title: Google Charts: Line graph + points?
body: <p>I have got line graph that shows value change in time. It works but I thought it would be great if I could add <strong>points</strong> that shows tooltip on hover. Something like this: <img src="https://i.stack.imgur.com/XBqB3.png" alt="enter image description here"> <strong>But</strong> I cannot use tooltip directly on one of those points.</p>
  
  <pre><code>var data = google.visualization.arrayToDataTable([
      ['time', 'value'],
      ['12:00',   1],
      ['13:00',   5],
      ['14:00',   8],
      ['15:00',   12],
      ['16:00',   11],
      ['17:00',   15],
  
  ]);
  
  new google.visualization.LineChart(document.getElementById('visualization')).
    draw(data, {});
  </code></pre>