barcodeean.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * Copyright 2002 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 java.util.Arrays;

import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Rectangle;

/** Generates barcodes in several formats: EAN13, EAN8, UPCA, UPCE,
 * supplemental 2 and 5. The default parameters are:
 * <pre>
 *x = 0.8f;
 *font = BaseFont.createFont("Helvetica", "winansi", false);
 *size = 8;
 *baseline = size;
 *barHeight = size * 3;
 *guardBars = true;
 *codeType = EAN13;
 *code = "";
 * </pre>
 *
 * @author Paulo Soares ([e-mail])
 */
public class BarcodeEAN extends Barcode{
        
    /** The bar positions that are guard bars.*/    
	private static final int GUARD_EMPTY[] = {};
    /** The bar positions that are guard bars.*/    
	private static final int GUARD_UPCA[] = {0, 2, 4, 6, 28, 30, 52, 54, 56, 58};
    /** The bar positions that are guard bars.*/    
	private static final int GUARD_EAN13[] = {0, 2, 28, 30, 56, 58};
    /** The bar positions that are guard bars.*/    
	private static final int GUARD_EAN8[] = {0, 2, 20, 22, 40, 42};
    /** The bar positions that are guard bars.*/    
	private static final int GUARD_UPCE[] = {0, 2, 28, 30, 32};
    /** The x coordinates to place the text.*/
	private static final float TEXTPOS_EAN13[] = {6.5f, 13.5f, 20.5f, 27.5f, 34.5f, 41.5f, 53.5f, 60.5f, 67.5f, 74.5f, 81.5f, 88.5f};
    /** The x coordinates to place the text.*/
	private static final float TEXTPOS_EAN8[] = {6.5f, 13.5f, 20.5f, 27.5f, 39.5f, 46.5f, 53.5f, 60.5f};
    /** The basic bar widths.*/
	private static final byte BARS[][] = 
    {
        {3, 2, 1, 1}, // 0
        {2, 2, 2, 1}, // 1
        {2, 1, 2, 2}, // 2
        {1, 4, 1, 1}, // 3
        {1, 1, 3, 2}, // 4
        {1, 2, 3, 1}, // 5
        {1, 1, 1, 4}, // 6
        {1, 3, 1, 2}, // 7
        {1, 2, 1, 3}, // 8
        {3, 1, 1, 2}  // 9
    };
    
    /** The total number of bars for EAN13.*/
	private static final int TOTALBARS_EAN13 = 11 + 12 * 4;
    /** The total number of bars for EAN8.*/
	private static final int TOTALBARS_EAN8 = 11 + 8 * 4;
    /** The total number of bars for UPCE.*/
	private static final int TOTALBARS_UPCE = 9 + 6 * 4;
    /** The total number of bars for supplemental 2.*/
	private static final int TOTALBARS_SUPP2 = 13;
    /** The total number of bars for supplemental 5.*/
	private static final int TOTALBARS_SUPP5 = 31;
    /** Marker for odd parity.*/
	private static final int ODD = 0;
    /** Marker for even parity.*/
	private static final int EVEN = 1;
    
    /** Sequence of parities to be used with EAN13.*/
    private static final byte PARITY13[][] =
    {
        {ODD, ODD,  ODD,  ODD,  ODD,  ODD},  // 0
        {ODD, ODD,  EVEN, ODD,  EVEN, EVEN}, // 1
        {ODD, ODD,  EVEN, EVEN, ODD,  EVEN}, // 2
        {ODD, ODD,  EVEN, EVEN, EVEN, ODD},  // 3
        {ODD, EVEN, ODD,  ODD,  EVEN, EVEN}, // 4
        {ODD, EVEN, EVEN, ODD,  ODD,  EVEN}, // 5
        {ODD, EVEN, EVEN, EVEN, ODD,  ODD},  // 6
        {ODD, EVEN, ODD,  EVEN, ODD,  EVEN}, // 7
        {ODD, EVEN, ODD,  EVEN, EVEN, ODD},  // 8
        {ODD, EVEN, EVEN, ODD,  EVEN, ODD}   // 9
    };
    
    /** Sequence of parities to be used with supplemental 2.*/
    private static final byte PARITY2[][] =
    {
        {ODD,  ODD},   // 0
        {ODD,  EVEN},  // 1
        {EVEN, ODD},   // 2
        {EVEN, EVEN}   // 3
    };
    
    /** Sequence of parities to be used with supplemental 2.*/
    private static final byte PARITY5[][] =
    {
        {EVEN, EVEN, ODD,  ODD,  ODD},  // 0
        {EVEN, ODD,  EVEN, ODD,  ODD},  // 1
        {EVEN, ODD,  ODD,  EVEN, ODD},  // 2
        {EVEN, ODD,  ODD,  ODD,  EVEN}, // 3
        {ODD,  EVEN, EVEN, ODD,  ODD},  // 4
        {ODD,  ODD,  EVEN, EVEN, ODD},  // 5
        {ODD,  ODD,  ODD,  EVEN, EVEN}, // 6
        {ODD,  EVEN, ODD,  EVEN, ODD},  // 7
        {ODD,  EVEN, ODD,  ODD,  EVEN}, // 8
        {ODD,  ODD,  EVEN, ODD,  EVEN}  // 9
    };
    
    /** Sequence of parities to be used with UPCE.*/
    private static final byte PARITYE[][] =
    {
        {EVEN, EVEN, EVEN, ODD,  ODD,  ODD},  // 0
        {EVEN, EVEN, ODD,  EVEN, ODD,  ODD},  // 1
        {EVEN, EVEN, ODD,  ODD,  EVEN, ODD},  // 2
        {EVEN, EVEN, ODD,  ODD,  ODD,  EVEN}, // 3
        {EVEN, ODD,  EVEN, EVEN, ODD,  ODD},  // 4
        {EVEN, ODD,  ODD,  EVEN, EVEN, ODD},  // 5
        {EVEN, ODD,  ODD,  ODD,  EVEN, EVEN}, // 6
        {EVEN, ODD,  EVEN, ODD,  EVEN, ODD},  // 7
        {EVEN, ODD,  EVEN, ODD,  ODD,  EVEN}, // 8
        {EVEN, ODD,  ODD,  EVEN, ODD,  EVEN}  // 9
    };
    
    /** Creates new BarcodeEAN */
    public BarcodeEAN() {
        try {
            x = 0.8f;
            font = BaseFont.createFont("Helvetica", "winansi", false);
            size = 8;
            baseline = size;
            barHeight = size * 3;
            guardBars = true;
            codeType = EAN13;
            code = "";
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    /** Calculates the EAN parity character.
     * @param code the code
     * @return the parity character
     */    
    public static int calculateEANParity(String code) {
        int mul = 3;
        int total = 0;
        for (int k = code.length() - 1; k >= 0; --k) {
            int n = code.charAt(k) - '0';
            total += mul * n;
            mul ^= 2;
        }
        return (10 - (total % 10)) % 10;
    }
    
    /** Converts an UPCA code into an UPCE code. If the code can not
     * be converted a <CODE>null</CODE> is returned.
     * @param text the code to convert. It must have 12 numeric characters
     * @return the 8 converted digits or <CODE>null</CODE> if the
     * code could not be converted
     */    
    static public String convertUPCAtoUPCE(String text) {
        if (text.length() != 12 || !(text.startsWith("0") || text.startsWith("1")))
            return null;
        if (text.substring(3, 6).equals("000") || text.substring(3, 6).equals("100")
            || text.substring(3, 6).equals("200")) {
                if (text.substring(6, 8).equals("00"))
                    return text.substring(0, 1) + text.substring(1, 3) + text.substring(8, 11) + text.substring(3, 4) + text.substring(11);
        }
        else if (text.substring(4, 6).equals("00")) {
            if (text.substring(6, 9).equals("000"))
                return text.substring(0, 1) + text.substring(1, 4) + text.substring(9, 11) + "3" + text.substring(11);
        }
        else if (text.substring(5, 6).equals("0")) {
            if (text.substring(6, 10).equals("0000"))
                return text.substring(0, 1) + text.substring(1, 5) + text.substring(10, 11) + "4" + text.substring(11);
        }
        else if (text.charAt(10) >= '5') {
            if (text.substring(6, 10).equals("0000"))
                return text.substring(0, 1) + text.substring(1, 6) + text.substring(10, 11) + text.substring(11);
        }
        return null;
    }
    
    /** Creates the bars for the barcode EAN13 and UPCA.
     * @param _code the text with 13 digits
     * @return the barcode
     */    
    public static byte[] getBarsEAN13(String _code) {
        int code[] = new int[_code.length()];
        for (int k = 0; k < code.length; ++k)
            code[k] = _code.charAt(k) - '0';
        byte bars[] = new byte[TOTALBARS_EAN13];
        int pb = 0;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        byte sequence[] = PARITY13[code[0]];
        for (int k = 0; k < sequence.length; ++k) {
            int c = code[k + 1];
            byte stripes[] = BARS[c];
            if (sequence[k] == ODD) {
                bars[pb++] = stripes[0];
                bars[pb++] = stripes[1];
                bars[pb++] = stripes[2];
                bars[pb++] = stripes[3];
            }
            else {
                bars[pb++] = stripes[3];
                bars[pb++] = stripes[2];
                bars[pb++] = stripes[1];
                bars[pb++] = stripes[0];
            }
        }
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        for (int k = 7; k < 13; ++k) {
            int c = code[k];
            byte stripes[] = BARS[c];
            bars[pb++] = stripes[0];
            bars[pb++] = stripes[1];
            bars[pb++] = stripes[2];
            bars[pb++] = stripes[3];
        }
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        return bars;
    }
    
    /** Creates the bars for the barcode EAN8.
     * @param _code the text with 8 digits
     * @return the barcode
     */    
    public static byte[] getBarsEAN8(String _code) {
        int code[] = new int[_code.length()];
        for (int k = 0; k < code.length; ++k)
            code[k] = _code.charAt(k) - '0';
        byte bars[] = new byte[TOTALBARS_EAN8];
        int pb = 0;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        for (int k = 0; k < 4; ++k) {
            int c = code[k];
            byte stripes[] = BARS[c];
            bars[pb++] = stripes[0];
            bars[pb++] = stripes[1];
            bars[pb++] = stripes[2];
            bars[pb++] = stripes[3];
        }
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        for (int k = 4; k < 8; ++k) {
            int c = code[k];
            byte stripes[] = BARS[c];
            bars[pb++] = stripes[0];
            bars[pb++] = stripes[1];
            bars[pb++] = stripes[2];
            bars[pb++] = stripes[3];
        }
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        return bars;
    }
    
    /** Creates the bars for the barcode UPCE.
     * @param _code the text with 8 digits
     * @return the barcode
     */    
    public static byte[] getBarsUPCE(String _code) {
        int code[] = new int[_code.length()];
        for (int k = 0; k < code.length; ++k)
            code[k] = _code.charAt(k) - '0';
        byte bars[] = new byte[TOTALBARS_UPCE];
        boolean flip = (code[0] != 0);
        int pb = 0;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        byte sequence[] = PARITYE[code[code.length - 1]];
        for (int k = 1; k < code.length - 1; ++k) {
            int c = code[k];
            byte stripes[] = BARS[c];
            if (sequence[k - 1] == (flip ? EVEN : ODD)) {
                bars[pb++] = stripes[0];
                bars[pb++] = stripes[1];
                bars[pb++] = stripes[2];
                bars[pb++] = stripes[3];
            }
            else {
                bars[pb++] = stripes[3];
                bars[pb++] = stripes[2];
                bars[pb++] = stripes[1];
                bars[pb++] = stripes[0];
            }
        }
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        bars[pb++] = 1;
        return bars;