Already fixed in the SVN.
Paulo
On Fri, Oct 12, 2012 at 8:58 PM, Alekz ! <alek...@hotmail.com> wrote:
> Hello all,
>
>
>
> I've been playing around with the LocationTextExtractionStrategy class,
> trying to combine iText text extraction capabilities to build a "Select
> Text" tool (like the one in Acrobat Reader) on a rendered PDF.
>
>
>
> Digging the source code I found 2 things I'd like to share with you, one is
> what I think it's a bug, the other one is more of a question.
>
>
>
> The bug:
>
> LocationTextExtractionStrategy uses TextRenderInfo internally, and this
> class added a new method in v5.3.3: GetCharacterRenderInfos which returns
> info for individual glyphs of a text chunk. This method calls a private
> constructor of TextRenderInfo, which has this body:
>
> private TextRenderInfo(TextRenderInfo parent, int charIndex, float
> horizontalOffset)
> {
>
> this.text = parent.text.Substring(charIndex, charIndex + 1);
> this.textToUserSpaceTransformMatrix = new Matrix(horizontalOffset,
> 0).Multiply(parent.textToUserSpaceTransformMatrix);
>
> this.gs = parent.gs;
>
> this.markedContentInfos = parent.markedContentInfos;
>
> }
>
>
>
> The first line should be parent.text.Substring(charIndex, 1); and I think
> the bug comes from the port of java (I don't know Java, but guess that
> java's substring function uses <startIndex, endIndex> as parameters, while
> the .NET version of substring uses <startIndex, length> as parameters.
>
>
>
> Without this fix I was getting an ArgumentOutOfRange exception: "Index and
> length must refer to a location within the string." when the charIndex
> variable had a value near half the text's length.
>
>
>
> Now, the question/request:
>
> While checking the information obtained by the chunks' TextRenderInfo
> objects, I've seen that the font size returned (at least with the PDF file
> I've been working with) is always 1.0f no matter what chunk I'm parsing. But
> with Adobe I can select text and with the Typewritter tool I can see what
> font/fontsize a chunk uses. For example Arial 20pt.
>
> I came back to iText and found out that the internal variable
> textToUserSpaceTransformMatrix holds a multiplier (?) for the font size, in
> the "d" element (Matrix.I22 constant), so I added a method to the
> TextRenderInfo class, like this:
>
>
>
> public float GetRealFontSize()
>
> {
>
> return gs.GetFontSize() * textToUserSpaceTransformMatrix[Matrix.I22];
>
> }
>
> Is there a better way to get the font size of a glyph without adding this
> custom method?
>
> I need the font size to calculate the user selection when he's using the
> mouse, and the GraphicState (gs) is not accessible from outside iText.
>
>
>
> Thanks for reading! Any tips are very welcome.
>
> Alex
>
>
>
>
>
>
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> 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
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Deploy New Relic app performance management and know exactly
what is happening inside your Ruby, Python, PHP, Java, and .NET app
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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:
http://itextpdf.com/themes/keywords.php
