blob: b8d2ae1ccf60b1dd3e44773fbc91ef298b4278a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
#+author: Benjamin Chausse <benjamin@chausse.xyz>
#+HTML: <div align="center">
* VimLogo - ANSI
#+HTML: </div>
This is a small terminal program that prints the Vim logo in using ANSI escape codes.
It utilizes the fact that terminal fonts have a heightxwith ratio of 2x1 combined with
the ~▀~ character that covers the top half of a character.
Since terminals can set a different foreground and background color for each character,
we can essentially draw 2 vertically stacked pixels per character.
This is where ANSI escape codes come in. If your terminal supports 24-bit colors, you can
set foregrounds and background to any rgb value:
- ~\033[38;2;22;33;44m~ sets the foreground color to rgb(22, 33, 44)
- ~\033[48;2;44;55;66m~ sets the background color to rgb(44, 55, 66)
[[https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797#file-ansi-md][This github gist]] was an invaluable resource for gaining a deeper
understanding of ANSI escape codes and how to use them to draw graphics in
the terminal. I highly recommend checking it out if you're interested in
learning more about this topic.
** So why the Vim logo?
Well, the idea to do this came to me as I was browsing the vim subreddit
(as one does) and saw [[][this post]] by ~u/fapperruning~ where he drew
the vim logo with pixel art. The size was small enough it could nicely fit
in a terminal window, though big enough it waas no feasible to draw by hand.
So using this as a starting point, I searched for a way to firstly parse the image
and found [[https://www.piskelapp.com/p/create/sprite][Piskel]]. The amazing thing about Piskel is that it allows you to export
a sprite as a big integer array written in C. The first thing I did was to
downscale ~u/fapperruning~'s image so that 1 pixel = 1 square in the sprite.
I the slightly modified Piskel's C file output so that it corresponds to a Go slice
of 32-bit unsigned integers.
So if you want, this code really doesn't have to be about the Vim logo. Just give it
any slice of 32-bit integers (as well as the width and height of the image) and it will
spit it out on your glorious terminal.
*Note*: Your terminal must be able to display [[https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797#rgb-colors][true colors]] if you want to try/use this.
** How to build
First, you must have Go installed (duh)...
Once that's done, just clone the repo, ~cd~ into it and run:
#+begin_src sh
go build -o vimlogo-ansi *.go
#+end_src
|
