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      TRAAXE           plot of axes and graduations
      TRACLE           legends
</PRE>
<P>
Below follows a flowchart corresponding to the creation of the axes of <b> VIS3XX</b> indicating, 
for a given command level,
 the results or movements within the tree for a given response.
<P>
<P>
<P>
<PRE>                         ---------------
                         AXES GRAPH_MENU
                         ---------------

 [COMMAND_LEVEL 0 ]
 ---------------------

   1    ( or aspect )        ===&gt; [A]
   2    ( or mod_const)      ===&gt; [B]
   3    ( or leg_axes )      ===&gt; [C]
   4    ( or nb_axes )       ===&gt; [D]
   5    ( or edit_contr)     ===&gt; [E]
   6    ( or (return) )      ===============&gt; QUIT_DIALOGUE

 [A] : Graduation_aspect   (level 1)
 ------------------------------------
      Modify_reference_box ?
      no     ===============&gt; [A1]
      yes    
             &lt;-- new value

      [A1] : Modify_color_axes ?
      no     ===========================&gt; [ COMMANDS_LEVEL 0 ]
      yes
             &lt;-- new R,V,B   (3 values)
             ===========================&gt; [ COMMANDS_LEVEL 0 ]

 [B] : Construction_of_axes_mode   (level 1)
 ---------------------------------------------
      Modify_current_mode ?
      nn    =======&gt; [COMMANDS_LEVEL 0 ]  or [X1] depending on the mode value
      yes
             -1      ====================&gt;  [ COMMANDS_LEVEL 0 ]     
              1      ====================&gt;  [ COMMANDS_LEVEL 0 ]     
              2      =============&gt;  [X1]

      [X1] : Manual_construction (level 2)
      ----------------------------------------
            Change_current_number_of_axis ?
            no  ==============================&gt; [X11]
            yes
                 &lt;-- new value ( 1 to 10)
            [X11] : parameters defining the axes
                    --&gt; Loop over the number of axes
                    |      REP  number of point of departure
                    |      REP  number of final point
                    |      REP  value of point of departure
                    |      REP  value of final point
                    |      REP  graduation scale code
                    |      REP  output code 
                    |      REP  construction mode of graduations
                    |      REP  write format for numbers
                    |      REP  line thickness
                    |      REP  character enlargement factor in x
                    |      REP  character enlargement factor in y
                    |      REP  enlargement factors for dashes
                    |      REP  number of reference intervals 
                    |      REP  number of sub-intervals
                    |      REP  length of elementary interval
                    |   Legend_on_axis ?
                    |      REP no   ==================&gt; [X12]
                    |          yes
                    |              REP  legend
                    |              frame legend ?
                    |                   REP yes
                    |                       no
                    |                   Position of legend ?
                    |                   REP value ( 1 to 8)
                    |  [X12] : Vector (+axis)  determine printing plane
                    |          REP  U1,U2,U3
                    |-----------------------------------------&lt;
       ====================  QUIT !!!  =====================&gt;

 [C] : Axis_legend   (level 1)
 ------------------------------
       Definition or Modification of legends on the axes ?
       no          =======================&gt; [ COMMANDS_LEVEL 0 ]
       yes
         --&gt;   Loop over 3 main axes
         |     Modify legend axis i ?
         |           no   ==========&gt; end of loop
         |           yes
         |               &lt;--  new legend
         |-----------------------------------&lt;
      ===============================&gt; [ COMMANDS_LEVEL 0 ]

 [D] : Number_of_axes  (level 1)
 ------------------------------
      Modify the current number of axes?
      no     ========================&gt; [ COMMANDS_LEVEL 0 ]
      yes
          &lt;-- new value
              ================================&gt; [ COMMANDS_LEVEL 0 ]

 [E] : Edit the axis parameters    (level 1)
 ---------------------------------------------------
      Verify axes parametres ?
      no          =======================&gt; [ COMMANDS_LEVEL 0 ]
      yes
         -- &gt; [E1] : Number of axis to verify ?
         |           0   ===============&gt; [ COMMANDS_LEVEL 0 ]
         |           i   ( i&gt;0 and i&lt;10  ======&gt; [E2]
         |
         |          --&gt; [E2] :  Label number ?
         |          |           0        ==================&gt; [E1]
         |          |
         |          |           1  (numbers of points defining the axis)
         |          |              I1(i),I2(i) ================&gt; [E2]
         |          |
         |          |           2  (extremity values)
         |          |              V1(i),V2(i) ================&gt; [E2]
         |          |
         |          |           3  (Reference indicator)
         |          |              IREF(i)     ================&gt; [E2]
         |          |
         |          |           4  (Graduation mode and parameters)
         |          |               MODG(i),NGRAD(i),NSUB(i),XINT(i)
         |          |                  ========================&gt; [E2]
         |          |
         |          |           5  (Number format)
         |          |              NF(i)   ====================&gt; [E2]
         |          |
         |          |           6  (Reference frequence on axis)
         |          |              NFG(i)  ====================&gt; [E2]
         |          |
         |          |           7  (Amplification factors for characters)
         |          |              XHX(i),XHY(i)  =============&gt; [E2]
         |          |
         |          |           8  (Amplification factor for dashes)
         |          |              XTIR(i)   ==================&gt; [E2]
         |          |
         |          |           9  (Line thickness)
         |          |              EP(i)     ==================&gt; [E2]
         |          |
         |          |           10 (Legend position)
         |          |              IPLA(i)  ===================&gt; [E2]
         |          |
         |          |           11 (Legend)
         |          |              new legende  ===============&gt; [E2]
         |          |
         |          |           12 (Vector (+axis) defining print plane)
         |          |              D1(i),D2(i),D3(i) ==========&gt; [E2]
         |          |
         |          |-----------------------------------------&lt;
         |----------------------------------------------------------&lt;
</PRE>
<P>
Below follows a simplified tree of <b> VIS3XX</b>:
<P>
<PRE>    VIS3XX    preprocessor 
    VIS3DW    general program
    V3DIN     initializations
    V3DFXY    function definitions 
    V3DAFF    definitions of display conditions
    WILLIT  WRIGTT   plot
    ECREF   ECREF1   legends
</PRE>
<P>
The tree of <b> TRPRXX</b> is schematically given as:
<P>
<PRE>  

    TRPRXX    preprocessor
    TRPROW    questioner
       PRMUAM  read matrix
       DEFGRA  axes and graduations
    TRAKOU    the general module  (see {\bf TRACXX})
</PRE>
<P>
The tree of <b> TRPOXX</b> is schematically given as:
<P>
<PRE>  

    TRPOXX    preprocessor
    TRPOIW    questioner
       TRPOIN  the general module
         LIRLIG COLIGN  the lines
         TRNOFE   windows
         TRNOMA   masks
         TRAPGE   general plot
         TRPOLE   graphics menu
            ZOOMPL    ZOOMNO              zooms  
            TRPOPO                        point position
            SOFOPE    TRAPGE   SOFFIN     soft-copy 
            HARDCP                        hard-copy
</PRE>
<P>
<P>
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