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 codabar. 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 = false; * </pre> * * @author Paulo Soares */ public class BarcodeCodabar extends Barcode { /** The bars to generate the code. */ private static final byte BARS[][] = { { 0, 0, 0, 0, 0, 1, 1 }, // 0 { 0, 0, 0, 0, 1, 1, 0 }, // 1 { 0, 0, 0, 1, 0, 0, 1 }, // 2 { 1, 1, 0, 0, 0, 0, 0 }, // 3 { 0, 0, 1, 0, 0, 1, 0 }, // 4 { 1, 0, 0, 0, 0, 1, 0 }, // 5 { 0, 1, 0, 0, 0, 0, 1 }, // 6 { 0, 1, 0, 0, 1, 0, 0 }, // 7 { 0, 1, 1, 0, 0, 0, 0 }, // 8 { 1, 0, 0, 1, 0, 0, 0 }, // 9 { 0, 0, 0, 1, 1, 0, 0 }, // - { 0, 0, 1, 1, 0, 0, 0 }, // $ { 1, 0, 0, 0, 1, 0, 1 }, // : { 1, 0, 1, 0, 0, 0, 1 }, // / { 1, 0, 1, 0, 1, 0, 0 }, // . { 0, 0, 1, 0, 1, 0, 1 }, // + { 0, 0, 1, 1, 0, 1, 0 }, // a { 0, 1, 0, 1, 0, 0, 1 }, // b { 0, 0, 0, 1, 0, 1, 1 }, // c { 0, 0, 0, 1, 1, 1, 0 } // d }; /** The index chars to <CODE>BARS</CODE>. */ private static final String CHARS = "0123456789-$:/.+ABCD"; private static final int START_STOP_IDX = 16; /** Creates a new BarcodeCodabar. */ public BarcodeCodabar() { 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 = false; codeType = CODABAR; } catch (Exception e) { throw new ExceptionConverter(e); } } /** Creates the bars. * @param text the text to create the bars * @return the bars */ public static byte[] getBarsCodabar(String text) { text = text.toUpperCase(); int len = text.length(); if (len < 2) throw new IllegalArgumentException(MessageLocalization .getComposedMessage("codabar.must.have.at.least.a.start.and.stop.character")); if (CHARS.indexOf(text.charAt(0)) < START_STOP_IDX || CHARS.indexOf(text.charAt(len - 1)) < START_STOP_IDX) throw new IllegalArgumentException(MessageLocalization .getComposedMessage("codabar.must.have.one.of.abcd.as.start.stop.character")); byte bars[] = new byte[text.length() * 8 - 1]; for (int k = 0; k < len; ++k) { int idx = CHARS.indexOf(text.charAt(k)); if (idx >= START_STOP_IDX && k > 0 && k < len - 1) throw new IllegalArgumentException(MessageLocalization .getComposedMessage("in.codabar.start.stop.characters.are.only.allowed.at.the.extremes")); if (idx < 0) throw new IllegalArgumentException(MessageLocalization .getComposedMessage("the.character.1.is.illegal.in.codabar", text.charAt(k))); System.arraycopy(BARS[idx], 0, bars, k * 8, 7); } return bars; } public static String calculateChecksum(String code) { if (code.length() < 2) return code; String text = code.toUpperCase(); int sum = 0; int len = text.length(); for (int k = 0; k < len; ++k) sum += CHARS.indexOf(text.charAt(k)); sum = (sum + 15) / 16 * 16 - sum; return code.substring(0, len - 1) + CHARS.charAt(sum) + code.substring(len - 1); } /** 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 text = code; if (generateChecksum && checksumText) text = calculateChecksum(code); if (!startStopText) text = text.substring(1, text.length() - 1); if (font != null) { if (baseline > 0) fontY = baseline - font.getFontDescriptor(BaseFont.DESCENT, size); else fontY = -baseline + size; fontX = font.getWidthPoint(altText != null ? altText : text, size); } text = code; if (generateChecksum) text = calculateChecksum(code); byte bars[] = getBarsCodabar(text); int wide = 0; for (int k = 0; k < bars.length; ++k) { wide += bars[k]; } int narrow = bars.length - wide; float fullWidth = x * (narrow + wide * n); 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; if (generateChecksum && checksumText) fullCode = calculateChecksum(code); if (!startStopText) fullCode = fullCode.substring(1, fullCode.length() - 1); float fontX = 0; if (font != null) { fontX = font.getWidthPoint(fullCode = altText != null ? altText : fullCode, size); } byte bars[] = getBarsCodabar(generateChecksum ? calculateChecksum(code) : code); int wide = 0; for (int k = 0; k < bars.length; ++k) { wide += bars[k]; } int narrow = bars.length - wide; float fullWidth = x * (narrow + wide * n); 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; } } 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 fullCode = code; if (generateChecksum && checksumText) fullCode = calculateChecksum(code); if (!startStopText) fullCode = fullCode.substring(1, fullCode.length() - 1); byte bars[] = getBarsCodabar(generateChecksum ? calculateChecksum(code) : code); int wide = 0; for (int k = 0; k < bars.length; ++k) { wide += bars[k]; } int narrow = bars.length - wide; int fullWidth = narrow + wide * (int) n; 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 : (int) n); 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; } }