![JAR search and dependency download from the Maven repository](/logo.png)
com.google.zxing.oned.UPCEANWriter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of core Show documentation
Show all versions of core Show documentation
Core barcode encoding/decoding library
/*
* Copyright 2009 ZXing authors
*
* 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.
*/
package com.google.zxing.oned;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import java.util.Hashtable;
/**
* Encapsulates functionality and implementation that is common to UPC and EAN families
* of one-dimensional barcodes.
*
* @author [email protected] (Ari Pollak)
*/
public abstract class UPCEANWriter implements Writer {
public BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
throws WriterException {
return encode(contents, format, width, height, null);
}
public BitMatrix encode(String contents, BarcodeFormat format, int width, int height,
Hashtable hints) throws WriterException {
if (contents == null || contents.length() == 0) {
throw new IllegalArgumentException("Found empty contents");
}
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Requested dimensions are too small: "
+ width + 'x' + height);
}
byte[] code = encode(contents);
return renderResult(code, width, height);
}
/** @return a byte array of horizontal pixels (0 = white, 1 = black) */
private static BitMatrix renderResult(byte[] code, int width, int height) {
int inputWidth = code.length;
// Add quiet zone on both sides
int fullWidth = inputWidth + (UPCEANReader.START_END_PATTERN.length << 1);
int outputWidth = Math.max(width, fullWidth);
int outputHeight = Math.max(1, height);
int multiple = outputWidth / fullWidth;
int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
BitMatrix output = new BitMatrix(outputWidth, outputHeight);
for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
if (code[inputX] == 1) {
output.setRegion(outputX, 0, multiple, outputHeight);
}
}
return output;
}
/**
* Appends the given pattern to the target array starting at pos.
*
* @param startColor
* starting color - 0 for white, 1 for black
* @return the number of elements added to target.
*/
protected static int appendPattern(byte[] target, int pos, int[] pattern, int startColor) {
if (startColor != 0 && startColor != 1) {
throw new IllegalArgumentException(
"startColor must be either 0 or 1, but got: " + startColor);
}
byte color = (byte) startColor;
int numAdded = 0;
for (int i = 0; i < pattern.length; i++) {
for (int j = 0; j < pattern[i]; j++) {
target[pos] = color;
pos += 1;
numAdded += 1;
}
color ^= 1; // flip color after each segment
}
return numAdded;
}
/** @return a byte array of horizontal pixels (0 = white, 1 = black) */
public abstract byte[] encode(String contents);
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy