iTextSharp.text.pdf.BaseField.GetBorderAppearance C# (CSharp) Метод

        protected PdfAppearance GetBorderAppearance()
        {
            PdfAppearance app = PdfAppearance.CreateAppearance(writer, box.Width, box.Height);
            switch (rotation) {
                case 90:
                    app.SetMatrix(0, 1, -1, 0, box.Height, 0);
                    break;
                case 180:
                    app.SetMatrix(-1, 0, 0, -1, box.Width, box.Height);
                    break;
                case 270:
                    app.SetMatrix(0, -1, 1, 0, 0, box.Width);
                    break;
            }
            app.SaveState();
            // background
            if (backgroundColor != null) {
                app.SetColorFill(backgroundColor);
                app.Rectangle(0, 0, box.Width, box.Height);
                app.Fill();
            }
            // border
            if (borderStyle == PdfBorderDictionary.STYLE_UNDERLINE) {
                if (borderWidth != 0 && borderColor != null) {
                    app.SetColorStroke(borderColor);
                    app.SetLineWidth(borderWidth);
                    app.MoveTo(0, borderWidth / 2);
                    app.LineTo(box.Width, borderWidth / 2);
                    app.Stroke();
                }
            }
            else if (borderStyle == PdfBorderDictionary.STYLE_BEVELED) {
                if (borderWidth != 0 && borderColor != null) {
                    app.SetColorStroke(borderColor);
                    app.SetLineWidth(borderWidth);
                    app.Rectangle(borderWidth / 2, borderWidth / 2, box.Width - borderWidth, box.Height - borderWidth);
                    app.Stroke();
                }
                // beveled
                BaseColor actual = backgroundColor;
                if (actual == null)
                    actual = BaseColor.WHITE;
                app.SetGrayFill(1);
                DrawTopFrame(app);
                app.SetColorFill(actual.Darker());
                DrawBottomFrame(app);
            }
            else if (borderStyle == PdfBorderDictionary.STYLE_INSET) {
                if (borderWidth != 0 && borderColor != null) {
                    app.SetColorStroke(borderColor);
                    app.SetLineWidth(borderWidth);
                    app.Rectangle(borderWidth / 2, borderWidth / 2, box.Width - borderWidth, box.Height - borderWidth);
                    app.Stroke();
                }
                // inset
                app.SetGrayFill(0.5f);
                DrawTopFrame(app);
                app.SetGrayFill(0.75f);
                DrawBottomFrame(app);
            }
            else {
                if (borderWidth != 0 && borderColor != null) {
                    if (borderStyle == PdfBorderDictionary.STYLE_DASHED)
                        app.SetLineDash(3, 0);
                    app.SetColorStroke(borderColor);
                    app.SetLineWidth(borderWidth);
                    app.Rectangle(borderWidth / 2, borderWidth / 2, box.Width - borderWidth, box.Height - borderWidth);
                    app.Stroke();
                    if ((options & COMB) != 0 && maxCharacterLength > 1) {
                        float step = box.Width / maxCharacterLength;
                        float yb = borderWidth / 2;
                        float yt = box.Height - borderWidth / 2;
                        for (int k = 1; k < maxCharacterLength; ++k) {
                            float x = step * k;
                            app.MoveTo(x, yb);
                            app.LineTo(x, yt);
                        }
                        app.Stroke();
                    }
                }
            }
            app.RestoreState();
            return app;
        }