History

Project Nayuki 764749bd8a Added spaces around multiplication operators in QrCode.getAlignmentPatternPositions() for all language versions, for consistency with other code.		3 years ago
..
examples	Removed the test worker program in every language and the Python batch tester, because this is not core functionality and is hard to explain.	3 years ago
src	Added spaces around multiplication operators in QrCode.getAlignmentPatternPositions() for all language versions, for consistency with other code.	3 years ago
Cargo.toml	Updated package version numbers.	5 years ago
Readme.markdown	In Rust version: moved QrCode.to_svg_string() out of the library and into the runnable demo program, slightly adapted some code, updated documentation comments.	3 years ago

Readme.markdown

QR Code generator library

Introduction

This project aims to be the best, clearest QR Code generator library. The primary goals are flexible options and absolute correctness. Secondary goals are compact implementation size and good documentation comments.

Home page with live JavaScript demo, extensive descriptions, and competitor comparisons: https://www.nayuki.io/page/qr-code-generator-library

Features

Core features:

Available in 6 programming languages, all with nearly equal functionality: Java, TypeScript/JavaScript, Python, Rust, C++, C
Significantly shorter code but more documentation comments compared to competing libraries
Supports encoding all 40 versions (sizes) and all 4 error correction levels, as per the QR Code Model 2 standard
Output format: Raw modules/pixels of the QR symbol
Detects finder-like penalty patterns more accurately than other implementations
Encodes numeric and special-alphanumeric text in less space than general text
Open source code under the permissive MIT License

Manual parameters:

User can specify minimum and maximum version numbers allowed, then library will automatically choose smallest version in the range that fits the data
User can specify mask pattern manually, otherwise library will automatically evaluate all 8 masks and select the optimal one
User can specify absolute error correction level, or allow the library to boost it if it doesn't increase the version number
User can create a list of data segments manually and add ECI segments

Examples

extern crate qrcodegen;
use qrcodegen::QrCode;
use qrcodegen::QrCodeEcc;
use qrcodegen::QrSegment;

// Simple operation
let qr = QrCode::encode_text("Hello, world!",
    QrCodeEcc::Medium).unwrap();
let svg = to_svg_string(&qr, 4);  // See qrcodegen-demo

// Manual operation
let chrs: Vec<char> = "3141592653589793238462643383".chars().collect();
let segs = QrSegment::make_segments(&chrs);
let qr = QrCode::encode_segments_advanced(
    &segs, QrCodeEcc::High, 5, 5, Some(Mask::new(2)), false).unwrap();
for y in 0 .. qr.size() {
    for x in 0 .. qr.size() {
        (... paint qr.get_module(x, y) ...)
    }
}

More complete set of examples: https://github.com/nayuki/QR-Code-generator/blob/master/rust/examples/qrcodegen-demo.rs .