Java tutorial
/* * $Id: Barcode39.java 3117 2008-01-31 05:53:22Z xlv $ * * Copyright 2002-2006 by Paulo Soares. * * The contents of this file are subject to the Mozilla Public License Version 1.1 * (the "License"); you may not use this file except in compliance with the License. * You may obtain a copy of the License at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the License. * * The Original Code is 'iText, a free JAVA-PDF library'. * * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie. * All Rights Reserved. * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved. * * Contributor(s): all the names of the contributors are added in the source code * where applicable. * * Alternatively, the contents of this file may be used under the terms of the * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the * provisions of LGPL are applicable instead of those above. If you wish to * allow use of your version of this file only under the terms of the LGPL * License and not to allow others to use your version of this file under * the MPL, indicate your decision by deleting the provisions above and * replace them with the notice and other provisions required by the LGPL. * If you do not delete the provisions above, a recipient may use your version * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE. * * This library is free software; you can redistribute it and/or modify it * under the terms of the MPL as stated above or under the terms of the GNU * Library General Public License as published by the Free Software Foundation; * either version 2 of the License, or any later version. * * This library 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 Library general Public License for more * details. * * If you didn't download this code from the following link, you should check if * you aren't using an obsolete version: * http://www.lowagie.com/iText/ */ package com.lowagie.text.pdf; import java.awt.Canvas; import java.awt.Color; import java.awt.Image; import java.awt.image.MemoryImageSource; import com.lowagie.text.Element; import com.lowagie.text.ExceptionConverter; import com.lowagie.text.Rectangle; /** Implements the code 39 and code 39 extended. 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; *startStopText = true; *extended = false; * </pre> * * @author Paulo Soares (psoares@consiste.pt) */ public class Barcode39 extends Barcode { /** The bars to generate the code. */ private static final byte BARS[][] = { { 0, 0, 0, 1, 1, 0, 1, 0, 0 }, { 1, 0, 0, 1, 0, 0, 0, 0, 1 }, { 0, 0, 1, 1, 0, 0, 0, 0, 1 }, { 1, 0, 1, 1, 0, 0, 0, 0, 0 }, { 0, 0, 0, 1, 1, 0, 0, 0, 1 }, { 1, 0, 0, 1, 1, 0, 0, 0, 0 }, { 0, 0, 1, 1, 1, 0, 0, 0, 0 }, { 0, 0, 0, 1, 0, 0, 1, 0, 1 }, { 1, 0, 0, 1, 0, 0, 1, 0, 0 }, { 0, 0, 1, 1, 0, 0, 1, 0, 0 }, { 1, 0, 0, 0, 0, 1, 0, 0, 1 }, { 0, 0, 1, 0, 0, 1, 0, 0, 1 }, { 1, 0, 1, 0, 0, 1, 0, 0, 0 }, { 0, 0, 0, 0, 1, 1, 0, 0, 1 }, { 1, 0, 0, 0, 1, 1, 0, 0, 0 }, { 0, 0, 1, 0, 1, 1, 0, 0, 0 }, { 0, 0, 0, 0, 0, 1, 1, 0, 1 }, { 1, 0, 0, 0, 0, 1, 1, 0, 0 }, { 0, 0, 1, 0, 0, 1, 1, 0, 0 }, { 0, 0, 0, 0, 1, 1, 1, 0, 0 }, { 1, 0, 0, 0, 0, 0, 0, 1, 1 }, { 0, 0, 1, 0, 0, 0, 0, 1, 1 }, { 1, 0, 1, 0, 0, 0, 0, 1, 0 }, { 0, 0, 0, 0, 1, 0, 0, 1, 1 }, { 1, 0, 0, 0, 1, 0, 0, 1, 0 }, { 0, 0, 1, 0, 1, 0, 0, 1, 0 }, { 0, 0, 0, 0, 0, 0, 1, 1, 1 }, { 1, 0, 0, 0, 0, 0, 1, 1, 0 }, { 0, 0, 1, 0, 0, 0, 1, 1, 0 }, { 0, 0, 0, 0, 1, 0, 1, 1, 0 }, { 1, 1, 0, 0, 0, 0, 0, 0, 1 }, { 0, 1, 1, 0, 0, 0, 0, 0, 1 }, { 1, 1, 1, 0, 0, 0, 0, 0, 0 }, { 0, 1, 0, 0, 1, 0, 0, 0, 1 }, { 1, 1, 0, 0, 1, 0, 0, 0, 0 }, { 0, 1, 1, 0, 1, 0, 0, 0, 0 }, { 0, 1, 0, 0, 0, 0, 1, 0, 1 }, { 1, 1, 0, 0, 0, 0, 1, 0, 0 }, { 0, 1, 1, 0, 0, 0, 1, 0, 0 }, { 0, 1, 0, 1, 0, 1, 0, 0, 0 }, { 0, 1, 0, 1, 0, 0, 0, 1, 0 }, { 0, 1, 0, 0, 0, 1, 0, 1, 0 }, { 0, 0, 0, 1, 0, 1, 0, 1, 0 }, { 0, 1, 0, 0, 1, 0, 1, 0, 0 } }; /** The index chars to <CODE>BARS</CODE>. */ private static final String CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*"; /** The character combinations to make the code 39 extended. */ private static final String EXTENDED = "%U" + "$A$B$C$D$E$F$G$H$I$J$K$L$M$N$O$P$Q$R$S$T$U$V$W$X$Y$Z" + "%A%B%C%D%E /A/B/C/D/E/F/G/H/I/J/K/L - ./O" + " 0 1 2 3 4 5 6 7 8 9/Z%F%G%H%I%J%V" + " A B C D E F G H I J K L M N O P Q R S T U V W X Y Z" + "%K%L%M%N%O%W" + "+A+B+C+D+E+F+G+H+I+J+K+L+M+N+O+P+Q+R+S+T+U+V+W+X+Y+Z" + "%P%Q%R%S%T"; /** Creates a new Barcode39. */ public Barcode39() { 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; startStopText = true; extended = false; } catch (Exception e) { throw new ExceptionConverter(e); } } /** Creates the bars. * @param text the text to create the bars. This text does not include the start and * stop characters * @return the bars */ public static byte[] getBarsCode39(String text) { text = "*" + text + "*"; byte bars[] = new byte[text.length() * 10 - 1]; for (int k = 0; k < text.length(); ++k) { int idx = CHARS.indexOf(text.charAt(k)); if (idx < 0) throw new IllegalArgumentException("The character '" + text.charAt(k) + "' is illegal in code 39."); System.arraycopy(BARS[idx], 0, bars, k * 10, 9); } return bars; } /** Converts the extended text into a normal, escaped text, * ready to generate bars. * @param text the extended text * @return the escaped text */ public static String getCode39Ex(String text) { String out = ""; for (int k = 0; k < text.length(); ++k) { char c = text.charAt(k); if (c > 127) throw new IllegalArgumentException("The character '" + c + "' is illegal in code 39 extended."); char c1 = EXTENDED.charAt(c * 2); char c2 = EXTENDED.charAt(c * 2 + 1); if (c1 != ' ') out += c1; out += c2; } return out; } /** Calculates the checksum. * @param text the text * @return the checksum */ static char getChecksum(String text) { int chk = 0; for (int k = 0; k < text.length(); ++k) { int idx = CHARS.indexOf(text.charAt(k)); if (idx < 0) throw new IllegalArgumentException("The character '" + text.charAt(k) + "' is illegal in code 39."); chk += idx; } return CHARS.charAt(chk % 43); } /** 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; String fCode = code; if (extended) fCode = getCode39Ex(code); 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(fCode); if (startStopText) fullCode = "*" + fullCode + "*"; fontX = font.getWidthPoint(altText != null ? altText : fullCode, size); } int len = fCode.length() + 2; if (generateChecksum) ++len; float fullWidth = len * (6 * x + 3 * x * n) + (len - 1) * 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, Color barColor, Color textColor) { String fullCode = code; float fontX = 0; String bCode = code; if (extended) bCode = getCode39Ex(code); if (font != null) { if (generateChecksum && checksumText) fullCode += getChecksum(bCode); if (startStopText) fullCode = "*" + fullCode + "*"; fontX = font.getWidthPoint(fullCode = altText != null ? altText : fullCode, size); } if (generateChecksum) bCode += getChecksum(bCode); int len = bCode.length() + 2; float fullWidth = len * (6 * x + 3 * x * n) + (len - 1) * 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[] = getBarsCode39(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(); } /** 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(Color foreground, Color background) { int f = foreground.getRGB(); int g = background.getRGB(); Canvas canvas = new Canvas(); String bCode = code; if (extended) bCode = getCode39Ex(code); if (generateChecksum) bCode += getChecksum(bCode); int len = bCode.length() + 2; int nn = (int) n; int fullWidth = len * (6 + 3 * nn) + (len - 1); byte bars[] = getBarsCode39(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); } Image img = canvas.createImage(new MemoryImageSource(fullWidth, height, pix, 0, fullWidth)); return img; } }