Add a rectangle annotation to a PDF in C++

To add a rectangle annotation to a PDF Document page.

PDFDoc doc(filename);
Page page = doc.GetPage(1);

// Create a rectangle
Square sq = Square::Create( doc, Rect(500,200, 580, 300 ) );
sq.SetColor(ColorPt(1, 0, 0), 3);
sq.SetInteriorColor(ColorPt(0, 1, 1), 3);
std::vector<double> dash( 2 ); dash[0]=4;dash[1]=2;
sq.SetBorderStyle( Annot::BorderStyle( Annot::BorderStyle::e_dashed, 6, 0, 0, dash ) );
sq.SetPadding( 4 );
sq.RefreshAppearance();
page.AnnotPushBack( sq );

Add or edit PDF annotations sample
Full code sample which shows how to add or edit PDF annotations (e.g. hyperlink, intra-document link, stamp, rubber stamp, file attachment, sound, text, free-text, line, circle, square, polygon, polyline, rectangle, squiggly, caret, and ink).