Hi MetaFun fans,
Following a suggestion of Hans, I experimented with && and &&& and &&&& for
joining paths in MetaFun. The joiner &&& produces one long path, but && and
&&&& seem to produce a disconnected path which includes all the original paths.
However, if one of the paths is a single point, then it connects it. MWE below.
I spotted this on my globes module, where we saw an extra line appear for a
very specific orientation of the globe. I guessed that this orientation had an
island right on the horizon, so that only one boundary point was visible,
creating a singe point path for that island. I should probably fix my module so
it doesn’t do that. However, it might be nice to have && and &&&& deal with
this situation gracefully.
Gavin
\startMPpage
path p[], q ;
p1 = fullcircle scaled 3cm ;
p2 = fullcircle scaled 2cm shifted (3cm,0) ;
p3 = (3cm,2cm) ;
q = for i = 1 upto 3 :
p[i] &&
endfor
cycle ;
draw p1 withpen pencircle scaled 2pt withcolor .7 ;
draw p2 withpen pencircle scaled 2pt withcolor .7 ;
draw p3 withpen pencircle scaled 2pt withcolor .7 ;
draw q withcolor red ;
eofill q withcolor 0.9 ;
draw fullcircle scaled 6cm shifted (1.25cm,0) ;
\stopMPpage
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