The <shape> modifier can contain either a single scale factor, or a pair indicating different factors in the x- and y-directions. Negative values are allowed, to obtain reflections in the coordinate axes, but not zero.
( @@#1@@@#1,#1,@@
@@#1,#2,#3@@@@(#1,#2)@=#1@ @>@ @<@ @@invalid scaling factors #1, #2@=#2@ @>@ @<@ @@invalid scaling factors #1, #2 @
@@(#1,#2)@h@@#1#2@=-#1@-@=-@ #1@- @@-@=-#1#1 =-#1#1 =-#2#2 =-#2#2
@@(#1,#2)@Ignoring rescale: #1,#2@h@@#1#2@
@@@#1#2@scale#1,#2@@ )
2 Some particular scalings.
( @@halfsize@@(.5,.5) @@dblsize@@(2,2) @@flip@@(-1,-1) @@vflip@@(1,-1) @@hflip@@(-1,1) )
3