private void DrawStraightLineFromCurrentEventSourcePointTo(Vector2 to, NodeEvent eventSource)
{
if (eventSource == null) {
return;
}
var p = eventSource.point.GetGlobalPosition(eventSource.eventSourceNode);
Handles.DrawLine(new Vector3(p.x, p.y, 0f), new Vector3(to.x, to.y, 0f));
}