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How to draw a white circle ?

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K BV
K BV 2012-10-29
Hello,
I would like to draw a white circle in a black square in Matlab but I don't have any idea how to do it. Would you please explain me how to do it ?
In advance, thank you !

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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-29
编辑：Azzi Abdelmalek 2012-10-29
r=4; %radius
x0=0;y0=0; % circle center coordinates
x=x0-r:0.01:x0+r
y=sqrt(r^2-(x-x0).^2)+y0;
fill([x0-r x0+r x0+r x0-r ],[y0-r y0-r y0+r y0+r ],'k')
hold on;
plot(x,y,'w',x,-y,'w');
axis square
axis([x0-2*r x0+2*r y0-2*r y0+2*r]) % facultative
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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-29
Yes
fill([x fliplr(x)],[y fliplr(-y)],'w')
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-29
x=x0-r:0.01:x0+r
is a vector of points we are using to plot your circle

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Image Analyst
Image Analyst 2012-10-30
  1 个评论
K BV
K BV 2012-10-30
Thanks for the link ! I'll search in the FAQs the next time before asking any question ;)

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