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iText, a free Java-PDF library
/*
* $Id: BarcodeCodabar.java 2376 2006-09-15 06:18:47Z 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 codabar. The default parameters are:
*
*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;
*
*
* @author Paulo Soares ([email protected])
*/
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 BARS.
*/
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("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("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("In codabar, start/stop characters are only allowed at the extremes.");
if (idx < 0)
throw new IllegalArgumentException("The character '" + text.charAt(k) + "' is illegal in codabar.");
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 += (int)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 PdfContentByte. The
* barcode is always placed at coodinates (0, 0). Use the
* translation matrix to move it elsewhere.
* The bars and text are written in the following colors:
*
*
* barColor
textColor
Result
*
* null
null
bars and text painted with current fill color
*
* barColor
null
bars and text painted with barColor
*
* null
textColor
bars painted with current color
text painted with textColor
*
* barColor
textColor
bars painted with barColor
text painted with textColor
*
* @param cb the PdfContentByte where the barcode will be placed
* @param barColor the color of the bars. It can be null
* @param textColor the color of the text. It can be null
* @return the dimensions the barcode occupies
*/
public Rectangle placeBarcode(PdfContentByte cb, Color barColor, Color 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 += (int)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();
}
/** Creates a java.awt.Image. 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 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 += (int)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);
}
Image img = canvas.createImage(new MemoryImageSource(fullWidth, height, pix, 0, fullWidth));
return img;
}
}