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+%% Copyright (c) 2011, INRA
+%% 2007-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% Redistribution and use in source and binary forms, with or without
+%% modification, are permitted provided that the following conditions are met:
+%%
+%% 1. Redistributions of source code must retain the above copyright notice, this
+%%    list of conditions and the following disclaimer.
+%%     
+%% 2. Redistributions in binary form must reproduce the above copyright notice, 
+%%    this list of conditions and the following disclaimer in the documentation
+%%    and/or other materials provided with the distribution.
+%%
+%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+%% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+%% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+%% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+%% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+%% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+%% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+%% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+%% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+%% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+%% POSSIBILITY OF SUCH DAMAGE.
+%%
+%% The views and conclusions contained in the software and documentation are
+%% those of the authors and should not be interpreted as representing official
+%% policies, either expressed or implied, of copyright holder.
+
+
+Description of the geom2d library.
+
+The aim of geom2d library is to handle and visualize geometric primitives such
+as points, lines, circles and ellipses, polylines and polygons...  It provides
+low-level functions for manipulating geometrical primitives, making easier the
+development of more complex geometric algorithms.   
+ 
+Some features of the library are:
+ 
+- creation of various shapes (points, circles, lines, ellipses, polylines,
+    polygons...) through an intuitive syntax. 
+    Ex: createCircle(p1, p2, p3) to create a circle through 3 points.  
+ 
+- derivation of new shapes: intersection between 2 lines, between line and
+    circle, between polylines... or point on a curve from its parametrisation
+ 
+- functions for polylines and polygons: compute centroid and area, expand, 
+    self-intersections, clipping with half-plane...  
+ 
+- manipulation of planar transformation. Ex.:
+    ROT = createRotation(CENTER, THETA);
+    P2 = transformPoint(P1, ROT);  
+ 
+- direct drawing of shapes with specialized functions. Clipping is performed 
+    automatically for infinite shapes such as lines or rays. Ex:
+    drawCircle([50 50 25]);     % draw circle with radius 25 and center [50 50]
+    drawLine([X0 Y0 DX DY]);    % clip and draw straight line
+ 
+- measure distances (between points, a point and a line, a point and a group
+    of points), angle (of a line, between 3 points), or test geometry (point
+    on a line, on a circle).  
+ 
+Additional help is provided in geom/Contents.m file, as well as summary files
+    like 'points2d.m' or 'lines2d.m'.