iTextSharp.text.pdf.RadioCheckField.GetAppearance C# (CSharp) Метод

        public PdfAppearance GetAppearance(bool isRadio, bool on)
        {
            if (isRadio && checkType == TYPE_CIRCLE)
                return GetAppearanceRadioCircle(on);
            PdfAppearance app = GetBorderAppearance();
            if (!on)
                return app;
            BaseFont ufont = RealFont;
            bool borderExtra = borderStyle == PdfBorderDictionary.STYLE_BEVELED || borderStyle == PdfBorderDictionary.STYLE_INSET;
            float h = box.Height - borderWidth * 2;
            float bw2 = borderWidth;
            if (borderExtra) {
                h -= borderWidth * 2;
                bw2 *= 2;
            }
            float offsetX = (borderExtra ? 2 * borderWidth : borderWidth);
            offsetX = Math.Max(offsetX, 1);
            float offX = Math.Min(bw2, offsetX);
            float wt = box.Width - 2 * offX;
            float ht = box.Height - 2 * offX;
            float fsize = fontSize;
            if (fsize == 0) {
                float bw = ufont.GetWidthPoint(text, 1);
                if (bw == 0)
                    fsize = 12;
                else
                    fsize = wt / bw;
                float nfsize = h / (ufont.GetFontDescriptor(BaseFont.ASCENT, 1));
                fsize = Math.Min(fsize, nfsize);
            }
            app.SaveState();
            app.Rectangle(offX, offX, wt, ht);
            app.Clip();
            app.NewPath();
            if (textColor == null)
                app.ResetGrayFill();
            else
                app.SetColorFill(textColor);
            app.BeginText();
            app.SetFontAndSize(ufont, fsize);
            app.SetTextMatrix((box.Width - ufont.GetWidthPoint(text, fsize)) / 2,
                (box.Height - ufont.GetAscentPoint(text, fsize)) / 2);
            app.ShowText(text);
            app.EndText();
            app.RestoreState();
            return app;
        }