/**
* Creates a specific dot-graph edge for the given state-transition.
*
* @param TransitionInterface $transition
* @param string $state_name
* @param string $event_name
*
* @return string
*/
protected function createEdge(TransitionInterface $transition, $state_name, $event_name)
{
$from_node = $this->node_id_map[$state_name];
$to_node = $this->node_id_map[$transition->getOutgoingStateName()];
$transition_label = $event_name === StateMachine::SEQ_TRANSITIONS_KEY ? '' : $event_name;
if ($transition->hasGuard()) {
$transition_label .= $transition->getGuard();
}
$attributes = [sprintf('label="%s"', trim(addslashes($transition_label))), sprintf('fontname="%s"', $this->getStyle('edge.fontname', self::EDGE_FONTNAME)), sprintf('fontsize="%s"', $this->getStyle('edge.fontsize', self::EDGE_FONTSIZE)), sprintf('fontcolor="%s"', $this->getStyle('edge.fontcolor', self::EDGE_FONTCOLOR))];
$attributes[] = sprintf('color="%s"', $this->getEdgeColor($event_name));
return sprintf('%s -> %s [%s]', $from_node, $to_node, implode(' ', $attributes));
}
