How to plot a number of circles with the same radius, but the position of the circles is randomly put
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Beibit Sautbek
il 22 Giu 2016
Commentato: Image Analyst
il 21 Nov 2018
I need to plot a number of circles with the same radius. Number of circles and the radius are input parameters. Also circles are randomly positioned. For example: The program ask user to input the number of the circles, then ask to input the radius of the circle. Here, the radius is the same for all circles. Then by using input parameters program randomly put the circles.
3 Commenti
Walter Roberson
il 24 Giu 2016
Beibit Sautbek comments,
Circles may not overlap. It should separately located
Risposta accettata
KSSV
il 23 Giu 2016
N = 10 ; % number of circles
r = 0.25 ; % radius of circel
%
C = rand(N,2) ;
%
th = linspace(0,2*pi) ;
x = r*cos(th) ;
y = r*sin(th) ;
% Loop for each circle
for i = 1:N
xc = C(i,1)+x ;
yc = C(i,2)+y ;
hold on
plot(xc,yc) ;
end
axis equal
Più risposte (3)
Image Analyst
il 16 Lug 2016
I know you already figured out how to adapt Siva's solution to prevent overlap, because you accepted it, but in case anyone else wants to know how to make a set of non-overlapping circles, see the code below:
numCircles = 1;
numCirclesMax = 50;
radius = 0.05;
maxIterations = 100 * numCirclesMax; % Fail Safe.
iteration = 1;
while numCircles < numCirclesMax && iteration < maxIterations
xTrial = rand;
yTrial = rand;
iteration = iteration + 1; % Fail safe.
% Only need to check for overlap for second and later circles.
if numCircles > 1
% Find distance from other, prior circles.
distances = sqrt((xTrial - x) .^ 2 + (yTrial - y) .^ 2);
if min(distances) < 2 * radius
% It's overlapping at least one of the prior ones
continue; % Skip to end of loop and continue with loop.
end
end
x(numCircles) = xTrial;
y(numCircles) = yTrial;
numCircles = numCircles + 1;
end
radii = radius * ones(1, length(x));
centers = [x', y'];
viscircles(centers, radii);
grid on;
axis equal
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
1 Commento
Walter Roberson
il 23 Giu 2016
2 Commenti
jahanzaib ahmad
il 21 Nov 2018
Modificato: jahanzaib ahmad
il 21 Nov 2018
using the same code i m trying to generate circle of different radius . @is it possible ?
Image Analyst
il 21 Nov 2018
Well, almost the same. Of course you need to generate the random radii. See attached m-file that makes the figure below:
jahanzaib ahmad
il 21 Nov 2018
ONE LAST THING CAN U FIX THEM IN SEMI CIRCLE .. ?
axis([-1.1 1.1 -0.1 1.1]);
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