Do they still make ideal? If so, it might help. ideal draws absolute pictures using primitives.
Ted.Harding wrote: > > On 12-Sep-07 14:12:46, Webb Roberts wrote: >> What is the easiest way to get a Venn diagram in Groff? Pic doesn't >> seem to like overlapping shapes. >> >> Thanks, >> Webb > > It's not clear what you mean by "Pic doesn't like overlapping shapes". > > There is no problem with drawing boundaries for the one-factor regions. > E.g. if you have 3 factors A, B and C you can draw a region for A, a > region for B overlapping the A region, and a third region for C > overlapping all three sub-regions within the first two. > > This then defines 8 sub-regions: abc, Abc, aBc, abC, ABc, AbC, aBC > and ABC, say (where "abc" is outside all the regions you drew), > which you can label with corresponding text. > > However, if you were to try to fill the three regions say with colour > or shades of grey as you draw them, then the last one drawn > (say C) will be entirely the colour or fill that you drew it > with, and this will blot out the subregions for the other > categories -- i.e. abC, AbC, aBC and ABC will all look the same. > Not that irregular shapes can be readily filled in pic anyway. > > The real problem with Venn diagrams arises when you have more > than a few (say 5) factors. It is very difficult indeed (though > not impossible) to invent 5 simply-connected regions each of > which overlaps the others in all possible combinations -- 4 is > bad enough! > > Best wishes, > Ted. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <[EMAIL PROTECTED]> > Fax-to-email: +44 (0)870 094 0861 > Date: 12-Sep-07 Time: 15:44:53 > ------------------------------ XFMail ------------------------------ > > > > -- View this message in context: http://www.nabble.com/Venn-Diagram-in-Pic--tf4429590.html#a12642814 Sent from the Groff - General mailing list archive at Nabble.com.
