Expand of an expand

[cdupont]

Hi,
some artefacts appears when you try to expand an expand.
Try:

myExpand n p = expandTrail' (def & expandJoin .~ LineJoinRound & expandCap .~ LineCapRound) n p

c = arc (0 @@ turn) (0.75 @@ turn)
c2 = c # myExpand 0.2
c3 = (head $ pathTrails c2) # myExpand 0.05

main = mainWith ( (c # stroke # lc green) <> (c2 # stroke # lc red) <> (c3 # stroke # lc blue) # lw 0.01 :: Diagram B R2)

Various artefacts appears if you change the c (with a circle for example) or the parameters for the expand.

[byorgey]

@fryguybob, is this the same as #155? (Edited: whoops, I guess not, I hadn't seen the mailing list message yet: https://groups.google.com/d/msg/diagrams-discuss/64W6FXu_ES0/AATHauYESe8J .)

[fryguybob]

I think this has to do with some nearly zero length segments being generated to join the cubic segments that make up the arc. We should be able to be smarter and avoid generating those small segments, but we do have to be careful that we don't accumulate some error throwing off the end point.

[cdupont]

Hi Brent,
it's not the same: I used the HEAD where #155 is integrated (and the
corresponding bug on a circle disappears).
Cheers,
C

On Fri, Feb 14, 2014 at 6:16 PM, Brent Yorgey notifications@github.comwrote:

@fryguybob https://github.com/fryguybob, is this the same as #155#155
?

Reply to this email directly or view it on GitHubhttps://github.com//issues/160#issuecomment-35104045
.

[byorgey]

Yep, sorry, I replied too soon!