Function removeNode

ch/graphic-sequence/app.js:119–134

(d, i)

//d is data, i is index according to selection
function removeNode(d, i) {
  //to make ctrl-drag works for mac/osx users
  if (d3.event.ctrlKey) return;
  var linksToRemove = links.filter(function(l) {
    return l.source === d || l.target === d;
  });
  linksToRemove.map(function(l) {
    l.source.degree--;
    l.target.degree--;
    links.splice(links.indexOf(l), 1);
  });
  nodes.splice(nodes.indexOf(d), 1);
  d3.event.preventDefault();
  restart();
  showGraphLatex();
}

function removeEdge(d, i) {
  d.source.degree--;