code: function drawNodeCanvas(node, color) {
      var parent = node.getParent();
      var depth = node.getDepth();
      var offsetX = node.offset.x;
      var offsetY = node.offset.y;
      color = color || node.branchColor;
  
      var $node = $getNode(node);
      var $parent = $getNode(parent);
      var $canvas = $getNodeCanvas(node);
  
      drawLineCanvas($canvas, depth, offsetX, offsetY, $node, $parent, color);
    }
docs: Redraws a node's branch to its parent.
  
  @param {mindmaps.Node} node
  @param {String} optional color