parsing - How to find PDF line height? -

parsing - How to find PDF line height? -

in adobe portable document format reference 1.3 1 might see

class="lang-none prettyprint-override">th → horizontal spacing txty → move text rendering location respect start of line segment tlm → line matrix tm → text matrix tf → font ts → text rising

and tl operator sets vertical difference between lines in same paragraph. shown adobe portable document format reference manual version 1.3, leading measured unit of line heights (like 1.2 or 1.8 times of current line height).

from can find line height itself?

in pdf parsing tl operator sets vertical difference between lines in same paragraph. shown [adobe portable document format reference manual version 1.3], leading measured unit of line heights (like 1.2 or 1.8 times of current line height).

from can find line height itself?

if @ text on image posted cross-post in itext-general, can read:

so not "unit of line heights 1.2 or 1.8 times of current line height" "unscaled text space units". thus, tl parameter not depending on line height parameter. btw, 0 because automatic advance tl quite seldomly used nowadays.

if need line height nonetheless, have @ font size.

of course of study both leading , font size still subject current transformation matrix , text matrix...

why on earth working such ancient pdf reference? since 2008 pdf specification iso norm, 32000-1.

parsing pdf itextsharp itext