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.
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