private static void drawColoredPattern(PdfDocument pdf)
{
PdfTilingPattern pattern = pdf.AddColoredPattern(5, 5);
fill(pattern);
PdfCanvas canvas = pdf.GetPage(0).Canvas;
canvas.Brush.Pattern = pattern;
canvas.DrawString(new PointF(50, 50), 0, "Pattern-filled text");
canvas.DrawCircle(new PointF(0, 0), 20, PdfDrawMode.FillAndStroke);
}