blocks|key|1222877|text|您可以使用BaseFont.getWidthPoint(String+text,+float+fontSize)获取字符串的宽度(以pt为单位)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1222878|或者将字符串放入块中并执行chunk.getWidthPoint()|1222879|entityMap^0|5|1F|0|D|L|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

You can use <code>BaseFont.getWidthPoint(String text, float fontSize)</code> to get the width of the string in pt. 

Or put the string in a Chunk and do <code>chunk.getWidthPoint()</code>

blocks|key|1437876|text|被接受的答案BaseFont.getWidthPoint在itext5.5.4中将不起作用，因为该方法不再是静态的。即使它仍然存在，它也不会考虑正在使用的真实字体(它的家族或它的粗体/斜体)，因为它是静态的，并且接收的参数有限。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1437877|chunk.getWidthPoint()确实可以处理后面提到的真正的字体，但对于某些用途来说，不断地创建一个仅用于宽度的块是一种浪费，特别是如果该块不是计划在以后使用的话。|1437878|这是chunk.getWidthPoint()用作独立替代的底层代码，假设您没有进行任何水平缩放：|1437879|font.getCalculatedBaseFont(true).getWidthPoint(text,+font.getCalculatedSize());|code-block|syntax|javascript|1437880|entityMap^0|6|M|0|0|L|0|2|L|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

The accepted answer <code>BaseFont.getWidthPoint</code>, won't work in itext 5.5.4 since the method isn't static anymore. Even if it did still exist, it doesn't take into account the true font being used (its family or its bold/italics) since it's static and is receiving limited parameters.

<code>chunk.getWidthPoint()</code> does work with the true font as later stated, but for certain uses it is a waste to constantly create a chunk just for the width, especially if the chunk isn't planned on being used later.

This is the underlying code for <code>chunk.getWidthPoint()</code> to use as a standalone substitute, assuming you are not doing any horizontal scaling:

<pre><code>font.getCalculatedBaseFont(true).getWidthPoint(text, font.getCalculatedSize());
</code></pre>

blocks|key|1223029|text|我最终用ColumnText.getWidth(+Phrase+phrase+)做了这件事，在用ColumnText.showTextAligned显示Phrase之前，先确定了它的宽度。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1223030|在这段代码中，我使用ColumnText.getWidth调整字符串的长度，将其放在页面的右上角。它可以在肖像A4中工作，还没有进一步测试。|1223031|Phrase+phrase+=+new+Phrase(+"Bla+bla+bla!",+new+Font(+FontFamily.HELVETICA,+9+)+);
float+width+=+ColumnText.getWidth(+phrase+);

ColumnText.showTextAligned+(
++++canvas,
++++Element.ALIGN_LEFT,
++++phrase,
++++canvas.getPdfDocument(+).right(+)+-+width,
++++canvas.getPdfDocument(+).top(+)+%2B+9,
++++0
);|code-block|syntax|javascript|1223032|entityMap|0|LINK|mutability|MUTABLE|url|http://developers.itextpdf.com/reference/com.itextpdf.text.pdf.ColumnText#4f60c4ntmcr|1|http://developers.itextpdf.com/reference/com.itextpdf.text.pdf.ColumnText#6jm6654mc74|2|http://developers.itextpdf.com/reference/com.itextpdf.text.Phrase^0|4|10|1C|Q|24|6|4|10|0|1C|Q|1|24|6|2|0|A|J|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]|$9|18|A|19|1|1A]|$9|1B|A|1C|1|1D]]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]|W|$5|P|Q|R|E|$S|X]]]]

I ended up doing this with <a href="http://developers.itextpdf.com/reference/com.itextpdf.text.pdf.ColumnText#4f60c4ntmcr" rel="nofollow noreferrer"><code>ColumnText.getWidth( Phrase phrase )</code></a> to size what the width of a <a href="http://developers.itextpdf.com/reference/com.itextpdf.text.Phrase" rel="nofollow noreferrer"><code>Phrase</code></a> would be before showing it with <a href="http://developers.itextpdf.com/reference/com.itextpdf.text.pdf.ColumnText#6jm6654mc74" rel="nofollow noreferrer"><code>ColumnText.showTextAligned</code></a>.

In this snippet, I used the <code>ColumnText.getWidth</code> to size the length of a string to place it top right of a page. It works in portrait A4, haven't tested it further.

<pre><code>Phrase phrase = new Phrase( "Bla bla bla!", new Font( FontFamily.HELVETICA, 9 ) );
float width = ColumnText.getWidth( phrase );

ColumnText.showTextAligned (
 canvas,
 Element.ALIGN_LEFT,
 phrase,
 canvas.getPdfDocument( ).right( ) - width,
 canvas.getPdfDocument( ).top( ) + 9,
 0
);
</code></pre>

I am using iText to write a PDF. In some cases, I need to sign the PDF with the <code>SetVisibleSignature</code> function. With this function, we need to designate the rectangle that we will write the content into.

But it's hard for me to calculate how wide the string will be, so that I can set the rectangle before setting a signature on the PDF.

How can I calculate the string width in iText?

How to calculate the string width in iText?

我正在用iText写一个PDF。在某些情况下，我需要使用SetVisibleSignature函数对PDF进行签名。使用此函数，我们需要指定要将内容写入其中的矩形。但是我很难计算字符串的宽度，这样我就可以在PDF上设置签名之前设置矩形。如何在iText中计算字符串宽度？

问如何在iText中计算字符串宽度？
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