Examples of generating colors for plots

Sometime we need a set of colors for distinguishing between a group of objects in a plot, or modes, etc. The toolbox has two ways to do this, one using a hue along the colorwheel and one using a colormap.

See also Watermark, AssignColors, ColorSpread, NewFig, PlotColor

Contents

%--------------------------------------------------------------------------
%   Copyright (c) 2017 Princeton Satellite Systems, Inc.
%   All rights reserved.
%--------------------------------------------------------------------------

% Parameters for both examples
n = 20;
th = linspace(0,2*pi,n);

AssignColors from across the RGB spectrum

This function uses hue/saturation/brightness to get a selected number of colors from across the color wheel.

sat = 0.9;
val = 0.9;
colors = AssignColors( n, sat, val );
h = NewFig('AssignColors Demo');
hold on;
for k = 1:n
  plot(th,k*sin(th),'color',colors(k,:)*val);
end
grid on
Watermark('Princeton Satellite Systems',h);

ColorSpread from across a colormap

You can enter a colormap or use the default colormap.

map = copper;
colors = ColorSpread( n, map );
h = NewFig('ColorSpread Demo');
hold on;
for k = 1:n
  plot(th,k*sin(th),'color',colors(k,:));
end
grid on
Watermark('Princeton Satellite Systems',h);


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% $Date$
% $Id: c67ef6befc7521cdea47e6ac0803fbe9ab1b876a $

Published with MATLAB® R2021b