// Creates some text and associate it with the text layer
static Obj CreateGroup3(PDFDoc doc, Obj layer)
{
using (ElementWriter writer = new ElementWriter())
using (ElementBuilder builder = new ElementBuilder())
{
writer.Begin(doc);
// Begin writing a block of text
Element element = builder.CreateTextBegin(Font.Create(doc, Font.StandardType1Font.e_times_roman), 120);
writer.WriteElement(element);
element = builder.CreateTextRun("A text layer!");
// Rotate text 45 degrees, than translate 180 pts horizontally and 100 pts vertically.
Matrix2D transform = Matrix2D.RotationMatrix(-45 * (3.1415 / 180.0));
transform.Concat(1, 0, 0, 1, 180, 100);
element.SetTextMatrix(transform);
writer.WriteElement(element);
writer.WriteElement(builder.CreateTextEnd());
Obj grp_obj = writer.End();
// Indicate that this form (content group) belongs to the given layer (OCG).
grp_obj.PutName("Subtype", "Form");
grp_obj.Put("OC", layer);
grp_obj.PutRect("BBox", 0, 0, 1000, 1000); // Set the clip box for the content.
return(grp_obj);
}
}