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twilight.m
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twilight.m
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function [map,num] = twilight(N)
% Perceptually uniform cyclic colormap from MatPlotLib.
%
% Copyright (c) 2015 Bastian Bechtold
% Copyright (c) 2017-2022 Stephen Cobeldick
%
%%% Syntax:
% map = twilight
% map = twilight(N)
%
% Colormap designed by Bastian Bechtold.
%
% Cyclic colormaps are designed for plotting data that repeats, therefore the
% colormap loops around (the first and last colors tend to the same color).
%
%% Examples %%
%
%%% Plot the scheme's RGB values:
% rgbplot(twilight(256))
%
%%% New colors for the COLORMAP example:
% load spine
% image(X)
% colormap(twilight)
%
%%% New colors for the SURF example:
% [X,Y,Z] = peaks(30);
% surfc(X,Y,Z)
% colormap(twilight)
% axis([-3,3,-3,3,-10,5])
%
%% Input and Output Arguments %%
%
%%% Inputs (**=default):
% N = NumericScalar, N>=0, an integer to define the colormap length.
% = []**, same length as MATLAB's inbuilt colormap functions.
%
%%% Outputs:
% map = NumericMatrix, size Nx3, a colormap of RGB values between 0 and 1.
%
% See also CIVIDIS INFERNO MAGMA PLASMA TWILIGHT_SHIFTED VIRIDIS
% TAB10 TAB20 TAB20B TAB20C
% BREWERMAP CUBEHELIX MAXDISTCOLOR PARULA LINES COLORMAP SET
if nargin<1 || isnumeric(N)&&isequal(N,[])
N = cmDefaultN();
else
assert(isscalar(N)&&isfinite(N)&&isreal(N),...
'SC:twilight:N:NotRealFiniteScalarNumeric',...
'First argument <N> must be a real finite numeric scalar.')
end
%
raw = 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num = size(raw,1);
%
% Interpolate ensuring that the first & last colors are not the same:
vec = linspace(1,num,N+1);
map = interp1(1:num,raw,vec(1:N),'spline');
%
map = max(0,min(1,map));
%
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%twilight
function N = cmDefaultN()
% Get the colormap size from the current figure or default colormap.
try
F = get(groot,'CurrentFigure');
catch %#ok<CTCH> pre HG2
N = size(get(gcf,'colormap'),1);
return
end
if isempty(F)
N = size(get(groot,'DefaultFigureColormap'),1);
else
N = size(F.Colormap,1);
end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%cmDefaultN