title: Calculating direction of rotation
body: <p>If I have four points in 2D space, which are then rotated m degrees, what is the best/ most efficient way to determine the direction(clockwise/counter clockwise) of the rotation.</p>
  
  <p>I know which point is which before and after rotation. </p>
  
  <p>I have tried taking into account the lowest point and the highest point (based on y value) and comparing the x difference e.g. (+ve or -ve) but this does not seem to be very reliable and I doubt it is an efficient solution.</p>