// ===========================================================================
public void Write(Stream stream)
{
// step 1
using (Document document = new Document()) {
// step 2
PdfWriter writer = PdfWriter.GetInstance(document, stream);
// step 3
document.Open();
// step 4
PdfContentByte cb = writer.DirectContent;
float gap = (document.PageSize.Width - 400) / 3;
PictureBackdrop(gap, 500, cb);
PictureBackdrop(200 + 2 * gap, 500, cb);
PictureBackdrop(gap, 500 - 200 - gap, cb);
PictureBackdrop(200 + 2 * gap, 500 - 200 - gap, cb);
PictureCircles(gap, 500, cb);
cb.SaveState();
PdfGState gs1 = new PdfGState();
gs1.FillOpacity = 0.5f;
cb.SetGState(gs1);
PictureCircles(200 + 2 * gap, 500, cb);
cb.RestoreState();
cb.SaveState();
PdfTemplate tp = cb.CreateTemplate(200, 200);
PdfTransparencyGroup group = new PdfTransparencyGroup();
tp.Group = group;
PictureCircles(0, 0, tp);
cb.SetGState(gs1);
cb.AddTemplate(tp, gap, 500 - 200 - gap);
cb.RestoreState();
cb.SaveState();
tp = cb.CreateTemplate(200, 200);
tp.Group = group;
PdfGState gs2 = new PdfGState();
gs2.FillOpacity = 0.5f;
gs2.BlendMode = PdfGState.BM_HARDLIGHT;
tp.SetGState(gs2);
PictureCircles(0, 0, tp);
cb.AddTemplate(tp, 200 + 2 * gap, 500 - 200 - gap);
cb.RestoreState();
cb.ResetRGBColorFill();
ColumnText ct = new ColumnText(cb);
Phrase ph = new Phrase("Ungrouped objects\nObject opacity = 1.0");
ct.SetSimpleColumn(ph, gap, 0, gap + 200, 500, 18,
Element.ALIGN_CENTER
);
ct.Go();
ph = new Phrase("Ungrouped objects\nObject opacity = 0.5");
ct.SetSimpleColumn(ph, 200 + 2 * gap, 0, 200 + 2 * gap + 200, 500,
18, Element.ALIGN_CENTER
);
ct.Go();
ph = new Phrase(
"Transparency group\nObject opacity = 1.0\nGroup opacity = 0.5\nBlend mode = Normal"
);
ct.SetSimpleColumn(ph, gap, 0, gap + 200, 500 - 200 - gap, 18,
Element.ALIGN_CENTER
);
ct.Go();
ph = new Phrase(
"Transparency group\nObject opacity = 0.5\nGroup opacity = 1.0\nBlend mode = HardLight"
);
ct.SetSimpleColumn(ph, 200 + 2 * gap, 0, 200 + 2 * gap + 200,
500 - 200 - gap, 18, Element.ALIGN_CENTER
);
ct.Go();
}
}