Hi,
here is a quick sample program - hope it helps.
// Load the PDF document created by SimpleForm.java
PDDocument document = PDDocument.load(new
File("target/SimpleForm.pdf"));
PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();
// Get the field and the widget associated to it.
// Note: there might be multiple widgets
PDField field = acroForm.getField("SampleField");
PDAnnotationWidget widget = field.getWidgets().get(0);
// Get the width of the fields box
float widthOfField = widget.getRectangle().getWidth();
// Get the font and the font size setting
// This is currently a little awkward and needs improvement to have a
better API
// for that. In many cases the string will be built like that:
// /Helv 12 Tf 0 g
// We could use PDFStreamParser to do the parsing. For the sample we
split the
// string.
String defaultAppearance = ((PDTextField) field).getDefaultAppearance();
String[] parts = defaultAppearance.split(" ");
// Get the font name
COSName fontName = COSName.getPDFName(parts[0].substring(1));
float fontSize = Float.parseFloat(parts[1]);
// Get the font resource.
// First look up the font from the widgets appearance stream.
// This will be the case if there is already a value.
// If the value hasn't been set yet the font resource needs to be
looked up from
// the AcroForm default resources
PDFont font = null;
PDResources resources = null;
resources = widget.getNormalAppearanceStream().getResources();
if (resources != null)
{
font = resources.getFont(fontName);
}
if (font == null)
{
font = acroForm.getDefaultResources().getFont(fontName);
}
String willFit = "short string";
String willNotFit = "this is a very long string which will not fit the
width of the widget";
// calculate the string width at a certain font size
float willFitWidth = font.getStringWidth(willFit) * fontSize / 1000;
float willNotFitWidth = font.getStringWidth(willNotFit) * fontSize /
1000;
assert willFitWidth < widthOfField;
assert willNotFitWidth > widthOfField;
document.close();
BR
Maruan
> Am 17.06.2016 um 18:03 schrieb Tilman Hausherr <[email protected]>:
>
> Am 16.06.2016 um 23:12 schrieb Barry Neu:
>> Given an earlier reply from Maruan:
>> "you can get the width of a string using PDFont.getStringWidth(String text)"
>
> Yes this is true.
>
>> Is it not true one needs to know the font size to determine the string width?
>
> Yes that too. If you have a size 12 then multiply with 12. And divide by 1000
> (this is only for string widths):
>
> float stringWidth = font.getStringWidth( message )*fontSize/1000f;
>
> (This is from the CreateLandscapePDF example)
>
> If your font is size 12: 2780 * 12 / 1000 / 72 * 2.54 = 1.17cm
>
> To decide whether it will fit in your rectangle, just use
>
> 2780 * 12 / 1000 = 33.36
>
> Sorry that this doesn't really go forward. If you have a PDF and a minimal
> software maybe we can help better.
>
> Tilman
>
>
>> My goal is to determine if a field value will fit in a field at the
>> specified font size on the form.
>> ...
>> //get field size - 1 unit = 1/72 inch
>> float fieldSize = field.getWidgets().get(0).getRectangle().getWidth();
>>
>> //get field value size
>> PDFont font = PDType1Font.HELVETICA;
>> float fieldLength = font.getStringWidth(someValue);
>> ...
>>
>> 1. How can an accurate length be calculated without a Font Size??
>> 2. And, the getStringWidth() method returns a value such as 2780.0 for a 5
>> character field .. what does that number represent?
>
>
>
>> Thanks again.
>>
>>
>>
>>> On Jun 16, 2016, at 2:19 PM, Tilman Hausherr<[email protected]> wrote:
>>>
>>> Am 16.06.2016 um 20:56 schrieb Barry Neu:
>>>> Thank you Tilman.
>>>>
>>>> I was poking around trying to find where to get the Font and Font size for
>>>> a PDTextField but not having any luck.
>>>> Is it in the CosDictionary or what is the proper way to find those 2
>>>> pieces of information?
>>> getDefaultAppearance()
>>>
>>> you would have to parse that.
>>>
>>> I see there's also getDefaultAppearanceString() which is more advanced, but
>>> this isn't public. See the source code of PDDefaultAppearanceString to see
>>> what can be done with that, and make a copy for yourself.
>>>
>>> PDDefaultAppearanceString getDefaultAppearanceString() throws IOException
>>> {
>>> COSString da = (COSString) getInheritableAttribute(COSName.DA);
>>> PDResources dr = getAcroForm().getDefaultResources();
>>> return new PDDefaultAppearanceString(da, dr);
>>> }
>>>
>>>
>>> Tilman
>>>
>>>
>>>> Really appreciate the support.
>>>>
>>>>> On Jun 13, 2016, at 2:51 PM, Tilman Hausherr<[email protected]>
>>>>> wrote:
>>>>>
>>>>> Am 13.06.2016 um 22:36 schrieb Barry Neu:
>>>>>> Thank you for the reply.
>>>>>> I could store meta data about the fields’ capacity as a last resort.
>>>>>> However, there are about 50 different forms to work with and the number
>>>>>> will continue to grow.
>>>>>>
>>>>>> Including Tilman’s reply here:
>>>>>> "Calculate the width of the /Rectangle. 1 unit = 1/72 inch.”
>>>>>>
>>>>>> Are the /Rect coordinates represented in the following order?
>>>>>> Left rectangle boundary, Top, Right, Bottom
>>>>>>
>>>>>> So, 91.095 - 51.855 = 39.24/72s inch wide (or a little over a 1/2 inch)??
>>>>>>
>>>>>> And, how does one get to the /Rect data?
>>>>> Get the widgets of the field
>>>>>
>>>>> PDField.getWidgets(). Usually there is only one (unless you have several
>>>>> widgets, i.e. that the field appears several times in the PDF. So do this
>>>>> call:
>>>>>
>>>>> getWidgets().get(0).getRectangle().getWidth()
>>>>>
>>>>> What is in the PDF shouldn't matter, unless for debugging. I.e. don't try
>>>>> to parse the PDF yourself.
>>>>>
>>>>> I suggest you have a look at the examples in the source download,
>>>>> especially in org.apache.pdfbox.examples.interactive.form.
>>>>>
>>>>> Tilman
>>>>>
>>>>>> I have a debug session open in Eclipse but am not seeing the /Rect data
>>>>>> in ether the PDField or PDAcroForm.
>>>>>>
>>>>>>> On Jun 13, 2016, at 12:32 PM, Aaron Mulder<[email protected]> wrote:
>>>>>>>
>>>>>>> If the form isn't changing, can you just check out the field
>>>>>>> definition in the PDF doc? Here's one from the PDF form I'm working
>>>>>>> with:
>>>>>>>
>>>>>>> << /Type /Annot /T (SlotsTotal 19) /V () /Rect [ 51.855 457.452 91.095
>>>>>>> 478.332
>>>>>>> ] /DV () /FT /Tx /DA (/Helvetica 12 Tf 0 g) /F 4 /MK 1972 0 R /Q 1
>>>>>>> /Subtype
>>>>>>> /Widget >>
>>>>>>>
>>>>>>> The /Rect units aren't in pixels but I assume the text width
>>>>>>> calculation would be the same so it would work out.
>>>>>>>
>>>>>>> My PDF was originally a Linearized mess but I opened it and saved it
>>>>>>> in Preview on OS X and then all the form elements came out in plain
>>>>>>> text which made it easy to inspect in a text editor.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Aaron
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Jun 13, 2016 at 1:32 PM, Barry Neu<[email protected]> wrote:
>>>>>>>> Hello.
>>>>>>>>
>>>>>>>> Is it possible to calculate the pixel width of a text field on a
>>>>>>>> fillable PDF?
>>>>>>>> If so, is there an example available or where can I look to research?
>>>>>>>>
>>>>>>>> Some context:
>>>>>>>> I’m working with PDFBox 2.0.
>>>>>>>> Data for a fillable form is collected in a web user interface. If the
>>>>>>>> value for a given field exceeds the field capacity on the form, the
>>>>>>>> value should be populated on an addendum form. The font size of the
>>>>>>>> field cannot scale down below a particular value.
>>>>>>>>
>>>>>>>> The font and font size are known in advance so the length of the Value
>>>>>>>> can be calculated. But I need to know the pixel capacity of the field
>>>>>>>> to know if the value will “fit”.
>>>>>>>> Also open to an alternate strategy if someone has solved differently.
>>>>>>>>
>>>>>>>> Thanks for any help.
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