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.error_messages.MessageLocalization; import com.itextpdf.text.Element; import com.itextpdf.text.ExceptionConverter; import com.itextpdf.text.Rectangle; import com.itextpdf.text.BaseColor; /** Implements the code interleaved 2 of 5. The text can include * non numeric characters that are printed but do not generate bars. * The default parameters are: * <pre> *x = 0.8f; *n = 2; *font = BaseFont.createFont("Helvetica", "winansi", false); *size = 8; *baseline = size; *barHeight = size * 3; *textAlignment = Element.ALIGN_CENTER; *generateChecksum = false; *checksumText = false; * </pre> * * @author Paulo Soares */ public class BarcodeInter25 extends Barcode { /** The bars to generate the code. */ private static final byte BARS[][] = { { 0, 0, 1, 1, 0 }, { 1, 0, 0, 0, 1 }, { 0, 1, 0, 0, 1 }, { 1, 1, 0, 0, 0 }, { 0, 0, 1, 0, 1 }, { 1, 0, 1, 0, 0 }, { 0, 1, 1, 0, 0 }, { 0, 0, 0, 1, 1 }, { 1, 0, 0, 1, 0 }, { 0, 1, 0, 1, 0 } }; /** Creates new BarcodeInter25 */ public BarcodeInter25() { try { x = 0.8f; n = 2; font = BaseFont.createFont("Helvetica", "winansi", false); size = 8; baseline = size; barHeight = size * 3; textAlignment = Element.ALIGN_CENTER; generateChecksum = false; checksumText = false; } catch (Exception e) { throw new ExceptionConverter(e); } } /** Deletes all the non numeric characters from <CODE>text</CODE>. * @param text the text * @return a <CODE>String</CODE> with only numeric characters */ public static String keepNumbers(String text) { StringBuffer sb = new StringBuffer(); for (int k = 0; k < text.length(); ++k) { char c = text.charAt(k); if (c >= '0' && c <= '9') sb.append(c); } return sb.toString(); } /** Calculates the checksum. * @param text the numeric text * @return the checksum */ public static char getChecksum(String text) { int mul = 3; int total = 0; for (int k = text.length() - 1; k >= 0; --k) { int n = text.charAt(k) - '0'; total += mul * n; mul ^= 2; } return (char) (((10 - (total % 10)) % 10) + '0'); } /** Creates the bars for the barcode. * @param text the text. It can contain non numeric characters * @return the barcode */ public static byte[] getBarsInter25(String text) { text = keepNumbers(text); if ((text.length() & 1) != 0) throw new IllegalArgumentException( MessageLocalization.getComposedMessage("the.text.length.must.be.even")); byte bars[] = new byte[text.length() * 5 + 7]; int pb = 0; bars[pb++] = 0; bars[pb++] = 0; bars[pb++] = 0; bars[pb++] = 0; int len = text.length() / 2; for (int k = 0; k < len; ++k) { int c1 = text.charAt(k * 2) - '0'; int c2 = text.charAt(k * 2 + 1) - '0'; byte b1[] = BARS[c1]; byte b2[] = BARS[c2]; for (int j = 0; j < 5; ++j) { bars[pb++] = b1[j]; bars[pb++] = b2[j]; } } bars[pb++] = 1; bars[pb++] = 0; bars[pb++] = 0; return bars; } /** Gets the maximum area that the barcode and the text, if * any, will occupy. The lower left corner is always (0, 0). * @return the size the barcode occupies. */ public Rectangle getBarcodeSize() { float fontX = 0; float fontY = 0; if (font != null) { if (baseline > 0) fontY = baseline - font.getFontDescriptor(BaseFont.DESCENT, size); else fontY = -baseline + size; String fullCode = code; if (generateChecksum && checksumText) fullCode += getChecksum(fullCode); fontX = font.getWidthPoint(altText != null ? altText : fullCode, size); } String fullCode = keepNumbers(code); int len = fullCode.length(); if (generateChecksum) ++len; float fullWidth = len * (3 * x + 2 * x * n) + (6 + n) * x; fullWidth = Math.max(fullWidth, fontX); float fullHeight = barHeight + fontY; return new Rectangle(fullWidth, fullHeight); } /** Places the barcode in a <CODE>PdfContentByte</CODE>. The * barcode is always placed at coordinates (0, 0). Use the * translation matrix to move it elsewhere.<p> * The bars and text are written in the following colors:<p> * <P><TABLE BORDER=1> * <TR> * <TH><P><CODE>barColor</CODE></TH> * <TH><P><CODE>textColor</CODE></TH> * <TH><P>Result</TH> * </TR> * <TR> * <TD><P><CODE>null</CODE></TD> * <TD><P><CODE>null</CODE></TD> * <TD><P>bars and text painted with current fill color</TD> * </TR> * <TR> * <TD><P><CODE>barColor</CODE></TD> * <TD><P><CODE>null</CODE></TD> * <TD><P>bars and text painted with <CODE>barColor</CODE></TD> * </TR> * <TR> * <TD><P><CODE>null</CODE></TD> * <TD><P><CODE>textColor</CODE></TD> * <TD><P>bars painted with current color<br>text painted with <CODE>textColor</CODE></TD> * </TR> * <TR> * <TD><P><CODE>barColor</CODE></TD> * <TD><P><CODE>textColor</CODE></TD> * <TD><P>bars painted with <CODE>barColor</CODE><br>text painted with <CODE>textColor</CODE></TD> * </TR> * </TABLE> * @param cb the <CODE>PdfContentByte</CODE> where the barcode will be placed * @param barColor the color of the bars. It can be <CODE>null</CODE> * @param textColor the color of the text. It can be <CODE>null</CODE> * @return the dimensions the barcode occupies */ public Rectangle placeBarcode(PdfContentByte cb, BaseColor barColor, BaseColor textColor) { String fullCode = code; float fontX = 0; if (font != null) { if (generateChecksum && checksumText) fullCode += getChecksum(fullCode); fontX = font.getWidthPoint(fullCode = altText != null ? altText : fullCode, size); } String bCode = keepNumbers(code); if (generateChecksum) bCode += getChecksum(bCode); int len = bCode.length(); float fullWidth = len * (3 * x + 2 * x * n) + (6 + n) * x; float barStartX = 0; float textStartX = 0; switch (textAlignment) { case Element.ALIGN_LEFT: break; case Element.ALIGN_RIGHT: if (fontX > fullWidth) barStartX = fontX - fullWidth; else textStartX = fullWidth - fontX; break; default: if (fontX > fullWidth) barStartX = (fontX - fullWidth) / 2; else textStartX = (fullWidth - fontX) / 2; break; } float barStartY = 0; float textStartY = 0; if (font != null) { if (baseline <= 0) textStartY = barHeight - baseline; else { textStartY = -font.getFontDescriptor(BaseFont.DESCENT, size); barStartY = textStartY + baseline; } } byte bars[] = getBarsInter25(bCode); boolean print = true; if (barColor != null) cb.setColorFill(barColor); for (int k = 0; k < bars.length; ++k) { float w = (bars[k] == 0 ? x : x * n); if (print) cb.rectangle(barStartX, barStartY, w - inkSpreading, barHeight); print = !print; barStartX += w; } cb.fill(); if (font != null) { if (textColor != null) cb.setColorFill(textColor); cb.beginText(); cb.setFontAndSize(font, size); cb.setTextMatrix(textStartX, textStartY); cb.showText(fullCode); cb.endText(); } return getBarcodeSize(); } // AWT related methods (remove this if you port to Android / GAE) /** Creates a <CODE>java.awt.Image</CODE>. This image only * contains the bars without any text. * @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(); String bCode = keepNumbers(code); if (generateChecksum) bCode += getChecksum(bCode); int len = bCode.length(); int nn = (int) n; int fullWidth = len * (3 + 2 * nn) + (6 + nn); byte bars[] = getBarsInter25(bCode); boolean print = true; int ptr = 0; int height = (int) barHeight; int pix[] = new int[fullWidth * height]; for (int k = 0; k < bars.length; ++k) { int w = (bars[k] == 0 ? 1 : nn); int c = g; if (print) c = f; print = !print; for (int j = 0; j < w; ++j) pix[ptr++] = c; } for (int k = fullWidth; k < pix.length; k += fullWidth) { System.arraycopy(pix, 0, pix, k, fullWidth); } java.awt.Image img = canvas .createImage(new java.awt.image.MemoryImageSource(fullWidth, height, pix, 0, fullWidth)); return img; } }