How to draw random-size circles in square - non overlap?

Question

WinCento99 2019-1-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/441380-how-to-draw-random-size-circles-in-square-non-overlap

回答： Image Analyst 2019-1-25

Hi. i have a question.

How can I change the conditions for the check range and look for a square or rectangle so that the circles do not go out of range? Thanks.

%% https://stackoverflow.com/questions/30822267/how-plot-a-messy-random-size-circles-in-matlab?answertab=active#tab-top
clear ; clc ; clf ;
% set number of circles to plot
n = 50;
radii = zeros(n, 1);
pos = zeros(n, 2);
% allColours = lines(n);
%% main loop
for idx = 1:n
    is_good = false;
    % generate random positions and radii until we have a hit
    while ~is_good
        radii(idx) = (10 + rand*(19-10))/100; % random Radius
        pos(idx, :) = rand(1, 2)*3 + radii(idx); %random Position
        if ((sqrt(sum(pos(idx, :).^2)) + radii(idx) ) < (3*sqrt(2))) ... % ensure we're inside the big circle!!! how can change to another shape????
                && ((idx == 1) || ... %  and either it's the first circle, or??????
                all(sqrt(sum((pos(1:(idx-1), :) - repmat(pos(idx, :), idx-1, 1)).^2, 2)) > radii(1:(idx-1))+radii(idx))) % all distances are bigger than sum of radii of existing circles??????
            is_good = true;
        end
    end
end
%% Generate Area
% figure(2);
clf;
hold on
% set(gca, 'visible', 'off')
daspect([1, 1, 1])
rectangle(...
    'Position',[0 0 3 3],...%     %     'Curvature', [1 1],...% this is for Area
    'FaceColor', 'w',...
    'EdgeColor', [ 0, 0, 0]);
%% generate Circles
for idx = 1:n
    rectangle(...
        'Position',[pos(idx, 1) - radii(idx), pos(idx, 2) - radii(idx), 2*radii(idx), 2*radii(idx)],...
        'Curvature', [1 1],...% this is for shape in Area
        'EdgeColor','k',...
        'FaceColor', 'none');
end