ansi256 output (produced by gnuplot) is not correctly shown in textual, e.g. a Static widget.

[michaeltraxler]

Simple gnuplot produced ansi256 output is correctly shown in the Static widget.
When curves in gnuplot start to cross each other, errors in the display start to show up in textual, while everything is shown correctly in the terminal, e.g. kitty.

Here the expected display via 'cat gnuplot.ouput':

And this is what is shown in textual static:

More complex outputs are shown as this:

How to reproduce:

gnuplot script:

set term block ansi256  size 100,40;
plot [0:4] sin(x) with lines lc rgb "blue"   title 'DCM accepted trigger rate', sin(x-0.05) with lines lc rgb "red"    title 'DCM rejected triggers', sin(x-2) with lines lc rgb "orange" title 'DOGs rejected triggers';

Textual code:

from pathlib import Path
from textual.app import App, ComposeResult
from textual.widgets import Static
class FileViewer(App):
    def compose(self) -> ComposeResult:
        text = Path("text.txt").read_text(encoding="utf-8") if Path("text.txt").exists() else "text.txt not found"
        yield Static(text)

if __name__ == "__main__":
    FileViewer().run()

I tried it on different computers, in different terminal and also in tmux and so on. Everywhere the same issue.
Also with "ansi" and "ansirgb" instead of "ansi256" this issue happens.
Only if I remove the "ansi..." completely from the gnuplot, the resulting text is correctly shown in the Static widget.

The actual text.txt file with the gnuplot ansi256 output is attached for convenience.

text.txt

[github-actions[bot]]

We found the following entry in the FAQ which you may find helpful:

• How do I center a widget in a screen?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

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This is an automated reply, generated by FAQtory

[willmcgugan]

Textual widgets display plain text, not text with ANSI codes. You can convert text with ansi codes to a Text instance with Text.from_ansi. This may work, but not all ansi codes are supported.

There are much better options for displaying plots with Textual. See Textual Plot

[michaeltraxler]

Dear Will,
I am honestly so thankful to you! First for this absolutely fabulous software (I watched the TalkPython show with you) and additionally, that you take your time to answer to my question! Yes, with Text.from_ansi (from rich.text) it now works great.
The reason for gnuplot: It is sooo fast. I use this to display our rates of a DAQ system for nuclear/particle-physics experiments with a refresh rate of 60Hz and sometimes even 100 Hz. With Rich/Textual this works over ssh. I can not tell you how happy I am! Thanks again!

[willmcgugan]

Thanks, Michael! Sounds like a really interesting project you are working on.