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Barcode4J is a flexible generator for barcodes written in Java inclusive
extensions to support Apache FOP 0.93 and later.
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/*
* Copyright 2006 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: DataMatrixPlacement.java,v 1.2 2006/12/01 13:29:43 jmaerki Exp $ */
package org.krysalis.barcode4j.impl.datamatrix;
/**
* Symbol Character Placement Program. Adapted from Annex M.1 in ISO/IEC 16022:2000(E).
*
* @version $Id: DataMatrixPlacement.java,v 1.2 2006/12/01 13:29:43 jmaerki Exp $
*/
public abstract class DataMatrixPlacement {
private String codewords;
protected int numrows;
protected int numcols;
public DataMatrixPlacement(String codewords, int numcols, int numrows) {
this.codewords = codewords;
this.numcols = numcols;
this.numrows = numrows;
}
protected abstract void setBit(int col, int row, boolean bit);
protected abstract boolean getBit(int col, int row);
protected abstract boolean hasBit(int col, int row);
public void place() {
int pos = 0;
int row = 4;
int col = 0;
do {
/* repeatedly first check for one of the special corner cases, then... */
if ((row == numrows) && (col == 0)) {
corner1(pos++);
}
if ((row == numrows - 2) && (col == 0) && ((numcols % 4) != 0)) {
corner2(pos++);
}
if ((row == numrows - 2) && (col == 0) && ((numcols % 8 == 4))) {
corner3(pos++);
}
if ((row == numrows + 4) && (col == 2) && (!((numcols % 8) != 0))) {
corner4(pos++);
}
/* sweep upward diagonally, inserting successive characters... */
do {
if ((row < numrows) && (col >= 0) && !hasBit(col, row)) {
utah(row, col, pos++);
}
row -= 2;
col += 2;
} while ((row >= 0 && (col < numcols)));
row++;
col += 3;
/* and then sweep downward diagonally, inserting successive characters, ... */
do {
if ((row >= 0) && (col < numcols) && !hasBit(col, row)) {
utah(row, col, pos++);
}
row += 2;
col -= 2;
} while ((row < numrows) && (col >= 0));
row += 3; col += 1;
/* ...until the entire array is scanned */
} while ((row < numrows) || (col < numcols));
/* Lastly, if the lower righthand corner is untouched, fill in fixed pattern */
if (!hasBit(numcols - 1, numrows - 1)) {
setBit(numcols - 1, numrows - 1, true);
setBit(numcols - 2, numrows - 2, true);
}
}
private void module(int row, int col, int pos, int bit) {
if (row < 0) {
row += numrows;
col += 4 - ((numrows + 4) % 8);
}
if (col < 0) {
col += numcols;
row += 4 - ((numcols + 4) % 8);
}
char c = codewords.charAt(pos);
int v = (int)c;
v &= 1 << (8 - bit);
setBit(col, row, v != 0);
}
/**
* Places the 8 bits of a utah-shaped symbol character in ECC200.
* @param row the row
* @param col the column
* @param pos character position
*/
private void utah(int row, int col, int pos) {
module(row - 2, col - 2, pos, 1);
module(row - 2, col - 1, pos, 2);
module(row - 1, col - 2, pos, 3);
module(row - 1, col - 1, pos, 4);
module(row - 1, col, pos, 5);
module(row, col - 2, pos, 6);
module(row, col - 1, pos, 7);
module(row, col, pos, 8);
}
private void corner1(int pos) {
module(numrows - 1, 0, pos, 1);
module(numrows - 1, 1, pos, 2);
module(numrows - 1, 2, pos, 3);
module(0, numcols - 2, pos, 4);
module(0, numcols - 1, pos, 5);
module(1, numcols - 1, pos, 6);
module(2, numcols - 1, pos, 7);
module(3, numcols - 1, pos, 8);
}
private void corner2(int pos) {
module(numrows - 3, 0, pos, 1);
module(numrows - 2, 0, pos, 2);
module(numrows - 1, 0, pos, 3);
module(0, numcols - 4, pos, 4);
module(0, numcols - 3, pos, 5);
module(0, numcols - 2, pos, 6);
module(0, numcols - 1, pos, 7);
module(1, numcols - 1, pos, 8);
}
private void corner3(int pos) {
module(numrows - 3, 0, pos, 1);
module(numrows - 2, 0, pos, 2);
module(numrows - 1, 0, pos, 3);
module(0, numcols - 2, pos, 4);
module(0, numcols - 1, pos, 5);
module(1, numcols - 1, pos, 6);
module(2, numcols - 1, pos, 7);
module(3, numcols - 1, pos, 8);
}
private void corner4(int pos) {
module(numrows - 1, 0, pos, 1);
module(numrows - 1, numcols - 1, pos, 2);
module(0, numcols - 3, pos, 3);
module(0, numcols - 2, pos, 4);
module(0, numcols - 1, pos, 5);
module(1, numcols - 3, pos, 6);
module(1, numcols - 2, pos, 7);
module(1, numcols - 1, pos, 8);
}
}