Protein.Chain.centroid: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/protein.bend as Protein
Lines 144-147 of bend-prot@0.1.0.0/protein.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/protein.bend&start_line=144&end_line=147

import Base
import bend-prot@0.1.0.0/geom.bend as G

def Chain.centroid(c: Chain) -> G.Vec3:
  match c:
    case Chain{cid, residues}:
      centroid_of_sum(sum_count_atoms(flatten_residues(residues)))

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Chain
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=centroid_of_sum
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=flatten_residues
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=sum_count_atoms