y-axis range not set properly when facet_wrap(scales = "free_y")

[cpsievert]

This is related to the scales="free" bullet of #161, but is probably worth noting separately. I'll send a pull request in attempt to fix both. I've uploaded this plot to demonstrate a bug in the y-axis limits:

library("plotly")
no_panels <- ggplot(mtcars, aes(mpg, wt)) + geom_point()
no_panels + facet_wrap(~am+vs, scales = "free")

On a larger note, the package currently seems a little confused about the conceptual difference between facet_grid and facet_wrap in terms of free scales. For facet_grid, the y-axis/x-axis has to be fixed for a given row/column. But for facet_wrap, each panel is allowed to have it's own axis. I think this figure from the ggplot2 book helps demonstrate that:

@chriddyp @mkcor do you know if the plotly API would support drawing an axis on each panel?

[chriddyp]

hey @cpsievert -- I'm not too familiar with facet_* but Plotly 'panels' can share axes. in fact, plotly's axes are pretty flexible: you control the length of them and the position of them. there are some good simple docs here: https://plot.ly/r/subplots/. The "Multiple Subplots" example seems like facet_wrap and "Subplots with Shared Axes" more similar to facet_grid. Here's another good 3x3 facet_grid example:

[cpsievert]

Nice, just what I was looking for, thanks!

[mkcor]

@cpsievert You are right, the conversion as is doesn't distinguish between facet_grid and facet_wrap in terms of free scales or column/row behaviour.