Java/PDF RTF/GState

GState Demo

import java.awt.Color;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfWriter;
public class GStatePDF {
  public static void main(String[] args) {
    Document document = new Document();
    try {
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("GStatePDF.pdf"));
      document.open();
      PdfContentByte cb = writer.getDirectContent();
      PdfGState gs = new PdfGState();
      gs.setFillOpacity(0.5f);
      cb.setGState(gs);
      cb.setColorFill(Color.red);
      cb.circle(360.0f, 500.0f, 250.0f);
      cb.fill();
      gs.setFillOpacity(0.2f);
      cb.setGState(gs);
      cb.setColorFill(Color.blue);
      cb.circle(460.0f, 500.0f, 100.0f);
      cb.fill();
    } catch (Exception e) {
      System.err.println(e.getMessage());
    }
    document.close();
  }
}