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Barcode4J is a flexible generator for barcodes written in Java inclusive
extensions to support Apache FOP 0.93 and later.
The newest version!
/*
* Copyright 2002-2004,2006,2008 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.output.eps;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.SimpleDateFormat;
import org.krysalis.barcode4j.BarcodeDimension;
import org.krysalis.barcode4j.TextAlignment;
import org.krysalis.barcode4j.output.AbstractCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;
/**
* CanvasProvider implementation for EPS output (Encapsulated PostScript).
* @author Jeremias Maerki
* @version $Id: EPSCanvasProvider.java,v 1.6 2008/05/13 13:00:46 jmaerki Exp $
*/
public class EPSCanvasProvider extends AbstractCanvasProvider {
private Writer writer;
private DecimalFormat df;
private IOException firstError;
private double height;
/**
* Main constructor.
* @param out OutputStream to write the EPS to
* @param orientation the barcode orientation (0, 90, 180, 270)
* @throws IOException in case of an I/O problem
*/
public EPSCanvasProvider(OutputStream out, int orientation) throws IOException {
super(orientation);
try {
this.writer = new java.io.OutputStreamWriter(out, "US-ASCII");
} catch (UnsupportedEncodingException uee) {
throw new RuntimeException(
"Incompatible VM: Need US-ASCII encoding. " + uee.getMessage());
}
}
/**
* Returns the DecimalFormat instance to use internally to format numbers.
* @return a DecimalFormat instance
*/
protected DecimalFormat getDecimalFormat() {
if (this.df == null) {
DecimalFormatSymbols dfs = new DecimalFormatSymbols();
dfs.setDecimalSeparator('.');
this.df = new DecimalFormat("0.####", dfs);
}
return this.df;
}
private String format(double coord) {
return getDecimalFormat().format(coord);
}
private String formatmm(double coord) {
return getDecimalFormat().format(UnitConv.mm2pt(coord));
}
private String formatmm(double x, double y) {
return formatmm(x) + " " + formatmm(this.height - y);
}
private void writeHeader(double width, double height) throws IOException {
writer.write("%!PS-Adobe-3.0 EPSF-3.0\n");
double widthpt = UnitConv.mm2pt(width);
double heightpt = UnitConv.mm2pt(height);
writer.write("%%BoundingBox: 0 0 "
+ Math.round(Math.ceil(widthpt)) + " "
+ Math.round(Math.ceil(heightpt)) + "\n");
writer.write("%%HiResBoundingBox: 0 0 "
+ format(widthpt) + " "
+ format(heightpt) + "\n");
writer.write("%%Creator: Barcode4J (http://barcode4j.krysalis.org)\n");
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
writer.write("%%CreationDate: " + sdf.format(new java.util.Date()) + "\n");
writer.write("%%LanguageLevel: 1\n");
writer.write("%%EndComments\n");
writer.write("%%BeginProlog\n");
writer.write("%%BeginProcSet: barcode4j-procset 1.1\n");
writer.write("/rf {\n"); //rect fill: x y w h rf
writer.write("newpath\n");
writer.write("4 -2 roll moveto\n");
writer.write("dup neg 0 exch rlineto\n");
writer.write("exch 0 rlineto\n");
writer.write("0 neg exch rlineto\n");
writer.write("closepath fill\n");
writer.write("} def\n");
writer.write("/ct {\n"); //centered text: (text) middle-x y ct
writer.write("moveto dup stringwidth\n");
writer.write("2 div neg exch 2 div neg exch\n");
writer.write("rmoveto show\n");
writer.write("} def\n");
writer.write("/rt {\n"); //right-aligned text: (text) x1 x2 y rt
//Calc string width
writer.write("4 -1 roll dup stringwidth pop\n");
//Calc available width (x2-x1)
writer.write("5 -2 roll 1 index sub\n");
//Calc (text-width - avail-width) = diffx
writer.write("3 -1 roll sub\n");
//Calc x = (x1 + diffx)
writer.write("add\n");
//moveto and finally show
writer.write("3 -1 roll moveto show\n");
writer.write("} def\n");
writer.write("/jt {\n"); //justified: (text) x1 x2 y jt
//Calc string width
writer.write("4 -1 roll dup stringwidth pop\n");
//Calc available width (x2-x1)
writer.write("5 -2 roll 1 index sub\n");
//Calc (text-width - avail-width)
writer.write("3 -1 roll sub\n");
//Get string length
writer.write("2 index length\n");
//avail-width / (string-length - 1) = distributable-space
writer.write("1 sub div\n");
//setup moveto and ashow
writer.write("0 4 -1 roll 4 -1 roll 5 -1 roll\n");
writer.write("moveto ashow\n");
writer.write("} def\n");
writer.write("%%EndProcSet: barcode4j-procset 1.0\n");
writer.write("%%EndProlog\n");
}
/**
* Writes the EPS trailer. Must be called after barcode painting call
* returns.
* @throws IOException if an I/O error happened during EPS generation
*/
public void finish() throws IOException {
if (firstError != null) {
throw firstError;
}
writer.write("%%EOF\n");
writer.flush();
}
/** {@inheritDoc} */
public void establishDimensions(BarcodeDimension dim) {
super.establishDimensions(dim);
int orientation = BarcodeDimension.normalizeOrientation(getOrientation());
if (firstError != null) {
return;
}
this.height = dim.getHeightPlusQuiet();
try {
writeHeader(dim.getWidthPlusQuiet(orientation),
dim.getHeightPlusQuiet(orientation));
String w = formatmm(dim.getWidthPlusQuiet());
String h = formatmm(dim.getHeightPlusQuiet());
switch (orientation) {
case 90:
writer.write("90 rotate 0" + " -" + h + " translate\n");
break;
case 180:
writer.write("180 rotate -" + w + " -" + h + " translate\n");
break;
case 270:
writer.write("270 rotate -" + w + " 0 translate\n");
break;
default:
//nop
}
} catch (IOException ioe) {
firstError = ioe;
}
}
/** {@inheritDoc} */
public void deviceFillRect(double x, double y, double w, double h) {
if (firstError != null) {
return;
}
try {
writer.write(formatmm(x, y) + " "
+ formatmm(w) + " " + formatmm(h) + " rf\n");
} catch (IOException ioe) {
firstError = ioe;
}
}
/** {@inheritDoc} */
public void deviceText(
String text,
double x1,
double x2,
double y1,
String fontName,
double fontSize,
TextAlignment textAlign) {
if (firstError != null) {
return;
}
try {
writer.write("/" + fontName + " findfont "
+ UnitConv.mm2pt(fontSize) + " scalefont setfont\n");
if (textAlign == TextAlignment.TA_LEFT) {
writer.write(formatmm(x1, y1) + " moveto (" + text + ") show\n");
} else if (textAlign == TextAlignment.TA_RIGHT) {
writer.write("(" + text + ") "
+ formatmm(x1) + " "
+ formatmm(x2) + " "
+ formatmm(this.height - y1) + " rt\n");
} else if (textAlign == TextAlignment.TA_CENTER) {
writer.write("(" + text + ") "
+ formatmm((x1 + x2) / 2, y1) + " ct\n");
} else if (textAlign == TextAlignment.TA_JUSTIFY) {
writer.write("(" + text + ") "
+ formatmm(x1) + " "
+ formatmm(x2) + " "
+ formatmm(this.height - y1) + " jt\n");
}
} catch (IOException ioe) {
firstError = ioe;
}
}
}