title: php: library for drawing this specific graph
body: <p>I would like to ask you if you know any concrete library that is capable of drawing graph like:</p>
  
  <p><img src="https://i.stack.imgur.com/l1Aw3.png" alt="enter image description here"></p>
  
  <p>so this is variation of something I would call "doube bipartitiate graph". Vertical lines just illustrate columns and i do not mean to draw a graph that look like sequence graph - just all nodes should lay somewhere on them. This picture illustrates what I mean:</p>
  
  <p><img src="https://i.stack.imgur.com/FHXve.png" alt="enter image description here"></p>
  
  <p>The only thing we have found so far is <a href="http://js-graph-it.sourceforge.net/index.html" rel="nofollow noreferrer">js.graph</a> but it seems like it is a lot of work to make it look like it. Also, google charts does not seem appropriate. Any ideas?</p>