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static CirclesAndLines calFromCoordinates(Map<S, Pt> coordinates, Collection<Relation> relations) {
  Rect r = mergeRects(map(f ptToRect, values(coordinates)));
  BufferedImage img = newBufferedImage(20, 20, Color.white);

  new CirclesAndLines cal;
  new HashMap<S, Circle> circles;
  for (S node : keys(coordinates)) {
    Pt p = coordinates.get(node);
    double x = ((p.x-r.x)/(double) r.w)*0.8+0.1;
    double y = ((p.y-r.y)/(double) r.h)*0.7+0.1;
    circles.put(node, cal.circle(img, x, y, node));
  }
  
  for (Relation rel : relations)
    if (rel.is("An arrow from * to *")) {
      Circle a = circles.get(rel.a()), b = circles.get(rel.b());
      if (a != null && b != null)
        cal.addArrow(a, b);
    }
  
  ret cal;
}