Erase ellipse from figure?

Question

I'm new at python and new at graphics!! the thing is that I'm implementing an EKF map-based localization and I want to plot the uncertenty ellipse. For that I do, each time I want to update the figure with all the values I call a function call animate, which inside has this:

ellipse = matplotlib.patches.Arc([x_B_1[0,0],x_B_1[0,1]],P_B_1[0,0],P_B_1[1,1],x_B_1[0,2]*180/pi,color='green', linewidth='0.5')
ax.add_patch(ellipse)

And some other stuff

The thing is that by doing this all the ellipses saty in the figure and I get a mess (I can not post a picture of the figure because it's my first post and the forum does not allow me to do it), I want just the last ellipse.

How can I do it?

I can not do that because everything in the figure is lost, I just want to erase the ellipse not the rest of the things that I have on that figure, maybe it's not possible... Is there any option of updating the ellipse parameters so instead of drawing a new one I just update the one already drawn??

Cheers!

score 4 · Answer 1 · answered Apr 23 '12 at 22:31

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ellipse.remove() should do what you want

answered Apr 23 '12 at 22:31

kevmitch

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score 1 · Accepted Answer · answered Apr 18 '12 at 14:52

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I think your problem is that you have to clear the figure before you plot something else. Try with the clf() command of matplotlib

answered Apr 18 '12 at 14:52

maupertius

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How do I use the `clf` method with a list of ellipses? – praxmon Apr 03 '14 at 12:31

score 0 · Answer 3 · edited May 23 '17 at 12:06

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I see. You than want to, as you said, update the figure plot using set_data. Have a look at here for how to use it.

edited May 23 '17 at 12:06

Community

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answered Apr 19 '12 at 08:19

maupertius

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Erase ellipse from figure?

3 Answers3