Hello,
Yes, but
the problem is
public
const int RUN_DIRECTION_DEFAULT =0;
This
default value is set to zero here and it's different from
public
const int RUN_DIRECTION_LTR = 2;
public
const int RUN_DIRECTION_RTL = 3;
So by
default, Arabic and Persian texts will not be displayed correctly by using
iTextSharp.
Suppose
we have:
string text ="سلام";
Which
means "hello" in English.
If I
don't specify BaseFont.IDENTITY_H, nothing will be displayed on the page with
iTextSharp.
If I specify BaseFont.IDENTITY_H, "م ا ل س"will be printed, which is wrong ( "س
ل ا م" is the
correct run direction and not its inverse form).
If I warp this text in a container which has run_direction and the
set its run_direction to RUN_DIRECTION_RTL or RUN_DIRECTION_LTR, "سلام"
will be displayed correctly.
So both
of these setting are necessary to display Arabic and Persian texts correctly.
Here are
some tests if you want to see that in action
Test-1 (using default encoding)
using
(var pdfDoc = new Document(PageSize.A4))
{
PdfWriter.GetInstance(pdfDoc, new
FileStream("Test.pdf", FileMode.Create));
pdfDoc.Open();
var chunk = new
Chunk("آزمايش");
pdfDoc.Add(chunk);
}
Its
result is nothing. An empty page.
Test-2 (using BaseFont.IDENTITY_H)
using
(var pdfDoc = new Document(PageSize.A4))
{
PdfWriter.GetInstance(pdfDoc, new
FileStream("Test.pdf", FileMode.Create));
pdfDoc.Open();
var fontPath =
Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\tahoma.ttf";
var baseFont =
BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H,
BaseFont.EMBEDDED);
var tahomaFont = new Font(baseFont, 10,
Font.NORMAL, BaseColor.BLACK);
var chunk = new
Chunk("سلام",tahomaFont);
pdfDoc.Add(chunk);
}
Now it prints something like "م ا ل س"which
is completely wrong. It should be rotated or the correct BIDI processing should
be applied here.
Test-3 (uisng BaseFont.IDENTITY_H &
PdfWriter.RUN_DIRECTION_RTL or LTR and not using RUN_DIRECTION_DEFAULT)
using (var pdfDoc = new
Document(PageSize.A4))
{
var pdfWriter =
PdfWriter.GetInstance(pdfDoc, new FileStream("Test.pdf",
FileMode.Create));
pdfDoc.Open();
var fontPath =
Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\tahoma.ttf";
var baseFont =
BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H,
BaseFont.EMBEDDED);
var tahomaFont = new Font(baseFont, 10,
Font.NORMAL, BaseColor.BLACK);
PdfPTable table = new
PdfPTable(numColumns: 1);
PdfPCell pdfCell = new
PdfPCell(new Phrase("آزمايش", tahomaFont));
pdfCell.RunDirection = PdfWriter.RUN_DIRECTION_RTL; //it should not be
RUN_DIRECTION_DEFAULT
table.AddCell(pdfCell);
pdfDoc.Add(table);
}
Now if I warp that phrase in an element with run_direction and set
its run_dir to RUN_DIRECTION_RTL, "سلام" will be
displayed correctly.
So displaying Arabic and Persian texts correctly without using
elements which have not run_direction is
impossible in iTextSharp. "سلام" (the correct form) is not
equal to "مالس" (the wrong form, result of the RUN_DIRECTION_DEFAULT).
________________________________
From: Paulo Soares <psoa...@glintt.com>
To: Post all your questions about iText here
<itext-questions@lists.sourceforge.net>
Sent: Monday, December 12, 2011 9:06 PM
Subject: Re: [iText-questions] Fwd: Re: XMLWorker & RTL
There's a confusion between run direction and bidi
processing with Arabic shapping. RUN_DIRECTION_RTL and RUN_DIRECTION_LTR will
show Arabic (and Latin) correctly but the former will start the text from the
right and the latter from the left. The text will be correct in both cases,
it's
only a preference depending on the audience.
Paulo
>________________________________
> From: Vahid Nasiri [mailto:vahid_nas...@yahoo.com]
>Sent: Sunday, December 11, 2011 5:37 AM
>To: Post all your questions about iText here
>Subject: Re: [iText-questions] Fwd: Re: XMLWorker & RTL
>
>
>Hello,
>Thanks for your attention, but encoding = BaseFont.IDENTITY_H is mandatory
>for RTL strings otherwise nothing will be displayed on the screen (just an
>empty space) and PdfWriter.RUN_DIRECTION_RTL should be applied too to rotate
>characters. Without PdfWriter.RUN_DIRECTION_RTL you will see "tac" instead of
>"cat". So there is no choice here. It doesn't matter css direction:rtl is set
>or not. Without BaseFont.IDENTITY_H and PdfWriter.RUN_DIRECTION_RTL, the
>result will be nothing or some garbage for RTL data.
>
>
>
>Best regards,
>Vahid
>
>
>
>
>________________________________
> From: Balder VC <li...@redlab.be>
>To: Post all your questions about iText here
><itext-questions@lists.sourceforge.net>
>Sent: Saturday, December 10, 2011 5:20 PM
>Subject: [iText-questions] Fwd: Re: XMLWorker & RTL
>
>
>Seems my previous mail did not get through
>
>-------- Original
Message --------
>Subject: Re: [iText-questions] XMLWorker & RTL
>Date: Sat, 10 Dec 2011 14:30:35 +0100
>From: Balder VC <li...@redlab.be>
>Organisation: redlab.be
>To: itext-questions@lists.sourceforge.net
>
>Hi
>
>Thanks
for bringing that to attention. At the moment rtl is not supported.
>
>I
would not rely on a regex to determine the text direction after all perhaps
some one intend to display it in the other run direction?
>I would opt for
using CSS to set the run direction. Just like in
html
> {
>direction:rtl;
>}
>
>the encoding should be settable
in the same way, we can add an xmlworker specific css property for that.
Forcing .CP1252 is not a good idea, that's right.
>
>
>Thanks for the
idea
>ps: please don't hijack other threads, write a new message for a new
topic, I almost mist this mail.
>
>On 8/12/2011 22:34, Vahid Nasiri wrote:
>Hello,
>>In iTextSharp.tool.xml.css.apply.ChunkCssApplier class, String encoding is
>>hardcoded to BaseFont.CP1252.
>>It's easy to detect right to left languages data:
>>
>> static readonly Regex MatchArabicHebrew = new
>>Regex(@"[\u0600-\u06FF,\u0590-\u05FF]+", RegexOptions.IgnoreCase |
>>RegexOptions.Compiled);
>> public static bool IsRtl(string data)
>> {
>> if (string.IsNullOrEmpty(data)) return false;
>> return MatchArabicHebrew.IsMatch(data);
>> }
>>
>>And then we can improve Apply method of ChunkCssApplier class for instance:
>>
>> public Chunk Apply(Chunk c, Tag t)
>> {
>> String fontName = null;
>> String encoding = BaseFont.CP1252;
>> if (IsRtl(c.Content)) encoding = BaseFont.IDENTITY_H;
>>
>>Also run_direction should be set for PdfPCell and other similar elements to
>>RTL.
>>Ex. iTextSharp.tool.xml.html.table.TableData class
>>
>>public override IList<IElement> End(IWorkerContext ctx, Tag tag,
>>IList<IElement> currentContent) {
>> HtmlCell cell = new HtmlCell();
>> IList<IElement> l = new List<IElement>(1);
>> foreach (IElement e in currentContent) {
>>
>> if(e is Chunk)
>> if (IsRtl(((Chunk)e).Content))
>> {
>> cell.RunDirection = PdfWriter.RUN_DIRECTION_RTL;
>> }
>>
>>
>
>
>--
>twitter
>redlab-log
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Microsoft is holding a special Learn Windows Azure training event for
developers. It will provide a great way to learn Windows Azure and what it
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Learn more at http://p.sf.net/sfu/ms-windowsazure
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
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:
http://itextpdf.com/themes/keywords.php------------------------------------------------------------------------------
Learn Windows Azure Live! Tuesday, Dec 13, 2011
Microsoft is holding a special Learn Windows Azure training event for
developers. It will provide a great way to learn Windows Azure and what it
provides. You can attend the event by watching it streamed LIVE online.
Learn more at http://p.sf.net/sfu/ms-windowsazure
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
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:
http://itextpdf.com/themes/keywords.php
