md`# MEP Schematics Series
One of a series of experiments in automatic layout of MEP schematics diagrams of a simple building air supply system.
See also:
- [mep-air-handling-force-directed-graph](https://observablehq.com/@lacunae/mep-air-handling-force-directed-graph)
- [mep-schematics-cluster-dendrogram](https://observablehq.com/@lacunae/mep-schematics-cluster-dendrogram)
- [mep-schematics tidy-tree](https://observablehq.com/@lacunae/tidy-tree)
- [mep-schematics-radial-tidy-tree](https://observablehq.com/@lacunae/mep-schematics-radial-tidy-tree)
- [mep-schematics-radial-tidy-tree](https://observablehq.com/@lacunae/mep-schematics-tree-of-life)`
data = FileAttachment("dGraph1.json").json()
height = 600
color = {
const scale = d3.scaleOrdinal(d3.schemeCategory10);
return d => scale(d.group);
}
drag = simulation => {
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
return d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
d3 = require("d3@5")
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