Java tutorial
/* * $Id: BarcodeInter25.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 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 (psoares@consiste.pt) */ 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("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, Color barColor, Color 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(); } /** 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 = 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); } Image img = canvas.createImage(new MemoryImageSource(fullWidth, height, pix, 0, fullWidth)); return img; } }