code: public void toPdf(PdfWriter writer, OutputStream os) throws IOException {
          os.write('[');
  
          if (dash >= 0) {
              new PdfNumber(dash).toPdf(writer, os);
              if (gap >= 0) {
                  os.write(' ');
                  new PdfNumber(gap).toPdf(writer, os);
              }
          }
          os.write(']');
          if (phase >=0) {
              os.write(' ');
              new PdfNumber(phase).toPdf(writer, os);
          }
      }
docs: Returns the PDF representation of this <CODE>PdfArray</CODE>.