[Therion] metapost map-connection

[Tarquin Wilton-Jones]

>    thdraw P dashed evenly scaled optical_zoom withcolor (0.4, 0.4, 0.4);


Nice :)
You avoided having to shorten the line by having the end circles bigger 
than the line itself, so you can't see where it overlaps the line. That 
makes it a lot easier.

>    thdraw point infinity of P withpen pencircle scaled 0.4u;
>    thdraw point 0 of P withpen pencircle scaled 0.4u;


I would use thfill there, since you are drawing a circle outline with a 
pen that is fatter than the circle, in order to get the same effect as a 
thfill. It is more readable to use an actual thfill.

But it works so I can't argue.