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I am looking for a way to visualize the graph constructed in Spark's Graphx. As far as I know Graphx doesn't have any visualization methods so I need to export the data from Graphx to another graph library, but I am stuck here. I ran into this website: https://lintool.github.io/warcbase-docs/Spark-Network-Analysis/ but it didn't help. Which library I should use and how to export the graph.
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If you're using grpahFrames, then I've modified the code provided by @Karol Sudol in his answer for GraphFrames:
def drawGraph[vertices:ClassTag,relations:ClassTag](g:GraphFrame) = {
val u = java.util.UUID.randomUUID
val v = g.vertices.select("id")
val vertexes: Array[String] = g.vertices.select("id").rdd.map(x => x(0).toString).collect()
val edges: Array[Array[String]] = g.edges.select("src", "dst").rdd.map(r => Array(r(0).toString, r(1).toString)).collect()
val edgeCreation = edges.map{ edgeArray =>
"{source:nodes["+ vertexes.indexOf(edgeArray(0).trim()) +"],target:nodes["+ vertexes.indexOf(edgeArray(1).trim())+"]}"
}
println("""
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Graph</title>
<div id='a""" + u + """' style='width:960px; height:500px'></div>
<style>
.node circle { fill: gray; }
.node text { font: 10px sans-serif;
text-anchor: middle;
fill: white; }
line.link { stroke: gray;
stroke-width: 1.5px; }
</style>
<script src="https://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<script>
var width = 960, height = 500;
var svg = d3.select("#a""" + u + """").append("svg")
.attr("width", width).attr("height", height);
var nodes = [""" + vertexes.map("{id:\"" + _ + "\"}").mkString(",") + """];
var links = ["""+ edgeCreation.mkString(",") + """];
var link = svg.selectAll(".link").data(links);
link.enter().insert("line", ".node").attr("class", "link");
var node = svg.selectAll(".node").data(nodes);
var nodeEnter = node.enter().append("g").attr("class", "node")
nodeEnter.append("circle").attr("r", 8);
nodeEnter.append("text").attr("dy", "0.35em")
.text(function(d) { return d.id; });
d3.layout.force().linkDistance(50).charge(-200).chargeDistance(300)
.friction(0.95).linkStrength(0.5).size([width, height])
.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}).nodes(nodes).links(links).start();
</script>
</body>
</html>
""")
}
So you can do something like this
def toGexf[VD,ED](g:Graph[VD,ED]) : String = { "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + "<gexf xmlns=\"http://www.gexf.net/1.2draft\" version=\"1.2\">\n" + " <graph mode=\"static\" defaultedgetype=\"directed\">\n" + " <nodes>\n" + g.vertices.map(v => " <node id=\"" + v._1 + "\" label=\"" + v._2 + "\" />\n").collect.mkString + " </nodes>\n" + " <edges>\n" + g.edges.map(e => " <edge source=\"" + e.srcId + "\" target=\"" + e.dstId + "\" label=\"" + e.attr + "\" />\n").collect.mkString + " </edges>\n" + " </graph>\n" + "</gexf>" }
Example: http://gregroberts.github.io
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