File Exchange

image thumbnail

Draw a filled circle

version 1.0.0.0 (2.04 KB) by Sadik

Sadik (view profile)
Plots a filled circle with given radius, center and color.
4.7
10 Ratings

7 Downloads

Updated 23 May 2010

View License

FILLEDCIRCLE Filled circle drawing

filledCircle(CENTER,R,N,COLOR) draws a circle filled with COLOR that has CENTER as its center and R as its radius, by using N points on the periphery.

Usage Examples,

filledCircle([1,3],3,1000,'b');
filledCircle([2,4],2,1000,'r');

If you would like to generate the screenshot image above, you could do this:

filledCircle([1,3],3,100,'k');
hold on
filledCircle([-0.25,4.25],1,100,'r');
filledCircle([2.5,3],1,100,'g');
filledCircle([0.1,1.7],1,100,'b');
axis off

Best.

Cite As

Sadik (2020). Draw a filled circle (https://www.mathworks.com/matlabcentral/fileexchange/27703-draw-a-filled-circle), MATLAB Central File Exchange. Retrieved .

Comments and Ratings (14)

danny hsu

danny hsu (view profile)

Mohammad Rashidi

Mohammad Rashidi (view profile)

Todd LeBlanc

Todd LeBlanc (view profile)

Muhammad Huzaifa

Muhammad Huzaifa (view profile)

Mohammad

Mohammad (view profile)

Thanks a lot for sharing your cleverness ...

Alex R.

Alex R. (view profile)

I know this is old but I wanted to note that it can be done easier and faster as follows:

t = 2*pi/N*(1:N);
fill(c(1)+r*cos(t), c(2)+r*sin(t), color);

Also note that you don't need both 0 and 2pi (they are the same polar point). Your code actually generates N+1 points.

[ depending on N, the above can be substantially faster than using linspace() + ones() + pol2cart() ]

Alex.

David-Leon

David-Leon (view profile)

This addon has a bug (I guess). It changes the aspect ratio of my plot.

Sadik

Sadik (view profile)

Hi Irvin,

I am not sure I understand your question thoroughly but here is what you can do for transparency:

% Filled object becomes more and more transparent as the following variable [transp] goes to zero. [Max value is 1]
transp = 0.5;
set(h,'FaceAlpha',transp);

Best.

irvin rynning

irvin rynning (view profile)

In the code using a white fill
h=fill(X,Y,'w');
results in the same circle with white center.
how to make it transparent ?

Aziz

Aziz (view profile)

Sadik

Sadik (view profile)

Hi Catalin,

You may want to check if you are playing with the axes, especially whether or not the code is making a zooming effect.

If you can't figure that out, using the clf command of matlab, or closing and reopening the figure window at each iteration should solve the problem.

Best.

AwedBy Matlab

AwedBy Matlab (view profile)

Hi Sadik, I am having some problems using filledCircle - the first time I use the function to draw a couple of circles, they are displayed at a certain size, but then the second time (e.g. second iteration of a for loop) they are displayed slightly bigger, even though the function was called with the same RADIUS parameter. Do you know why that might be? Thanks very much!

AwedBy Matlab

AwedBy Matlab (view profile)

Very useful, thank you!

Tima Tima

Tima Tima (view profile)

Thank you for more simple and more useable code

MATLAB Release Compatibility
Created with R2010a
Compatible with any release
Platform Compatibility
Windows macOS Linux
Acknowledgements

Inspired by: Draw a circle.

Inspired: circlem, circle plotter