/// <summary>Constructs appearance (top-level) for a signature.</summary>
/// <remarks>
/// Constructs appearance (top-level) for a signature.
/// <p>
/// Consult <A HREF="http://partners.adobe.com/asn/developer/pdfs/tn/PPKAppearances.pdf">PPKAppearances.pdf</A>
/// for further details.
/// </remarks>
/// <returns>a top-level signature appearance</returns>
/// <exception cref="System.IO.IOException"/>
protected internal virtual PdfFormXObject GetAppearance()
{
PdfCanvas canvas;
if (IsInvisible())
{
PdfFormXObject appearance = new PdfFormXObject(new Rectangle(0, 0));
appearance.MakeIndirect(document);
return(appearance);
}
if (n0 == null && !reuseAppearance)
{
CreateBlankN0();
}
if (n2 == null)
{
n2 = new PdfFormXObject(rect);
n2.MakeIndirect(document);
String text;
if (layer2Text == null)
{
StringBuilder buf = new StringBuilder();
buf.Append("Digitally signed by ");
String name = null;
CertificateInfo.X500Name x500name = CertificateInfo.GetSubjectFields((X509Certificate)signCertificate);
if (x500name != null)
{
name = x500name.GetField("CN");
if (name == null)
{
name = x500name.GetField("E");
}
}
if (name == null)
{
name = "";
}
buf.Append(name).Append('\n');
buf.Append("Date: ").Append(SignUtils.DateToString(signDate));
if (reason != null)
{
buf.Append('\n').Append(reasonCaption).Append(reason);
}
if (location != null)
{
buf.Append('\n').Append(locationCaption).Append(location);
}
text = buf.ToString();
}
else
{
text = layer2Text;
}
if (image != null)
{
if (imageScale == 0)
{
canvas = new PdfCanvas(n2, document);
canvas.AddImage(image, rect.GetWidth(), 0, 0, rect.GetHeight(), 0, 0);
}
else
{
float usableScale = imageScale;
if (imageScale < 0)
{
usableScale = Math.Min(rect.GetWidth() / image.GetWidth(), rect.GetHeight() / image.GetHeight());
}
float w = image.GetWidth() * usableScale;
float h = image.GetHeight() * usableScale;
float x = (rect.GetWidth() - w) / 2;
float y = (rect.GetHeight() - h) / 2;
canvas = new PdfCanvas(n2, document);
canvas.AddImage(image, w, 0, 0, h, x, y);
}
}
PdfFont font;
if (layer2Font == null)
{
font = PdfFontFactory.CreateFont();
}
else
{
font = layer2Font;
}
float size = layer2FontSize;
Rectangle dataRect = null;
Rectangle signatureRect = null;
if (renderingMode == PdfSignatureAppearance.RenderingMode.NAME_AND_DESCRIPTION || renderingMode == PdfSignatureAppearance.RenderingMode
.GRAPHIC_AND_DESCRIPTION && this.signatureGraphic != null)
{
if (rect.GetHeight() > rect.GetWidth())
{
signatureRect = new Rectangle(MARGIN, rect.GetHeight() / 2, rect.GetWidth() - 2 * MARGIN, rect.GetHeight()
/ 2);
dataRect = new Rectangle(MARGIN, MARGIN, rect.GetWidth() - 2 * MARGIN, rect.GetHeight() / 2 - 2 * MARGIN);
}
else
{
// origin is the bottom-left
signatureRect = new Rectangle(MARGIN, MARGIN, rect.GetWidth() / 2 - 2 * MARGIN, rect.GetHeight() - 2 * MARGIN
);
dataRect = new Rectangle(rect.GetWidth() / 2 + MARGIN / 2, MARGIN, rect.GetWidth() / 2 - MARGIN, rect.GetHeight
() - 2 * MARGIN);
}
}
else
{
if (renderingMode == PdfSignatureAppearance.RenderingMode.GRAPHIC)
{
if (signatureGraphic == null)
{
throw new InvalidOperationException();
}
/*MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.only")*/
signatureRect = new Rectangle(MARGIN, MARGIN, rect.GetWidth() - 2 * MARGIN, rect.GetHeight() - 2 * MARGIN);
}
else
{
// take all space available
dataRect = new Rectangle(MARGIN, MARGIN, rect.GetWidth() - 2 * MARGIN, rect.GetHeight() * (1 - TOP_SECTION
) - 2 * MARGIN);
}
}
switch (renderingMode)
{
case PdfSignatureAppearance.RenderingMode.NAME_AND_DESCRIPTION: {
String signedBy = CertificateInfo.GetSubjectFields((X509Certificate)signCertificate).GetField("CN");
if (signedBy == null)
{
signedBy = CertificateInfo.GetSubjectFields((X509Certificate)signCertificate).GetField("E");
}
if (signedBy == null)
{
signedBy = "";
}
canvas = new PdfCanvas(n2, document);
Paragraph paragraph = new Paragraph(signedBy).SetFont(font).SetFontSize(layer2FontSize).SetMargin(0).SetMultipliedLeading
(0.9f);
new iText.Layout.Canvas(canvas, document, signatureRect).Add(paragraph);
break;
}
case PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION: {
if (signatureGraphic == null)
{
throw new InvalidOperationException();
}
/*MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.and.description")*/
float imgWidth = signatureGraphic.GetWidth();
if (imgWidth == 0)
{
imgWidth = signatureRect.GetWidth();
}
float imgHeight = signatureGraphic.GetHeight();
if (imgHeight == 0)
{
imgHeight = signatureRect.GetHeight();
}
float multiplierH = signatureRect.GetWidth() / signatureGraphic.GetWidth();
float multiplierW = signatureRect.GetHeight() / signatureGraphic.GetHeight();
float multiplier = Math.Min(multiplierH, multiplierW);
imgWidth *= multiplier;
imgHeight *= multiplier;
float x = signatureRect.GetRight() - imgWidth;
float y = signatureRect.GetBottom() + (signatureRect.GetHeight() - imgHeight) / 2;
canvas = new PdfCanvas(n2, document);
canvas.AddImage(signatureGraphic, imgWidth, 0, 0, imgHeight, x, y);
break;
}
case PdfSignatureAppearance.RenderingMode.GRAPHIC: {
float imgWidth_1 = signatureGraphic.GetWidth();
if (imgWidth_1 == 0)
{
imgWidth_1 = signatureRect.GetWidth();
}
float imgHeight_1 = signatureGraphic.GetHeight();
if (imgHeight_1 == 0)
{
imgHeight_1 = signatureRect.GetHeight();
}
float multiplierH_1 = signatureRect.GetWidth() / signatureGraphic.GetWidth();
float multiplierW_1 = signatureRect.GetHeight() / signatureGraphic.GetHeight();
float multiplier_1 = Math.Min(multiplierH_1, multiplierW_1);
imgWidth_1 *= multiplier_1;
imgHeight_1 *= multiplier_1;
float x_1 = signatureRect.GetLeft() + (signatureRect.GetWidth() - imgWidth_1) / 2;
float y_1 = signatureRect.GetBottom() + (signatureRect.GetHeight() - imgHeight_1) / 2;
canvas = new PdfCanvas(n2, document);
canvas.AddImage(signatureGraphic, imgWidth_1, 0, 0, imgHeight_1, x_1, y_1);
break;
}
}
if (renderingMode != PdfSignatureAppearance.RenderingMode.GRAPHIC)
{
canvas = new PdfCanvas(n2, document);
Paragraph paragraph_1 = new Paragraph(text).SetFont(font).SetFontSize(layer2FontSize).SetMargin(0).SetMultipliedLeading
(0.9f);
new iText.Layout.Canvas(canvas, document, dataRect).Add(paragraph_1);
}
}
int rotation = document.GetPage(page).GetRotation();
Rectangle rotated = new Rectangle(rect);
if (topLayer == null)
{
topLayer = new PdfFormXObject(rotated);
topLayer.MakeIndirect(document);
float scale = Math.Min(rect.GetWidth(), rect.GetHeight()) * 0.9f;
float x = (rect.GetWidth() - scale) / 2;
float y = (rect.GetHeight() - scale) / 2;
scale /= 100;
canvas = new PdfCanvas(topLayer, document);
if (rotation == 90)
{
canvas.ConcatMatrix(0, 1, -1, 0, rect.GetHeight(), 0);
}
else
{
if (rotation == 180)
{
canvas.ConcatMatrix(-1, 0, 0, -1, rect.GetWidth(), rect.GetHeight());
}
else
{
if (rotation == 270)
{
canvas.ConcatMatrix(0, -1, 1, 0, 0, rect.GetWidth());
}
}
}
if (reuseAppearance)
{
PdfAcroForm acroForm = PdfAcroForm.GetAcroForm(document, true);
PdfFormField field = acroForm.GetField(fieldName);
PdfStream stream = field.GetWidgets()[0].GetAppearanceDictionary().GetAsStream(PdfName.N);
PdfFormXObject xobj = new PdfFormXObject(stream);
if (stream != null)
{
topLayer.GetResources().AddForm(xobj, new PdfName("n0"));
PdfCanvas canvas1 = new PdfCanvas(topLayer, document);
canvas1.AddXObject(xobj, 1, 0, 0, 1, 0, 0);
}
else
{
reuseAppearance = false;
if (n0 == null)
{
CreateBlankN0();
}
}
}
if (!reuseAppearance)
{
topLayer.GetResources().AddForm(n0, new PdfName("n0"));
PdfCanvas canvas1 = new PdfCanvas(topLayer, document);
canvas1.AddXObject(n0, 1, 0, 0, 1, 0, 0);
}
topLayer.GetResources().AddForm(n2, new PdfName("n2"));
PdfCanvas canvas1_1 = new PdfCanvas(topLayer, document);
canvas1_1.AddXObject(n2, 1, 0, 0, 1, 0, 0);
}
PdfFormXObject napp = new PdfFormXObject(rotated);
napp.MakeIndirect(document);
napp.GetResources().AddForm(topLayer, new PdfName("FRM"));
canvas = new PdfCanvas(napp, document);
canvas.AddXObject(topLayer, 0, 0);
return(napp);
}