I have a case where the easiest way to draw a particular symbol would be
to draw something a little bigger, and then use polygon(... , col=0) to
erase the extra stuff. Just how to do this best when par('bg') =
'transparent' is, however, eluding me. I've looked through the archives
and the book R Graphics without quite seeing the light.
Help or pointers to help would be welcome.
Terry T
Details (for the inquiring mind). In drawing a pedigree subjects are
depicted as cirle, square, diamond, or triangle (for gender= male,
female, unknown, terminated). This can be subdivided into shaded
regions to show the value of various ancillary variables. One ancillary
is easy - just fill with a color. For two you fill the left and right
half separately, etc. Two, three, four, ... variables become special
cases for each symbol. An easy solution is to draw a larger circle with
the requisite number of shaded slices, then erase away what we don't
want.
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