xDetails(x, theta)
yDetails(x, theta)"north",
"east", "west", "south".theta
and intersecting it with the convex hull of the grob
(for the basic
grob primitives, the centre is
determined as half way between the minimum and maximum values
in x and y directions). These functions are called in the calculation of
"grobx" and "groby" units as produced by
the grobX and grobY functions.
Methods should be written for classes derived from grob or gTree
where the boundary of the grob can be determined.
grobX,
grobY.