code: public static final boolean collinear(final Point2D p1, final Point2D p2, final Point2D p3)
      {
          return Geometry.collinear(p1, p2, p3);
      }
docs: Returns whether the 3 points are colinear, i.e. whether they lie on a single straight line.
  
  @param p1
  @param p2
  @param p3
  @return
  
  @see <a href="http://mathworld.wolfram.com/Collinear.html">Collinear in Wolfram MathWorld</a>