title: Pchart: X axis, too many ticks
body: <p>I have quite a large dataset, about a 1000 values. (temperature graph)   </p>
  
  <p><a href="https://i.stack.imgur.com/9yQ0O.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9yQ0O.png" alt="temperature graph"></a>
  
  <br>
  As you can see i have too many ticks between the hours, i only want one tick per hour.<br>
  Now it's a very think black line, how can i fix this?</p>
  
  <p>The x axis array is like this:<br>
      [2] = 1<br>
      [3] = NULL<br>
      [4] = NULL<br>
      [5] = 2<br>
      [6] = NULL<br>
      etc</p>