@Section
   @Title { "@HScale" and "@VScale" }
   @Tag { hscale }
@Begin
@PP
hscale. @Index { @@HScale symbol }
vscale. @Index { @@VScale symbol }
scaling @Index { Scaling of object }
@@HScale causes its right parameter to expand to fill the space available,
by geometricallly scaling it:
@ID @Code {
"4i @Wide @HScale { 1 2 3 4 5 6 7 8 }"
}
has result
@ID {
4i @Wide @HScale { 1 2 3 4 5 6 7 8 }
}
and
@ID @Code {
"0.5i @Wide @HScale { 1 2 3 4 5 6 7 8 }"
}
has result
@ID {
0.5i @Wide @HScale { 1 2 3 4 5 6 7 8 }
}
@@HScale first applies @@HContract to its parameter, then horizontally
scales it to the actual size.  The principal mark of the right parameter
has no effect on the result; the parameter is scaled to the actual size
and positioned to fill the space available.  (Taking account of alignment
of the principal mark only causes trouble in practice.)
@PP
@@VScale is similar, but in a vertical direction.  @@HScale and @@VScale
each have both a @@OneCol and a @@OneRow effect.
@End @Section