wwkloo,
wwkloo wrote
> I am processing PDF of Asian Unicode characters. I need to get the
> bounding boxes for every character inside the PDF.
>
> When I try to extract the bounding box using the following code, I found
> that the box for a non-BMP character (the first Asian character) has zero
> width. However, it is displayed properly in the PDF.
> iTextExtract_W.pdf
> <http://itext-general.2136553.n4.nabble.com/file/n4657896/iTextExtract_W.pdf>
>
I'm afraid that both iText and iTextSharp assume the string in a
TextRenderInfo object to contain only BMP characters when determining the
width of that string. The relevant loop looks like this:
char[] chars = str.ToCharArray();
float totalWidth = 0;
for (int i = 0; i < chars.Length; i++) {
float w = font.GetWidth(chars[i]) / 1000.0f;
float wordSpacing = chars[i] == 32 ? gs.wordSpacing : 0f;
totalWidth += (w * gs.fontSize + gs.characterSpacing + wordSpacing)
* gs.horizontalScaling;
}
Thus, each 16-bit char is considered by itself.
Maybe the code in general should be inspected for such
BMP-character-assumptions.
Regards, Michael
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