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    REFERENCE EDGES    : 8
</PRE>
<DT>Key 80:
<DD> the line type: SOLID (by default) or, by activating this key, the choice between:
<PRE>    SOLID      : 1  --   DOTTED    : 2
    DASHED     : 3  --   MIXED     : 4 ?
</PRE>
<P>
 </DL>
<P>
Once a plot has been displayed on screen, a graphics menu appears which allows us  to:
<P>
<UL><LI> Exit (0) from the session;
<LI> Continue (1), i.e., return to the module's main menu;
<LI> Display the next (2) or previous (3) plot;
<LI> Refresh (4) the screen;
<LI> Zoom (5 or M) (designate the zoom zone by clicking, or designate manually), or a zoom -
 (6);
<LI> Move (7) a vertex (action described below);
<LI> Produce a hardcopy (9) of the screen, or a softcopy (8) on another graphical terminal; having done this,
the user is returned to the initial state (of this <i> graphics</i> menu).
</UL>
<P>
Moving points, possible in dimension 2, enables us to modify the mesh by displacing certain vertices
<FONT color="#B8860B" SIZE=-1><I>(<IMG ALIGN=middle SRC="../icons/foot_motif.gif"
	ALT="[note]"> Only the internal vertices are modifiable, in particular, the non-vertex nodes are not acceptable
 for a P2 mesh.)</I></FONT>. Place the cursor in the neighborhood of the (internal) point to move and type 7,. The
point selected is highlighted (a small star appears near the point). Move the cursor to the desired position
and validate it by typing 7. The point moves and the corresponding elements are reformed (on some
terminals, the screen needs to be refreshed).
<P>
The validity of the repositioning of the points is checked. It is clear that we cannot move a point in an arbitrary
fashion; the program checks automatically that the mesh remains correct by calculating the surfaces of
the modified elements to ensure that they remain positive.
<P>
If the point only belongs to triangles, it suffices to consider their surfaces. If the point belongs to one
or several quadrilaterals, the check consists of examining the surfaces of the triangles which could be
formed from the 4 vertices of each modified quadrilateral.
<P>
<P><A NAME=1563>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img40.gif">
<BR><STRONG>Figure 2.1:</STRONG> <i> Checking the displacement of a point</i><A NAME=1559iCheckingthedisplacementofapointi1559>&#160;</A><BR>
<P>
<P>
At each modification, the coordinates of the initial and final point positions are displayed.
Thus, the move option can be used craftily to establish a vertex position.
Place the cursor close to the desired point, validate by typing 7 and then move the point to an
obviously impossible position (and validate by 7): the displacement is refused and the position
of the desired point is displayed!
<P>
<P>
<P>
<DL COMPACT><DT>Mesh and deformation:
<DD>  
<P>
The module (see limits of utilization) enables us to visualize a mesh and its deformed state. The deformed
mesh is obtained by adding (with an amplification factor) the displacements to the nodal coordinates.
<P>
For those cases possible, selecting key 10 results in the following general menu:
<P>
<PRE> ---------------------------------------------------------------
 | 10 | PLOT TYPE                 |         MESH AND DEFORMATION
 ---------------------------------------------------------------
 ...
 ---------------------------------------------------------------
 | 20 | MESH TO PLOT              |         carre.nopo
 ---------------------------------------------------------------
 | 21 | S.D. B USED               |         carre.b
 ---------------------------------------------------------------
 | 22 | DEFORMATION RATIO         |            100.0000
 ---------------------------------------------------------------
 | 24 | LOAD CASE                 |              1
 ---------------------------------------------------------------
 ...
 ---------------------------------------------------------------
 | 50 | ITEMS TO BE PLOTTED       |         MESH
 ---------------------------------------------------------------
 | 50 | ITEMS PLOTTED (DEFORM)    |         NO MESH
 ---------------------------------------------------------------
 ...
 ---------------------------------------------------------------
 | 80 | LINE TYPE                 |         SOLID
 ---------------------------------------------------------------
</PRE>
<P>
A key (number) and a status corresponds to each item (see, in particular, the new keys marked with
an asterisk). To modify the status, type the key and enter (see general introduction)
the values corresponding to the desired status.
<P>
<DL COMPACT><DT>Key 10:
<DD> The plot type: mesh and its deformation; we can also visualize the
mesh only by typing 10.
<DT>Key 21 *:
<DD> The name of the file containing the displacements. To change the file, activate
this key and enter the desired file name.
<DT>Key 22 *:
<DD> Amplification ration for the displacements (100. by default). By activating this key, we
can modify this value.
<DT>Key 24 *:
<DD> The load case to be considered (by default 1, this value must lie between 1 and NDSM,
the total number of load cases contained in D.S. <b> B</b>).
<DT>Key 50:
<DD> The items to plot, for the initial mesh as well as for the deformed configuration.
The choice is the same as for the standard case (see key 50 above): we can plot the contour
(choice 2) of the initial mesh and the elements of its deformation (choice 1).
<DT>Key 80:
<DD> The line type of the plot, for the initial mesh as well as for the deformed configuration.
The choices are identical to the standard case.
<P>
 </DL>
<P>
Once the plot is displayed on the screen, the <i> graphics</i> menu described above is at our disposal (except the
move option).
<P>
<P>
<P>
<DT>Examples:
<DD> Some examples of plots of two-dimensional meshes obtained via <b> TRNOXX</b> are given
in figures <A HREF="#figtrnopo1">2.2</A> to <A HREF="#figtrnopo4">2.5</A>. Note that the graphics menu is not displayed as
the figures correspond to a softcopy done on a laser printer,
and as such a terminal does not have any input possibilities.
<P>
<P>
<P>
The plots were obtained by typing the following sequence:
<P>
<UL><LI> figure <A HREF="#figtrnopo1">2.2</A>: -1 naca.nopo 0 8 2 bw ncadre nlogo x12 y12 fnaca v
<LI> figure <A HREF="#figtrnopo2">2.3</A>: -1 f5508.nopo 0 8 2 bw ncadre nlogo x12 y12 froue v
<LI> figure <A HREF="#figtrnopo3">2.4</A>: (starting with the above) 5 5 1 70 5 0 0 8 2
bw ncadre nlogo x12 y12 froue1 v
<LI> figure <A HREF="#figtrnopo4">2.5</A>: -1 cooler.nopo 60 0 8 2 bw ncadre nlogo x12 y12 fcooler v
</UL> 
 </DL>
<P>
<P><A NAME=1575>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img41.gif">
<BR><STRONG>Figure 2.2:</STRONG> <i> Example <b> TRNOXX</b> 2D: automatic mode</i><A NAME=1573iExample1569bTRNOXXb15692Dautomaticmodei1573>&#160;</A><BR>
<P>
<P>
<P><A NAME=1588>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img42.gif">
<BR><STRONG>Figure 2.3:</STRONG> <i> Example <b> TRNOXX</b> 2D: automatic mode</i><A NAME=1586iExample1582bTRNOXXb15822Dautomaticmodei1586>&#160;</A><BR>
<P>
<P>
<P><A NAME=1601>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img43.gif">
<BR><STRONG>Figure 2.4:</STRONG> <i> Example <b> TRNOXX</b> 2D: zoom, shrink and reference numbers</i><A NAME=1599iExample1595bTRNOXXb15952Dzoomshrinkandreferencenumbersi1599>&#160;</A><BR>
<P>
<P>
<P><A NAME=1614>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img44.gif">
<BR><STRONG>Figure 2.5:</STRONG> <i> Example <b> TRNOXX</b> 2D: automatic mode without legend</i><A NAME=1612iExample1608bTRNOXXb16082Dautomaticmodewithoutlegendi1612>&#160;</A><BR>
<P>
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