PDFlib で、はめ込む部分のテキストを前もって切り抜いておくノックアウトの代わりに、他のページのコンテンツを重ね合わせるテキストを作成するサンプルプログラムです。
/*
* Overprinting text:
* Create text which will overprint other page contents instead of knocking
* it out
*
* Create an extended graphics state with the options
* "overprintfill=true overprintmode=1".
*
* Required software: PDFlib/PDFlib+PDI/PPS 9
* Required data: none
*/
package com.pdflib.cookbook.pdflib.graphics;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class overprinting_text {
public static void main(String argv[]) {
/* This is where the data files are. Adjust as necessary. */
String searchpath = "../input";
String outfile = "overprinting_text.pdf";
String title = "Overprinting Text";
int exitcode = 0;
pdflib p = null;
try {
p = new pdflib();
p.set_option("searchpath={" + searchpath + "}");
/* This means we must check return values of load_font() etc. */
p.set_option("errorpolicy=return");
if (p.begin_document(outfile, "") == -1)
throw new Exception("Error: " + p.get_errmsg());
p.set_info("Creator", "PDFlib Cookbook");
p.set_info("Title", title);
/* Load the font. */
int font = p.load_font("Helvetica-Bold", "unicode", "");
if (font == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Start page */
p.begin_page_ext(400, 300, "");
/* Draw a red background rectangle */
p.setcolor("fill", "cmyk", 0, 1, 1, 0);
p.rect(0, 0, 400, 300);
p.fill();
/* Save the current graphics state */
p.save();
/* Create an extended graphics state */
int gstate = p.create_gstate("overprintfill overprintmode=1");
/* Apply the extended graphics state */
p.set_gstate(gstate);
/*
* Show some text which will overprint other page contents according
* to the graphics state set
*/
String fontopts = "font=" + font + " fontsize=36";
p.setcolor("fill", "cmyk", 0, 0, 0, 1);
p.fit_textline("overprinting text", 20, 200, fontopts);
/* Restore the current graphics state */
p.restore();
/*
* Show some text. It will not be overprinting since the old
* graphics state has been restored with no overprinting set.
*/
p.setcolor("fill", "cmyk", 0, 0, 0, 1);
p.fit_textline("text not overprinting", 20, 100, fontopts);
p.end_page_ext("");
p.end_document("");
}
catch (PDFlibException e) {
System.err.println("PDFlib exception occurred:");
System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
": " + e.get_errmsg());
exitcode = 1;
}
catch (Exception e) {
System.err.println(e);
exitcode = 1;
}
finally {
if (p != null) {
p.delete();
}
System.exit(exitcode);
}
}
}