% function lineStyles = linspecer(N)
% This function creates an Nx3 array of N [R B G] colors
% These can be used to plot lots of lines with distinguishable and nice
% looking colors.
%
% lineStyles = linspecer(N); makes N colors for you to use: lineStyles(ii,:)
%
% colormap(linspecer); set your colormap to have easily distinguishable
% colors and a pleasing aesthetic
%
% lineStyles = linspecer(N,'qualitative'); forces the colors to all be distinguishable (up to 12)
% lineStyles = linspecer(N,'sequential'); forces the colors to vary along a spectrum
%
% % Examples demonstrating the colors.
%
% LINE COLORS
% N=6;
% X = linspace(0,pi*3,1000);
% Y = bsxfun(@(x,n)sin(x+2*n*pi/N), X.', 1:N);
% C = linspecer(N);
% axes('NextPlot','replacechildren', 'ColorOrder',C);
% plot(X,Y,'linewidth',5)
% ylim([-1.1 1.1]);
%
% SIMPLER LINE COLOR EXAMPLE
% N = 6; X = linspace(0,pi*3,1000);
% C = linspecer(N)
% hold off;
% for ii=1:N
% Y = sin(X+2*ii*pi/N);
% plot(X,Y,'color',C(ii,:),'linewidth',3);
% hold on;
% end
%
% COLORMAP EXAMPLE
% A = rand(15);
% figure; imagesc(A); % default colormap
% figure; imagesc(A); colormap(linspecer); % linspecer colormap
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% by Jonathan Lansey, March 2009-2013 Lansey at gmail.com %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%% credits and where the function came from
% The colors are largely taken from:
% http://colorbrewer2.org and Cynthia Brewer, Mark Harrower and The Pennsylvania State University
%
%
% She studied this from a phsychometric perspective and crafted the colors
% beautifully.
%
% I made choices from the many there to decide the nicest once for plotting
% lines in Matlab. I also made a small change to one of the colors I
% thought was a bit too bright. In addition some interpolation is going on
% for the sequential line styles.
%
%
%%
function lineStyles=linspecer(N,varargin)
if nargin==0 % return a colormap
lineStyles = linspecer(64);
% temp = [temp{:}];
% lineStyles = reshape(temp,3,255)';
return;
end
if N<=0 % its empty, nothing else to do here
lineStyles=[];
return;
end
% interperet varagin
qualFlag = 0;
if ~isempty(varargin)>0 % you set a parameter?
switch lower(varargin{1})
case {'qualitative','qua'}
if N>12 % go home, you just can't get this.
warning('qualitiative is not possible for greater than 12 items, please reconsider');
else
if N>9
warning(['Default may be nicer for ' num2str(N) ' for clearer colors use: whitebg(''black''); ']);
end
end
qualFlag = 1;
case {'sequential','seq'}
lineStyles = cmap2linspecer(colorm(N));
return;
otherwise
warning(['parameter ''' varargin{1} ''' not recognized']);
end
end
% predefine some colormaps
set3 = colorBrew2mat({[141, 211, 199];[ 255, 237, 111];[ 190, 186, 218];[ 251, 128, 114];[ 128, 177, 211];[ 253, 180, 98];[ 179, 222, 105];[ 188, 128, 189];[ 217, 217, 217];[ 204, 235, 197];[ 252, 205, 229];[ 255, 255, 179]}');
set1JL = brighten(colorBrew2mat({[228, 26, 28];[ 55, 126, 184];[ 77, 175, 74];[ 255, 127, 0];[ 255, 237, 111]*.95;[ 166, 86, 40];[ 247, 129, 191];[ 153, 153, 153];[ 152, 78, 163]}'));
set1 = brighten(colorBrew2mat({[ 55, 126, 184]*.95;[228, 26, 28];[ 77, 175, 74];[ 255, 127, 0];[ 152, 78, 163]}),.8);
set3 = dim(set3,.93);
switch N
case 1
lineStyles = { [ 55, 126, 184]/255};
case {2, 3, 4, 5 }
lineStyles = set1(1:N);
case {6 , 7, 8, 9}
lineStyles = set1JL(1:N)';
case {10, 11, 12}
if qualFlag % force qualitative graphs
lineStyles = set3(1:N)';
else % 10 is a good number to start with the sequential ones.
lineStyles = cmap2linspecer(colorm(N));
end
otherwise % any old case where I need a quick job done.
lineStyles = cmap2linspecer(colorm(N));
end
lineStyles = cell2mat(lineStyles);
end
% extra functions
function varIn = colorBrew2mat(varIn)
for ii=1:length(varIn) % just divide by 255
varIn{ii}=varIn{ii}/255;
end
end
function varIn = brighten(varIn,varargin) % increase the brightness
if isempty(varargin),
frac = .9;
else
frac = varargin{1};
end
for ii=1:length(varIn)
varIn{ii}=varIn{ii}*frac+(1-frac);
end
end
function varIn = dim(varIn,f)
for ii=1:length(varIn)
varIn{ii} = f*varIn{ii};
end
end
function vOut = cmap2linspecer(vIn) % changes the format from a double array to a cell array with the right format
vOut = cell(size(vIn,1),1);
for ii=1:size(vIn,1)
vOut{ii} = vIn(ii,:);
end
end
%%
% colorm returns a colormap which is really good for creating informative
% heatmap style figures.
% No particular color stands out and it doesn't do too badly for colorblind people either.
% It works by interpolating the data from the
% 'spectral' setting on http://colorbrewer2.org/ set to 11 colors
% It is modified a little to make the brightest yellow a little less bright.
function cmap = colorm(varargin)
n = 100;
if ~isempty(varargin)
n = varargin{1};
end
if n==1
cmap = [0.2005 0.5593 0.7380];
return;
end
if n==2
cmap = [0.2005 0.5593 0.7380;
0.9684 0.4799 0.2723];
return;
end
frac=.95; % Slight modification from colorbrewer here to make the yellows in the center just a bit darker
cmapp = [158, 1, 66; 213, 62, 79; 244, 109, 67; 253, 174, 97; 254, 224, 139; 255*frac, 255*frac, 191*frac; 230, 245, 152; 171, 221, 164; 102, 194, 165; 50, 136, 189; 94, 79, 162];
x = linspace(1,n,size(cmapp,1));
xi = 1:n;
cmap = zeros(n,3);
for ii=1:3
cmap(:,ii) = pchip(x,cmapp(:,ii),xi);
end
cmap = flipud(cmap/255);
end