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add b->a instance for Alignable #133

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merged 2 commits into from
Oct 24, 2013
Merged

add b->a instance for Alignable #133

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d81b088
add b->a instance for Alignable
Oct 23, 2013
cf655bb
added defaultBoundary instance and explanatory note
Oct 24, 2013
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9 changes: 9 additions & 0 deletions src/Diagrams/Align.hs
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Expand Up @@ -112,6 +112,15 @@ instance ( HasLinearMap v, InnerSpace v, OrderedField (Scalar v)
) => Alignable (QDiagram b v m) where
defaultBoundary = envelopeBoundary

-- | Although the alignBy method for the (b -> a) instance is
-- sensible, there is no good implementation for
-- defaultBoundary. Instead, we provide a total method, but one that
-- is not sensible. This should not present a serious problem as long
-- as your use of Alignable happens through alignBy.
instance (HasOrigin a, Alignable a) => Alignable (b -> a) where
alignBy v d f b = alignBy v d (f b)
defaultBoundary _ _ = origin

-- | @align v@ aligns an enveloped object along the edge in the
-- direction of @v@. That is, it moves the local origin in the
-- direction of @v@ until it is on the edge of the envelope. (Note
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