[BUG] Distorted log-scale heatmap and 2d-hist plots with GR

[oschulz]

With the GR backend (Plots v1.19.1), heatmaps (and so 2D histograms too) are distorted if the axis range spans several decades:

using Plots; gr()

z = rand(Bool, 50, 50)
plot(
    heatmap(z),
    heatmap(10 .^ range(-2, 0, length=50), 10 .^ range-2, 0, length=50), z, scale = :log10),
    heatmap(10 .^ range(-5, 0, length=50), 10 .^ range(-5, 0, length=50), z, scale = :log10),
    heatmap(10 .^ range(0, 5, length=50), 10 .^ range(-5, 0, length=50), z, scale = :log10)
)

results in this plot:

all four sub-plots should look the same (except for the axis scales), but the lower two (with axes spanning 5 decades) are very distorted.

With pyplot

pyplot()

plot(
    heatmap(z),
    heatmap(10 .^ range(-2, 0, length=50), 10 .^ range(-2, 0, length=50), z, scale = :log10),
    heatmap(10 .^ range(-5, 0, length=50), 10 .^ range(-5, 0, length=50), z, scale = :log10),
    heatmap(10 .^ range(0, 5, length=50), 10 .^ range(-5, 0, length=50), z, scale = :log10)
)

everything looks fine:

I'm not sure if this is a Plots or GR bug (CC @jheinen ).

[t-bltg]

Reproducible reduced case:

using Random, Plots

main() = begin
  Random.seed!(1234)
  m, n = 4, 8
  z = rand(Bool, m, n)
  plot(
    heatmap((10.).^range(-2, 0, length=n), (10.).^range(-2, 0, length=m), z, scale=:log10),
    heatmap((10.).^range(-5, 0, length=n), (10.).^range(-5, 0, length=m), z, scale=:log10),
    layout=(2, 1)
  )
  png("hm-$(backend())")
  return
end

gr(); main()
pyplot(); main()

Pyplot

GR

[jheinen]

The problem is fixed in the development branch of GR (see this commit)- a new release will be tagged soon.

[oschulz]

Thanks a lot @jheinen !

[t-bltg]

This issue seems fixed.