Merge pull request #18 from tlienart/master

Fix for #17

Author: cormullion

src/ColorSchemes.jl

@@ -249,33 +249,17 @@ function sortcolorscheme(colorscheme::Vector{C}, field = :l; kwargs...) where {C
 end
 
 """
-    get(cscheme, x)
 
-Find the nearest color in a colorscheme `cscheme` corresponding to a point `x` between 0 and 1.
+    get(cscheme, inData, rangescale)
 
-Returns a single color.
-"""
-function get(cscheme::Vector{C}, x, rangescale) where {C<:Colorant}
-    if rangescale==:clamp
-        get(cscheme, x, (0.0, 1.0))
-    elseif (rangescale==:extrema)
-        get(cscheme, x, extrema(x))
-    else
-        error("rangescale ($rangescale) not supported, should be :clamp, :extrema or tuple (minVal, maxVal)")
-    end
-end
-
-"""
-
-    get(cscheme, inData :: Array{Number, 2}, rangescale=:clamp)
-    get(cscheme, inData :: Array{Number, 2}, rangescale=(minVal, maxVal))
-
-Return an RGB image generated by applying the colorscheme to the 2D input data.
+Return an RGB image generated by applying the colorscheme to the `inData`.
 
-If `rangescale` is `:clamp` the colorscheme is applied to values between 0.0-1.0, and values
-outside this range get clamped to the ends of the colorscheme.
+If `rangescale` is `:clamp` the colorscheme is applied to values between
+0.0-1.0, and values outside this range get clamped to the ends of the
+colorscheme.
 
-Else, if `rangescale` is `:extrema`, the colorscheme is applied to the range `minimum(indata)..maximum(indata)`.
+Else, if `rangescale` is `:extrema`, the colorscheme is applied to the range
+`minimum(indata)..maximum(indata)`.
 
 # Examples
 
@@ -291,7 +275,17 @@ using PerceptualColourMaps
 img4 = get(PerceptualColourMaps.cmap("R1"), rand(10,10))
 ```
 """
-function get(cscheme::Vector{C}, x, rangescale :: Tuple{Number, Number}=(0.0, 1.0)) where {C<:Colorant}
+function get(cscheme::Vector{<:Colorant},
+             x::Union{<:Real, Array{<:Real}, AbstractRange{<:Real}},
+             rangescale::Union{Symbol, NTuple{2, <:Real}}=(0.0, 1.0))
+
+    # NOTE: the Union type for `x` is needed to avoid ambiguity with Base.get
+    # when using ranges
+
+    rangescale == :clamp   && (rangescale = (0.0, 1.0))
+    rangescale == :extrema && (rangescale = extrema(x))
+    (rangescale isa NTuple{2, Number}) || error("rangescale ($rangescale) not supported, should be :clamp, :extrema or tuple (minVal, maxVal)")
+    x isa AbstractRange && (x = collect(x))
     x = clamp.(x, rangescale...)
     before_fp = remap(x, rangescale..., 1, length(cscheme))
     before = round.(Int, before_fp, RoundDown)

test/runtests.jl

@@ -128,6 +128,18 @@ function run_minimum_tests()
     # test conversion with manually supplied range
     y3=get(ColorSchemes.leonardo, x, (-1.0, 2.0))
     @test y3 == y2
+
+    # test with steplen (#17)
+    r  = range(0, stop=5, length=10)
+    y  = get(ColorSchemes.leonardo, r)
+    y2 = get(ColorSchemes.leonardo, collect(r))
+    @test y == y2
+
+    # test for specific value
+    val = 0.2
+    y   = get(ColorSchemes.leonardo, [val])
+    y2  = get(ColorSchemes.leonardo, val)
+    @test y2 == y[1]
 end
 
 if get(ENV, "COLORSCHEMES_KEEP_TEST_RESULTS", false) == "true"