Setting default node attributes using Image_Graphviz package

Question

I can create the graph below using either a point language using GraphViz directly, or using the PEAR Image_GraphViz package using PHP.

//DOT language digraph test{ URL="http://example.com/fish/"; bgcolor="#BBCAF2"; //defaults for all nodes node[style=filled, fillcolor=white, color="#8A94B4", fixedsize=true, fontname="sans-serif", fontsize=8, URL="?fish_id=\N", margin="0.02,0.02"]; //defaults for all edges edge[arrowsize=0.6, sametail=true, fontsize=8, fontname="sans-serif"]; //a few edges 57->23[color="blue"]; 42->23[color="red"]; 25->26[color="blue", label="10M"]; 25->26[color="red", label="10F"]; //etc. //a few nodes 29[label="100128 AB"]; 38[label="100730 AB"]; 39[label="110208"]; //etc. } 

Dot files can set default attributes for all four element types (graph, cluster, node, edge). It seems that Image_GraphViz can only set default values ​​for graph level attributes.

 <?php $gatts=array( //defaults for graph level attributes 'URL'=>"http://example.com/fish/", 'bgcolor'=>"#ff0000", 'font'=>"sans-serif", ); $gv=new Image_GraphViz(true,$gatts,'test',false,true); $q_ne="SELECT parentname, parent_id, childname, child_id, parenttype, parentcount FROM fish_crosses"; $r_ne=$dbii->query($q_ne); while($ne=$r_ne->fetch_assoc()){ $nodeatts=array('label' => $ne['parentname'], 'style'=>"filled", 'fillcolor'=>'#ffffff', 'fixedsize'=>true, 'fontname'=>"sans-serif", 'fontsize'=>8); if(!$ne['child_id']) { $gv->addNode($ne['parent_id'], $nodeatts); continue; } if($ne['parenttype']=='dam'){ $ecolor= '#ff0000'; $elabel= $ne['parentcount'].'F'; } else { $ecolor= '#0000ff'; $elabel=$ne['parentcount'].'F'; } $edgeatts=array('color'=>$ecolor, 'fontname'=>'sans-serif','fontsize'=>8); if($ne['parentcount']) $edgeatts['label']=$elabel; $gv->addEdge(array($ne['parent_id']=>$ne['child_id']), $edgeatts); $gv->addNode($ne['parent_id'], $nodeatts); $gv->addNode($ne['child_id'], $nodeatts); } echo $gv->image('png'); ?> 

Does anyone know the syntax for adding default attribute values ​​for nodes and edges to an Image_GraphViz object?

Answer 1

It seems that the current Image_GraphViz package cannot handle the default attributes of node / edge / cluster. I expanded the class by changing these functions: _escape , _escapeArray and parse . Here are my changes:

 function _escape($input, $html = false) { switch (strtolower($input)) { //removed case 'node' and case 'edge' so they won't be quoted case 'graph': case 'digraph': case 'subgraph': case 'strict': return '"'.$input.'"'; } //... function _escapeArray($input) { //... default: if(is_array($v)){ $v=$this->_escapeArray($v); //added recursion to allow default node/edge/cluster attribute sets } else { $v = $this->_escape($v); } $k = $this->_escape($k); } //... function parse() { //... foreach ($attr as $key => $value) { if(is_array($value)){ $a=implode(',', array_map(function($v,$k){ return $k . '='.$v;}, array_values($value), array_keys($value))); //default format for node/edge/cluster: thing[att1="blah", att2="foo"]; $parsedGraph .= $indent.$key.'['.$a."];\n"; } else { $parsedGraph .= $indent.$key.'='.$value.";\n"; } } //... 

I hope this is useful to someone.

Answer 2

This is just an idea, I can’t check it: did you try just adding a node named node (or edge) and define attributes on that node?

Something like $gv->addNode('node', array('style'=>'filled', 'fixedsize'=>true))