Baseline: the imagenary line on which a text line is placed. A
descender of a character stretches below the
baseline.
Line feed: the vertical distance between the baselines of 2
lines of text. The linefeed is about 1.2 times the
point size (1.33 times the point size for stick fonts).
Point size: the traditional character size measured from the top
of a capital letter to the bottom of a descender.
Cap height: the height measured from the baseline to the top of
a capital letter.
Character origin: the point where the baseline and left edge of the cell
cross each others.
Character width: the horizontal area allotted to a character.
Character cell width: the horizontal distance between the left edge of one
character and the beginning of the next character.
Character cell: a rectangular area defined by the height of a
linefeed and a width extending from the beginning
of one character to the beginning of the next.
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