From 19a528cb8e524239aaeea16df87558ca4be4cced Mon Sep 17 00:00:00 2001
From: Tim Dwyer <tgdwyer@gmail.com>
Date: Mon, 13 Feb 2006 02:00:14 +0000
Subject: Added connector graph layout functionality

(bzr r122)
---
 src/graphlayout/graphlayout.cpp | 147 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 src/graphlayout/graphlayout.cpp

(limited to 'src/graphlayout/graphlayout.cpp')

diff --git a/src/graphlayout/graphlayout.cpp b/src/graphlayout/graphlayout.cpp
new file mode 100644
index 000000000..9828e22fe
--- /dev/null
+++ b/src/graphlayout/graphlayout.cpp
@@ -0,0 +1,147 @@
+/** \file
+ * Interface between Inkscape code (SPItem) and graphlayout functions.
+ */
+/*
+* Authors:
+*   Tim Dwyer <tgdwyer@gmail.com>
+*
+* Copyright (C) 2005 Authors
+*
+* Released under GNU GPL.  Read the file 'COPYING' for more information.
+*/
+#include "graphlayout/graphlayout.h"
+#include <iostream>
+#include <config.h>
+
+#ifdef HAVE_BOOST_GRAPH_LIB
+#include "sp-item.h"
+#include "sp-item-transform.h"
+#include "sp-conn-end-pair.h"
+#include "conn-avoid-ref.h"
+#include "libavoid/connector.h"
+#include <boost/graph/kamada_kawai_spring_layout.hpp>
+#include <boost/graph/circle_layout.hpp>
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/simple_point.hpp>
+#include <boost/graph/graphviz.hpp>
+#include <map>
+#include <vector>
+#include <algorithm>
+#include <float.h>
+#include <string.h>
+
+using namespace boost;
+// create a typedef for the Graph type
+typedef adjacency_list<vecS, vecS, undirectedS, no_property, 
+	property<edge_weight_t, double> > Graph;
+typedef property_map<Graph, edge_weight_t>::type WeightMap;
+typedef graph_traits<Graph>::vertex_descriptor Vertex;
+typedef std::vector<simple_point<double> > PositionVec;
+typedef iterator_property_map<PositionVec::iterator, property_map<Graph, vertex_index_t>::type> PositionMap;
+#endif // HAVE_BOOST_GRAPH_LIB
+
+/**
+* Takes a list of inkscape items, extracts the graph defined by 
+* connectors between them, and uses graph layout techniques to find
+* a nice layout
+*/
+void graphlayout(GSList const *const items) {
+	if(!items) {
+		return;
+	}
+#ifdef HAVE_BOOST_GRAPH_LIB
+
+
+	using Inkscape::Util::GSListConstIterator;
+	std::list<SPItem *> selected;
+	selected.insert<GSListConstIterator<SPItem *> >(selected.end(), items, NULL);
+	if (selected.empty()) return;
+	int n=selected.size();
+
+	//Check 2 or more selected objects
+	if (n < 2) return;
+
+	Graph g;
+
+	std::cout<<"Building graph with "<<n<<" nodes"<<std::endl;
+	double minX=DBL_MAX, minY=DBL_MAX, maxX=-DBL_MAX, maxY=-DBL_MAX;
+
+	std::map<std::string,Vertex> nodelookup;
+	for (std::list<SPItem *>::iterator it(selected.begin());
+		it != selected.end();
+		++it)
+	{
+		SPItem *u=*it;
+		std::cout<<"id:"<<u->id<<std::endl;
+		if(strncmp(u->id,"path",4)) {
+			nodelookup[u->id]=add_vertex(g);
+		}
+	}
+	WeightMap weightmap=get(edge_weight, g);
+	std::cout<<"Added vertices: Graph has |V|="<<num_vertices(g)<<std::endl;
+
+	NR::Point const gap(0, 0);
+	int i=0;
+	for (std::list<SPItem *>::iterator it(selected.begin());
+		it != selected.end();
+		++it)
+	{
+		using NR::X; using NR::Y;
+		SPItem *itu=*it;
+		Vertex u=nodelookup[itu->id];
+		GSList *nlist=itu->avoidRef->getAttachedConnectors(Avoid::ConnRef::runningFrom);
+		std::list<SPItem *> neighbours;
+		neighbours.insert<GSListConstIterator<SPItem *> >(neighbours.end(),nlist,NULL);
+		std::cout<<"  Node "<<itu->id<<" has "<<neighbours.size()<<" neighbours"<<std::endl;
+		for (std::list<SPItem *>::iterator ne(neighbours.begin());
+				ne != neighbours.end();
+				++ne) {
+			
+			SPItem *itv=*ne;
+			std::cout<<"neighbour: "<<itv->id<<std::endl;
+			Vertex v=nodelookup[itv->id];
+			std::cout<<"    Neighbour: "<<v;
+			Graph::edge_descriptor e; bool inserted;
+			tie(e, inserted)=add_edge(u,v,g);
+			weightmap[e]=1.0;
+		}
+		if(nlist) {
+			g_slist_free(nlist);
+		}
+		NR::Rect const item_box(sp_item_bbox_desktop(*it));
+			
+		NR::Point ll(item_box.min());
+		minX=std::min(ll[0],minX);
+		minY=std::min(ll[1],minY);
+		NR::Point ur(item_box.max());
+		maxX=std::max(ur[0],maxX);
+		maxY=std::max(ur[1],maxY);
+	}
+	double width=maxX-minX;
+	double height=maxY-minY;
+	std::cout<<"Graph has |V|="<<num_vertices(g)<<" Width="<<width<<" Height="<<height<<std::endl;
+  	PositionVec position_vec(num_vertices(g));
+  	PositionMap position(position_vec.begin(), get(vertex_index, g));
+  	write_graphviz(std::cout, g);
+	circle_graph_layout(g, position, width/2.0);
+	kamada_kawai_spring_layout(g, position, weightmap, side_length(width));
+
+	graph_traits<Graph>::vertex_iterator vi, vi_end;
+	i=0;
+	for (std::list<SPItem *>::iterator it(selected.begin());
+		it != selected.end();
+		++it)
+	{
+		SPItem *u=*it;
+		if(strncmp(u->id,"path",4)) {
+			NR::Rect const item_box(sp_item_bbox_desktop(u));
+			NR::Point const curr(item_box.midpoint());
+			NR::Point const dest(minX+width/2.0+position[nodelookup[u->id]].x,
+				     	minY+height/2.0+position[nodelookup[u->id]].y);
+			sp_item_move_rel(u, NR::translate(dest - curr));
+		}
+	}
+#else
+	std::cout<<"Connector network layout not available!  Install boost graph library and recompile to enable."<<std::endl;
+#endif // HAVE_BOOST_GRAPH_LIB
+}
-- 
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