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Generate a Graphviz legend template for causal knowledge graphs with node types and edge styles
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| name | graphviz.generate_legend |
| description | Generate a Graphviz legend template for causal knowledge graphs with node types and edge styles |
digraph WindTurbineCKG {
rankdir=LR;
splines=true;
nodesep=0.8;
ranksep=1.2;
bgcolor="white";
subgraph cluster_legend {
label="Legend: Node Types";
fontsize=11;
fontname="Helvetica";
color=gray70;
style="rounded,dashed";
bgcolor="white";
// Put every legend node on the SAME rank (same vertical alignment)
{ rank=same;
leg_exog; leg_op; leg_latent; leg_obs; leg_health; leg_out;
}
leg_exog [label="Exogenous /\nEnvironmental", shape=ellipse, style=filled, fontcolor=black, color=royalblue4, fillcolor=lightsteelblue1];
leg_op [label="Operational /\nMechanism", shape=box, style="rounded,filled,solid", fontcolor=black, color=darkgreen, fillcolor=palegreen1];
leg_latent [label="Latent /\nHidden State", shape=box, style="filled,dashed", fontcolor=gray40, color=gray40, fillcolor=gray90];
leg_obs [label="Observable\nSignal", shape=ellipse, style=filled, fontcolor=black, color=darkgreen, fillcolor=palegreen1];
leg_health [label="Health\nIndicator", shape=ellipse, style=filled, fontcolor=black, color=gray40, fillcolor=gray90];
leg_out [label="Outcome /\nTarget", shape=box, penwidth=2, style=filled, fontcolor=black, color=darkorange3, fillcolor=moccasin];
// Keep left-to-right ordering without changing ranks
leg_exog -> leg_op [style=invis, weight=10];
leg_op -> leg_latent [style=invis, weight=10];
leg_latent -> leg_obs [style=invis, weight=10];
leg_obs -> leg_health [style=invis, weight=10];
leg_health -> leg_out [style=invis, weight=10];
}
}
digraph legend {
graph [rankdir=TB, nodesep=0.5, ranksep=0.7];
node [shape=point, width=0, height=0, margin=0];
edge [dir=forward];
// Row 1: Direct causation
{
rank=same;
a1 [label="", style=invis];
b1 [label="", style=invis];
t1 [shape=plaintext, style=solid, label="Direct causation", fontsize=16, fontname="Arial"];
a1 -> b1 [style=solid, color=black, penwidth=3, arrowsize=1.2, minlen=3];
b1 -> t1 [style=invis, minlen=1];
}
// Row 2: Uncertain/hypothesized causation
{
rank=same;
a2 [label="", style=invis];
b2 [label="", style=invis];
t2 [shape=plaintext, style=solid, label="Uncertain / hypothesized causation", fontsize=16, fontname="Arial"];
a2 -> b2 [style=dotted, color=black, penwidth=2, arrowsize=1.0, minlen=3];
b2 -> t2 [style=invis, minlen=1];
}
// Row 3: Correlation/association
{
rank=same;
a3 [label="", style=invis];
b3 [label="", style=invis];
t3 [shape=plaintext, style=solid, label="Correlation / association (non-causal)", fontsize=16, fontname="Arial"];
a3 -> b3 [style=dotted, color=gray50, penwidth=2, arrowhead=none, minlen=3];
b3 -> t3 [style=invis, minlen=1];
}
// Row 4: Positive effect
{
rank=same;
a4 [label="", style=invis];
b4 [label="", style=invis];
t4 [shape=plaintext, style=solid, label="Positive effect (+ / ++ / +++)", fontsize=16, fontname="Arial"];
a4 -> b4 [style=solid, color="#228B22", penwidth=3, arrowsize=1.2, minlen=3];
b4 -> t4 [style=invis, minlen=1];
}
// Row 5: Negative effect
{
rank=same;
a5 [label="", style=invis];
b5 [label="", style=invis];
t5 [shape=plaintext, style=solid, label="Negative effect (- / -- / ---)", fontsize=16, fontname="Arial"];
a5 -> b5 [style=solid, color="#DC143C", penwidth=3, arrowsize=1.2, minlen=3];
b5 -> t5 [style=invis, minlen=1];
}
// Row 6: Strength encoding - using <-> instead of Unicode
{
rank=same;
a6 [label="", style=invis];
b6 [label="", style=invis];
t6 [shape=plaintext, style=solid, label="Strength encoding (weak <-> strong)", fontsize=16, fontname="Arial"];
a6 -> b6 [style=solid, color="#228B22", penwidth=3, arrowsize=1.2, minlen=3];
b6 -> t6 [style=invis, minlen=1];
}
// Force vertical ordering and left alignment
a1 -> a2 -> a3 -> a4 -> a5 -> a6 [style=invis];
b1 -> b2 -> b3 -> b4 -> b5 -> b6 [style=invis];
}