Function _updateEdge

chapter24/docs/d3-graphviz.js:1484–1490

(edge, x1, y1, x2, y2, attributes, options)

    return this;
  }
  function _updateEdge(edge, x1, y1, x2, y2, attributes, options) {
    var newEdge = createEdge.call(this, attributes);
    var edgeData = extractAllElementsData(newEdge);
    edge.data([edgeData]);
    attributeElement.call(edge.node(), edgeData);
    _moveEdge(edge, x1, y1, x2, y2, attributes, options);
  }
  function _moveEdge(edge, x1, y1, x2, y2, attributes, options) {
    var shortening = options.shortening || 0;
    var arrowHeadLength = 10;