drawing a circle

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lowcalorie
lowcalorie 2012-5-23
回答： Chad Greene 2014-12-9
please help i need to draw a green circle of radius 0.8 centered at x =2 , y=1.5 and display the result with the correct aspect ratio that is as a circle not an ellipse
then i need to fill the circle with gray and mark the center of the circle with a black X

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回答（2 个）

Image Analyst
Image Analyst 2012-5-23
Several methods are listed in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
Make sure you set "axis square" or "axis equal" and call "hold on" before you call text() or plot() to put on the "X".
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Oleg Komarov
Oleg Komarov 2012-5-23
Have you checked the link? It has code examples.
Also do NOT double post.
Your post is NOT an emergency:
http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency
Walter Roberson
Walter Roberson 2012-5-23
You do not actually need "hold on" before using text() or line() or patch() or a small number of other primitive calls. However, plot() is not a primitive call and you _do_ need "hold on" before using it to overlay data on the same axes.

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Chad Greene
Chad Greene 2014-12-9
With circles
circles(2,1.5,0.8,'facecolor','green');
axis equal

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