Merge pull request #271 from anyazz/manual-ranking

Add support for manual ranking

Author: rustedgrail

lib/layout.js

@@ -97,7 +97,7 @@ function updateInputGraph(inputGraph, layoutGraph) {
 let graphNumAttrs = ["nodesep", "edgesep", "ranksep", "marginx", "marginy"];
 let graphDefaults = { ranksep: 50, edgesep: 20, nodesep: 50, rankdir: "tb" };
 let graphAttrs = ["acyclicer", "ranker", "rankdir", "align"];
-let nodeNumAttrs = ["width", "height"];
+let nodeNumAttrs = ["width", "height", "rank"];
 let nodeDefaults = { width: 0, height: 0 };
 let edgeNumAttrs = ["minlen", "weight", "width", "height", "labeloffset"];
 let edgeDefaults = {

lib/rank/index.js

@@ -27,10 +27,16 @@ module.exports = rank;
  *       fix them up later.
  */
 function rank(g) {
+  var ranker = g.graph().ranker;
+  if (ranker instanceof Function) {
+    return ranker(g)
+  }
+
   switch(g.graph().ranker) {
   case "network-simplex": networkSimplexRanker(g); break;
   case "tight-tree": tightTreeRanker(g); break;
   case "longest-path": longestPathRanker(g); break;
+  case "none": break;
   default: networkSimplexRanker(g);
   }
 }