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### Highlights from Draw a filled circle

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# Draw a filled circle

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Plots a filled circle with given radius, center and color.

File Information
Description

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.

Acknowledgements

Draw A Circle. inspired this file.

This file inspired Circle Plotter and Circlem.

MATLAB release MATLAB 7.10 (R2010a)

Thanks a lot for sharing your cleverness ...

14 Nov 2013 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.

03 Apr 2013 David-Leon

### David-Leon (view profile)

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

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.

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05 Dec 2012 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 ?

11 Mar 2012 Aziz

### Aziz (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.

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24 Jan 2011 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!

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15 Jan 2011 AwedBy Matlab

### AwedBy Matlab (view profile)

Very useful, thank you!

25 Sep 2010 Tima Tima

### Tima Tima (view profile)

Thank you for more simple and more useable code

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