# HG changeset patch
# User alpar
# Date 1104920077 0
# Node ID 4ebe32765b48f1a5b8e619f9a5f9ebcc3a0a9842
# Parent  bcc0766a7b8674c2a6624bf0b315ed0de7cc1e61
graphToEps is now able to write to any ostream.

diff -r bcc0766a7b86 -r 4ebe32765b48 src/work/alpar/graph_to_eps.cc
--- a/src/work/alpar/graph_to_eps.cc	Tue Jan 04 22:16:46 2005 +0000
+++ b/src/work/alpar/graph_to_eps.cc	Wed Jan 05 10:14:37 2005 +0000
@@ -1,4 +1,6 @@
+#include <iostream>
 #include<math.h>
+
 #include<lemon/xy.h>
 #include<lemon/maps.h>
 #include<lemon/list_graph.h>
@@ -49,6 +51,9 @@
   
 
   const Graph &g;
+
+  std::ostream& os;
+  
   ConstMap<typename Graph::Node,xy<double> > _coords;
   ConstMap<typename Graph::Node,double > _nodeSizes;
 
@@ -70,9 +75,12 @@
   ///Constructor
 
   ///Constructor
-  ///\param _g is a reference to the underlying graph
-  DefaultGraphToEpsTraits(const G &_g) :
-    g(_g), _coords(xy<double>(1,1)), _nodeSizes(1.0),
+  ///\param _g is a reference to the graph to be printed
+  ///\param _os is a reference to the output stream.
+  ///By default it is <tt>std::cout</tt>
+  DefaultGraphToEpsTraits(const G &_g,std::ostream& _os=std::cout) :
+    g(_g), os(_os),
+    _coords(xy<double>(1,1)), _nodeSizes(1.0),
     _nodeColors(Color(1,1,1)), _edgeColors(Color(0,0,0)),
     _edgeWidths(1), _edgeWidthScale(0.3),
     _nodeScale(1.0), _xBorder(10), _yBorder(10), _scale(1.0),
@@ -214,7 +222,7 @@
   {
     if(dontPrint) return;
     
-    cout << "%!PS-Adobe-2.0 EPSF-2.0\n";
+    os << "%!PS-Adobe-2.0 EPSF-2.0\n";
     //\todo: Chech whether the graph is empty.
     BoundingBox<double> bb;
     for(NodeIt n(g);n!=INVALID;++n) {
@@ -223,26 +231,26 @@
       bb+=p+_coords[n];
       bb+=-p+_coords[n];
       }
-    cout << "%%BoundingBox: "
+    os << "%%BoundingBox: "
 	 << bb.left()*  _scale-_xBorder << ' '
 	 << bb.bottom()*_scale-_yBorder << ' '
 	 << bb.right()* _scale+_xBorder << ' '
 	 << bb.top()*   _scale+_yBorder << '\n';
     //x1 y1 x2 y2 cr cg cb w
-    cout << "/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def\n";
-    cout << "/c { newpath dup 3 index add 2 index moveto 0 360 arc } bind def\n";
+    os << "/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def\n";
+    os << "/c { newpath dup 3 index add 2 index moveto 0 360 arc } bind def\n";
     // x y r cr cg cb
-    cout << "/n { setrgbcolor 2 index 2 index 2 index c fill\n"
+    os << "/n { setrgbcolor 2 index 2 index 2 index c fill\n"
 	 << "     0 0 0 setrgbcolor dup "
 	 << _nodeBorderQuotient << " mul setlinewidth "
 	 << 1+_nodeBorderQuotient/2 << " div c stroke\n"
 	 << "   } bind def\n";
-    cout << "/arrl " << _arrowLength << " def\n";
-    cout << "/arrw " << _arrowWidth << " def\n";
+    os << "/arrl " << _arrowLength << " def\n";
+    os << "/arrw " << _arrowWidth << " def\n";
     // l dx_norm dy_norm
-    cout << "/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def\n";
+    os << "/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def\n";
     //len w dx_norm dy_norm x1 y1 cr cg cb
-    cout << "/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def\n"
+    os << "/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def\n"
 	 << "       /w exch def /len exch def\n"
       //	 << "       0.1 setlinewidth x1 y1 moveto dx len mul dy len mul rlineto stroke"
 	 << "       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto\n"
@@ -255,9 +263,9 @@
 	 << "       arrw dy dx neg lrl\n"
 	 << "       len w sub arrl sub neg dx dy lrl\n"
 	 << "       closepath fill } bind def\n";
-    cout << "\ngsave\n";
-    if(_scale!=1.0) cout << _scale << " dup scale\n";
-    cout << "%Edges:\ngsave\n";
+    os << "\ngsave\n";
+    if(_scale!=1.0) os << _scale << " dup scale\n";
+    os << "%Edges:\ngsave\n";
     for(NodeIt n(g);n!=INVALID;++n)
       for(OutEdgeIt e(g,n);e!=INVALID;++e)
 	if(_drawArrows) {
@@ -266,7 +274,7 @@
 	  d/=l;
 	  xy<double> x1(d*_nodeScale*_nodeSizes[g.source(e)]+
 			_coords[g.source(e)]);
-	  cout << l-(_nodeSizes[g.source(e)]+
+	  os << l-(_nodeSizes[g.source(e)]+
 		     _nodeSizes[g.target(e)])*_nodeScale << ' '
 	       << _edgeWidths[e]*_edgeWidthScale << ' '
 	       << d.x << ' ' << d.y << ' '
@@ -275,7 +283,7 @@
 	       << _edgeColors[e].getG() << ' '
 	       << _edgeColors[e].getB() << " arr\n";
 	}
-    	else cout << _coords[g.source(e)].x << ' '
+    	else os << _coords[g.source(e)].x << ' '
 		  << _coords[g.source(e)].y << ' '
 		  << _coords[g.target(e)].x << ' '
 		  << _coords[g.target(e)].y << ' '
@@ -283,14 +291,14 @@
 		  << _edgeColors[e].getG() << ' '
 		  << _edgeColors[e].getB() << ' '
 		  << _edgeWidths[e]*_edgeWidthScale << " l\n";
-    cout << "grestore\n%Nodes:\ngsave\n";
+    os << "grestore\n%Nodes:\ngsave\n";
     for(NodeIt n(g);n!=INVALID;++n)
-      cout << _coords[n].x << ' ' << _coords[n].y << ' '
+      os << _coords[n].x << ' ' << _coords[n].y << ' '
 	   << _nodeSizes[n]*_nodeScale << ' '
 	   << _nodeColors[n].getR() << ' '
 	   << _nodeColors[n].getG() << ' '
 	   << _nodeColors[n].getB() << " n\n"; 
-    cout << "grestore\ngrestore\n";
+    os << "grestore\ngrestore\n";
   } 
 };
 
@@ -299,8 +307,11 @@
 
 ///\ingroup misc
 ///Generates an EPS file from a graph.
+///\param g is a reference to the graph to be printed
+///\param os is a reference to the output stream.
+///By default it is <tt>std::cout</tt>
 ///
-///This function has a lot of \ref named-templ-param "named parameters",
+///This function also has a lot of \ref named-templ-param "named parameters",
 ///they are declared as the members of class \ref GraphToEps. The following
 ///example shows how to use these parameters.
 ///\code
@@ -310,7 +321,7 @@
 ///\endcode
 ///\sa GraphToEps
 template<class G>
-GraphToEps<DefaultGraphToEpsTraits<G> > graphToEps(G &g)
+GraphToEps<DefaultGraphToEpsTraits<G> > graphToEps(G &g,std::ostream& os=std::cout)
 {
   return GraphToEps<DefaultGraphToEpsTraits<G> >(DefaultGraphToEpsTraits<G>(g));
 }