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5.3 Utilization of VIS3XX

Preprocessor VIS3XX is used to call the plot module. It corresponds to module VIS3D which can also be called by writing a main program with the following form:

           COMMON M(20 000)
           LM=20 000
           CALL INITIS(M,LM,0,0)
           CALL VIS3D(M,LM,F)
           STOP
           END

If the user wants to use an external function, F, it is necessary to include the following statement in the above program:

           EXTERNAL F

and add the functional description to the main program:

           FUNCTION F(X,Y)
           ---
           ---   description of the function
           ---
           RETURN
           END

Naturally, the above program must be linked with the library(ies) required for execution.

Before seeing how the above program runs, we first give a short overview of the dialogue obtained when executing the program. We have:

• the initialization of VIS3D, with the choice:
  • of command source (keyboard, file)
  • save of input data
  • of graphics terminal type

• the definition of the function, with:
  • the choice of the utilization type: finite element results, array T(NX,NY), external function, function typed on keyboard.

  • the commands available at this level: BORNES-XY, MAILLE-XY, GRAD-ECH-XYZ and (return).

An initial state (one or several values), which can be modified, is proposed for each choice.

The return key is used to exit from the subroutine (or commands level) in progress.

The next section gives the details regarding the possibilities offered in each of the cases mentioned above. Note that a call via VIS3XX results in the same operations, except for a few details (at the beginning).