plotting circles

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Yasmin Tamimi 2011-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/3058-plotting-circles

评论： Michelle Hirsch 2023-12-11

How can I plot circles, same radius and different centers, all in one graph. I used the following command to draw +,o,diamond: plot (x,y,'ro',u,v,'gd',A,B,'b+'); where x,y,u,v,A,B are all row vectors. And I want to add circles to that plot where the o will be the center.

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fatima ibrahim 2020-2-29

function draw_circle1(x,y,R,c)

t =0:0.05:6.28;

x1 = (x +R*cos(t))';

y1= (x +R*sin(t))';

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采纳的回答

Paulo Silva 2011-3-12

15
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Here's a function to draw circles:

function circle(x,y,r)
%x and y are the coordinates of the center of the circle
%r is the radius of the circle
%0.01 is the angle step, bigger values will draw the circle faster but
%you might notice imperfections (not very smooth)
ang=0:0.01:2*pi; 
xp=r*cos(ang);
yp=r*sin(ang);
plot(x+xp,y+yp);
end

If you want to add circles you must insert the command

hold on

before the circles being added.

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Rik 2020-5-3

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It's the step size. You can use the colon in two ways when you create an array:

start:stop
start:step:stop

Özgür Saglam 2020-5-3

Thank you very much!

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更多回答（3 个）

Michelle Hirsch 2016-1-29

18
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It's counter-intuitive, but this is actually really easy with the rectangle function. From the rectangle documentation :

   pos = [2 4 2 2];
   rectangle('Position',pos,'Curvature',[1 1])
   axis equal

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Royi Avital 2023-12-10

@Michelle Hirsch, It would be great if it had the DisplayName property like most other objects.

It makes easier when adding it to the legend.

Michelle Hirsch 2023-12-11

@Royi Avital I think it's more than just adding DisplayName - annotations like rectangle (intentionally) don't show up in legend since they are meant to be annotations, not data. Are you interested in being able to include annotations in legend? If so, please share more about your use case so I make sure we understand what you are thinking.

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