http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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: FOPProcSet.java 1442711 2013-02-05 19:40:09Z gadams $ */

package org.apache.fop.render.ps;

import java.io.IOException;

import org.apache.xmlgraphics.ps.DSCConstants;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.xmlgraphics.ps.PSProcSet;


Proc Set with FOP-specific procs.

/**
 * Proc Set with FOP-specific procs.
 */
public final class FOPProcSet extends PSProcSet {

    
Singleton instance of the FOP procset 
/** Singleton instance of the FOP procset */
    public static final FOPProcSet INSTANCE = new FOPProcSet();

    private FOPProcSet() {
        super("Apache FOP Std ProcSet", 1.0f, 0);
    }

    
Writes the procset to the PostScript file.

Params:
  • gen – the PS generator
Throws:
/**
     * Writes the procset to the PostScript file.
     * @param gen the PS generator
     * @throws IOException if an I/O error occurs
     */
    public void writeTo(PSGenerator gen) throws IOException {
        gen.writeDSCComment(DSCConstants.BEGIN_RESOURCE,
                new Object[] {TYPE_PROCSET, getName(),
                    Float.toString(getVersion()), Integer.toString(getRevision())});
        gen.writeDSCComment(DSCConstants.VERSION,
                new Object[] {Float.toString(getVersion()), Integer.toString(getRevision())});
        gen.writeDSCComment(DSCConstants.COPYRIGHT, "Copyright 2009 "
                    + "The Apache Software Foundation. "
                    + "License terms: http://www.apache.org/licenses/LICENSE-2.0");
        gen.writeDSCComment(DSCConstants.TITLE,
                "Basic set of procedures used by Apache FOP");


        gen.writeln("/TJ { % Similar but not equal to PDF's TJ operator");
        gen.writeln("  {");
        gen.writeln("    dup type /stringtype eq");
        gen.writeln("    { show }"); //normal text show
        gen.writeln("    {");
        gen.writeln("      dup type /arraytype eq");
        gen.writeln("      { aload pop neg 1000 div exch 1000 div rmoveto }");
        gen.writeln("      { neg 1000 div 0 rmoveto }");
        gen.writeln("      ifelse");
        gen.writeln("    }");
        gen.writeln("    ifelse");
        gen.writeln("  } forall");
        gen.writeln("} bd");

        gen.writeln("/ATJ { % As TJ but adds letter-spacing");
        gen.writeln("  /ATJls exch def");
        gen.writeln("  {");
        gen.writeln("    dup type /stringtype eq");
        gen.writeln("    { ATJls 0 3 2 roll ashow }"); //normal text show
        gen.writeln("    { neg 1000 div 0 rmoveto }"); //negative X movement
        gen.writeln("    ifelse");
        gen.writeln("  } forall");
        gen.writeln("} bd");

        gen.writeDSCComment(DSCConstants.END_RESOURCE);
        gen.getResourceTracker().registerSuppliedResource(this);
    }

}