Question

I m trying to build a Graphviz graph containing record vertices using QuickGraph. So far, I have this:

var algo = new GraphvizAlgorithm<Entity, EntityEdge>(this);
algo.CommonVertexFormat.Shape = GraphvizVertexShape.Record;
algo.CommonVertexFormat.Style = GraphvizVertexStyle.Filled;
algo.FormatVertex += new FormatVertexEventHandler<Entity>(FormatVertex);

private void FormatVertex(object sender, FormatVertexEventArgs<Entity> e) {
    Entity ent = e.Vertex;
    GraphvizRecord rec = new GraphvizRecord();

    GraphvizRecordCell rootCell = new GraphvizRecordCell();
    rootCell.Text = ent.ClassName + "\n" + ent.TargetName;

    var inputs = ent.GetUniqueInputNames();

    foreach (string input in inputs) {
        GraphvizRecordCell cell = new GraphvizRecordCell();
        cell.Text = input;
        cell.Port = input;
        rootCell.Cells.Add(cell);
    }

    rec.Cells.Add(rootCell);

    e.VertexFormatter.Record = rec;
}

When I generate the graph, however, the vertices show a label instead of a record. What am I doing wrong?

EDIT

Here s the dot output.

digraph G {
    bgcolor="#454545FF"
    node [fillcolor="#505050FF", color="#2A2A2AFF", shape=record, fontname="Verdana",  fontsize=10, label="", style=filled, fontcolor="#FFFFFFFF"];
    edge [ fontsize=10, fontcolor="#FFFFFFFF", color="#ECA706FF", fontname="Verdana"];
    0 [label="EntityMap.Entity"];
    1 [label="EntityMap.Entity"];
    2 [label="EntityMap.Entity"];
    3 [label="EntityMap.Entity"];
    4 [label="EntityMap.Entity"];
    5 [label="EntityMap.Entity"];
    6 [label="EntityMap.Entity"];
    7 [label="EntityMap.Entity"];
    8 [label="EntityMap.Entity"];
    9 [label="EntityMap.Entity"];
    10 [label="EntityMap.Entity"];
    11 [label="EntityMap.Entity"];
    12 [label="EntityMap.Entity"];
    13 [label="EntityMap.Entity"];
    14 [label="EntityMap.Entity"];
    15 [label="EntityMap.Entity"];
    0 -> 0 [ label="OnPlayerUse", headport="EnableMotion", headlabel=""];
    0 -> 1 [ label="OnPlayerUse", headport="Explode", headlabel=""];
    0 -> 6 [ label="OnPlayerUse", headport="Compare", headlabel=""];
    0 -> 5 [ label="OnPlayerUse", headport="RevertToDefaultRelationship", headlabel=""];
    3 -> 4 [ label="OnTrigger", headport="Wake", headlabel=""];
    4 -> 2 [ label="OnFoundEnemy", headport="Display", headlabel=""];
    6 -> 15 [ label="OnEqualTo", headport="EmitAISound", headlabel=""];
    6 -> 4 [ label="OnEqualTo", headport="Wake", headlabel=""];
    7 -> 8 [ label="OnStartTouch", headport="Command", headlabel="+duck"];
    7 -> 8 [ label="OnEndTouch", headport="Command", headlabel="-duck"];
    7 -> 9 [ label="OnEndTouch", headport="Enable", headlabel=""];
    7 -> 10 [ label="OnEndTouch", headport="Fade", headlabel=""];
    7 -> 7 [ label="OnEndTouch", headport="Disable", headlabel=""];
    12 -> 11 [ label="OnMapSpawn", headport="Fade", headlabel=""];
    13 -> 6 [ label="OnPass", headport="SetValue", headlabel="1"];
    14 -> 6 [ label="OnPass", headport="SetValue", headlabel="1"];
}

Answer 1

There are details missing in the root cells, specifically the names of the object methods. I guess the dotoutput line

0 [label="EntityMap.Entity"];

...should really be:

0 [label="<EnableMotion> EntityMap.Entity"];

(...and I guess they shouldn t all be named EntityMap.Entity?)

I cannot really tell where in your program the edges are introduced, but it seems like the edges are rendered based on different information than the vertices.

Running dot manually (dot foo.dot -Tpng -o foo.png) might give you more informative error/warning messages.

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