graph_wrapper.cpp

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#include <mtt/graph_wrapper.h>

Agnode_t*GVGraph::selectNode(string&name)
{
        map<string, Agnode_t*>::iterator it = _nodes.find(name);
        if(it!=_nodes.end())
                return it->second;
        else
                return NULL;
}

Agedge_t*GVGraph::selectEdge(string&source,string&target)
{
        pair<string, string> key; //= std::make_pair<string,string>(source,target);
        key.first = source;
    key.second = target;
        
        if(_edges.find(key)!=_edges.end())
        return _edges[key];
    
    return NULL;
}
                
int GVGraph::setNodeAttribute(string name,string attribute,string value)
{
        return agsafeset(selectNode(name),const_cast<char*>(attribute.c_str()),const_cast<char*>(value.c_str()),const_cast<char*>(""));

//      return _agset(selectNode(name),attribute,value);
}

int GVGraph::setEdgeAttribute(string source,string target,string attribute,string value)
{
        return agsafeset(selectEdge(source,target),const_cast<char*>(attribute.c_str()),const_cast<char*>(value.c_str()),const_cast<char*>(""));

//      return _agset(selectEdge(source,target),attribute,value);
}

void GVGraph::startRender()
{
        gvRender(_context,_graph,(char*)"xgtk",NULL);
}
                
GVC_t*GVGraph::getGVCcontext(void)
{
        return _context;
}

Agraph_t* GVGraph::_agopen(string name,int kind)
{
        return agopen(const_cast<char*>(name.c_str()),kind);
}

string GVGraph::_agget(void*object,string attr,string alt)
{
    string str=agget(object, const_cast<char*>(attr.c_str()));

    if(str==string())
        return alt;
    else
        return str;
}

int GVGraph::_agset(void*object,string attr,string value)
{
        return agsafeset(object, const_cast<char*>(attr.c_str()),const_cast<char*>(value.c_str()),const_cast<char*>(value.c_str()));
}

Agsym_t* GVGraph::_agnodeattr(string name,string value)
{
        return agnodeattr(_graph,const_cast<char*>(name.c_str()),const_cast<char*>(value.c_str()));
}

Agsym_t* GVGraph::_agedgeattr(string name,string value)
{
        return agedgeattr(_graph,const_cast<char*>(name.c_str()),const_cast<char*>(value.c_str()));
}
Agnode_t* GVGraph::_agnode(string name)
{
        return agnode(_graph,const_cast<char*>(name.c_str()));
}

int GVGraph::_gvLayout(GVC_t*gvc,graph_t*graph,string engine)
{
        return gvLayout(gvc,graph,engine.c_str());
}

GVGraph::GVGraph(string name,double node_size):
        _context(gvContext()),
        _graph(_agopen(name, AGDIGRAPHSTRICT)) // Strict directed graph, see libgraph doc
{
    //Set graph attributes
//     _agset(_graph, "overlap", "prism");
//     _agset(_graph, "splines", "true");
//     _agset(_graph, "pad", "0,2");
//     _agset(_graph, "dpi", "96,0");
    _agset(_graph, "nodesep", "0.1");
//      _agset(_graph, "ranksep", "2.0");
//      _agset(_graph, "landscape","true");
//      _agset(_graph, "center","true");
//      _agset(_graph, "aspect","1");
//      _agset(_graph, "forcelabels","true");
        _agset(_graph, "rankdir","LR");
//      _agset(_graph, "style","filled");

        
    //Set default attributes for the future nodes
    _agnodeattr("shape", "box");
        _agnodeattr("height", "0.02");
        
//     _agnodeattr(_graph, "label", "");
//     _agnodeattr(_graph, "regular", "true");

    //Divide the wanted width by the DPI to get the value in points
//      double dpi=lexical_cast<double>(_agget(_graph, "dpi", "96,0"));
//     string nodePtsWidth= lexical_cast<string>(node_size/dpi);
        
        //GV uses , instead of . for the separator in floats
//      replace(nodePtsWidth.begin(), nodePtsWidth.end(), '.', ',');
        
//      cout<<"nodePtsWidth:"<<nodePtsWidth<<endl;
//     _agnodeattr(_graph, "width", nodePtsWidth);
}

GVGraph::~GVGraph()
{
    gvFreeLayout(_context, _graph);
    agclose(_graph);
    gvFreeContext(_context);
}

void GVGraph::addNode(const string& name)
{
    if(_nodes.find(name)!=_nodes.end())
        removeNode(name);

    _nodes.insert(pair<string,Agnode_t*>(name, _agnode(name)));
}

void GVGraph::addNodes(vector<string>& names)
{
    for(uint i=0; i<names.size(); ++i)
        addNode(names[i]);
}

void GVGraph::removeNode(const string& name)
{
        string nn=name;
        
    if(_nodes.find(name)!=_nodes.end())
    {
        agdelete(_graph, _nodes[name]);
        _nodes.erase(name);

                map< pair<string,string>, Agedge_t*>::iterator it;
                
                for(it=_edges.begin();it!=_edges.end();it++)
                {
                        if(it->first.first==nn || it->first.second==nn)
                                removeEdge(it->first.first,it->first.second);
                }
    }
}

void GVGraph::clearNodes()
{
        map<string, Agnode_t*>::iterator it;

        vector<string>names;
        
        for(it=_nodes.begin();it!=_nodes.end();it++)
                names.push_back(it->first);
        
        for(uint i=0;i<names.size();i++)
                removeNode(names[i]);
}

void GVGraph::setRootNode(const string& name)
{
    if(_nodes.find(name)!=_nodes.end())
        _agset(_graph, "root", name);
}

void GVGraph::addEdge(const string &source, const string &target)
{
    if(_nodes.find(source)!=_nodes.end() && _nodes.find(target)!=_nodes.end())
    {
                pair<string,string> key(source,target);
                
        if(_edges.find(key)==_edges.end())
            _edges.insert( pair< pair<string,string >, Agedge_t* >(key, agedge(_graph, _nodes[source], _nodes[target])));
    }
}

void GVGraph::removeEdge(const string &source, const string &target)
{
    removeEdge(pair<string,string>(source, target));
}

void GVGraph::removeEdge(const pair<string, string>& key)
{
    if(_edges.find(key)!=_edges.end())
    {
        agdelete(_graph, _edges[key]);
        _edges.erase(key);
    }
}

void GVGraph::freeLayout()
{
    gvFreeLayout(_context, _graph);
}

void GVGraph::applyLayout()
{
    _gvLayout(_context, _graph, "dot");
}