alpar@1073: /* -*- C++ -*-
alpar@1073:  * src/lemon/graph_to_eps.h - Part of LEMON, a generic C++ optimization library
alpar@1073:  *
alpar@1073:  * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
alpar@1073:  * (Egervary Combinatorial Optimization Research Group, EGRES).
alpar@1073:  *
alpar@1073:  * Permission to use, modify and distribute this software is granted
alpar@1073:  * provided that this copyright notice appears in all copies. For
alpar@1073:  * precise terms see the accompanying LICENSE file.
alpar@1073:  *
alpar@1073:  * This software is provided "AS IS" with no warranty of any kind,
alpar@1073:  * express or implied, and with no claim as to its suitability for any
alpar@1073:  * purpose.
alpar@1073:  *
alpar@1073:  */
alpar@1073: 
alpar@1073: #ifndef LEMON_GRAPH_TO_EPS_H
alpar@1073: #define LEMON_GRAPH_TO_EPS_H
alpar@1073: 
alpar@1073: #include<iostream>
alpar@1073: #include<fstream>
alpar@1073: #include<sstream>
alpar@1073: #include<algorithm>
alpar@1073: #include<vector>
alpar@1073: 
alpar@1073: #include<lemon/xy.h>
alpar@1073: #include<lemon/maps.h>
alpar@1073: #include<lemon/bezier.h>
alpar@1073: 
alpar@1073: ///\ingroup misc
alpar@1073: ///\file
alpar@1073: ///\brief Simple graph drawer
alpar@1073: ///
alpar@1073: ///\author Alpar Juttner
alpar@1073: 
alpar@1073: namespace lemon {
alpar@1073: 
alpar@1073: ///Data structure representing RGB colors.
alpar@1073: 
alpar@1073: ///Data structure representing RGB colors.
alpar@1073: ///\ingroup misc
alpar@1073: class Color
alpar@1073: {
alpar@1073:   double _r,_g,_b;
alpar@1073: public:
alpar@1073:   ///Default constructor
alpar@1073:   Color() {}
alpar@1073:   ///Constructor
alpar@1073:   Color(double r,double g,double b) :_r(r),_g(g),_b(b) {};
alpar@1073:   ///Returns the red component
alpar@1073:   double getR() {return _r;}
alpar@1073:   ///Returns the green component
alpar@1073:   double getG() {return _g;}
alpar@1073:   ///Returns the blue component
alpar@1073:   double getB() {return _b;}
alpar@1073:   ///Set the color components
alpar@1073:   void set(double r,double g,double b) { _r=r;_g=g;_b=b; };
alpar@1073: };
alpar@1073:   
alpar@1073: ///Default traits class of \ref GraphToEps
alpar@1073: 
alpar@1073: ///Default traits class of \ref GraphToEps
alpar@1073: ///
alpar@1073: ///\c G is the type of the underlying graph.
alpar@1073: template<class G>
alpar@1073: struct DefaultGraphToEpsTraits
alpar@1073: {
alpar@1073:   typedef G Graph;
alpar@1073:   typedef typename Graph::Node Node;
alpar@1073:   typedef typename Graph::NodeIt NodeIt;
alpar@1073:   typedef typename Graph::Edge Edge;
alpar@1073:   typedef typename Graph::EdgeIt EdgeIt;
alpar@1073:   typedef typename Graph::InEdgeIt InEdgeIt;
alpar@1073:   typedef typename Graph::OutEdgeIt OutEdgeIt;
alpar@1073:   
alpar@1073: 
alpar@1073:   const Graph &g;
alpar@1073: 
alpar@1073:   std::ostream& os;
alpar@1073:   
alpar@1073:   ConstMap<typename Graph::Node,xy<double> > _coords;
alpar@1073:   ConstMap<typename Graph::Node,double > _nodeSizes;
alpar@1073: 
alpar@1073:   ConstMap<typename Graph::Node,Color > _nodeColors;
alpar@1073:   ConstMap<typename Graph::Edge,Color > _edgeColors;
alpar@1073: 
alpar@1073:   ConstMap<typename Graph::Edge,double > _edgeWidths;
alpar@1073:   
alpar@1073:   double _edgeWidthScale;
alpar@1073:   
alpar@1073:   double _nodeScale;
alpar@1073:   double _xBorder, _yBorder;
alpar@1073:   double _scale;
alpar@1073:   double _nodeBorderQuotient;
alpar@1073:   
alpar@1073:   bool _drawArrows;
alpar@1073:   double _arrowLength, _arrowWidth;
alpar@1073:   
alpar@1073:   bool _showNodes, _showEdges;
alpar@1073: 
alpar@1073:   bool _enableParallel;
alpar@1073:   double _parEdgeDist;
alpar@1073: 
alpar@1073:   bool _showNodeText;
alpar@1073:   ConstMap<typename Graph::Node,bool > _nodeTexts;  
alpar@1073:   double _nodeTextSize;
alpar@1073: 
alpar@1073:   bool _undir;
alpar@1073:   bool _pleaseRemoveOsStream;
alpar@1073:   ///Constructor
alpar@1073: 
alpar@1073:   ///Constructor
alpar@1073:   ///\param _g is a reference to the graph to be printed
alpar@1073:   ///\param _os is a reference to the output stream.
alpar@1073:   ///\param _os is a reference to the output stream.
alpar@1073:   ///\param _pros If it is \c true, then the \c ostream referenced by \c _os
alpar@1073:   ///will be explicitly deallocated by the destructor.
alpar@1073:   ///By default it is <tt>std::cout</tt>
alpar@1073:   DefaultGraphToEpsTraits(const G &_g,std::ostream& _os=std::cout,
alpar@1073: 			  bool _pros=false) :
alpar@1073:     g(_g), os(_os),
alpar@1073:     _coords(xy<double>(1,1)), _nodeSizes(1.0),
alpar@1073:     _nodeColors(Color(1,1,1)), _edgeColors(Color(0,0,0)),
alpar@1073:     _edgeWidths(1), _edgeWidthScale(0.3),
alpar@1073:     _nodeScale(1.0), _xBorder(10), _yBorder(10), _scale(1.0),
alpar@1073:     _nodeBorderQuotient(.1),
alpar@1073:     _drawArrows(false), _arrowLength(1), _arrowWidth(0.3),
alpar@1073:     _showNodes(true), _showEdges(true),
alpar@1073:     _enableParallel(false), _parEdgeDist(1),
alpar@1073:     _showNodeText(false), _nodeTexts(false), _nodeTextSize(1),
alpar@1073:     _undir(false),
alpar@1073:     _pleaseRemoveOsStream(_pros) {}
alpar@1073: };
alpar@1073: 
alpar@1073: ///Helper class to implement the named parameters of \ref graphToEps()
alpar@1073: 
alpar@1073: ///Helper class to implement the named parameters of \ref graphToEps()
alpar@1073: ///\todo Is 'helper class' a good name for this?
alpar@1073: ///
alpar@1073: template<class T> class GraphToEps : public T 
alpar@1073: {
alpar@1073:   typedef typename T::Graph Graph;
alpar@1073:   typedef typename Graph::Node Node;
alpar@1073:   typedef typename Graph::NodeIt NodeIt;
alpar@1073:   typedef typename Graph::Edge Edge;
alpar@1073:   typedef typename Graph::EdgeIt EdgeIt;
alpar@1073:   typedef typename Graph::InEdgeIt InEdgeIt;
alpar@1073:   typedef typename Graph::OutEdgeIt OutEdgeIt;
alpar@1073: 
alpar@1073:   bool dontPrint;
alpar@1073: 
alpar@1073:   class edgeLess {
alpar@1073:     const Graph &g;
alpar@1073:   public:
alpar@1073:     edgeLess(const Graph &_g) : g(_g) {}
alpar@1073:     bool operator()(Edge a,Edge b) const 
alpar@1073:     {
alpar@1073:       Node ai=min(g.source(a),g.target(a));
alpar@1073:       Node aa=max(g.source(a),g.target(a));
alpar@1073:       Node bi=min(g.source(b),g.target(b));
alpar@1073:       Node ba=max(g.source(b),g.target(b));
alpar@1073:       return ai<bi ||
alpar@1073: 	(ai==bi && (aa < ba || 
alpar@1073: 		    (aa==ba && ai==g.source(a) && bi==g.target(b))));
alpar@1073:     }
alpar@1073:   };
alpar@1073:   bool isParallel(Edge e,Edge f) const
alpar@1073:   {
alpar@1073:     return (g.source(e)==g.source(f)&&g.target(e)==g.target(f))||
alpar@1073:       (g.source(e)==g.target(f)&&g.target(e)==g.source(f));
alpar@1073:   }
alpar@1073:   static xy<double> rot(xy<double> v) 
alpar@1073:   {
alpar@1073:     return xy<double>(v.y,-v.x);
alpar@1073:   }
alpar@1073:   template<class xy>
alpar@1073:   static std::string psOut(const xy &p) 
alpar@1073:     {
alpar@1073:       std::ostringstream os;	
alpar@1073:       os << p.x << ' ' << p.y;
alpar@1073:       return os.str();
alpar@1073:     }
alpar@1073:   
alpar@1073: public:
alpar@1073:   GraphToEps(const T &t) : T(t), dontPrint(false) {};
alpar@1073:   
alpar@1073:   template<class X> struct CoordsTraits : public T {
alpar@1073:     const X &_coords;
alpar@1073:     CoordsTraits(const T &t,const X &x) : T(t), _coords(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the map of the node coordinates
alpar@1073: 
alpar@1073:   ///Sets the map of the node coordinates.
alpar@1073:   ///\param x must be a node map with xy<double> or xy<int> values. 
alpar@1073:   template<class X> GraphToEps<CoordsTraits<X> > coords(const X &x) {
alpar@1073:     dontPrint=true;
alpar@1073:     return GraphToEps<CoordsTraits<X> >(CoordsTraits<X>(*this,x));
alpar@1073:   }
alpar@1073:   template<class X> struct NodeSizesTraits : public T {
alpar@1073:     const X &_nodeSizes;
alpar@1073:     NodeSizesTraits(const T &t,const X &x) : T(t), _nodeSizes(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the map of the node sizes
alpar@1073: 
alpar@1073:   ///Sets the map of the node sizes
alpar@1073:   ///\param x must be a node map with \c double (or convertible) values. 
alpar@1073:   template<class X> GraphToEps<NodeSizesTraits<X> > nodeSizes(const X &x)
alpar@1073:   {
alpar@1073:     dontPrint=true;
alpar@1073:     return GraphToEps<NodeSizesTraits<X> >(NodeSizesTraits<X>(*this,x));
alpar@1073:   }
alpar@1073:   template<class X> struct NodeTextsTraits : public T {
alpar@1073:     const X &_nodeTexts;
alpar@1073:     NodeTextsTraits(const T &t,const X &x) : T(t), _nodeTexts(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the text printed on the nodes
alpar@1073: 
alpar@1073:   ///Sets the text printed on the nodes
alpar@1073:   ///\param x must be a node map with type that can be pushed to a standard
alpar@1073:   ///ostream. 
alpar@1073:   template<class X> GraphToEps<NodeTextsTraits<X> > nodeTexts(const X &x)
alpar@1073:   {
alpar@1073:     dontPrint=true;
alpar@1073:     _showNodeText=true;
alpar@1073:     return GraphToEps<NodeTextsTraits<X> >(NodeTextsTraits<X>(*this,x));
alpar@1073:   }
alpar@1073:    template<class X> struct EdgeWidthsTraits : public T {
alpar@1073:     const X &_edgeWidths;
alpar@1073:     EdgeWidthsTraits(const T &t,const X &x) : T(t), _edgeWidths(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the map of the edge widths
alpar@1073: 
alpar@1073:   ///Sets the map of the edge widths
alpar@1073:   ///\param x must be a edge map with \c double (or convertible) values. 
alpar@1073:   template<class X> GraphToEps<EdgeWidthsTraits<X> > edgeWidths(const X &x)
alpar@1073:   {
alpar@1073:     dontPrint=true;
alpar@1073:     return GraphToEps<EdgeWidthsTraits<X> >(EdgeWidthsTraits<X>(*this,x));
alpar@1073:   }
alpar@1073: 
alpar@1073:   template<class X> struct NodeColorsTraits : public T {
alpar@1073:     const X &_nodeColors;
alpar@1073:     NodeColorsTraits(const T &t,const X &x) : T(t), _nodeColors(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the map of the node colors
alpar@1073: 
alpar@1073:   ///Sets the map of the node colors
alpar@1073:   ///\param x must be a node map with \ref Color values. 
alpar@1073:   template<class X> GraphToEps<NodeColorsTraits<X> >
alpar@1073:   nodeColors(const X &x)
alpar@1073:   {
alpar@1073:     dontPrint=true;
alpar@1073:     return GraphToEps<NodeColorsTraits<X> >(NodeColorsTraits<X>(*this,x));
alpar@1073:   }
alpar@1073:   template<class X> struct EdgeColorsTraits : public T {
alpar@1073:     const X &_edgeColors;
alpar@1073:     EdgeColorsTraits(const T &t,const X &x) : T(t), _edgeColors(x) {}
alpar@1073:   };
alpar@1073:   ///Sets the map of the edge colors
alpar@1073: 
alpar@1073:   ///Sets the map of the edge colors
alpar@1073:   ///\param x must be a edge map with \ref Color values. 
alpar@1073:   template<class X> GraphToEps<EdgeColorsTraits<X> >
alpar@1073:   edgeColors(const X &x)
alpar@1073:   {
alpar@1073:     dontPrint=true;
alpar@1073:     return GraphToEps<EdgeColorsTraits<X> >(EdgeColorsTraits<X>(*this,x));
alpar@1073:   }
alpar@1073:   ///Sets a global scale factor for node sizes
alpar@1073: 
alpar@1073:   ///Sets a global scale factor for node sizes
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &nodeScale(double d) {_nodeScale=d;return *this;}
alpar@1073:   ///Sets a global scale factor for edge widths
alpar@1073: 
alpar@1073:   ///Sets a global scale factor for edge widths
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &edgeWidthScale(double d) {_edgeWidthScale=d;return *this;}
alpar@1073:   ///Sets a global scale factor for the whole picture
alpar@1073: 
alpar@1073:   ///Sets a global scale factor for the whole picture
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &scale(double d) {_scale=d;return *this;}
alpar@1073:   ///Sets the width of the border around the picture
alpar@1073: 
alpar@1073:   ///Sets the width of the border around the picture
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &border(double b) {_xBorder=_yBorder=b;return *this;}
alpar@1073:   ///Sets the width of the border around the picture
alpar@1073: 
alpar@1073:   ///Sets the width of the border around the picture
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &border(double x, double y) {
alpar@1073:     _xBorder=x;_yBorder=y;return *this;
alpar@1073:   }
alpar@1073:   ///Sets whether to draw arrows
alpar@1073: 
alpar@1073:   ///Sets whether to draw arrows
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &drawArrows(bool b=true) {_drawArrows=b;return *this;}
alpar@1073:   ///Sets the length of the arrowheads
alpar@1073: 
alpar@1073:   ///Sets the length of the arrowheads
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &arrowLength(double d) {_arrowLength*=d;return *this;}
alpar@1073:   ///Sets the width of the arrowheads
alpar@1073: 
alpar@1073:   ///Sets the width of the arrowheads
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &arrowWidth(double d) {_arrowWidth*=d;return *this;}
alpar@1073:   
alpar@1073:   ///Enables parallel edges
alpar@1073: 
alpar@1073:   ///Enables parallel edges
alpar@1073:   ///\todo Partially implemented
alpar@1073:   GraphToEps<T> &enableParallel(bool b=true) {_enableParallel=b;return *this;}
alpar@1073:   
alpar@1073:   ///Sets the distance 
alpar@1073:   
alpar@1073:   ///Sets the distance 
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &parEdgeDist(double d) {_parEdgeDist*=d;return *this;}
alpar@1073:   
alpar@1073:   ///Hides the edges
alpar@1073:   
alpar@1073:   ///Hides the edges
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &hideEdges(bool b=true) {_showEdges=!b;return *this;}
alpar@1073:   ///Hides the nodes
alpar@1073:   
alpar@1073:   ///Hides the nodes
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &hideNodes(bool b=true) {_showNodes=!b;return *this;}
alpar@1073:   
alpar@1073:   ///Sets the size of the node texts
alpar@1073:   
alpar@1073:   ///Sets the size of the node texts
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &nodeTextSize(double d) {_nodeTextSize=d;return *this;}
alpar@1073:   ///Sets whether the the graph is undirected
alpar@1073: 
alpar@1073:   ///Sets whether the the graph is undirected
alpar@1073:   ///
alpar@1073:   GraphToEps<T> &undir(bool b=true) {_undir=b;return *this;}
alpar@1073:   ///Sets whether the the graph is directed
alpar@1073: 
alpar@1073:   ///Sets whether the the graph is directed.
alpar@1073:   ///Use it to show the undirected edges as a pair of directed ones.
alpar@1073:   GraphToEps<T> &bidir(bool b=true) {_undir=!b;return *this;}
alpar@1073:   
alpar@1073:   ~GraphToEps() 
alpar@1073:   {
alpar@1073:     if(dontPrint) return;
alpar@1073:     
alpar@1073:     os << "%!PS-Adobe-2.0 EPSF-2.0\n";
alpar@1073:     //\todo: Chech whether the graph is empty.
alpar@1073:     BoundingBox<double> bb;
alpar@1073:     for(NodeIt n(g);n!=INVALID;++n) {
alpar@1073:       double ns=_nodeSizes[n]*_nodeScale;
alpar@1073:       xy<double> p(ns,ns);
alpar@1073:       bb+=p+_coords[n];
alpar@1073:       bb+=-p+_coords[n];
alpar@1073:       }
alpar@1073:     os << "%%BoundingBox: "
alpar@1073: 	 << bb.left()*  _scale-_xBorder << ' '
alpar@1073: 	 << bb.bottom()*_scale-_yBorder << ' '
alpar@1073: 	 << bb.right()* _scale+_xBorder << ' '
alpar@1073: 	 << bb.top()*   _scale+_yBorder << '\n';
alpar@1073:     //x1 y1 x2 y2 x3 y3 cr cg cb w
alpar@1073:     os << "/lb { setlinewidth setrgbcolor newpath moveto\n"
alpar@1073:        << "      4 2 roll 1 index 1 index curveto stroke } bind def\n";
alpar@1073:     os << "/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def\n";
alpar@1073:     os << "/c { newpath dup 3 index add 2 index moveto 0 360 arc closepath } bind def\n";
alpar@1073:     // x y r cr cg cb
alpar@1073:     os << "/n { setrgbcolor 2 index 2 index 2 index c fill\n"
alpar@1073:        << "     0 0 0 setrgbcolor dup "
alpar@1073:        << _nodeBorderQuotient << " mul setlinewidth "
alpar@1073:        << 1+_nodeBorderQuotient/2 << " div c stroke\n"
alpar@1073:        << "   } bind def\n";
alpar@1073:     os << "/arrl " << _arrowLength << " def\n";
alpar@1073:     os << "/arrw " << _arrowWidth << " def\n";
alpar@1073:     // l dx_norm dy_norm
alpar@1073:     os << "/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def\n";
alpar@1073:     //len w dx_norm dy_norm x1 y1 cr cg cb
alpar@1073:     os << "/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def\n"
alpar@1073:        << "       /w exch def /len exch def\n"
alpar@1073:       //	 << "       0.1 setlinewidth x1 y1 moveto dx len mul dy len mul rlineto stroke"
alpar@1073:        << "       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto\n"
alpar@1073:        << "       len w sub arrl sub dx dy lrl\n"
alpar@1073:        << "       arrw dy dx neg lrl\n"
alpar@1073:        << "       dx arrl w add mul dy w 2 div arrw add mul sub\n"
alpar@1073:        << "       dy arrl w add mul dx w 2 div arrw add mul add rlineto\n"
alpar@1073:        << "       dx arrl w add mul neg dy w 2 div arrw add mul sub\n"
alpar@1073:        << "       dy arrl w add mul neg dx w 2 div arrw add mul add rlineto\n"
alpar@1073:        << "       arrw dy dx neg lrl\n"
alpar@1073:        << "       len w sub arrl sub neg dx dy lrl\n"
alpar@1073:        << "       closepath fill } bind def\n";
alpar@1073:     os << "/cshow { 2 index 2 index moveto dup stringwidth pop\n"
alpar@1073:        << "         neg 2 div fosi .35 mul neg rmoveto show pop pop} def\n";
alpar@1073: 
alpar@1073:     os << "\ngsave\n";
alpar@1073:     if(_scale!=1.0) os << _scale << " dup scale\n";
alpar@1073:     
alpar@1073:     os << "%Edges:\ngsave\n";
alpar@1073:     
alpar@1073:     if(_showEdges)
alpar@1073:       if(_enableParallel) {
alpar@1073: 	std::vector<Edge> el;
alpar@1073: 	for(EdgeIt e(g);e!=INVALID;++e)
alpar@1073: 	  if(!_undir||g.source(e)<g.target(e)) el.push_back(e);
alpar@1073: 	sort(el.begin(),el.end(),edgeLess(g));
alpar@1073: 	
alpar@1073: 	typename std::vector<Edge>::iterator j;
alpar@1073: 	for(typename std::vector<Edge>::iterator i=el.begin();i!=el.end();i=j) {
alpar@1073: 	  for(j=i+1;j!=el.end()&&isParallel(*i,*j);++j) ;
alpar@1073: 
alpar@1073: 	  double sw=0;
alpar@1073: 	  for(typename std::vector<Edge>::iterator e=i;e!=j;++e)
alpar@1073: 	    sw+=_edgeWidths[*e]*_edgeWidthScale+_parEdgeDist;
alpar@1073: 	  sw-=_parEdgeDist;
alpar@1073: 	  sw/=-2.0;
alpar@1073: 	  xy<double> d(_coords[g.target(*i)]-_coords[g.source(*i)]);
alpar@1073: 	  double l=sqrt(d.normSquare());
alpar@1073: 	  d/=l;
alpar@1073: 	  
alpar@1073: 	  for(typename std::vector<Edge>::iterator e=i;e!=j;++e) {
alpar@1073: 	    sw+=_edgeWidths[*e]*_edgeWidthScale/2.0;
alpar@1073: 	    xy<double> m(_coords[g.target(*e)]+_coords[g.source(*e)]);
alpar@1073: 	    m=m/2.0+rot(d)*sw/.75;
alpar@1073: 	    if(_drawArrows) {
alpar@1073: 	      const int INERPOL_PREC=20;
alpar@1073: 	      xy<double> s=_coords[g.source(*e)];
alpar@1073: 	      xy<double> t=_coords[g.target(*e)];
alpar@1073: 	      double rn=_nodeSizes[g.target(*e)]*_nodeScale;
alpar@1073: 	      rn*=rn;
alpar@1073: 	      Bezier3 bez(s,m,m,t);
alpar@1073: 	      double t1=0,t2=1;
alpar@1073: 	      for(int i=0;i<INERPOL_PREC;++i)
alpar@1073: 		if((bez((t1+t2)/2)-t).normSquare()>rn) t1=(t1+t2)/2;
alpar@1073: 		else t2=(t1+t2)/2;
alpar@1073: 	      xy<double> apoint=bez((t1+t2)/2);
alpar@1073: 	      rn = _nodeSizes[g.target(*e)]*_nodeScale+_arrowLength+
alpar@1073: 		_edgeWidths[*e]*_edgeWidthScale;
alpar@1073: 	      rn*=rn;
alpar@1073: 	      t1=0;t2=1;
alpar@1073: 	      for(int i=0;i<INERPOL_PREC;++i)
alpar@1073: 		if((bez((t1+t2)/2)-t).normSquare()>rn) t1=(t1+t2)/2;
alpar@1073: 		else t2=(t1+t2)/2;
alpar@1073: 	      xy<double> linend=bez((t1+t2)/2);	      
alpar@1073: 	      bez=bez.before((t1+t2)/2);
alpar@1073: 	      rn=_nodeSizes[g.source(*e)]*_nodeScale; rn*=rn;
alpar@1073: 	      t1=0;t2=1;
alpar@1073: 	      for(int i=0;i<INERPOL_PREC;++i)
alpar@1073: 		if((bez((t1+t2)/2)-s).normSquare()>rn) t2=(t1+t2)/2;
alpar@1073: 		else t1=(t1+t2)/2;
alpar@1073: 	      bez=bez.after((t1+t2)/2);
alpar@1073: 	      os << _edgeWidths[*e]*_edgeWidthScale << " setlinewidth "
alpar@1073: 		 << _edgeColors[*e].getR() << ' '
alpar@1073: 		 << _edgeColors[*e].getG() << ' '
alpar@1073: 		 << _edgeColors[*e].getB() << " setrgbcolor newpath\n"
alpar@1073: 		 << bez.p1.x << ' ' <<  bez.p1.y << " moveto\n"
alpar@1073: 		 << bez.p2.x << ' ' << bez.p2.y << ' '
alpar@1073: 		 << bez.p3.x << ' ' << bez.p3.y << ' '
alpar@1073: 		 << bez.p4.x << ' ' << bez.p4.y << " curveto stroke\n";
alpar@1073: 	      xy<double> dd(rot(linend-apoint));
alpar@1073: 	      dd*=(_edgeWidths[*e]*_edgeWidthScale+_arrowWidth)/
alpar@1073: 		sqrt(dd.normSquare());
alpar@1073: 	      os << "newpath " << psOut(apoint) << " moveto "
alpar@1073: 		 << psOut(linend+dd) << " lineto "
alpar@1073: 		 << psOut(linend-dd) << " lineto closepath fill\n";
alpar@1073: 	    }
alpar@1073: 	    else {
alpar@1073: 	      os << _coords[g.source(*e)].x << ' '
alpar@1073: 		 << _coords[g.source(*e)].y << ' '
alpar@1073: 		 << m.x << ' ' << m.y << ' '
alpar@1073: 		 << _coords[g.target(*e)].x << ' '
alpar@1073: 		 << _coords[g.target(*e)].y << ' '
alpar@1073: 		 << _edgeColors[*e].getR() << ' '
alpar@1073: 		 << _edgeColors[*e].getG() << ' '
alpar@1073: 		 << _edgeColors[*e].getB() << ' '
alpar@1073: 		 << _edgeWidths[*e]*_edgeWidthScale << " lb\n";
alpar@1073: 	    }
alpar@1073: 	    sw+=_edgeWidths[*e]*_edgeWidthScale/2.0+_parEdgeDist;
alpar@1073: 	  }
alpar@1073: 	}
alpar@1073:       }
alpar@1073:       else for(EdgeIt e(g);e!=INVALID;++e)
alpar@1073: 	if(!_undir||g.source(e)<g.target(e))
alpar@1073: 	  if(_drawArrows) {
alpar@1073: 	    xy<double> d(_coords[g.target(e)]-_coords[g.source(e)]);
alpar@1073: 	    double l=sqrt(d.normSquare());
alpar@1073: 	    d/=l;
alpar@1073: 	    xy<double> x1(d*_nodeScale*_nodeSizes[g.source(e)]+
alpar@1073: 			  _coords[g.source(e)]);
alpar@1073: 	    os << l-(_nodeSizes[g.source(e)]+
alpar@1073: 		     _nodeSizes[g.target(e)])*_nodeScale << ' '
alpar@1073: 	       << _edgeWidths[e]*_edgeWidthScale << ' '
alpar@1073: 	       << d.x << ' ' << d.y << ' '
alpar@1073: 	       << x1.x << ' ' << x1.y << ' '
alpar@1073: 	       << _edgeColors[e].getR() << ' '
alpar@1073: 	       << _edgeColors[e].getG() << ' '
alpar@1073: 	       << _edgeColors[e].getB() << " arr\n";
alpar@1073: 	  }
alpar@1073: 	  else os << _coords[g.source(e)].x << ' '
alpar@1073: 		  << _coords[g.source(e)].y << ' '
alpar@1073: 		  << _coords[g.target(e)].x << ' '
alpar@1073: 		  << _coords[g.target(e)].y << ' '
alpar@1073: 		  << _edgeColors[e].getR() << ' '
alpar@1073: 		  << _edgeColors[e].getG() << ' '
alpar@1073: 		  << _edgeColors[e].getB() << ' '
alpar@1073: 		  << _edgeWidths[e]*_edgeWidthScale << " l\n";
alpar@1073:     os << "grestore\n%Nodes:\ngsave\n";
alpar@1073:     if(_showNodes)
alpar@1073:       for(NodeIt n(g);n!=INVALID;++n)
alpar@1073: 	os << _coords[n].x << ' ' << _coords[n].y << ' '
alpar@1073: 	   << _nodeSizes[n]*_nodeScale << ' '
alpar@1073: 	   << _nodeColors[n].getR() << ' '
alpar@1073: 	   << _nodeColors[n].getG() << ' '
alpar@1073: 	   << _nodeColors[n].getB() << " n\n"; 
alpar@1073:     if(_showNodeText) {
alpar@1073:       os << "grestore\n%Node texts:\ngsave\n";
alpar@1073:       os << "/fosi " << _nodeTextSize << " def\n";
alpar@1073:       os << "(Helvetica) findfont fosi scalefont setfont\n";
alpar@1073:       os << "0 0 0 setrgbcolor\n";
alpar@1073:       for(NodeIt n(g);n!=INVALID;++n)
alpar@1073: 	os << _coords[n].x << ' ' << _coords[n].y
alpar@1073: 	   << " (" << _nodeTexts[n] << ") cshow\n";
alpar@1073:     }
alpar@1073:     os << "grestore\ngrestore\n";
alpar@1073: 
alpar@1073:     //CleanUp:
alpar@1073:     if(_pleaseRemoveOsStream) {delete &os;}
alpar@1073:   } 
alpar@1073: };
alpar@1073: 
alpar@1073: 
alpar@1073: ///Generates an EPS file from a graph
alpar@1073: 
alpar@1073: ///\ingroup misc
alpar@1073: ///Generates an EPS file from a graph.
alpar@1073: ///\param g is a reference to the graph to be printed
alpar@1073: ///\param os is a reference to the output stream.
alpar@1073: ///By default it is <tt>std::cout</tt>
alpar@1073: ///
alpar@1073: ///This function also has a lot of \ref named-templ-param "named parameters",
alpar@1073: ///they are declared as the members of class \ref GraphToEps. The following
alpar@1073: ///example shows how to use these parameters.
alpar@1073: ///\code
alpar@1073: /// graphToEps(g).scale(10).coords(coords)
alpar@1073: ///              .nodeScale(2).nodeSizes(sizes)
alpar@1073: ///              .edgeWidthScale(.4);
alpar@1073: ///\endcode
alpar@1073: ///\sa GraphToEps
alpar@1073: ///\sa graphToEps(G &g, char *file_name)
alpar@1073: template<class G>
alpar@1073: GraphToEps<DefaultGraphToEpsTraits<G> > 
alpar@1073: graphToEps(G &g, std::ostream& os=std::cout)
alpar@1073: {
alpar@1073:   return 
alpar@1073:     GraphToEps<DefaultGraphToEpsTraits<G> >(DefaultGraphToEpsTraits<G>(g,os));
alpar@1073: }
alpar@1073:  
alpar@1073: ///Generates an EPS file from a graph
alpar@1073: 
alpar@1073: //\ingroup misc
alpar@1073: ///This function does the same as
alpar@1073: ///\ref graphToEps(G &g,std::ostream& os)
alpar@1073: ///but it writes its output into the file \c file_name
alpar@1073: ///instead of a stream.
alpar@1073: ///\sa graphToEps(G &g, std::ostream& os)
alpar@1073: template<class G>
alpar@1073: GraphToEps<DefaultGraphToEpsTraits<G> > 
alpar@1073: graphToEps(G &g,char *file_name)
alpar@1073: {
alpar@1073:   return GraphToEps<DefaultGraphToEpsTraits<G> >
alpar@1073:     (DefaultGraphToEpsTraits<G>(g,*new std::ofstream(file_name),true));
alpar@1073: }
alpar@1073: 
alpar@1073: //Generates an EPS file from a graph.
alpar@1073: //\param g is a reference to the graph to be printed
alpar@1073: //\param file_name is the output file_name.
alpar@1073: //
alpar@1073: //This function also has a lot of \ref named-templ-param "named parameters",
alpar@1073: //they are declared as the members of class \ref GraphToEps. The following
alpar@1073: //example shows how to use these parameters.
alpar@1073: //\code
alpar@1073: // graphToEps(g).scale(10).coords(coords)
alpar@1073: //              .nodeScale(2).nodeSizes(sizes)
alpar@1073: //              .edgeWidthScale(.4);
alpar@1073: //\endcode
alpar@1073: //\sa GraphToEps
alpar@1073: //\todo Avoid duplicated documentation
alpar@1073: //\bug Exception handling is missing? (Or we can just ignore it?)
alpar@1073: 
alpar@1073: } //END OF NAMESPACE LEMON
alpar@1073: 
alpar@1073: #endif // LEMON_GRAPH_TO_EPS_H