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colorschemes.jl
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colorschemes.jl
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# An abstract color list is either a Palette or a gradient
abstract type AbstractColorList end
get_colorscheme(acl::AbstractColorList) = acl.colors
color_list(acl::AbstractColorList) = color_list(acl.colors)
plot_color(cl::AbstractColorList) = cl
# Interface
Base.show(io::IO, m::MIME"image/svg+xml", acl::AbstractColorList) = show(io, m, color_list(acl))
Base.length(acl::AbstractColorList) = length(color_list(acl))
Base.getindex(acl::AbstractColorList, x) = getindex(color_list(acl), x)
Base.size(acl::AbstractColorList) = size(color_list(acl))
Base.IndexStyle(::Type{<:AbstractColorList}) = IndexLinear()
Base.iterate(acl::AbstractColorList) = iterate(color_list(acl))
Base.iterate(acl::AbstractColorList, s) = iterate(color_list(acl), s)
Base.lastindex(acl::AbstractColorList) = lastindex(color_list(acl))
Base.firstindex(acl::AbstractColorList) = firstindex(color_list(acl))
Base.get(acl::AbstractColorList, args...) = get(get_colorscheme(acl), args...)
## ColorGradient
abstract type ColorGradient <: AbstractColorList end
Base.getindex(cg::ColorGradient, x::Union{AbstractFloat, AbstractVector{<:AbstractFloat}}) =
get(cg, x)
function Base.get(cg::ColorGradient, v::AbstractArray, rangescale = (0.0, 1.0))
rangescale == :extrema && (rangescale = extrema(v))
map(x -> get(cg, x, rangescale), v)
end
Base.:(==)(cg1::ColorGradient, cg2::ColorGradient) = color_list(cg1) == color_list(cg2) && cg1.values == cg2.values
Base.hash(cg::ColorGradient) = hash(color_list(cg)) ⊻ hash(cg.values)
## Continuous Color Gradient
struct ContinuousColorGradient <: ColorGradient
colors::ColorScheme
values::Vector{Float64}
function ContinuousColorGradient(colors, values = get_range(colors))
c, v = prepare_continuous_cgrad_colors(colors, values)
new(c, v)
end
end
plot_color(cg::ContinuousColorGradient, α::Number) =
ContinuousColorGradient(plot_color(cg.colors, α), cg.values)
Base.show(io::IO, m::MIME"image/svg+xml", cg::ContinuousColorGradient) =
show(io, m, cg[get_range(100)])
function Base.get(cg::ContinuousColorGradient, x::AbstractFloat, rangescale = (0.0, 1.0))
isfinite(x) || return invisible()
rangescale = get_rangescale(rangescale)
allunique(rangescale) || return cg.colors[1]
x = clamp(x, rangescale...)
if rangescale != (0.0, 1.0)
x = ColorSchemes.remap(x, rangescale..., 0, 1)
end
c, v = cg.colors, cg.values
if x in v
index = findfirst(==(x), v)
else
xx = x # avoid boxing
i = findlast(t -> t < xx, v)
r = (x - v[i]) / (v[i + 1] - v[i])
index = (i + r - 1) / (length(v) - 1)
end
return c[index]
end
Base.reverse(cg::ContinuousColorGradient) =
ContinuousColorGradient(reverse(cg.colors), reverse(1 .- cg.values))
# required for GR's nonuniformcellarray
function ColorSchemes.getinverse(cg::ContinuousColorGradient, c)
alpha(c) == 0 && return NaN
z = getinverse(to_rgb(get_colorscheme(cg)), to_rgb(c))
cr = get_range(cg.colors)
if z in cr
i = findfirst(==(z), cr)
return cg.values[i]
else
i = findlast(x -> x < z, cr)
ColorSchemes.remap(z, cr[i], cr[i + 1], cg.values[i], cg.values[i + 1])
end
end
function prepare_continuous_cgrad_colors(c, v)
v = sort(unique(clamp.(v, 0, 1)))
0 in v || pushfirst!(v, 0)
1 in v || push!(v, 1)
nv = length(v)
nc = length(c)
c, v = if nc != nv
value_range = get_range(nv)
color_range = get_range(nc)
values = [0.0]
for i in 2:nv
inds = findall(x -> value_range[i - 1] < x < value_range[i], color_range)
if !isempty(inds)
append!(
values,
ColorSchemes.remap(
color_range[inds],
value_range[i - 1],
value_range[i],
v[i - 1],
v[i],
),
)
end
push!(values, v[i])
end
colors = c[sort(unique([value_range; color_range]))]
colors, values
else
color_list(c), v
end
return ColorScheme(plot_color(c)), v
end
## Categorical Color Gradient
struct CategoricalColorGradient <: ColorGradient
colors::ColorScheme
values::Vector{Float64}
function CategoricalColorGradient(colors, values = get_range(colors))
c, v = prepare_categorical_cgrad_colors(colors, values)
new(c, v)
end
end
plot_color(cg::CategoricalColorGradient, α::Number) =
CategoricalColorGradient(plot_color(cg.colors, α), cg.values)
Base.show(io::IO, m::MIME"image/svg+xml", cg::CategoricalColorGradient) =
show(io, m, cg[get_range(100)])
function Base.get(cg::CategoricalColorGradient, x::AbstractFloat, rangescale = (0.0, 1.0))
isfinite(x) || return invisible()
rangescale = get_rangescale(rangescale)
x = clamp.(x, rangescale...)
if rangescale != (0.0, 1.0)
x = ColorSchemes.remap(x, rangescale..., 0, 1)
end
return cg.colors[x == 0 ? 1 : findlast(z -> z < x, cg.values)]
end
Base.reverse(cg::CategoricalColorGradient) =
CategoricalColorGradient(reverse(cg.colors), reverse(1 .- cg.values))
# required for GR's nonuniformcellarray
function ColorSchemes.getinverse(cg::CategoricalColorGradient, c)
alpha(c) == 0 && return NaN
i = findfirst(==(c), color_list(cg))
return (cg.values[i] + cg.values[i + 1]) / 2
end
function prepare_categorical_cgrad_colors(c, v)
v = sort(unique(clamp.(v, 0, 1)))
0 in v || pushfirst!(v, 0)
1 in v || push!(v, 1)
c = ColorScheme(plot_color(c[get_range(length(v) - 1)]))
return c, v
end
## cgrad
"""
cgrad(colors, [values]; categorical = nothing, scale = nothing, rev = false, alpha = nothing)
Construct a Colorgradient with from `colors` and `values`.
`colors` can be a symbol for Colorschemes.jl `ColorScheme`s, a `ColorScheme`, a vectors of colors, a `ColorGradient` or a `ColorPalettes`.
If `values` is an integer, it specifies the numbers of colors chosen equidistantly from the colorscheme specified by colors.
Otherwise vectors are accepted.
For continuous color gradients `values` indicate where between 0 and 1 the colors are positioned.
For categorical color gradients `values` indicate where a color ends and where a new one begins between 0 and 1.
0 and 1 are added to `values` if not already present.
If `rev` is `true` colors are reversed.
`scale` accepts the symbols `:log`, `:log10`, `:log2`, `:ln`, `:exp`, `:exp10` or functions.
If `alpha` is set, it is applied to all colors.
"""
function cgrad(
colors::ColorScheme,
values;
categorical = nothing,
scale = nothing,
rev = false,
alpha = nothing,
)
if categorical !== nothing
colors, values = prepare_categorical_cgrad_colors(colors, values)
end
if alpha !== nothing
rgbs = convert.(RGB, colors.colors)
colors = ColorScheme(RGBA.(rgbs, alpha))
end
if rev
colors = reverse(colors)
end
values = if scale in (:log, :log10) || scale isa typeof(log10)
log10.(ColorSchemes.remap(values, 0, 1, 1, 10))
elseif scale == :log2 || scale isa typeof(log2)
log2.(ColorSchemes.remap(values, 0, 1, 1, 2))
elseif scale == :ln || scale isa typeof(log)
log.(ColorSchemes.remap(values, 0, 1, 1, ℯ))
elseif scale in (:exp, :exp10) || scale isa typeof(exp10) || scale isa typeof(exp)
ColorSchemes.remap(exp10.(values), 1, 10, 0, 1)
elseif scale isa Function
v = scale.(values)
ColorSchemes.remap(v, extrema(v)..., 0, 1)
else
values
end
if categorical !== nothing
return CategoricalColorGradient(colors, values)
else
return ContinuousColorGradient(colors, values)
end
end
function cgrad(colors::ColorScheme, n::Int=length(colors); categorical = nothing, kwargs...)
values = get_range(n + (categorical !== nothing))
return cgrad(colors, values; categorical = categorical, kwargs...)
end
function cgrad(colors, args...; kwargs...)
if colors === :default
colors = :inferno
end
return cgrad(get_colorscheme(colors), args...; kwargs...)
end
cgrad(; kw...) = cgrad(DEFAULT_COLOR_GRADIENT[]; kw...)
function default_cgrad(cg; kw...)
DEFAULT_COLOR_GRADIENT[] = cgrad(cg; kw...)
end
function get_rangescale(rangescale)
rangescale == :clamp && return (0.0, 1.0)
rangescale == :extrema && return extrema(x)
(rangescale isa NTuple{2, Number}) ||
error("rangescale ($rangescale) not supported, should be :clamp, :extrema or tuple (minVal, maxVal). Got $(rangescale).")
return rangescale
end
## ColorPalette
struct ColorPalette <: AbstractColorList
colors::ColorScheme
end
plot_color(cp::ColorPalette, α::Number) = palette(cp, alpha = α)
Base.reverse(cp::ColorPalette) = ColorPalette(reverse(cp.colors))
"""
palette(colors, [n]; rev = false, alpha = nothing)
Construct a `ColorPalette`.
Accepts symbols for Colorschemes.jl `ColorScheme`s, `ColorScheme`s, vectors of colors, `ColorGradient`s and `ColorPalettes`.
If 'n' is provided, `n` colors are chosen equidistantly from the colorscheme.
If `rev` is `true` colors are reversed.
"""
function palette(cs; rev = false, alpha = nothing)
cs = get_colorscheme(cs)
if alpha !== nothing
rgbs = convert.(RGB, cs.colors)
cs = ColorScheme(RGBA.(rgbs, alpha))
end
if rev
cs = reverse(cs)
end
return ColorPalette(cs)
end
function palette(cs, n; kwargs...)
cs = get_colorscheme(cs)
z = get_range(n)
return palette(cs[z]; kwargs...)
end
## Utils
get_range(n::Int) = range(0, stop = 1, length = n)
get_range(cs) = get_range(length(cs))
get_colorscheme(v::AbstractVector{<:Colorant}) = ColorScheme(v)
get_colorscheme(v::AbstractVector) = ColorScheme(parse.(Colorant, v))
function get_colorscheme(sym::Symbol)
if haskey(MISC_COLORSCHEMES, sym)
return MISC_COLORSCHEMES[sym]
end
sym = get(COLORSCHEME_ALIASES, sym, sym)
if sym === :default || sym === :auto
_default_colorscheme
elseif haskey(ColorSchemes.colorschemes, sym)
ColorSchemes.colorschemes[sym]
else
error("Unknown ColorScheme `:$sym`. Check https://juliagraphics.github.io/ColorSchemes.jl/stable/ for available ColorSchemes.")
end
end
get_colorscheme(cs::ColorScheme) = cs
function cvec(cs, n = 10; kw...)
cg = cgrad(cg; kw...)
return RGBA{Float64}[cg[z] for z in get_range(n)]
end
color_list(c) = get_colorscheme(c).colors
color_list(v::AbstractVector) = plot_color.(v)
get_color_palette(v, n) = palette(v)
get_color_palette(cg::ColorGradient, n) = palette(cg[get_zvalues(n)])
to_rgb(c::Colorant) = RGB(c)
to_rgb(cs::ColorScheme) = ColorScheme(to_rgb.(cs.colors))
to_rgb(cg::ColorGradient) = ColorGradient(to_rgb(cg.colors))
to_rgb(cp::ColorPalette) = ColorPalette(to_rgb(cp.colors))
# allows passing a ColorGradient to rgba_string and get a useful response by picking the first color - introduced because the plotly backend to Plots uses this functionality
rgba_string(cg::T) where {T <: Union{ColorScheme, ColorGradient, ColorPalette}} =
rgba_string(cg[1])
is_colorscheme(sym) =
sym in keys(ColorSchemes.colorschemes) ||
sym in keys(COLORSCHEME_ALIASES) || sym in keys(MISC_COLORSCHEMES)
const DEFAULT_COLOR_GRADIENT = Ref(cgrad(ColorSchemes.colorschemes[:inferno]))
## Compat
const COLORSCHEME_ALIASES = Dict{Symbol, Symbol}(
# colorbrewer
:Spectral => :Spectral_11,
:RdYlGn => :RdYlGn_11,
:RdBu => :RdBu_11,
:PiYG => :PiYG_11,
:PRGn => :PRGn_11,
:RdYlBu => :RdYlBu_11,
:BrBG => :BrBG_11,
:RdGy => :RdGy_11,
:Set2 => :Set2_8,
:Accent => :Accent_8,
:Set1 => :Set1_9,
:Set3 => :Set3_12,
:Dark2 => :Dark2_8,
:Paired => :Paired_12,
:Pastel2 => :Pastel2_8,
:Pastel1 => :Pastel1_9,
:PuOr => :PuOr_11,
:OrRd => :OrRd_9,
:PuBu => :PuBu_9,
:BuPu => :BuPu_9,
:Oranges => :Oranges_9,
:BuGn => :BuGn_9,
:YlOrBr => :YlOrBr_9,
:YlGn => :YlGn_9,
:Reds => :Reds_9,
:RdPu => :RdPu_9,
:Greens => :Greens_9,
:YlGnBu => :YlGnBu_9,
:Purples => :Purples_9,
:GnBu => :GnBu_9,
:Greys => :Greys_9,
:YlOrRd => :YlOrRd_8,
:PuRd => :PuRd_9,
:Blues => :Blues_9,
:PuBuGn => :PuBuGn_9,
# colorcet
:bgy => :linear_bgy_10_95_c74_n256,
:bgyw => :linear_bgyw_15_100_c68_n256,
:bjy => :diverging_linear_bjy_30_90_c45_n256,
:bkr => :diverging_bkr_55_10_c35_n256,
:bky => :diverging_bky_60_10_c30_n256,
:blues => :linear_blue_5_95_c73_n256,
:bmw => :linear_bmw_5_95_c86_n256,
:colorwheel => :cyclic_mygbm_30_95_c78_n256_s25,
:dimgreys => :linear_grey_10_95_c0_n256,
:fire => :linear_kryw_0_100_c71_n256,
:greys => :linear_grey_0_100_c0_n256,
:gwv => :diverging_gwv_55_95_c39_n256,
:cinferno => :linear_bmy_10_95_c78_n256,
:isolum => :isoluminant_cgo_80_c38_n256,
:kb => :linear_ternary_blue_0_44_c57_n256,
:kdc => :linear_blue_5_95_c73_n256,
:kg => :linear_ternary_green_0_46_c42_n256,
:kgy => :linear_green_5_95_c69_n256,
:kr => :linear_ternary_red_0_50_c52_n256,
:diverging => :diverging_bwr_40_95_c42_n256,
:cyclic1 => :cyclic_mrybm_35_75_c68_n256,
:cyclic2 => :cyclic_mygbm_30_95_c78_n256,
:cyclic3 => :cyclic_wrwbw_40_90_c42_n256,
)
## Plots misc colorschemes
const RAINBOW_COLORS = RGBA{Float64}[
colorant"purple",
colorant"blue",
colorant"green",
colorant"orange",
colorant"red",
]
const TEST_COLORS = RGBA{Float64}[
colorant"darkblue",
colorant"blueviolet",
colorant"darkcyan",
colorant"green",
darken(colorant"yellow", 0.3),
colorant"orange",
darken(colorant"red", 0.2),
]
const MISC_COLORSCHEMES = Dict{Symbol, ColorScheme}(
:blues => ColorScheme(RGBA{Float64}[colorant"lightblue", colorant"darkblue"]),
:reds => ColorScheme(RGBA{Float64}[colorant"lightpink", colorant"darkred"]),
:greens => ColorScheme(RGBA{Float64}[colorant"lightgreen", colorant"darkgreen"]),
:redsblues => ColorScheme(RGBA{Float64}[
colorant"darkred",
RGB(0.8, 0.85, 0.8),
colorant"darkblue",
]),
:bluesreds => ColorScheme(RGBA{Float64}[
colorant"darkblue",
RGB(0.8, 0.85, 0.8),
colorant"darkred",
]),
:heat => ColorScheme(RGBA{Float64}[
colorant"lightyellow",
colorant"orange",
colorant"darkred",
]),
:grays => ColorScheme(RGBA{Float64}[RGB(0.05, 0.05, 0.05), RGB(0.95, 0.95, 0.95)]),
:rainbow => ColorScheme(RAINBOW_COLORS),
:lightrainbow => ColorScheme(map(lighten, RAINBOW_COLORS)),
:darkrainbow => ColorScheme(map(darken, RAINBOW_COLORS)),
:darktest => ColorScheme(TEST_COLORS),
:lighttest => ColorScheme(map(c -> lighten(c, 0.3), TEST_COLORS)),
:cividis => ColorScheme([
RGB(0.0000, 0.1262, 0.3015),
RGB(0.0000, 0.1292, 0.3077),
RGB(0.0000, 0.1321, 0.3142),
RGB(0.0000, 0.1350, 0.3205),
RGB(0.0000, 0.1379, 0.3269),
RGB(0.0000, 0.1408, 0.3334),
RGB(0.0000, 0.1437, 0.3400),
RGB(0.0000, 0.1465, 0.3467),
RGB(0.0000, 0.1492, 0.3537),
RGB(0.0000, 0.1519, 0.3606),
RGB(0.0000, 0.1546, 0.3676),
RGB(0.0000, 0.1574, 0.3746),
RGB(0.0000, 0.1601, 0.3817),
RGB(0.0000, 0.1629, 0.3888),
RGB(0.0000, 0.1657, 0.3960),
RGB(0.0000, 0.1685, 0.4031),
RGB(0.0000, 0.1714, 0.4102),
RGB(0.0000, 0.1743, 0.4172),
RGB(0.0000, 0.1773, 0.4241),
RGB(0.0000, 0.1798, 0.4307),
RGB(0.0000, 0.1817, 0.4347),
RGB(0.0000, 0.1834, 0.4363),
RGB(0.0000, 0.1852, 0.4368),
RGB(0.0000, 0.1872, 0.4368),
RGB(0.0000, 0.1901, 0.4365),
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