org.krysalis.barcode4j.impl.upcean.UPCEANCanvasLogicHandler Maven / Gradle / Ivy
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Barcode4J is a flexible generator for barcodes written in Java.
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/*
* Copyright 2002-2004 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.
*/
package org.krysalis.barcode4j.impl.upcean;
import java.util.Stack;
import org.krysalis.barcode4j.BarGroup;
import org.krysalis.barcode4j.BarcodeDimension;
import org.krysalis.barcode4j.ClassicBarcodeLogicHandler;
import org.krysalis.barcode4j.HumanReadablePlacement;
import org.krysalis.barcode4j.TextAlignment;
import org.krysalis.barcode4j.impl.AbstractBarcodeBean;
import org.krysalis.barcode4j.impl.DrawingUtil;
import org.krysalis.barcode4j.output.Canvas;
/**
* Logic Handler implementation for painting on a Canvas. This is a special
* implementation for UPC and EAN barcodes.
*
* @author Jeremias Maerki
* @version $Id: UPCEANCanvasLogicHandler.java,v 1.3 2008-05-13 13:00:44 jmaerki Exp $
*/
public class UPCEANCanvasLogicHandler implements ClassicBarcodeLogicHandler {
private final UPCEANBean bcBean;
private final Canvas canvas;
private double x = 0.0;
private BarcodeDimension dim;
private String msg;
private String lastgroup;
private double groupx;
private boolean inMsgGroup;
private boolean inSupplemental;
private final Stack groupStack = new Stack();
/**
* Main constructor.
*
* @param bcBean the barcode implementation class
* @param canvas the canvas to paint to
*/
public UPCEANCanvasLogicHandler(AbstractBarcodeBean bcBean, Canvas canvas) {
if (!(bcBean instanceof UPCEANBean)) {
throw new IllegalArgumentException("This LogicHandler can only be "
+ "used with UPC and EAN barcode implementations");
}
this.bcBean = (UPCEANBean) bcBean;
this.canvas = canvas;
}
private double getStartX() {
if (bcBean.hasQuietZone()) {
return bcBean.getQuietZone();
}
else {
return 0.0;
}
}
/**
* @see org.krysalis.barcode4j.ClassicBarcodeLogicHandler
*/
public void startBarcode(String msg, String formattedMsg) {
this.msg = msg;
//Calculate extents
this.dim = bcBean.calcDimensions(msg);
canvas.establishDimensions(dim);
x = getStartX();
inMsgGroup = false;
inSupplemental = false;
}
/**
* @see org.krysalis.barcode4j.ClassicBarcodeLogicHandler
*/
public void endBarcode() {
}
/**
* @see org.krysalis.barcode4j.ClassicBarcodeLogicHandler
*/
public void startBarGroup(BarGroup type, String submsg) {
if (type == BarGroup.UPC_EAN_GUARD) {
//nop
}
else if (type == BarGroup.UPC_EAN_GROUP) {
inMsgGroup = true;
groupx = x;
lastgroup = submsg;
}
else if (type == BarGroup.UPC_EAN_LEAD) {
lastgroup = submsg;
}
else if (type == BarGroup.UPC_EAN_CHECK) {
if (!inMsgGroup) {
lastgroup = submsg;
}
}
else if (type == BarGroup.UPC_EAN_SUPP) {
inSupplemental = true;
x += bcBean.getQuietZone();
groupx = x;
}
groupStack.push(type);
}
/**
* @see org.krysalis.barcode4j.ClassicBarcodeLogicHandler
*/
public void addBar(boolean black, int width) {
final double w = bcBean.getBarWidth(width);
if (black) {
final double h;
final double y;
if (!inSupplemental) {
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
canvas.drawRectWH(x, 0, w, bcBean.getHeight());
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
if (inMsgGroup) {
h = bcBean.getBarHeight();
y = bcBean.getHumanReadableHeight();
}
else {
h = bcBean.getBarHeight() + (bcBean.getHumanReadableHeight() / 2);
y = bcBean.getHumanReadableHeight() / 2;
}
canvas.drawRectWH(x, y, w, h);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
if (inMsgGroup) {
h = bcBean.getBarHeight();
}
else {
h = bcBean.getBarHeight() + (bcBean.getHumanReadableHeight() / 2);
}
canvas.drawRectWH(x, 0.0, w, h);
}
}
else {
//Special painting in supplemental
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
h = bcBean.getBarHeight();
y = bcBean.getHumanReadableHeight();
canvas.drawRectWH(x, y, w, h);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
h = bcBean.getBarHeight()
+ (bcBean.getHumanReadableHeight() / 2)
- bcBean.getHumanReadableHeight();
y = bcBean.getHumanReadableHeight() / 2;
canvas.drawRectWH(x, y, w, h);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
h = bcBean.getBarHeight()
+ (bcBean.getHumanReadableHeight() / 2)
- bcBean.getHumanReadableHeight();
y = bcBean.getHumanReadableHeight();
canvas.drawRectWH(x, y, w, h);
}
}
}
x += w;
}
/**
* @see org.krysalis.barcode4j.ClassicBarcodeLogicHandler
*/
public void endBarGroup() {
BarGroup group = (BarGroup) groupStack.pop();
if (group == BarGroup.UPC_EAN_GROUP) {
inMsgGroup = false;
if (lastgroup == null) {
//Guards don't set the lastgroup variable
return;
}
int colonPos = lastgroup.indexOf(":");
String grouptext = lastgroup;
if (colonPos >= 0) {
String lead = Character.toString(grouptext.charAt(0));
drawLeadChar(lead);
grouptext = grouptext.substring(colonPos + 1);
}
//character group text
drawGroupText(grouptext);
}
else if (group == BarGroup.UPC_EAN_LEAD) {
if (!isEAN()) {
drawLeadChar(lastgroup);
}
}
else if (group == BarGroup.UPC_EAN_CHECK) {
if (!isEAN()) {
drawTrailingChar(lastgroup);
}
}
else if (group == BarGroup.UPC_EAN_SUPP) {
drawSupplementalText(UPCEANLogicImpl.retrieveSupplemental(this.msg));
inSupplemental = false;
}
}
private boolean isEAN() {
return (bcBean instanceof EAN13Bean) || (bcBean instanceof EAN8Bean);
}
private void drawLeadChar(String lead) {
final double leadw = 7 * bcBean.getBarWidth(1);
final double leadx = getStartX()
- 3 * bcBean.getBarWidth(1)
- leadw;
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
//nop
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
DrawingUtil.drawText(canvas, bcBean,
lead, leadx, leadx + leadw,
bcBean.getHumanReadableHeight(), TextAlignment.TA_CENTER);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
DrawingUtil.drawText(canvas, bcBean,
lead, leadx, leadx + leadw,
bcBean.getHeight(), TextAlignment.TA_CENTER);
}
}
private void drawTrailingChar(String trailer) {
final double trailerw = 7 * bcBean.getBarWidth(1);
final double trailerx = getStartX()
+ this.dim.getWidth()
- bcBean.supplementalWidth(this.msg)
+ 3 * bcBean.getBarWidth(1);
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
//nop
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
DrawingUtil.drawText(canvas, bcBean,
trailer, trailerx, trailerx + trailerw,
bcBean.getHumanReadableHeight(), TextAlignment.TA_CENTER);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
DrawingUtil.drawText(canvas, bcBean,
trailer, trailerx, trailerx + trailerw,
bcBean.getHeight(), TextAlignment.TA_CENTER);
}
}
private void drawGroupText(String text) {
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_NONE) {
//nop
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
DrawingUtil.drawText(canvas, bcBean, text,
groupx + bcBean.getBarWidth(1),
x - bcBean.getBarWidth(1),
bcBean.getHumanReadableHeight(), TextAlignment.TA_JUSTIFY);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
DrawingUtil.drawText(canvas, bcBean, text,
groupx + bcBean.getBarWidth(1),
x - bcBean.getBarWidth(1),
bcBean.getHeight(), TextAlignment.TA_JUSTIFY);
}
}
private void drawSupplementalText(String supp) {
if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_TOP) {
DrawingUtil.drawText(canvas, bcBean, supp,
groupx,
x,
bcBean.getHeight(), TextAlignment.TA_CENTER);
}
else if (bcBean.getMsgPosition() == HumanReadablePlacement.HRP_BOTTOM) {
DrawingUtil.drawText(canvas, bcBean, supp,
groupx,
x,
bcBean.getHumanReadableHeight(), TextAlignment.TA_CENTER);
}
}
}
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