add horizontal linerange geom

[bbolker]

I believe this is all done (haven't reoxygenized it). As demonstrated in the example, it's useful when coord_flip()+ geom_linerange() is not feasible, e.g. when using facet_wrap().

I'm violating DRY quite a bit here -- it might be better to add an orientation argument to geom_linerange? I'm willing to try that if it's thought to be better, but what's here is reasonably useful as is.

[hadley]

Maybe orient = c("v", "h") would be better in geom_linerange()? I think I'd prefer a parameter than more names. It might be possible to use flip_labels() for a fairly dry implementation?

@lionel- would you be interested in working on again for the other vertical only geoms? This would also involve deprecating geom_errorbarh

[lionel-]

it'd also be great to find a solution for dodging. Maybe the Geoms could have a orient field that Positions could query to do the right thing.

I may work on it again next week but could you be more explicit about what you didn't like in #1128 (besides the repeated code)?

[hadley]

@lionel- just all the duplicated code. I think with an orient parameter and by using flip_labels(), there should be hardly any duplication.

I didn't think about dodging. The easiest approach would probably be an orient param to position_dodge(), and then that could get automatically passed on during layer creation, a la geom_jitter(). I'd prefer to not break encapsulation by allowing geoms & positions to communicate.

[bbolker]

I wasn't aware of #1128, now that I see it it seems to completely supersede what I'm trying to do here (hurrah). Is there any reason not to just close this PR (and if useful/necessary copy some of the relevant discussion back to the #1128 thread) ?

[lionel-]

@bbolker I just uploaded #1265 which implements horizontality through an argument and handles position adjustments. If Hadley is ok with the implementation, I'll try to make the PR as complete as the old one.

[bbolker]

bump. Did this ever happen? I would love to have that functionality ...

[hadley]

I'm not super excited about this (just because it's something I'm unlikely to use) and since you can now create your own geoms outside of ggplot2, I think a package that provided a whole bunch of horizontal geom variants would be reasonable.

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