/* * Fast QR Code generator demo * * Run this command-line program with no arguments. The program creates/overwrites a bunch of * PNG and SVG files in the current working directory to demonstrate the creation of QR Codes. * * Copyright (c) Project Nayuki. (MIT License) * https://www.nayuki.io/page/fast-qr-code-generator-library * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * - The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * - The Software is provided "as is", without warranty of any kind, express or * implied, including but not limited to the warranties of merchantability, * fitness for a particular purpose and noninfringement. In no event shall the * authors or copyright holders be liable for any claim, damages or other * liability, whether in an action of contract, tort or otherwise, arising from, * out of or in connection with the Software or the use or other dealings in the * Software. */ package io.nayuki.fastqrcodegen; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.util.Arrays; import java.util.List; import java.util.Objects; import javax.imageio.ImageIO; public final class QrCodeGeneratorDemo { // The main application program. public static void main(String[] args) throws IOException { doBasicDemo(); doVarietyDemo(); doSegmentDemo(); doMaskDemo(); } /*---- Demo suite ----*/ // Creates a single QR Code, then writes it to a PNG file and an SVG file. private static void doBasicDemo() throws IOException { String text = "Hello, world!"; // User-supplied Unicode text QrCode.Ecc errCorLvl = QrCode.Ecc.LOW; // Error correction level QrCode qr = QrCode.encodeText(text, errCorLvl); // Make the QR Code symbol BufferedImage img = toImage(qr, 10, 4); // Convert to bitmap image File imgFile = new File("hello-world-QR.png"); // File path for output ImageIO.write(img, "png", imgFile); // Write image to file String svg = toSvgString(qr, 4, "#FFFFFF", "#000000"); // Convert to SVG XML code File svgFile = new File("hello-world-QR.svg"); // File path for output Files.write(svgFile.toPath(), // Write image to file svg.getBytes(StandardCharsets.UTF_8)); } // Creates a variety of QR Codes that exercise different features of the library, and writes each one to file. private static void doVarietyDemo() throws IOException { QrCode qr; // Numeric mode encoding (3.33 bits per digit) qr = QrCode.encodeText("314159265358979323846264338327950288419716939937510", QrCode.Ecc.MEDIUM); writePng(toImage(qr, 13, 1), "pi-digits-QR.png"); // Alphanumeric mode encoding (5.5 bits per character) qr = QrCode.encodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", QrCode.Ecc.HIGH); writePng(toImage(qr, 10, 2), "alphanumeric-QR.png"); // Unicode text as UTF-8 qr = QrCode.encodeText("こんにちwa、世界！ αβγδ", QrCode.Ecc.QUARTILE); writePng(toImage(qr, 10, 3), "unicode-QR.png"); // Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland) qr = QrCode.encodeText( "Alice was beginning to get very tired of sitting by her sister on the bank, " + "and of having nothing to do: once or twice she had peeped into the book her sister was reading, " + "but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice " + "'without pictures or conversations?' So she was considering in her own mind (as well as she could, " + "for the hot day made her feel very sleepy and stupid), whether the pleasure of making a " + "daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly " + "a White Rabbit with pink eyes ran close by her.", QrCode.Ecc.HIGH); writePng(toImage(qr, 6, 10), "alice-wonderland-QR.png"); } // Creates QR Codes with manually specified segments for better compactness. private static void doSegmentDemo() throws IOException { QrCode qr; List segs; // Illustration "silver" String silver0 = "THE SQUARE ROOT OF 2 IS 1."; String silver1 = "41421356237309504880168872420969807856967187537694807317667973799"; qr = QrCode.encodeText(silver0 + silver1, QrCode.Ecc.LOW); writePng(toImage(qr, 10, 3), "sqrt2-monolithic-QR.png"); segs = Arrays.asList( QrSegment.makeAlphanumeric(silver0), QrSegment.makeNumeric(silver1)); qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW); writePng(toImage(qr, 10, 3), "sqrt2-segmented-QR.png"); // Illustration "golden" String golden0 = "Golden ratio φ = 1."; String golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374"; String golden2 = "......"; qr = QrCode.encodeText(golden0 + golden1 + golden2, QrCode.Ecc.LOW); writePng(toImage(qr, 8, 5), "phi-monolithic-QR.png"); segs = Arrays.asList( QrSegment.makeBytes(golden0.getBytes(StandardCharsets.UTF_8)), QrSegment.makeNumeric(golden1), QrSegment.makeAlphanumeric(golden2)); qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW); writePng(toImage(qr, 8, 5), "phi-segmented-QR.png"); // Illustration "Madoka": kanji, kana, Cyrillic, full-width Latin, Greek characters String madoka = "「魔法少女まどか☆マギカ」って、　ИАИ　ｄｅｓｕ　κα？"; qr = QrCode.encodeText(madoka, QrCode.Ecc.LOW); writePng(toImage(qr, 9, 4, 0xFFFFE0, 0x303080), "madoka-utf8-QR.png"); segs = Arrays.asList(QrSegmentAdvanced.makeKanji(madoka)); qr = QrCode.encodeSegments(segs, QrCode.Ecc.LOW); writePng(toImage(qr, 9, 4, 0xE0F0FF, 0x404040), "madoka-kanji-QR.png"); } // Creates QR Codes with the same size and contents but different mask patterns. private static void doMaskDemo() throws IOException { QrCode qr; List segs; // Project Nayuki URL segs = QrSegment.makeSegments("https://www.nayuki.io/"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.HIGH, QrCode.MIN_VERSION, QrCode.MAX_VERSION, -1, true); // Automatic mask writePng(toImage(qr, 8, 6, 0xE0FFE0, 0x206020), "project-nayuki-automask-QR.png"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.HIGH, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 3, true); // Force mask 3 writePng(toImage(qr, 8, 6, 0xFFE0E0, 0x602020), "project-nayuki-mask3-QR.png"); // Chinese text as UTF-8 segs = QrSegment.makeSegments("維基百科（Wikipedia，聆聽i/ˌwɪkᵻˈpiːdi.ə/）是一個自由內容、公開編輯且多語言的網路百科全書協作計畫"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 0, true); // Force mask 0 writePng(toImage(qr, 10, 3), "unicode-mask0-QR.png"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 1, true); // Force mask 1 writePng(toImage(qr, 10, 3), "unicode-mask1-QR.png"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 5, true); // Force mask 5 writePng(toImage(qr, 10, 3), "unicode-mask5-QR.png"); qr = QrCode.encodeSegments(segs, QrCode.Ecc.MEDIUM, QrCode.MIN_VERSION, QrCode.MAX_VERSION, 7, true); // Force mask 7 writePng(toImage(qr, 10, 3), "unicode-mask7-QR.png"); } /*---- Utilities ----*/ private static BufferedImage toImage(QrCode qr, int scale, int border) { return toImage(qr, scale, border, 0xFFFFFF, 0x000000); } /** * Returns a raster image depicting the specified QR Code, with * the specified module scale, border modules, and module colors. *

For example, scale=10 and border=4 means to pad the QR Code with 4 light border * modules on all four sides, and use 10×10 pixels to represent each module. * @param qr the QR Code to render (not {@code null}) * @param scale the side length (measured in pixels, must be positive) of each module * @param border the number of border modules to add, which must be non-negative * @param lightColor the color to use for light modules, in 0xRRGGBB format * @param darkColor the color to use for dark modules, in 0xRRGGBB format * @return a new image representing the QR Code, with padding and scaling * @throws NullPointerException if the QR Code is {@code null} * @throws IllegalArgumentException if the scale or border is out of range, or if * {scale, border, size} cause the image dimensions to exceed Integer.MAX_VALUE */ private static BufferedImage toImage(QrCode qr, int scale, int border, int lightColor, int darkColor) { Objects.requireNonNull(qr); if (scale <= 0 || border < 0) throw new IllegalArgumentException("Value out of range"); if (border > Integer.MAX_VALUE / 2 || qr.size + border * 2L > Integer.MAX_VALUE / scale) throw new IllegalArgumentException("Scale or border too large"); BufferedImage result = new BufferedImage((qr.size + border * 2) * scale, (qr.size + border * 2) * scale, BufferedImage.TYPE_INT_RGB); for (int y = 0; y < result.getHeight(); y++) { for (int x = 0; x < result.getWidth(); x++) { boolean color = qr.getModule(x / scale - border, y / scale - border); result.setRGB(x, y, color ? darkColor : lightColor); } } return result; } // Helper function to reduce code duplication. private static void writePng(BufferedImage img, String filepath) throws IOException { ImageIO.write(img, "png", new File(filepath)); } /** * Returns a string of SVG code for an image depicting the specified QR Code, with the specified * number of border modules. The string always uses Unix newlines (\n), regardless of the platform. * @param qr the QR Code to render (not {@code null}) * @param border the number of border modules to add, which must be non-negative * @param lightColor the color to use for light modules, in any format supported by CSS, not {@code null} * @param darkColor the color to use for dark modules, in any format supported by CSS, not {@code null} * @return a string representing the QR Code as an SVG XML document * @throws NullPointerException if any object is {@code null} * @throws IllegalArgumentException if the border is negative */ private static String toSvgString(QrCode qr, int border, String lightColor, String darkColor) { Objects.requireNonNull(qr); Objects.requireNonNull(lightColor); Objects.requireNonNull(darkColor); if (border < 0) throw new IllegalArgumentException("Border must be non-negative"); long brd = border; StringBuilder sb = new StringBuilder() .append("\n") .append("\n") .append(String.format("\n", qr.size + brd * 2)) .append("\t\n") .append("\t\n") .append("\n") .toString(); } }