMOND=2,
   277     /// = 3
   278     ///\image html nodeshape_3.png
   279     ///\image latex nodeshape_3.eps "MALE shape (3)" width=2cm
   280     MALE=3,
   281     /// = 4
   282     ///\image html nodeshape_4.png
   283     ///\image latex nodeshape_4.eps "FEMALE shape (4)" width=2cm
   284     FEMALE=4
   285   };
   286 
   287 private:
   288   class arcLess {
   289     const Graph &g;
   290   public:
   291     arcLess(const Graph &_g) : g(_g) {}
   292     bool operator()(Arc a,Arc b) const
   293     {
   294       Node ai=std::min(g.source(a),g.target(a));
   295       Node aa=std::max(g.source(a),g.target(a));
   296       Node bi=std::min(g.source(b),g.target(b));
   297       Node ba=std::max(g.source(b),g.target(b));
   298       return ai<bi ||
   299         (ai==bi && (aa < ba ||
   300                     (aa==ba && ai==g.source(a) && bi==g.target(b))));
   301     }
   302   };
   303   bool isParallel(Arc e,Arc f) const
   304   {
   305     return (g.source(e)==g.source(f)&&
   306             g.target(e)==g.target(f)) ||
   307       (g.source(e)==g.target(f)&&
   308        g.target(e)==g.source(f));
   309   }
   310   template<class TT>
   311   static std::string psOut(const dim2::Point<TT> &p)
   312     {
   313       std::ostringstream os;
   314       os << p.x << ' ' << p.y;
   315       return os.str();
   316     }
   317   static std::string psOut(const Color &c)
   318     {
   319       std::ostringstream os;
   320       os << c.red() << ' ' << c.green() << ' ' << c.blue();
   321       return os.str();
   322     }
   323 
   324 public:
   325   GraphToEps(const T &t) : T(t), dontPrint(false) {};
   326 
   327   template<class X> struct CoordsTraits : public T {
   328   typedef X CoordsMapType;
   329     const X &_coords;
   330     CoordsTraits(const T &t,const X &x) : T(t), _coords(x) {}
   331   };
   332   ///Sets the map of the node coordinates
   333 
   334   ///Sets the map of the node coordinates.
   335   ///\param x must be a node map with \ref dim2::Point "dim2::Point<double>" or
   336   ///\ref dim2::Point "dim2::Point<int>" values.
   337   template<class X> GraphToEps<CoordsTraits<X> > coords(const X &x) {
   338     dontPrint=true;
   339     return GraphToEps<CoordsTraits<X> >(CoordsTraits<X>(*this,x));
   340   }
   341   template<class X> struct NodeSizesTraits : public T {
   342     const X &_nodeSizes;
   343     NodeSizesTraits(const T &t,const X &x) : T(t), _nodeSizes(x) {}
   344   };
   345   ///Sets the map of the node sizes
   346 
   347   ///Sets the map of the node sizes.
   348   ///\param x must be a node map with \c double (or convertible) values.
   349   template<class X> GraphToEps<NodeSizesTraits<X> > nodeSizes(const X &x)
   350   {
   351     dontPrint=true;
   352     return GraphToEps<NodeSizesTraits<X> >(NodeSizesTraits<X>(*this,x));
   353   }
   354   template<class X> struct NodeShapesTraits : public T {
   355     const X &_nodeShapes;
   356     NodeShapesTraits(const T &t,const X &x) : T(t), _nodeShapes(x) {}
   357   };
   358   ///Sets the map of the node shapes
   359 
   360   ///Sets the map of the node shapes.
   361   ///The available shape values
   362   ///can be found in \ref NodeShapes "enum NodeShapes".
   363   ///\param x must be a node map with \c int (or convertible) values.
   364   ///\sa NodeShapes
   365   template<class X> GraphToEps<NodeShapesTraits<X> > nodeShapes(const X &x)
   366   {
   367     dontPrint=true;
   368     return GraphToEps<NodeShapesTraits<X> >(NodeShapesTraits<X>(*this,x));
   369   }
   370   template<class X> struct NodeTextsTraits : public T {
   371     const X &_nodeTexts;
   372     NodeTextsTraits(const T &t,const X &x) : T(t), _nodeTexts(x) {}
   373   };
   374   ///Sets the text printed on the nodes
   375 
   376   ///Sets the text printed on the nodes.
   377   ///\param x must be a node map with type that can be pushed to a standard
   378   ///\c ostream.
   379   template<class X> GraphToEps<NodeTextsTraits<X> > nodeTexts(const X &x)
   380   {
   381     dontPrint=true;
   382     _showNodeText=true;
   383     return GraphToEps<NodeTextsTraits<X> >(NodeTextsTraits<X>(*this,x));
   384   }
   385   template<class X> struct NodePsTextsTraits : public T {
   386     const X &_nodePsTexts;
   387     NodePsTextsTraits(const T &t,const X &x) : T(t), _nodePsTexts(x) {}
   388   };
   389   ///Inserts a PostScript block to the nodes
   390 
   391   ///With this command it is possible to insert a verbatim PostScript
   392   ///block to the nodes.
   393   ///The PS current point will be moved to the center of the node before
   394   ///the PostScript block inserted.
   395   ///
   396   ///Before and after the block a newline character is inserted so you
   397   ///don't have to bother with the separators.
   398   ///
   399   ///\param x must be a node map with type that can be pushed to a standard
   400   ///\c ostream.
   401   ///
   402   ///\sa nodePsTextsPreamble()
   403   template<class X> GraphToEps<NodePsTextsTraits<X> > nodePsTexts(const X &x)
   404   {
   405     dontPrint=true;
   406     _showNodePsText=true;
   407     return GraphToEps<NodePsTextsTraits<X> >(NodePsTextsTraits<X>(*this,x));
   408   }
   409   template<class X> struct ArcWidthsTraits : public T {
   410     const X &_arcWidths;
   411     ArcWidthsTraits(const T &t,const X &x) : T(t), _arcWidths(x) {}
   412   };
   413   ///Sets the map of the arc widths
   414 
   415   ///Sets the map of the arc widths.
   416   ///\param x must be an arc map with \c double (or convertible) values.
   417   template<class X> GraphToEps<ArcWidthsTraits<X> > arcWidths(const X &x)
   418   {
   419     dontPrint=true;
   420     return GraphToEps<ArcWidthsTraits<X> >(ArcWidthsTraits<X>(*this,x));
   421   }
   422 
   423   template<class X> struct NodeColorsTraits : public T {
   424     const X &_nodeColors;
   425     NodeColorsTraits(const T &t,const X &x) : T(t), _nodeColors(x) {}
   426   };
   427   ///Sets the map of the node colors
   428 
   429   ///Sets the map of the node colors.
   430   ///\param x must be a node map with \ref Color values.
   431   ///
   432   ///\sa Palette
   433   template<class X> GraphToEps<NodeColorsTraits<X> >
   434   nodeColors(const X &x)
   435   {
   436     dontPrint=true;
   437     return GraphToEps<NodeColorsTraits<X> >(NodeColorsTraits<X>(*this,x));
   438   }
   439   template<class X> struct NodeTextColorsTraits : public T {
   440     const X &_nodeTextColors;
   441     NodeTextColorsTraits(const T &t,const X &x) : T(t), _nodeTextColors(x) {}
   442   };
   443   ///Sets the map of the node text colors
   444 
   445   ///Sets the map of the node text colors.
   446   ///\param x must be a node map with \ref Color values.
   447   ///
   448   ///\sa Palette
   449   template<class X> GraphToEps<NodeTextColorsTraits<X> >
   450   nodeTextColors(const X &x)
   451   {
   452     dontPrint=true;
   453     _nodeTextColorType=CUST_COL;
   454     return GraphToEps<NodeTextColorsTraits<X> >
   455       (NodeTextColorsTraits<X>(*this,x));
   456   }
   457   template<class X> struct ArcColorsTraits : public T {
   458     const X &_arcColors;
   459     ArcColorsTraits(const T &t,const X &x) : T(t), _arcColors(x) {}
   460   };
   461   ///Sets the map of the arc colors
   462 
   463   ///Sets the map of the arc colors.
   464   ///\param x must be an arc map with \ref Color values.
   465   ///
   466   ///\sa Palette
   467   template<class X> GraphToEps<ArcColorsTraits<X> >
   468   arcColors(const X &x)
   469   {
   470     dontPrint=true;
   471     return GraphToEps<ArcColorsTraits<X> >(ArcColorsTraits<X>(*this,x));
   472   }
   473   ///Sets a global scale factor for node sizes
   474 
   475   ///Sets a global scale factor for node sizes.
   476   ///
   477   /// If nodeSizes() is not given, this function simply sets the node
   478   /// sizes to \c d.  If nodeSizes() is given, but
   479   /// autoNodeScale() is not, then the node size given by
   480   /// nodeSizes() will be multiplied by the value \c d.
   481   /// If both nodeSizes() and autoNodeScale() are used, then the
   482   /// node sizes will be scaled in such a way that the greatest size will be
   483   /// equal to \c d.
   484   /// \sa nodeSizes()
   485   /// \sa autoNodeScale()
   486   GraphToEps<T> &nodeScale(double d=.01) {_nodeScale=d;return *this;}
   487   ///Turns on/off the automatic node size scaling.
   488 
   489   ///Turns on/off the automatic node size scaling.
   490   ///
   491   ///\sa nodeScale()
   492   ///
   493   GraphToEps<T> &autoNodeScale(bool b=true) {
   494     _autoNodeScale=b;return *this;
   495   }
   496 
   497   ///Turns on/off the absolutematic node size scaling.
   498 
   499   ///Turns on/off the absolutematic node size scaling.
   500   ///
   501   ///\sa nodeScale()
   502   ///
   503   GraphToEps<T> &absoluteNodeSizes(bool b=true) {
   504     _absoluteNodeSizes=b;return *this;
   505   }
   506 
   507   ///Negates the Y coordinates.
   508   GraphToEps<T> &negateY(bool b=true) {
   509     _negY=b;return *this;
   510   }
   511 
   512   ///Turn on/off pre-scaling
   513 
   514   ///By default, graphToEps() rescales the whole image in order to avoid
   515   ///very big or very small bounding boxes.
   516   ///
   517   ///This (p)rescaling can be turned off with this function.
   518   ///
   519   GraphToEps<T> &preScale(bool b=true) {
   520     _preScale=b;return *this;
   521   }
   522 
   523   ///Sets a global scale factor for arc widths
   524 
   525   /// Sets a global scale factor for arc widths.
   526   ///
   527   /// If arcWidths() is not given, this function simply sets the arc
   528   /// widths to \c d.  If arcWidths() is given, but
   529   /// autoArcWidthScale() is not, then the arc withs given by
   530   /// arcWidths() will be multiplied by the value \c d.
   531   /// If both arcWidths() and autoArcWidthScale() are used, then the
   532   /// arc withs will be scaled in such a way that the greatest width will be
   533   /// equal to \c d.
   534   GraphToEps<T> &arcWidthScale(double d=.003) {_arcWidthScale=d;return *this;}
   535   ///Turns on/off the automatic arc width scaling.
   536 
   537   ///Turns on/off the automatic arc width scaling.
   538   ///
   539   ///\sa arcWidthScale()
   540   ///
   541   GraphToEps<T> &autoArcWidthScale(bool b=true) {
   542     _autoArcWidthScale=b;return *this;
   543   }
   544   ///Turns on/off the absolutematic arc width scaling.
   545 
   546   ///Turns on/off the absolutematic arc width scaling.
   547   ///
   548   ///\sa arcWidthScale()
   549   ///
   550   GraphToEps<T> &absoluteArcWidths(bool b=true) {
   551     _absoluteArcWidths=b;return *this;
   552   }
   553   ///Sets a global scale factor for the whole picture
   554   GraphToEps<T> &scale(double d) {_scale=d;return *this;}
   555   ///Sets the width of the border around the picture
   556   GraphToEps<T> &border(double b=10) {_xBorder=_yBorder=b;return *this;}
   557   ///Sets the width of the border around the picture
   558   GraphToEps<T> &border(double x, double y) {
   559     _xBorder=x;_yBorder=y;return *this;
   560   }
   561   ///Sets whether to draw arrows
   562   GraphToEps<T> &drawArrows(bool b=true) {_drawArrows=b;return *this;}
   563   ///Sets the length of the arrowheads
   564   GraphToEps<T> &arrowLength(double d=1.0) {_arrowLength*=d;return *this;}
   565   ///Sets the width of the arrowheads
   566   GraphToEps<T> &arrowWidth(double d=.3) {_arrowWidth*=d;return *this;}
   567 
   568   ///Scales the drawing to fit to A4 page
   569   GraphToEps<T> &scaleToA4() {_scaleToA4=true;return *this;}
   570 
   571   ///Enables parallel arcs
   572   GraphToEps<T> &enableParallel(bool b=true) {_enableParallel=b;return *this;}
   573 
   574   ///Sets the distance between parallel arcs
   575   GraphToEps<T> &parArcDist(double d) {_parArcDist*=d;return *this;}
   576 
   577   ///Hides the arcs
   578   GraphToEps<T> &hideArcs(bool b=true) {_showArcs=!b;return *this;}
   579   ///Hides the nodes
   580   GraphToEps<T> &hideNodes(bool b=true) {_showNodes=!b;return *this;}
   581 
   582   ///Sets the size of the node texts
   583   GraphToEps<T> &nodeTextSize(double d) {_nodeTextSize=d;return *this;}
   584 
   585   ///Sets the color of the node texts to be different from the node color
   586 
   587   ///Sets the color of the node texts to be as different from the node color
   588   ///as it is possible.
   589   GraphToEps<T> &distantColorNodeTexts()
   590   {_nodeTextColorType=DIST_COL;return *this;}
   591   ///Sets the color of the node texts to be black or white and always visible.
   592 
   593   ///Sets the color of the node texts to be black or white according to
   594   ///which is more different from the node color.
   595   GraphToEps<T> &distantBWNodeTexts()
   596   {_nodeTextColorType=DIST_BW;return *this;}
   597 
   598   ///Gives a preamble block for node Postscript block.
   599 
   600   ///Gives a preamble block for node Postscript block.
   601   ///
   602   ///\sa nodePsTexts()
   603   GraphToEps<T> & nodePsTextsPreamble(const char *str) {
   604     _nodePsTextsPreamble=str ;return *this;
   605   }
   606   ///Sets whether the graph is undirected
   607 
   608   ///Sets whether the graph is undirected.
   609   ///
   610   ///This setting is the default for undirected graphs.
   611   ///
   612   ///\sa directed()
   613    GraphToEps<T> &undirected(bool b=true) {_undirected=b;return *this;}
   614 
   615   ///Sets whether the graph is directed
   616 
   617   ///Sets whether the graph is directed.
   618   ///Use it to show the edges as a pair of directed ones.
   619   ///
   620   ///This setting is the default for digraphs.
   621   ///
   622   ///\sa undirected()
   623   GraphToEps<T> &directed(bool b=true) {_undirected=!b;return *this;}
   624 
   625   ///Sets the title.
   626 
   627   ///Sets the title of the generated image,
   628   ///namely it inserts a <tt>%%Title:</tt> DSC field to the header of
   629   ///the EPS file.
   630   GraphToEps<T> &title(const std::string &t) {_title=t;return *this;}
   631   ///Sets the copyright statement.
   632 
   633   ///Sets the copyright statement of the generated image,
   634   ///namely it inserts a <tt>%%Copyright:</tt> DSC field to the header of
   635   ///the EPS file.
   636   GraphToEps<T> &copyright(const std::string &t) {_copyright=t;return *this;}
   637 
   638 protected:
   639   bool isInsideNode(dim2::Point<double> p, double r,int t)
   640   {
   641     switch(t) {
   642     case CIRCLE:
   643     case MALE:
   644     case FEMALE:
   645       return p.normSquare()<=r*r;
   646     case SQUARE:
   647       return p.x<=r&&p.x>=-r&&p.y<=r&&p.y>=-r;
   648     case DIAMOND:
   649       return p.x+p.y<=r && p.x-p.y<=r && -p.x+p.y<=r && -p.x-p.y<=r;
   650     }
   651     return false;
   652   }
   653 
   654 public:
   655   ~GraphToEps() { }
   656 
   657   ///Draws the graph.
   658 
   659   ///Like other functions using
   660   ///\ref named-templ-func-param "named template parameters",
   661   ///this function calls the algorithm itself, i.e. in this case
   662   ///it draws the graph.
   663   void run() {
   664     const double EPSILON=1e-9;
   665     if(dontPrint) return;
   666 
   667     _graph_to_eps_bits::_NegY<typename T::CoordsMapType>
   668       mycoords(_coords,_negY);
   669 
   670     os << "%!PS-Adobe-2.0 EPSF-2.0\n";
   671     if(_title.size()>0) os << "%%Title: " << _title << '\n';
   672      if(_copyright.size()>0) os << "%%Copyright: " << _copyright << '\n';
   673     os << "%%Creator: LEMON, graphToEps()\n";
   674 
   675     {
   676       os << "%%CreationDate: ";
   677 #ifndef LEMON_WIN32
   678       timeval tv;
   679       gettimeofday(&tv, 0);
   680 
   681       char cbuf[26];
   682       ctime_r(&tv.tv_sec,cbuf);
   683       os << cbuf;
   684 #else
   685       os << bits::getWinFormattedDate();
   686       os << std::endl;
   687 #endif
   688     }
   689 
   690     if (_autoArcWidthScale) {
   691       double max_w=0;
   692       for(ArcIt e(g);e!=INVALID;++e)
   693         max_w=std::max(double(_arcWidths[e]),max_w);
   694       if(max_w>EPSILON) {
   695         _arcWidthScale/=max_w;
   696       }
   697     }
   698 
   699     if (_autoNodeScale) {
   700       double max_s=0;
   701       for(NodeIt n(g);n!=INVALID;++n)
   702         max_s=std::max(double(_nodeSizes[n]),max_s);
   703       if(max_s>EPSILON) {
   704         _nodeScale/=max_s;
   705       }
   706     }
   707 
   708     double diag_len = 1;
   709     if(!(_absoluteNodeSizes&&_absoluteArcWidths)) {
   710       dim2::Box<double> bb;
   711       for(NodeIt n(g);n!=INVALID;++n) bb.add(mycoords[n]);
   712       if (bb.empty()) {
   713         bb = dim2::Box<double>(dim2::Point<double>(0,0));
   714       }
   715       diag_len = std::sqrt((bb.bottomLeft()-bb.topRight()).normSquare());
   716       if(diag_len<EPSILON) diag_len = 1;
   717       if(!_absoluteNodeSizes) _nodeScale*=diag_len;
   718       if(!_absoluteArcWidths) _arcWidthScale*=diag_len;
   719     }
   720 
   721     dim2::Box<double> bb;
   722     for(NodeIt n(g);n!=INVALID;++n) {
   723       double ns=_nodeSizes[n]*_nodeScale;
   724       dim2::Point<double> p(ns,ns);
   725       switch(_nodeShapes[n]) {
   726       case CIRCLE:
   727       case SQUARE:
   728       case DIAMOND:
   729         bb.add(p+mycoords[n]);
   730         bb.add(-p+mycoords[n]);
   731         break;
   732       case MALE:
   733         bb.add(-p+mycoords[n]);
   734         bb.add(dim2::Point<double>(1.5*ns,1.5*std::sqrt(3.0)*ns)+mycoords[n]);
   735         break;
   736       case FEMALE:
   737         bb.add(p+mycoords[n]);
   738         bb.add(dim2::Point<double>(-ns,-3.01*ns)+mycoords[n]);
   739         break;
   740       }
   741     }
   742     if (bb.empty()) {
   743       bb = dim2::Box<double>(dim2::Point<double>(0,0));
   744     }
   745 
   746     if(_scaleToA4)
   747       os <<"%%BoundingBox: 0 0 596 842\n%%DocumentPaperSizes: a4\n";
   748     else {
   749       if(_preScale) {
   750         //Rescale so that BoundingBox won't be neither to big nor too small.
   751         while(bb.height()*_scale>1000||bb.width()*_scale>1000) _scale/=10;
   752         while(bb.height()*_scale<100||bb.width()*_scale<100) _scale*=10;
   753       }
   754 
   755       os << "%%BoundingBox: "
   756          << int(floor(bb.left()   * _scale - _xBorder)) << ' '
   757          << int(floor(bb.bottom() * _scale - _yBorder)) << ' '
   758          << int(ceil(bb.right()  * _scale + _xBorder)) << ' '
   759          << int(ceil(bb.top()    * _scale + _yBorder)) << '\n';
   760     }
   761 
   762     os << "%%EndComments\n";
   763 
   764     //x1 y1 x2 y2 x3 y3 cr cg cb w
   765     os << "/lb { setlinewidth setrgbcolor newpath moveto\n"
   766        << "      4 2 roll 1 index 1 index curveto stroke } bind def\n";
   767     os << "/l { setlinewidth setrgbcolor newpath moveto lineto stroke }"
   768        << " bind def\n";
   769     //x y r
   770     os << "/c { newpath dup 3 index add 2 index moveto 0 360 arc closepath }"
   771        << " bind def\n";
   772     //x y r
   773     os << "/sq { newpath 2 index 1 index add 2 index 2 index add moveto\n"
   774        << "      2 index 1 index sub 2 index 2 index add lineto\n"
   775        << "      2 index 1 index sub 2 index 2 index sub lineto\n"
   776        << "      2 index 1 index add 2 index 2 index sub lineto\n"
   777        << "      closepath pop pop pop} bind def\n";
   778     //x y r
   779     os << "/di { newpath 2 index 1 index add 2 index moveto\n"
   780        << "      2 index             2 index 2 index add lineto\n"
   781        << "      2 index 1 index sub 2 index             lineto\n"
   782        << "      2 index             2 index 2 index sub lineto\n"
   783        << "      closepath pop pop pop} bind def\n";
   784     // x y r cr cg cb
   785     os << "/nc { 0 0 0 setrgbcolor 5 index 5 index 5 index c fill\n"
   786        << "     setrgbcolor " << 1+_nodeBorderQuotient << " div c fill\n"
   787        << "   } bind def\n";
   788     os << "/nsq { 0 0 0 setrgbcolor 5 index 5 index 5 index sq fill\n"
   789        << "     setrgbcolor " << 1+_nodeBorderQuotient << " div sq fill\n"
   790        << "   } bind def\n";
   791     os << "/ndi { 0 0 0 setrgbcolor 5 index 5 index 5 index di fill\n"
   792        << "     setrgbcolor " << 1+_nodeBorderQuotient << " div di fill\n"
   793        << "   } bind def\n";
   794     os << "/nfemale { 0 0 0 setrgbcolor 3 index "
   795        << _nodeBorderQuotient/(1+_nodeBorderQuotient)
   796        << " 1.5 mul mul setlinewidth\n"
   797        << "  newpath 5 index 5 index moveto "
   798        << "5 index 5 index 5 index 3.01 mul sub\n"
   799        << "  lineto 5 index 4 index .7 mul sub 5 index 5 index 2.2 mul sub"
   800        << " moveto\n"
   801        << "  5 index 4 index .7 mul add 5 index 5 index 2.2 mul sub lineto "
   802        << "stroke\n"
   803        << "  5 index 5 index 5 index c fill\n"
   804        << "  setrgbcolor " << 1+_nodeBorderQuotient << " div c fill\n"
   805        << "  } bind def\n";
   806     os << "/nmale {\n"
   807        << "  0 0 0 setrgbcolor 3 index "
   808        << _nodeBorderQuotient/(1+_nodeBorderQuotient)
   809        <<" 1.5 mul mul setlinewidth\n"
   810        << "  newpath 5 index 5 index moveto\n"
   811        << "  5 index 4 index 1 mul 1.5 mul add\n"
   812        << "  5 index 5 index 3 sqrt 1.5 mul mul add\n"
   813        << "  1 index 1 index lineto\n"
   814        << "  1 index 1 index 7 index sub moveto\n"
   815        << "  1 index 1 index lineto\n"
   816        << "  exch 5 index 3 sqrt .5 mul mul sub exch 5 index .5 mul sub"
   817        << " lineto\n"
   818        << "  stroke\n"
   819        << "  5 index 5 index 5 index c fill\n"
   820        << "  setrgbcolor " << 1+_nodeBorderQuotient << " div c fill\n"
   821        << "  } bind def\n";
   822 
   823 
   824     os << "/arrl " << _arrowLength << " def\n";
   825     os << "/arrw " << _arrowWidth << " def\n";
   826     // l dx_norm dy_norm
   827     os << "/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def\n";
   828     //len w dx_norm dy_norm x1 y1 cr cg cb
   829     os << "/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx "
   830        << "exch def\n"
   831        << "       /w exch def /len exch def\n"
   832       //<< "0.1 setlinewidth x1 y1 moveto dx len mul dy len mul rlineto stroke"
   833        << "       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto\n"
   834        << "       len w sub arrl sub dx dy lrl\n"
   835        << "       arrw dy dx neg lrl\n"
   836        << "       dx arrl w add mul dy w 2 div arrw add mul sub\n"
   837        << "       dy arrl w add mul dx w 2 div arrw add mul add rlineto\n"
   838        << "       dx arrl w add mul neg dy w 2 div arrw add mul sub\n"
   839        << "       dy arrl w add mul neg dx w 2 div arrw add mul add rlineto\n"
   840        << "       arrw dy dx neg lrl\n"
   841        << "       len w sub arrl sub neg dx dy lrl\n"
   842        << "       closepath fill } bind def\n";
   843     os << "/cshow { 2 index 2 index moveto dup stringwidth pop\n"
   844        << "         neg 2 div fosi .35 mul neg rmoveto show pop pop} def\n";
   845 
   846     os << "\ngsave\n";
   847     if(_scaleToA4)
   848       if(bb.height()>bb.width()) {
   849         double sc= std::min((A4HEIGHT-2*A4BORDER)/bb.height(),
   850                   (A4WIDTH-2*A4BORDER)/bb.width());
   851         os << ((A4WIDTH -2*A4BORDER)-sc*bb.width())/2 + A4BORDER << ' '
   852            << ((A4HEIGHT-2*A4BORDER)-sc*bb.height())/2 + A4BORDER
   853            << " translate\n"
   854            << sc << " dup scale\n"
   855            << -bb.left() << ' ' << -bb.bottom() << " translate\n";
   856       }
   857       else {
   858         double sc= std::min((A4HEIGHT-2*A4BORDER)/bb.width(),
   859                   (A4WIDTH-2*A4BORDER)/bb.height());
   860         os << ((A4WIDTH -2*A4BORDER)-sc*bb.height())/2 + A4BORDER << ' '
   861            << ((A4HEIGHT-2*A4BORDER)-sc*bb.width())/2 + A4BORDER
   862            << " translate\n"
   863            << sc << " dup scale\n90 rotate\n"
   864            << -bb.left() << ' ' << -bb.top() << " translate\n";
   865         }
   866     else if(_scale!=1.0) os << _scale << " dup scale\n";
   867 
   868     if(_showArcs) {
   869       os << "%Arcs:\ngsave\n";
   870       if(_enableParallel) {
   871         std::vector<Arc> el;
   872         for(ArcIt e(g);e!=INVALID;++e)
   873           if((!_undirected||g.source(e)<g.target(e))&&_arcWidths[e]>0
   874              &&g.source(e)!=g.target(e))
   875             el.push_back(e);
   876         std::sort(el.begin(),el.end(),arcLess(g));
   877 
   878         typename std::vector<Arc>::iterator j;
   879         for(typename std::vector<Arc>::iterator i=el.begin();i!=el.end();i=j) {
   880           for(j=i+1;j!=el.end()&&isParallel(*i,*j);++j) ;
   881 
   882           double sw=0;
   883           for(typename std::vector<Arc>::iterator e=i;e!=j;++e)
   884             sw+=_arcWidths[*e]*_arcWidthScale+_parArcDist;
   885           sw-=_parArcDist;
   886           sw/=-2.0;
   887           dim2::Point<double>
   888             dvec(mycoords[g.target(*i)]-mycoords[g.source(*i)]);
   889           double l=std::sqrt(dvec.normSquare());
   890           dim2::Point<double> d(dvec/std::max(l,EPSILON));
   891           dim2::Point<double> m;
   892 //           m=dim2::Point<double>(mycoords[g.target(*i)]+
   893 //                                 mycoords[g.source(*i)])/2.0;
   894 
   895 //            m=dim2::Point<double>(mycoords[g.source(*i)])+
   896 //             dvec*(double(_nodeSizes[g.source(*i)])/
   897 //                (_nodeSizes[g.source(*i)]+_nodeSizes[g.target(*i)]));
   898 
   899           m=dim2::Point<double>(mycoords[g.source(*i)])+
   900             d*(l+_nodeSizes[g.source(*i)]-_nodeSizes[g.target(*i)])/2.0;
   901 
   902           for(typename std::vector<Arc>::iterator e=i;e!=j;++e) {
   903             sw+=_arcWidths[*e]*_arcWidthScale/2.0;
   904             dim2::Point<double> mm=m+rot90(d)*sw/.75;
   905             if(_drawArrows) {
   906               int node_shape;
   907               dim2::Point<double> s=mycoords[g.source(*e)];
   908               dim2::Point<double> t=mycoords[g.target(*e)];
   909               double rn=_nodeSizes[g.target(*e)]*_nodeScale;
   910               node_shape=_nodeShapes[g.target(*e)];
   911               dim2::Bezier3 bez(s,mm,mm,t);
   912               double t1=0,t2=1;
   913               for(int ii=0;ii<INTERPOL_PREC;++ii)
   914                 if(isInsideNode(bez((t1+t2)/2)-t,rn,node_shape)) t2=(t1+t2)/2;
   915                 else t1=(t1+t2)/2;
   916               dim2::Point<double> apoint=bez((t1+t2)/2);
   917               rn = _arrowLength+_arcWidths[*e]*_arcWidthScale;
   918               rn*=rn;
   919               t2=(t1+t2)/2;t1=0;
   920               for(int ii=0;ii<INTERPOL_PREC;++ii)
   921                 if((bez((t1+t2)/2)-apoint).normSquare()>rn) t1=(t1+t2)/2;
   922                 else t2=(t1+t2)/2;
   923               dim2::Point<double> linend=bez((t1+t2)/2);
   924               bez=bez.before((t1+t2)/2);
   925 //               rn=_nodeSizes[g.source(*e)]*_nodeScale;
   926 //               node_shape=_nodeShapes[g.source(*e)];
   927 //               t1=0;t2=1;
   928 //               for(int i=0;i<INTERPOL_PREC;++i)
   929 //                 if(isInsideNode(bez((t1+t2)/2)-t,rn,node_shape))
   930 //                   t1=(t1+t2)/2;
   931 //                 else t2=(t1+t2)/2;
   932 //               bez=bez.after((t1+t2)/2);
   933               os << _arcWidths[*e]*_arcWidthScale << " setlinewidth "
   934                  << _arcColors[*e].red() << ' '
   935                  << _arcColors[*e].green() << ' '
   936                  << _arcColors[*e].blue() << " setrgbcolor newpath\n"
   937                  << bez.p1.x << ' ' <<  bez.p1.y << " moveto\n"
   938                  << bez.p2.x << ' ' << bez.p2.y << ' '
   939                  << bez.p3.x << ' ' << bez.p3.y << ' '
   940                  << bez.p4.x << ' ' << bez.p4.y << " curveto stroke\n";
   941               dim2::Point<double> dd(rot90(linend-apoint));
   942               dd*=(.5*_arcWidths[*e]*_arcWidthScale+_arrowWidth)/
   943                 std::sqrt(dd.normSquare());
   944               os << "newpath " << psOut(apoint) << " moveto "
   945                  << psOut(linend+dd) << " lineto "
   946                  << psOut(linend-dd) << " lineto closepath fill\n";
   947             }
   948             else {
   949               os << mycoords[g.source(*e)].x << ' '
   950                  << mycoords[g.source(*e)].y << ' '
   951                  << mm.x << ' ' << mm.y << ' '
   952                  << mycoords[g.target(*e)].x << ' '
   953                  << mycoords[g.target(*e)].y << ' '
   954                  << _arcColors[*e].red() << ' '
   955                  << _arcColors[*e].green() << ' '
   956                  << _arcColors[*e].blue() << ' '
   957                  << _arcWidths[*e]*_arcWidthScale << " lb\n";
   958             }
   959             sw+=_arcWidths[*e]*_arcWidthScale/2.0+_parArcDist;
   960           }
   961         }
   962       }
   963       else for(ArcIt e(g);e!=INVALID;++e)
   964         if((!_undirected||g.source(e)<g.target(e))&&_arcWidths[e]>0
   965            &&g.source(e)!=g.target(e)) {
   966           if(_drawArrows) {
   967             dim2::Point<double> d(mycoords[g.target(e)]-mycoords[g.source(e)]);
   968             double rn=_nodeSizes[g.target(e)]*_nodeScale;
   969             int node_shape=_nodeShapes[g.target(e)];
   970             double t1=0,t2=1;
   971             for(int i=0;i<INTERPOL_PREC;++i)
   972               if(isInsideNode((-(t1+t2)/2)*d,rn,node_shape)) t1=(t1+t2)/2;
   973               else t2=(t1+t2)/2;
   974             double l=std::sqrt(d.normSquare());
   975             d/=l;
   976 
   977             os << l*(1-(t1+t2)/2) << ' '
   978                << _arcWidths[e]*_arcWidthScale << ' '
   979                << d.x << ' ' << d.y << ' '
   980                << mycoords[g.source(e)].x << ' '
   981                << mycoords[g.source(e)].y << ' '
   982                << _arcColors[e].red() << ' '
   983                << _arcColors[e].green() << ' '
   984                << _arcColors[e].blue() << " arr\n";
   985           }
   986           else os << mycoords[g.source(e)].x << ' '
   987                   << mycoords[g.source(e)].y << ' '
   988                   << mycoords[g.target(e)].x << ' '
   989                   << mycoords[g.target(e)].y << ' '
   990                   << _arcColors[e].red() << ' '
   991                   << _arcColors[e].green() << ' '
   992                   << _arcColors[e].blue() << ' '
   993                   << _arcWidths[e]*_arcWidthScale << " l\n";
   994         }
   995       os << "grestore\n";
   996     }
   997     if(_showNodes) {
   998       os << "%Nodes:\ngsave\n";
   999       for(NodeIt n(g);n!=INVALID;++n) {
  1000         os << mycoords[n].x << ' ' << mycoords[n].y << ' '
  1001            << _nodeSizes[n]*_nodeScale << ' '
  1002            << _nodeColors[n].red() << ' '
  1003            << _nodeColors[n].green() << ' '
  1004            << _nodeColors[n].blue() << ' ';
  1005         switch(_nodeShapes[n]) {
  1006         case CIRCLE:
  1007           os<< "nc";break;
  1008         case SQUARE:
  1009           os<< "nsq";break;
  1010         case DIAMOND:
  1011           os<< "ndi";break;
  1012         case MALE:
  1013           os<< "nmale";break;
  1014         case FEMALE:
  1015           os<< "nfemale";break;
  1016         }
  1017         os<<'\n';
  1018       }
  1019       os << "grestore\n";
  1020     }
  1021     if(_showNodeText) {
  1022       os << "%Node texts:\ngsave\n";
  1023       os << "/fosi " << _nodeTextSize << " def\n";
  1024       os << "(Helvetica) findfont fosi scalefont setfont\n";
  1025       for(NodeIt n(g);n!=INVALID;++n) {
  1026         switch(_nodeTextColorType) {
  1027         case DIST_COL:
  1028           os << psOut(distantColor(_nodeColors[n])) << " setrgbcolor\n";
  1029           break;
  1030         case DIST_BW:
  1031           os << psOut(distantBW(_nodeColors[n])) << " setrgbcolor\n";
  1032           break;
  1033         case CUST_COL:
  1034           os << psOut(distantColor(_nodeTextColors[n])) << " setrgbcolor\n";
  1035           break;
  1036         default:
  1037           os << "0 0 0 setrgbcolor\n";
  1038         }
  1039         os << mycoords[n].x << ' ' << mycoords[n].y
  1040            << " (" << _nodeTexts[n] << ") cshow\n";
  1041       }
  1042       os << "grestore\n";
  1043     }
  1044     if(_showNodePsText) {
  1045       os << "%Node PS blocks:\ngsave\n";
  1046       for(NodeIt n(g);n!=INVALID;++n)
  1047         os << mycoords[n].x << ' ' << mycoords[n].y
  1048            << " moveto\n" << _nodePsTexts[n] << "\n";
  1049       os << "grestore\n";
  1050     }
  1051 
  1052     os << "grestore\nshowpage\n";
  1053 
  1054     //CleanUp:
  1055     if(_pleaseRemoveOsStream) {delete &os;}
  1056   }
  1057 
  1058   ///\name Aliases
  1059   ///These are just some aliases to other parameter setting functions.
  1060 
  1061   ///@{
  1062 
  1063   ///An alias for arcWidths()
  1064   template<class X> GraphToEps<ArcWidthsTraits<X> > edgeWidths(const X &x)
  1065   {
  1066     return arcWidths(x);
  1067   }
  1068 
  1069   ///An alias for arcColors()
  1070   template<class X> GraphToEps<ArcColorsTraits<X> >
  1071   edgeColors(const X &x)
  1072   {
  1073     return arcColors(x);
  1074   }
  1075 
  1076   ///An alias for arcWidthScale()
  1077   GraphToEps<T> &edgeWidthScale(double d) {return arcWidthScale(d);}
  1078 
  1079   ///An alias for autoArcWidthScale()
  1080   GraphToEps<T> &autoEdgeWidthScale(bool b=true)
  1081   {
  1082     return autoArcWidthScale(b);
  1083   }
  1084 
  1085   ///An alias for absoluteArcWidths()
  1086   GraphToEps<T> &absoluteEdgeWidths(bool b=true)
  1087   {
  1088     return absoluteArcWidths(b);
  1089   }
  1090 
  1091   ///An alias for parArcDist()
  1092   GraphToEps<T> &parEdgeDist(double d) {return parArcDist(d);}
  1093 
  1094   ///An alias for hideArcs()
  1095   GraphToEps<T> &hideEdges(bool b=true) {return hideArcs(b);}
  1096 
  1097   ///@}
  1098 };
  1099 
  1100 template<class T>
  1101 const int GraphToEps<T>::INTERPOL_PREC = 20;
  1102 template<class T>
  1103 const double GraphToEps<T>::A4HEIGHT = 841.8897637795276;
  1104 template<class T>
  1105 const double GraphToEps<T>::A4WIDTH  = 595.275590551181;
  1106 template<class T>
  1107 const double GraphToEps<T>::A4BORDER = 15;
  1108 
  1109 
  1110 ///Generates an EPS file from a graph
  1111 
  1112 ///\ingroup eps_io
  1113 ///Generates an EPS file from a graph.
  1114 ///\param g Reference to the graph to be printed.
  1115 ///\param os Reference to the output stream.
  1116 ///By default, it is <tt>std::cout</tt>.
  1117 ///
  1118 ///This function also has a lot of
  1119 ///\ref named-templ-func-param "named parameters",
  1120 ///they are declared as the members of class \ref GraphToEps. The following
  1121 ///example shows how to use these parameters.
  1122 ///\code
  1123 /// graphToEps(g,os).scale(10).coords(coords)
  1124 ///              .nodeScale(2).nodeSizes(sizes)
  1125 ///              .arcWidthScale(.4).run();
  1126 ///\endcode
  1127 ///
  1128 ///For more detailed examples, see the \ref graph_to_eps_demo.cc demo file.
  1129 ///
  1130 ///\warning Don't forget to put the \ref GraphToEps::run() "run()"
  1131 ///to the end of the parameter list.
  1132 ///\sa GraphToEps
  1133 ///\sa graphToEps(GR &g, const char *file_name)
  1134 template<class GR>
  1135 GraphToEps<DefaultGraphToEpsTraits<GR> >
  1136 graphToEps(GR &g, std::ostream& os=std::cout)
  1137 {
  1138   return
  1139     GraphToEps<DefaultGraphToEpsTraits<GR> >(DefaultGraphToEpsTraits<GR>(g,os));
  1140 }
  1141 
  1142 ///Generates an EPS file from a graph
  1143 
  1144 ///\ingroup eps_io
  1145 ///This function does the same as
  1146 ///\ref graphToEps(GR &g,std::ostream& os)
  1147 ///but it writes its output into the file \c file_name
  1148 ///instead of a stream.
  1149 ///\sa graphToEps(GR &g, std::ostream& os)
  1150 template<class GR>
  1151 GraphToEps<DefaultGraphToEpsTraits<GR> >
  1152 graphToEps(GR &g,const char *file_name)
  1153 {
  1154   std::ostream* os = new std::ofstream(file_name);
  1155   if (!(*os)) {
  1156     delete os;
  1157     throw IoError("Cannot write file", file_name);
  1158   }
  1159   return GraphToEps<DefaultGraphToEpsTraits<GR> >
  1160     (DefaultGraphToEpsTraits<GR>(g,*os,true));
  1161 }
  1162 
  1163 ///Generates an EPS file from a graph
  1164 
  1165 ///\ingroup eps_io
  1166 ///This function does the same as
  1167 ///\ref graphToEps(GR &g,std::ostream& os)
  1168 ///but it writes its output into the file \c file_name
  1169 ///instead of a stream.
  1170 ///\sa graphToEps(GR &g, std::ostream& os)
  1171 template<class GR>
  1172 GraphToEps<DefaultGraphToEpsTraits<GR> >
  1173 graphToEps(GR &g,const std::string& file_name)
  1174 {
  1175   std::ostream* os = new std::ofstream(file_name.c_str());
  1176   if (!(*os)) {
  1177     delete os;
  1178     throw IoError("Cannot write file", file_name);
  1179   }
  1180   return GraphToEps<DefaultGraphToEpsTraits<GR> >
  1181     (DefaultGraphToEpsTraits<GR>(g,*os,true));
  1182 }
  1183 
  1184 } //END OF NAMESPACE LEMON
  1185 
  1186 #endif // LEMON_GRAPH_TO_EPS_H