private function setLayout(AttributeAware $entity, array $layout)
{
$bag = new AttributeBagNamespaced($entity->getAttributeBag(), 'graphviz.');
$bag->setAttributes($layout);
return $entity;
}
protected function getLayoutEdge(Edge $edge)
{
$bag = new AttributeBagNamespaced($edge, 'graphviz.');
$layout = $bag->getAttributes();
// use flow/capacity/weight as edge label
$label = NULL;
$flow = $edge->getFlow();
$capacity = $edge->getCapacity();
// flow is set
if ($flow !== NULL) {
// NULL capacity = infinite capacity
$label = $flow . '/' . ($capacity === NULL ? '∞' : $capacity);
// capacity set, but not flow (assume zero flow)
} elseif ($capacity !== NULL) {
$label = '0/' . $capacity;
}
$weight = $edge->getWeight();
// weight is set
if ($weight !== NULL) {
if ($label === NULL) {
$label = $weight;
} else {
$label .= '/' . $weight;
}
}
if ($label !== NULL) {
if (isset($layout['label'])) {
$layout['label'] .= ' ' . $label;
} else {
$layout['label'] = $label;
}
}
return $layout;
}