Hey everyone,

I've been working on a small project lately and thought I'd share it with you all. It's a simple QR code generation library. It is based on Project Nayuki's library.

The main idea behind it was to create something that doesn't rely on any external dependencies. I know how annoying it can be when you want to do something simple like generating a QR code, and you end up having to install a bunch of packages. So, this library is completely self-contained.

Some key points about it:

• No external dependencies, as mentioned.
• You can tweak various generation parameters to get the QR code just how you want it.
• It supports exporting to different formats: SVG, PNG, and PPM.

If you need something straightforward, this might be useful.

dub add qr

import qr;
import std.stdio;

void main()
{
   // ASCII art FTW
   QrCode("Hello D!").writeln();

   // Save as PNG. Look, Ma, no external deps!
   QrCode("Hello D!").save("simple-qr.png");
}

The code and docs are up on GitHub https://github.com/trikko/qr

Feel free to check it out, use it if you find it helpful, and let me know if you run into any issues or have suggestions for improvements.
Cheers!

Andrea Fontana

On Wednesday, 16 October 2024 at 12:58:29 UTC, Andrea Fontana wrote:

After watching the recent video of Veritasium, I was planning to write one. Yours seems great. It is al so a good example when you write things half in C and half in D with importC.

https://www.youtube.com/watch?v=w5ebcowAJD8

On Wednesday, 16 October 2024 at 12:58:29 UTC, Andrea Fontana wrote:

import qr;
import std.stdio;

void main()
{
   // ASCII art FTW
   QrCode("Hello D!").writeln();

   // Save as PNG. Look, Ma, no external deps!
   QrCode("Hello D!").save("simple-qr.png");
}

I haven't tried it yet, but it's an excellent example of high-quality work, especially with the use of D's standard library and importC. Please accept my congratulations on your contribution. I have a small question:

Is it possible to increase or decrease the image file resolution?

SDB@79

On Wednesday, 16 October 2024 at 12:58:29 UTC, Andrea Fontana wrote:

Wow .. the png code is beautiful!

Kind regards,
Christian

On Thursday, 17 October 2024 at 17:40:30 UTC, Christian Köstlin wrote:

Minimal!

Andrea

On Wednesday, 16 October 2024 at 12:58:29 UTC, Andrea Fontana wrote:

I have released a small update with some improvements:

• Added SVGZ format (still with no external dependencies!)
• PNG files now use an indexed color palette and maximum compression
• Deprecated save() in favor of saveAs()

Now, a QRCode sized 2500x2500px (!) takes ~3.5KB as a PNG or ~750 bytes as an SVGZ.

Andrea Fontana