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GR: rework automatic major/minor ticks for log scales

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This commit is contained in:
t-bltg 2021-07-04 21:58:13 +02:00
parent 7b0066c433
commit ee316e2913
1 changed files with 27 additions and 7 deletions
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30
src/axes.jl
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@ -172,8 +172,9 @@ function optimal_ticks_and_labels(ticks, alims, scale, formatter)
scaled_ticks = optimize_ticks(
sf(amin),
sf(amax);
k_min = 4, # minimum number of ticks
k_min = scale in _logScales ? 2 : 4, # minimum number of ticks
k_max = 8, # maximum number of ticks
scale = scale,
)[1]
elseif typeof(ticks) <: Int
scaled_ticks, viewmin, viewmax = optimize_ticks(
@ -185,6 +186,7 @@ function optimal_ticks_and_labels(ticks, alims, scale, formatter)
# `strict_span = false` rewards cases where the span of the
# chosen ticks is not too much bigger than amin - amax:
strict_span = false,
scale = scale,
)
# axis[:lims] = map(RecipesPipeline.inverse_scale_func(scale), (viewmin, viewmax))
else
@ -336,10 +338,11 @@ function get_minor_ticks(sp, axis, ticks)
length(ticks) < 2 && return nothing
amin, amax = axis_limits(sp, axis[:letter])
scale = axis[:scale]
# Add one phantom tick either side of the ticks to ensure minor ticks extend to the axis limits
if length(ticks) > 2
ratio = (ticks[3] - ticks[2])/(ticks[2] - ticks[1])
elseif axis[:scale] in (:none, :identity)
elseif scale ∈ (:none, :identity)
ratio = 1
else
return nothing
@ -348,13 +351,30 @@ function get_minor_ticks(sp, axis, ticks)
last_step = ticks[end] - ticks[end-1]
ticks = [ticks[1] - first_step/ratio; ticks; ticks[end] + last_step*ratio]
#Default to 5 intervals between major ticks
n = typeof(axis[:minorticks]) <: Integer && axis[:minorticks] > 1 ? axis[:minorticks] : 5
# Default to 9 intervals between major ticks for log10 scale and 5 intervals otherwise.
n_default = (scale === :log10) ? 9 : 5
n = typeof(axis[:minorticks]) <: Integer && axis[:minorticks] > 1 ? axis[:minorticks] : n_default
is_log_scale = scale in _logScales
base = is_log_scale ? _logScaleBases[scale] : nothing
sub = is_log_scale ? round(Int, log(ratio) / log(base)) : nothing
minorticks = typeof(ticks[1])[]
for (i, hi) in enumerate(ticks[2:end])
lo = ticks[i]
if isfinite(lo) && isfinite(hi) && hi > lo
append!(minorticks,collect(lo + (hi-lo)/n :(hi-lo)/n: hi - (hi-lo)/2n))
if is_log_scale
for j in 1:sub
lo_ = lo * base^(j - 1)
hi_ = lo_ * base
step = (hi_ - lo_) / n
append!(minorticks, collect(
lo_ + (j > 1 ? 0 : step) : step : hi_ - (j < sub ? 0 : step / 2)
))
end
else
step = (hi - lo) / n
append!(minorticks, collect(lo + step : step : hi - step / 2))
end
end
end
minorticks[amin .<= minorticks .<= amax]