Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 iText Group NV * Authors: Bruno Lowagie, Paulo Soares, et al. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT * OF THIRD PARTY RIGHTS * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Affero General Public License for more details. * You should have received a copy of the GNU Affero General Public License * along with this program; if not, see http://www.gnu.org/licenses or write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA, 02110-1301 USA, or download the license from the following URL: * http://itextpdf.com/terms-of-use/ * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * In accordance with Section 7(b) of the GNU Affero General Public License, * a covered work must retain the producer line in every PDF that is created * or manipulated using iText. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the iText software without * disclosing the source code of your own applications. * These activities include: offering paid services to customers as an ASP, * serving PDFs on the fly in a web application, shipping iText with a closed * source product. * * For more information, please contact iText Software Corp. at this * address: sales@itextpdf.com */ package com.itextpdf.text.pdf; import com.itextpdf.text.*; import com.itextpdf.text.pdf.qrcode.EncodeHintType; import com.itextpdf.text.pdf.qrcode.WriterException; import com.itextpdf.text.pdf.qrcode.ByteMatrix; import com.itextpdf.text.pdf.qrcode.QRCodeWriter; import com.itextpdf.text.pdf.codec.CCITTG4Encoder; import java.util.Map; /** * A QRCode implementation based on the zxing code. * @author Paulo Soares * @since 5.0.2 */ public class BarcodeQRCode { ByteMatrix bm; /** * Creates the QR barcode. The barcode is always created with the smallest possible size and is then stretched * to the width and height given. Set the width and height to 1 to get an unscaled barcode. * @param content the text to be encoded * @param width the barcode width * @param height the barcode height * @param hints modifiers to change the way the barcode is create. They can be EncodeHintType.ERROR_CORRECTION * and EncodeHintType.CHARACTER_SET. For EncodeHintType.ERROR_CORRECTION the values can be ErrorCorrectionLevel.L, M, Q, H. * For EncodeHintType.CHARACTER_SET the values are strings and can be Cp437, Shift_JIS and ISO-8859-1 to ISO-8859-16. * You can also use UTF-8, but correct behaviour is not guaranteed as Unicode is not supported in QRCodes. * The default value is ISO-8859-1. * @throws WriterException */ public BarcodeQRCode(String content, int width, int height, Map<EncodeHintType, Object> hints) { try { QRCodeWriter qc = new QRCodeWriter(); bm = qc.encode(content, width, height, hints); } catch (WriterException ex) { throw new ExceptionConverter(ex); } } private byte[] getBitMatrix() { int width = bm.getWidth(); int height = bm.getHeight(); int stride = (width + 7) / 8; byte[] b = new byte[stride * height]; byte[][] mt = bm.getArray(); for (int y = 0; y < height; ++y) { byte[] line = mt[y]; for (int x = 0; x < width; ++x) { if (line[x] != 0) { int offset = stride * y + x / 8; b[offset] |= (byte) (0x80 >> (x % 8)); } } } return b; } /** Gets an <CODE>Image</CODE> with the barcode. * @return the barcode <CODE>Image</CODE> * @throws BadElementException on error */ public Image getImage() throws BadElementException { byte[] b = getBitMatrix(); byte g4[] = CCITTG4Encoder.compress(b, bm.getWidth(), bm.getHeight()); return Image.getInstance(bm.getWidth(), bm.getHeight(), false, Image.CCITTG4, Image.CCITT_BLACKIS1, g4, null); } // AWT related methods (remove this if you port to Android / GAE) /** Creates a <CODE>java.awt.Image</CODE>. * @param foreground the color of the bars * @param background the color of the background * @return the image */ public java.awt.Image createAwtImage(java.awt.Color foreground, java.awt.Color background) { int f = foreground.getRGB(); int g = background.getRGB(); java.awt.Canvas canvas = new java.awt.Canvas(); int width = bm.getWidth(); int height = bm.getHeight(); int pix[] = new int[width * height]; byte[][] mt = bm.getArray(); for (int y = 0; y < height; ++y) { byte[] line = mt[y]; for (int x = 0; x < width; ++x) { pix[y * width + x] = line[x] == 0 ? f : g; } } java.awt.Image img = canvas.createImage(new java.awt.image.MemoryImageSource(width, height, pix, 0, width)); return img; } public void placeBarcode(PdfContentByte cb, BaseColor foreground, float moduleSide) { int width = bm.getWidth(); int height = bm.getHeight(); byte[][] mt = bm.getArray(); cb.setColorFill(foreground); for (int y = 0; y < height; ++y) { byte[] line = mt[y]; for (int x = 0; x < width; ++x) { if (line[x] == 0) { cb.rectangle(x * moduleSide, (height - y - 1) * moduleSide, moduleSide, moduleSide); } } } cb.fill(); } /** Gets the size of the barcode grid. */ public Rectangle getBarcodeSize() { return new Rectangle(0, 0, bm.getWidth(), bm.getHeight()); } }