How to plot (n) circles with known center and radius

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Abdul Hamed Hatem 2020-7-4

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评论： Abdul Hamed Hatem 2020-7-4

Hi,

I need to generat a plot of (n) circles. The radius of the circles is known and equals to 15m. The circles centers are separated by azimuthal angle equal to 10 degrees and they are located on the perimiter of biggr circle that it is radius is 120m.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

theta=10 % azimuthal distance between the centers of circles group

r=120 % The radius of the big circle

DM=12 % The radius of the group of circles

for i=1:38 % number of circles

x1(i)= r*cosd(90-(i-1)*theta); % the x comoenets of the circle group

y1(i)=r*sind(90-(i-1)*theta); % The y component of the circle group

end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Would please advise.

Best Regards,

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Answer 1

Image Analyst 2020-7-4

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在 MATLAB Online 中打开

If you have the Image Processing Toolbox, use viscircles(centers, radii):

theta=10 % azimuthal distance between the centers of circles group
r=120 % The radius of the big circle
DM=12  % The radius of the group of circles
numCircles = 38;
for k = 1 : numCircles  % number of circles
	xCenter(k) = r * cosd(90-(k-1)*theta); % the x comoenets of the circle group
	yCenter(k) = r * sind(90-(k-1)*theta); % The y component of the circle group
end
plot(xCenter, yCenter, 'b.');
grid on;
viscircles([xCenter(:),yCenter(:)], 15 * ones(numCircles, 1));
axis square

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Abdul Hamed Hatem 2020-7-4

Many Thanks,

That is exactly what I want.

Regards,

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Answer 2

Rafael Hernandez-Walls 2020-7-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/559385-how-to-plot-n-circles-with-known-center-and-radius#answer_460886

在 MATLAB Online 中打开

I don't know is you want this:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
theta=10 % azimuthal distance between the centers of circles group 
r=120; % The radius of the big circle 
DM=15;  % The radius of the group of circles 
i=1:38;
x1= r*cosd(90-(i-1)*theta); % the x component of the circle group
y1= r*sind(90-(i-1)*theta); % The y component of the circle group 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
plot(x1,y1),axis equal
hold on
n=38;
for k=1:n
    x=x1(k)+DM*cos([0:pi/16:2*pi]);
    y=y1(k)+DM*sin([0:pi/16:2*pi]);
    plot(x,y);
    drawnow
end