Function gridGraph

code/chapter/22_fast.js:33–43

(size)

}

function gridGraph(size) {
  let grid = new Graph();
  for (let y = 0; y < size; y++) {
    for (let x = 0; x < size; x++) {
      let id = grid.addNode();
      if (x > 0) grid.addEdge(id, id - 1);
      if (y > 0) grid.addEdge(id, id - size);
    }
  }
  return grid;
}

var springLength = 20;
var springStrength = 0.1;