Concentric circles with different colors

Question

Siddhartha 2018-2-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/382470-concentric-circles-with-different-colors

回答： Pratibha Gangwar 2022-1-24

I'm trying to make concentric circles that have different edge colors like this:

I have made the concentric circles but I only can do it with one unified edge colors for all the circles. How do I specify each one with a different color?

Here is my code so far:

for
i=30:-5:5
rectangle('Position',[-i,-i,2*i,2*i],'Curvature',[1 1],...
  'EdgeColor','y', 'LineWidth',4)
end

Thanks!

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Answer 1

Gayatri Menon 2018-2-16

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Hi,

Instead of using color option for specifying the color, you could use RGB triplets to specify them.You could use rand command to generate random values for RGB triplets in each iteration

rectangle('Position',[-i,-i,2*i,2*i],'Curvature',[1 1],'EdgeColor',rand(1,3), 'LineWidth',4)

Hope the above helps

Thanks

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Answer 2

Jos (10584) 2018-2-16

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You can specify a colormap beforehand:

R = 30:-5:5 ; % radii
N = numel(R) ; % 
Cmap = parula(N) ; % one of the many available maps, see the help
% now loop over the radii and colormaps using indexing
for k = 1:N
    pos = R(k) * [-1 -1 2 2] ;    % position
    clr = Cmap(k,:) ;             % RGB triplet
    rectangle('Position', pos, 'Curvature', [1 1], ... 
              'EdgeColor',clr, 'LineWidth', 4)
end