prepare method

@override void prepare()

Prepare the object to be written to the stream

Implementation

@override
void prepare() {
  super.prepare();

  params['/PatternType'] = PdfNum(patternType);

  if (matrix != null) {
    final s = matrix!.storage;
    params['/Matrix'] = PdfArray.fromNum(<double>[
      s[0],
      s[1],
      s[4],
      s[5],
      s[12],
      s[13],
    ]);
  }
}