[BUG] GR guidefontvalign, guidefonthalign do not align the labels

[mmikhasenko]

plot(rand(10), xlab="x (Unt)", ylab="y (Unt)",
    guidefontvalign=:top, guidefonthalign=:right)

The issues seems to be in gr_label_axis function that

Plots.jl/src/backends/gr.jl

Line 1485 in c0824bd

function gr_label_axis(sp, letter, viewport_plotarea)

Versions:

[28b8d3ca] GR v0.55.0 `https://github.com/jheinen/GR.jl.git#master`
[d2c73de3] GR_jll v0.53.0+0
>>>>>
Julia Version 1.5.0
Commit 96786e22cc (2020-08-01 23:44 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-9.0.1 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = "Microsoft VS Code\Code.exe"
  JULIA_NUM_THREADS = 1

[mmikhasenko]

A dirty fix

gr_text(gr_view_xright(viewport_plotarea), viewport_plotarea[3] - h, xaxis[:guide])
gr_text(viewport_plotarea[1] - w, gr_view_yright(viewport_plotarea), yaxis[:guide])

with

gr_view_xright(viewport_plotarea) = viewport_plotarea[1] + 0.9 * (viewport_plotarea[2] - viewport_plotarea[1])
gr_view_yright(viewport_plotarea) = viewport_plotarea[3] + 0.9 * (viewport_plotarea[4] - viewport_plotarea[3])

[mmikhasenko]

A bit more accurate

gr_view_xposition(viewport_plotarea, position) = viewport_plotarea[1] + position * (viewport_plotarea[2] - viewport_plotarea[1])
gr_view_yposition(viewport_plotarea, position) = viewport_plotarea[3] + position * (viewport_plotarea[4] - viewport_plotarea[3])

function position(symb)
    if symb == :top || symb == :right
        return 0.95
    elseif symb == :left || symb == :bottom
        return 0.05
    end
    return 0.5
end

function alignment(symb)
    if symb == :top || symb == :right
        return GR.TEXT_HALIGN_RIGHT
    elseif symb == :left || symb == :bottom
        return GR.TEXT_HALIGN_LEFT
    end
    return GR.TEXT_HALIGN_CENTER
end

[mmikhasenko]

fixed for gr() by #3377 #3390