title: How can I animate coordinate data in gnuplot?
body: <p>I have 4 sets of coordinate data (2D, let's say it represents a square at different positions). How can I animate their positions in gnuplot (please recommend if other programs are easier to achieve this) so that it looks like it is rotating counter-clockwise?</p>
  
  <p>Position 1:</p>
  
  <p><code>1 1
  3 1
  3 3
  1 3</code></p>
  
  <p>Position 2:</p>
  
  <p><code>-1 1
  -3 1
  -3 3
  -1 3</code></p>
  
  <p>Position 3:</p>
  
  <p><code>-1 -1
  -3 -1
  -3 -3
  -1 -3</code></p>
  
  <p>Position 4:</p>
  
  <p><code>1 -1
  3 -1
  3 -3
  1 -3</code></p>