This library generates QR Code symbols, and its design is optimized for speed. It contrasts with another QR library by the same author which is slow but which optimizes for clarity and conciseness. The functionality of this library and its API are nearly identical to the slow library, but it runs anywhere from 1.5× to 6× as fast.
*Home page for the fast library (design explanation, benchmarks): https://www.nayuki.io/page/fast-qr-code-generator-library
*Home page for the slow library (live demo, QR Code introduction, competitor comparisons): https://www.nayuki.io/page/qr-code-generator-library
* *Core features:
*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
Encodes numeric and special-alphanumeric text in less space than general text
Encodes Japanese Unicode text in kanji mode to save a lot of space compared to UTF-8 bytes
Computes optimal segment mode switching for text with mixed numeric/alphanumeric/general/kanji parts
Detects finder-like penalty patterns more accurately than other implementations
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
More information about QR Code technology and this library's design can be found on the project home page.
* *Simple operation:
*import java.awt.image.BufferedImage;
*import java.io.File;
*import javax.imageio.ImageIO;
*import io.nayuki.fastqrcodegen.*;
*
*QrCode qr = QrCode.encodeText("Hello, world!", QrCode.Ecc.MEDIUM);
*BufferedImage img = toImage(qr, 4, 10); // See QrCodeGeneratorDemo
*ImageIO.write(img, "png", new File("qr-code.png"));
* Manual operation:
*import java.util.List;
*import io.nayuki.fastqrcodegen.*;
*
*List<QrSegment> segs = QrSegment.makeSegments("3141592653589793238462643383");
*QrCode qr = QrCode.encodeSegments(segs, QrCode.Ecc.HIGH, 5, 5, 2, false);
*for (int y = 0; y < qr.size; y++) {
* for (int x = 0; x < qr.size; x++) {
* (... paint qr.getModule(x, y) ...)
* }
*}
*/
package io.nayuki.fastqrcodegen;