TextSize
TextSize Set the point size for subsequent text drawing
#include <Quickdraw.h> Quickdraw
void TextSize(newSize );
short newSize ; size in typo graphical " points"; 0=12- point
TextSize selects the size, in points, for subsequently-drawn text.
newSize is the desired size, in typo graphical points. Values from 1 to 127
are allowed. A value of 0 specifies the system font size (12 points).
Returns: none

Notes: TextSize sets the txSize field of the current GrafPort structure. The
initial value is 0, specifying the system font size (12- point).
If the font used in subsequent text drawing is not available in size points,
the Font Manager will use a font it does have, scaling it to the desired size.
Such "scaled" fonts have a jagged look to them. See SetFScaleDisable for
more information font scaling.
You may use SetFScaleDisable to space text as if it were a different
point size, while continuing to use a “real” (unscaled) font.
To see if an unscaled version of a font exists as a system resource, use
GetFNum to learn its font reference number, then call RealFont.
A typo graphical point is approximately 1/72 of an inch; very nearly the
size of a pixel on the Mac screen.