function center(node) {
  return node.targetLinks.length ? node.depth : node.sourceLinks.length ? min(node.sourceLinks, targetDepth) - 1 : 0;
}
function center(node) {
  return node.targetLinks.length ? node.depth : node.sourceLinks.length ? min(node.sourceLinks, targetDepth) - 1 : 0;
}
function center ( node ) { return node . targetLinks . length ? node . depth : node . sourceLinks . length ? min ( node . sourceLinks , targetDepth ) - 1 : 0 ; }
The depth of a node when the nodeAlign (align) is set to 'center'
The depth of a node when the nodeAlign ( align ) is set to center