2 * Copyright 2009 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.oned;
19 import java.util.Hashtable;
21 import com.google.zxing.BarcodeFormat;
22 import com.google.zxing.WriterException;
23 import com.google.zxing.common.ByteMatrix;
26 * <p>Encapsulates functionality and implementation that is common to UPC and EAN families
27 * of one-dimensional barcodes.</p>
29 * @author aripollak@gmail.com (Ari Pollak)
31 public abstract class AbstractUPCEANWriter implements UPCEANWriter {
33 public ByteMatrix encode(String contents, BarcodeFormat format, int width, int height)
34 throws WriterException {
35 return encode(contents, format, width, height, null);
38 public ByteMatrix encode(String contents, BarcodeFormat format, int width, int height,
39 Hashtable hints) throws WriterException {
40 if (contents == null || contents.length() == 0) {
41 throw new IllegalArgumentException("Found empty contents");
44 if (width < 0 || height < 0) {
45 throw new IllegalArgumentException("Requested dimensions are too small: "
46 + width + 'x' + height);
49 byte[] code = encode(contents);
50 return renderResult(code, width, height);
53 /** @return a byte array of horizontal pixels (0 = white, 1 = black) */
54 private static ByteMatrix renderResult(byte[] code, int width, int height) {
55 int inputWidth = code.length;
56 // Add quiet zone on both sides
57 int fullWidth = inputWidth + (AbstractUPCEANReader.START_END_PATTERN.length << 1);
58 int outputWidth = Math.max(width, fullWidth);
59 int outputHeight = Math.max(1, height);
61 int multiple = outputWidth / fullWidth;
62 int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
64 ByteMatrix output = new ByteMatrix(outputWidth, outputHeight);
65 byte[][] outputArray = output.getArray();
67 byte[] row = new byte[outputWidth];
69 // a. Write the white pixels at the left of each row
70 for (int x = 0; x < leftPadding; x++) {
74 // b. Write the contents of this row of the barcode
75 int offset = leftPadding;
76 for (int x = 0; x < inputWidth; x++) {
77 byte value = (code[x] == 1) ? 0 : (byte) 255;
78 for (int z = 0; z < multiple; z++) {
79 row[offset + z] = value;
84 // c. Write the white pixels at the right of each row
85 offset = leftPadding + (inputWidth * multiple);
86 for (int x = offset; x < outputWidth; x++) {
90 // d. Write the completed row multiple times
91 for (int z = 0; z < outputHeight; z++) {
92 System.arraycopy(row, 0, outputArray[z], 0, outputWidth);
100 * Appends the given pattern to the target array starting at pos.
103 * starting color - 0 for white, 1 for black
104 * @return the number of elements added to target.
106 protected static int appendPattern(byte[] target, int pos, int[] pattern, int startColor) {
107 if (startColor != 0 && startColor != 1) {
108 throw new IllegalArgumentException(
109 "startColor must be either 0 or 1, but got: " + startColor);
112 byte color = (byte) startColor;
114 for (int i = 0; i < pattern.length; i++) {
115 for (int j = 0; j < pattern[i]; j++) {
120 color ^= 1; // flip color after each segment