Re: background color -- Re: Plot placement, revisited

[Ethan M. <merritt@u.washington.edu>]

On Monday 09 August 2004 11:01 pm, mi...@ph... wrote:
> I have tried to use it by overprinting a label with "textcolor lt -2" over
> a pm3d plot, but it never used the background (white) color --- I tried
> for postscript, png, x11. Do you have a successful example of the feature?

Yes, certainly.
This was the suggested work-around for filling the area between
two curves up through version 4.0.   It is obsolete now that the
filledcurves style supports filling between curves directly, but it
still works:

    set style func filledcurves y1=0
    plot sin(x)**2 lt 1, 0.5*sin(x)**2 lt -2

(works on at least x11, png and post;   png image attached)

As to text printing, I wasn't thinking in terms of writing text in
the background color. Let me try it ....

Ah, I see.   It explicitly does not let you do this:
set.c:
        if (tc->lt <= LT_NODRAW) {
            tc->type = TC_DEFAULT;
            int_warn(c_token,"illegal linetype");
        }

Well, that's easy enough to fix if you think it's a useful feature.
I guess if someone explicitly sets the text color to background
then they can live with the possibly invisible results.
Test output after changing <= to < in the above check is
also attached as a png image.

I will make this 1-line (actually 1-character) change in cvs.



-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195