Bar spacing shifting stacked plot off center

[al-labs]

I’m having trouble adding bar spacing to a stacked plot, as it is shifting the bars off center.

dfsample = CSV.read("dfsample.csv", DataFrame) 
    p = plot(dfsample, 
    x=:Percent, 
    y=:LessonName, 
    color=:PassType,  
    Geom.bar(orientation = :horizontal), 
    Theme(  
        #bar_spacing=5mm  
    ) 
)

You can see the plot displays as expected:

However when I add bar_spacing of 5mm it shifts the bars off center (down) from the axis labels:

When I remove the color attribute the bars are spaced and centered correctly:

Any ideas?

[tlnagy]

My guess from looking at it quickly is that the horizontal stacked bar graph (with colors) uses this calculation

Gadfly.jl/src/geom/bar.jl

Line 119 in 72e4b92

y0s = [aes.ymin[i]*cy + theme.bar_spacing/2 for i in idxs]

instead of this one when there are no colors

Gadfly.jl/src/geom/bar.jl

Line 59 in 72e4b92

aes.ymin.*cy .- theme.bar_spacing/2,

So flipping the sign on line 119 might fix this problem.

[al-labs]

That did it! Thank you!!

[tlnagy]

Hey @bjarthur, was this fixed? Because this is a bug on Gadfly's side. I haven't had time to put together a PR yet.