acrobat - pdf /F font size size is not real size? -

i'm adding text visible signature. text that:

bt 1 0 0 1 0 1 tm  /f1 5 tf (hello world)tj et 

5 font size. how calculated?

i've check width of text it's not same:

affinetransform affinetransform = new affinetransform(); fontrendercontext frc = new fontrendercontext(affinetransform,true,true);      font font = new font("myfont", font.plain, 5); int textwidth = (int)(font.getstringbounds(text, frc).getwidth()); 

in pdrectangle, size 5 big. ideas? how 5 calculated?

@stanlyf quoted how font size meant interpreted. observe the nominal height of lines

you seem have misconception widths. mentioned in my answer former question, widths of string depends on

• the font metrics, character widths of characters involved,
• the font size,
• the current character spacing value,
• the current word spacing value,
• the horizontal scaling,
• the current text matrix, and
• the current transformation matrix.

for details read specification.