Op 9/01/2013 11:20, fireMatt schreef:
> Hi there, just getting started with itext! Great software.
>
> I have been searching for help with the annotations function. I cant for the
> life of me find the ‘CallOut’ annotation. iText i would have thought would
> have PDF’s callout function somewhere – any tips on how to generate a
> ‘Callout’ would be much appreciated.
>
> There is no 'PdfAnnotation.CreateCallOut' which is where I would expect the
> method to be...
Well, that's because from a theoretical point of view, there's no such
thing as a CallOut annotation.
You are probably referring to a free text annotation with an /IT key
equal to /FreeTextCallout and a CL key defining the callout line:
The /IT value is a name describing the intent of the free text
annotation. The following values shall be valid:
/FreeText — The annotation is intended to function as a plain free-text
annotation. A plain free-text annotation is also known as a text box
comment.
/FreeTextCallout — The annotation is intended to function as a callout.
The callout is associated with an area on the page through the callout
line specified in CL.
/FreeTextTypeWriter — The annotation is intended to function as a
click-to-type or typewriter object and no callout line is drawn.
The /CL value is an array of four or six numbers specifying a callout
line attached to the free text annotation. Six numbers [ x1 y1 x2 y2 x3
y3 ] represent the starting, knee point, and ending coordinates of the
line in default user space. Four numbers [ x1 y1 x2 y2 ] represent the
starting and ending coordinates of the line.
In your case, you need to create a PdfAnnotation dictionary for a free
text annotation, and add two entries to this dictionary. One with the
value PdfName("FreeTextCallout"), another one with a PdfArray value
containing 4 or 6 PdfNumber values.
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