Function randomLayout

code/chapter/22_fast.js:24–31

(graph)

}

function randomLayout(graph) {
  let layout = [];
  for (let i = 0; i < graph.size; i++) {
    layout.push(new Vec(Math.random() * 1000,
                        Math.random() * 1000));
  }
  return layout;
}

function gridGraph(size) {
  let grid = new Graph();