parsing - Find Vertical spacing of text lines? -

parsing - Find Vertical spacing of text lines? -

in itext know attributes of text can extracted:

gs → graphics state

word spacing

character spacing

font size

but vertical spacing? example, in ms word 1 sets paragraph spacing {before/after paragraph, line spacing} , these generated resultant pdf. if these vertical spacing info needs recovered analyzing pdf file, there operator 1 should pay attending to?

in adobe portable document format reference 1.3 1 might see

th → horizontal spacing

txty → move text rendering location respect start of line segment

tlm → line matrix

tm → text matrix

tf → font

ts → text rise

but haven't found operator/meta info straight specifies vertical spacing of text. perhaps related how current text line tlm positioned? how location of tlm determined?

parsing pdf itextsharp itext