nitialize the context directly. You need to call the <code><a href="Classes/PDFDocument.html#/s:10SwiftyHaru11PDFDocumentC7addPageyAA7PDFPageCyAA14DrawingContextCKXEKF">PDFDocument.addPage(_:)</a></code> method; an instance
of <code>DrawingContext</code> will be passed to the provided closure. That instance is only valid during the lifetime
of that closure.</p>

<p>Each instance of <code>DrawingContext</code> is bound to some <code><a href="Classes/PDFPage.html">PDFPage</a></code>, hence you can use it to p