graphics - How colorize Circles in a plot in MATLAB? -


i have matlab code follows:

minval = -1; maxval = 1; maxradius = 0.5; ncircles = 5; dimension = 2; circles = zeros(ncircles, dimension); radius = zeros(ncircles, 1);  = 1 : ncircles circles(i,:) = unifrnd(minval, maxval, [1, dimension]); radius(i) = unifrnd(0, maxradius, 1); end  t = 0 : .1 : 2 * pi;  figure; hold on; = 1 : ncircles x = radius(i) * cos(t) + circles(i,1); y = radius(i) * sin(t) + circles(i,2); plot(x,y); end  axis square; grid on;

the output circle as:

enter image description here

now, want colorize these circles different colors. not solve matter. appreciate contribution simple code.

approach 1: using rectangle, solid colors. circles may covered

the simplest (although not intuitive) way plot circles use rectangle function 'curvature' property set [1 1]. have circles filled, specify color via 'facecolor' property. color of circle border controlled 'edgecolor' property.

since circles colored, may have of them partly or covered other circles.

modified lines in code marked comments.

minval = -1; maxval = 1; maxradius = 0.5; ncircles = 5; dimension = 2; circles = zeros(ncircles, dimension); radius = zeros(ncircles, 1); cmap = hsv(ncircles); %// define colors. change `hsv` `jet`, `cool`, ...  = 1 : ncircles     circles(i,:) = unifrnd(minval, maxval, [1, dimension]);     radius(i) = unifrnd(0, maxradius, 1); end  figure; hold on; = 1 : ncircles     rectangle('curvature', [1 1], ...         'position', [circles(i,:)-radius(i) repmat(2*radius(i),1,2)], ...         'facecolor', cmap(i,:), 'edgecolor', 'none') %// plot filled circle end  axis equal; %// same aspect ratio in both axes grid on;

enter image description here

approach 2: using patch, transparent colors. covered circles visible

to make circles visible if have been covered can use colors transparency (alpha). rectangle not support transparency, have resort patch function. code yours, replacing plot patch , specifying color , transparency appropriate properties.

minval = -1; maxval = 1; maxradius = 0.5; ncircles = 5; dimension = 2; circles = zeros(ncircles, dimension); radius = zeros(ncircles, 1); cmap = hsv(ncircles); %// define colors. change `hsv` `jet`, `cool`, ... alpha = .5; %// define level of transparency  = 1 : ncircles     circles(i,:) = unifrnd(minval, maxval, [1, dimension]);     radius(i) = unifrnd(0, maxradius, 1); end  t = 0 : .1 : 2 * pi;  figure; hold on; = 1 : ncircles     x = radius(i) * cos(t) + circles(i,1);     y = radius(i) * sin(t) + circles(i,2);     patch(x, y, 'none', 'facecolor', cmap(i,:), 'facealpha', alpha, ...         'edgecolor', 'none'); %// plot filled circle transparency end  axis equal; %// same aspect ratio in both axes grid on;

enter image description here


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