element.RunDirection
is defined as an int (unfortunately, I wish it was an enum and we could use the
visual studio's intellisense automatically), so its default value is zero
automatically (RUN_DIRECTION_DEFAULT).
And this
is different from the normal conditions. If I want to construct the document, I
will be responsible for everything. but here XMLWorker tries to accomplish the
job automatically (which is its main purpose).
________________________________
From: Paulo Soares <psoa...@glintt.com>
To: Post all your questions about iText here
<itext-questions@lists.sourceforge.net>
Sent: Tuesday, December 13, 2011 12:46 AM
Subject: Re: [iText-questions] Fwd: Re: XMLWorker & RTL
I know all that, I wrote the Arabic and bidi
support in iText. RUN_DIRECTION_DEFAULT won't work and that's why I didn't
mention it. The run direction can be deduced from the text and there are even
some rules about that based on the directionality strength of the characters.
However, this is something that should be explicitly coded in the CSS as Balder
suggested, as it also involves specific fonts and encoding.
Paulo
----- Original Message -----
>From: Vahid Nasiri
>To: Post all your questions about iText here
>Sent: Monday, December 12, 2011 8:30 PM
>Subject: Re: [iText-questions] Fwd: Re: XMLWorker & RTL
>
>
>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
>>------------------------------------------------------------------------------
>>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
>>
>>
>------------------------------------------------------------------------------
>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
>
>
------------------------------------------------------------------------------
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------------------------------------------------------------------------------
Systems Optimization Self Assessment
Improve efficiency and utilization of IT resources. Drive out cost and
improve service delivery. Take 5 minutes to use this Systems Optimization
Self Assessment. http://www.accelacomm.com/jaw/sdnl/114/51450054/
_______________________________________________
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
