Is it possible to run a windowed application on Linux without running a screen manager and an X server?

Question

linux

Is it possible to implement the following:
After booting the Raspberry Pi in multi-user console mode (without starting X and display manager)
, you need to launch an application from this console (bash script, python script, or just a binary, it doesn’t matter), which will display the entire The screen is an image of a traffic light, in which the colors will change depending on what data the application receives over the network.
Is it possible to run such a graphical application without starting Xserver ?
Maybe you can see a code example somewhere, ideally a short Howto ?
Drawing an analogy with Windows XP, it seems to me that this is equivalent to launching a windowed application in Windows without starting explorer.exe.

Answer 1

Framebuffer to help you.
welinux.ru/post/1120
welinux.ru/post/1209

Answer 2

Drawing an analogy with Windows XP, it seems to me that this is equivalent to launching a windowed application in Windows without starting explorer.exe

there is not even a close analogy here.
Xserver is not a user shell, it is a graphics subsystem whose task is to "draw pictures"
Naturally, nothing will work without it, except to draw a traffic light in text mode

Answer 3

You can run it in the context of a virtual framebuffer using xvfb-run :
https://en.wikipedia.org/wiki/Xvfb
Accordingly, by running the application in this way, the rendering will be "virtual" and will not display anywhere.

Answer 4

do not want to start X? Finally write yours.
And in general Xs without an environment eat up 5 meters of oz. (I saw some Linux that with a graph environment ate 16 MB of RAM)

Answer 5

Apparently without the X server, it will not work in any way.
Here is what at least approximately meets the requirements.
askubuntu.com/questions/310671/start-ubuntu-withou...

Answer 6

1. Change colors for events in the bash
   
2. Rendering ASCII graphics