                               
                              3D-FONCTEUR v1.4
                             ------------------

VERSION: 1.4
DATE:    january 1996

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 50FF, or $10(US), or 5(UK), or 15 DM.)
         FOREIGN CURRENCY ACCEPTED.

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

HOW TO USE IT:
         Execute "3DF-14.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].

         Special keys (unregistered version)

           - [PGDOWN] and [PGUP] respectively to zoom in and zoom out.
           - Arrow keys to move the window (to the left, right, up and down).


REGISTERED VERSIONS: will include following facilities:

           - Zoom (IN, OUT and BOX ZOOM).    
           - Moving.
           - Cursor coordinates while following the graph.
           - Integration.
           - Differentiation.
           - Evaluation of PI, SQRT(PI) better than numerical values.
           - You can have an english version.

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

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


Cf. le fichier ENREGIST.TXT pour l'enregistrement. (Contribution=50 FF).
