prepare method

@override void prepare()

Prepare the object to be written to the stream

Implementation

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

  params[PdfNameTokens.functiontype] = const PdfNum(3);
  params[PdfNameTokens.functions] = PdfArray.fromObjects(functions);
  params[PdfNameTokens.order] = const PdfNum(3);
  params[PdfNameTokens.domain] = PdfArray.fromNum(<num>[domainStart, domainEnd]);
  params[PdfNameTokens.bounds] = PdfArray.fromNum(bounds);
  params[PdfNameTokens.encode] = PdfArray.fromNum(
      List<int>.generate(functions.length * 2, (int i) => i % 2));
}