Generates a D3 quadtree visit function that performs a series of operations on each visited node.

combinevisitfunctions.js

  function combineVisitFunctions() {
    var fns = arguments;
    return function combinedVisit(node, x1, y1, x2, y2) {
      for (var i = 0; i < fns.length; ++i) {
        fns[i](node, x1, y1, x2, y2);
      }
    };
  }