LINEANGLE Computes angle between two straight lines.

   A = lineAngle(LINE);
   Returns the angle between horizontal, right-axis and the given line.
   Angle is given in radians, between 0 and 2*pi, in counter-clockwise
   direction.

   A = lineAngle(LINE1, LINE2);
   Returns the directed angle between the two lines. Angle is given in
   radians between 0 and 2*pi, in counter-clockwise direction.

   See also
   lines2d, angles2d, createLine, normalizeAngle

   ---------
   author : David Legland 
   INRA - TPV URPOI - BIA IMASTE
   created the 31/10/2003.

Package: matgeom