                               
                              3D-FONCTEUR v1.5
                             ------------------

VERSION: 1.5 UNREGISTERED
DATE:    1996, september

AUTHORS: L. Blanchard & S. Meyer,
         students at "L'Ecole Centrale de Lyon".

SUBJECT: This software allows you to draw parametric functions in
         2D and 3D (wireframe, hollow facets, colored facets).

         This is a SHAREWARE. You can distribute it freely but if you
         use it regularly and if you enjoy it, you must register.
         To register, fill in the form REGISTER.TXT.
         (only 65FF, or $14(US), or 8(UK), or 20 DM.)
         FOREIGN CURRENCY ACCEPTED.

HARDWARE REQUIRED: PC computer
                   VGA (color)
                   Arithmetical co-processor
                   Mouse

HOW TO USE IT:
         Execute "3DF-15.EXE".
         
         To draw a 2D function:
           
           - check that you are in 2D mode ([2-D]/[3-D] button).
           - enter x(t) and y(t) or load a function from HD (see forward).
           - possibly change the window size (click and enter new Xmin,...).
           - possibly modify the range of parameter 't'
             (click and enter t_min,...).
           - Activate [AUTOX] for an autoscale (of abscisses).
           - Idem for [AUTOY].
           - Activate [O] for an orthonormal window.
           - [Div] allows to change the number of plots.
             (the higher DIV is, the finer the graph is).

         To draw a 3D function:
           
           - See 2-D.
           - [AUTOX] is not available here.
           - The [u_min], [u_max] buttons are available.
           - The [Fil de fer]/[Faces caches]/[Facettes] button select
             the sort of the graph.
           - There are DIV facets !

         To load a function from the HD:
           
           - Press the [DISQUE] button.
           - Select the name of the function you want (on the left side).
             The function is on your right. 
           - Press [EXPORTER] or [ANNULER].

         To save a function (on the HD):

           - Enter the function (main window).
           - Change options (DIV, t_min, ...).
           - Press [DISQUE].
           - Select an empty name ("VIDE") (on the left side).
           - Press again this button to enter the name of the function.
           - Press [IMPORTER].
           - Press [SAUVER] and [ANNULER].

         Other

           - Zoom (Z+, Z-),
           - Differentiation (registered copy),
           - Integration,
           - Moving,
           - Cursor coordinates while following the graph,
           - Evaluation of PI, SQRT(PI) better than numerical values,
           - [F1] save the image as BMP,
           - [F2] save the image as BMP, but colors are inverted
             (for printing).


REGISTERED VERSIONS

           - You can have an english version,
           - No more boring delays,
           - Differentiation,
           - Full moving (Up, Down, Left, Right),
           - ZoomBox,
           - You can save your functions.


Please contact us if you experience any problem:
   
   By E-mail:  blancha@ec-lyon.fr
               meyer@ec-lyon.fr

   By mail:    V123 CLUB ELECTRONIQUE
               ECOLE CENTRALE DE LYON  
               36 Av. Guy de Collongue
               BP 163 69131 ECULLY Cedex
               FRANCE


Read the file ENREGIST.TXT for registering. (Price=65 FF/$14US).
