Tcl/Tk demo cleanup and bugs

[Daniel J S. <dan...@ie...>]

I've shaken the bugs out of the Tcl/Tk "demo demo" and updated the=20
patch.  The main problem was that the Tcl/Tk "open" was directing=20
gnuplot's output to stdout.  That caused the buffer to fill up, and then =

the program froze.  Another problem was that the fontfile.dem and=20
fontfile_latex.dem files would change the terminal to something other=20
than x11 and break in the middle before they could restore the terminal=20
via "pop".  Hence gnuplot terminal was stuck in "post" such that it=20
appears as though the program was hung because the x11 window would no=20
longer be drawn to... easy fix.

Inside the "reread.bor" file I changed

replot
reread

to

replot
pause -1 "Hit return to continue"
if (bb!=3D0) reread;

That way, the 'border.dem' demo behaves like all others in that it plots =

16 different border styles in response to a keyboard hit and then stops.

I added "borders.dem", "charset.dem" and "vector.dem" to "all.dem".

=3D=3D=3D=3D=3D=3D=3D=3D

Here is a bug in current CVS I added to SourceForge:  There is a demo 've=
ctor.dem' in the /demo subdirectory.  I seems to run fine.  However, it f=
ails after running the demo 'pm3dcolors.dem' and type 'reset' in between =
doesn't fix things.  The following error occurs.

splot vtot(x,y) w l
                            ^
         "vector.dem", line 60: `using` with 4 parameters but surface wit=
hout `pm3d` or `palette`

And I believe I can pinpoint this error, for someone else to fix.  Below =
is the section of code from plot3d.c causing the problem.  Notice that th=
e portion of code issuing the error follows the if/else statement.  One o=
f the variables in the conditional test is df_no_use_specs.  But df_no_us=
e_specs is a variable associated with datafile.c and is only set when df_=
open() is called.  Now look at the "splot" command above and notice that =
it is a function, not a data file.  Hence, the demo "pm3dcolors.dem" sets=
 the value of df_no_using_specs to 4.  Then when the vector.dem demo is r=
un, df_no_use_specs is 4, it is unaffected by reset and it never gets set=
 to something else because df_open() never gets called.  A quick solution=
 is to put "   df_no_use_specs =3D 0;" right after the /* function to plo=
t */ else bracket... or if someone knows how to determine the number of c=
olumns of data from the function, that is even better.



	    if (isstring(c_token)) {	/* data file to plot */
<snip>
		specs =3D df_open(MAXDATACOLS, MODE_SPLOT);
<snip>
	    } else {		/* function to plot */
<snip>
	    }			/* end of IS THIS A FILE OR A FUNC block */

<snip>

#ifdef PM3D
	    if (df_no_use_specs=3D=3D4 &&
		!(this_plot->lp_properties.use_palette ||
		  pm3d.where[0] || this_plot->pm3d_where[0] || this_plot->plot_style & =
PM3DSURFACE))
		int_error(c_token, "`using` with 4 parameters but surface without `pm3d=
` or `palette`");
#endif