[iText-questions] Precision Fix
Hi,
We are using iTextSharp to write out pdfs, however there was an issue with
precision.
We enabled ByteBuffer.HIGH_PRECISION, but also needed to make the following
code change to PdfContentBytes.cs
(Basically so we can pass in double precision values).
public void LineTo(float x, float y) {
LineTo((double)x,(double)y);
}
public void LineTo(double x, double y) {
if (inText) {
if (IsTagged()) {
EndText();
} else {
throw new IllegalPdfSyntaxException(
MessageLocalization.GetComposedMessage("path.construction.operator.inside.text.object"));
}
}
content.Append(x).Append(' ').Append(y).Append("
l").Append_i(separator);
}
public void MoveTo(float x, float y) {
MoveTo((double)x,(double)y);
}
public void MoveTo(double x, double y)
{
if (inText)
{
if (IsTagged())
{
EndText();
}
else
{
throw new IllegalPdfSyntaxException(
MessageLocalization.GetComposedMessage("path.construction.operator.inside.text.object"));
}
}
content.Append(x).Append(' ').Append(y).Append("
m").Append_i(separator);
}
If you'd like to apply those changes (and I guess to the other drawing
functions too) that would be great.
Kind Regards
Mark Duffill
Mark Duffill
Programmer
Development Team
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Re: [iText-questions] Precision Fix
Op 8/08/2013 11:42, Mark Duffill schreef:
>
> Hi,
>
> We are using iTextSharp to write out pdfs, however there was an issue
> with precision.
>
> We enabled ByteBuffer.HIGH_PRECISION, but also needed to make the
> following code change to PdfContentBytes.cs
>
> (Basically so we can pass in double precision values).
>
I don't know about iTextSharp, but in iText, the casting is done in the
ByteBuffer class:
/**
* Appends a string representation of a float according
* to the Pdf conventions.
* @param i the float to be appended
* @return a reference to this ByteBuffer object
*/
public ByteBuffer append(float i) {
return append((double)i);
}
This makes your fix unnecessary, doesn't it? I see that the same happens
in iTextSharp:
/**
* Appends a string representation of a float
according
* to the Pdf conventions.
* @param i the float to be appended
* @return a reference to this ByteBuffer object
*/
public ByteBuffer Append(float i) {
return Append((double)i);
}
Why would we need to cast the float value to double values in each
drawing function if the casting is done in ByteBuffer?
Please explain.
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Re: [iText-questions] Precision Fix
Hi,
Yeah I see what you mean, however this is the use case: (pseudo code)
Class point
{
double x;
double y;
};
Foreach point p in points
{
Pcb.LineTo((float)p.x,(float)p.y);
}
When working with very fine detail and accuracy we need to keep the precision.
So basically the issue is iTextSharp does not have overloaded MoveTo/LineTo etc
methods that take doubles, *forcing* us to cast to floats, thus loosing
precision.
Hope this makes sense.
Thanks
Mark
-Original Message-
From: iText Info [mailto:i...@1t3xt.info]
Sent: 08 August 2013 12:13
To: itext-questions@lists.sourceforge.net
Subject: Re: [iText-questions] Precision Fix
Op 8/08/2013 11:42, Mark Duffill schreef:
>
> Hi,
>
> We are using iTextSharp to write out pdfs, however there was an issue
> with precision.
>
> We enabled ByteBuffer.HIGH_PRECISION, but also needed to make the
> following code change to PdfContentBytes.cs
>
> (Basically so we can pass in double precision values).
>
I don't know about iTextSharp, but in iText, the casting is done in the
ByteBuffer class:
/**
* Appends a string representation of a float according
* to the Pdf conventions.
* @param i the float to be appended
* @return a reference to this ByteBuffer object
*/
public ByteBuffer append(float i) {
return append((double)i);
}
This makes your fix unnecessary, doesn't it? I see that the same happens in
iTextSharp:
/**
* Appends a string representation of a float according
* to the Pdf conventions.
* @param i the float to be appended
* @return a reference to this ByteBuffer object
*/
public ByteBuffer Append(float i) {
return Append((double)i);
}
Why would we need to cast the float value to double values in each drawing
function if the casting is done in ByteBuffer?
Please explain.
--
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[iText-questions] I'm having trouble signing pdf in my application.
Hello everybody,
the problem is that the class asks PrivateKeySignature
java.security.RSAPrivatekey as one parameter and returns a
sun.security.mscapi.RSAPrivateKey my provider. So when I try to instantiate
the class an exception is thrown:
SEVERE: null
java.lang.ClassCastException: sun.security.mscapi.RSAPrivateKey cannot be
cast to java.security.interfaces.RSAKey
at
sun.security.pkcs11.P11Signature.engineInitSign(P11Signature.java:384)
at java.security.Signature$Delegate.engineInitSign(Unknown Source)
at java.security.Signature.initSign(Unknown Source)
at
com.itextpdf.text.pdf.security.PrivateKeySignature.sign(PrivateKeySignature.java:114)
at
com.itextpdf.text.pdf.security.MakeSignature.signDetached(MakeSignature.java:150)
==
Meu codigo:
BouncyCastleProvider providerBC = new BouncyCastleProvider();
Security.addProvider(providerBC);
Provider pkcs11Provider = new SunPKCS11(new
ByteArrayInputStream(tokenConfiguration.getBytes()));
Security.addProvider(pkcs11Provider);
KeyStore ks = KeyStore.getInstance("Windows-MY");
ks.load(null, null);
key = (PrivateKey)ks.getKey(alias,password);
chain = ks.getCertificateChain(alias);
OcspClient ocspClient = new OcspClientBouncyCastle();
TSAClient tsaClient = null;
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = (X509Certificate) chain[i];
String tsaUrl = CertificateUtil.getTSAURL(cert);
if (tsaUrl != null) {
tsaClient = new TSAClientBouncyCastle(tsaUrl);
break;
}
}
List crlList = new ArrayList();
crlList.add(new CrlClientOnline(chain));
LoggerFactory.getInstance().setLogger(new SysoLogger());
boolean isOK = false;
PdfReader reader;
try {
filenameforsign = this.temp+filenameforsign;
reader = new PdfReader(filenameforsign);
String arquivoAssinado = filenameforsign.substring(0,
filenameforsign.lastIndexOf(".")) + "_signed.pdf";
FileOutputStream fout = new FileOutputStream(arquivoAssinado);
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
//sap.setCrypto( key, chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
sap.setReason(reason);
sap.setLocation(location);
sap.setCertificate(chain[0]);
sap.setVisibleSignature(new Rectangle(alturaAssinatura,
margemEsquerda, alturaAssinatura-50, margemEsquerda+50),
reader.getNumberOfPages(), null);
//Creating the signature
ExternalDigest digest = new BouncyCastleDigest();
ExternalSignature signature = new PrivateKeySignature( key,
DigestAlgorithms.SHA256, provider);
MakeSignature.signDetached( sap, digest, signature, chain,
crlList, ocspClient, tsaClient , 0, MakeSignature.CryptoStandard.CMS);
stp.close();
isOK = true;
} catch (IOException ex) {
ex.printStackTrace();
System.out.println("Erro de IO");
} catch (DocumentException e) {
e.printStackTrace();
System.out.println("Erro de Documento");
} catch (Exception ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null,
ex);
JOptionPane.showMessageDialog(null, "Falha ao receber
parâmetros."+ex.getMessage(), "ERRO", JOptionPane.INFORMATION_MESSAGE);
}
==
Alguem ja passed why or know how solve the problem?
Hugs.
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iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
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