Re: [Matplotlib-users] Plotting a circle while also changing the limits of the axes

[Benjamin R. <ben...@ou...>]

On Mon, Nov 5, 2012 at 4:22 PM, Jason Grout <jas...@cr...>wrote:

> On 11/5/12 3:19 PM, Benjamin Root wrote:
> >
> >
> > On Mon, Nov 5, 2012 at 3:51 PM, Brad Malone <bra...@gm...
> > <mailto:bra...@gm...>> wrote:
> >
> >     Hello,
> >
> >     I am trying to plot some small circles in my plotting window, in
> >     addition to the curves I'm already plotting. If I don't want to set
> >     my x- and y- axis scales equal to each other, a naive drawing of a
> >     circle results in an ellipse.  To fix this problem I found some nice
> >     example code online here :
> >
> http://stackoverflow.com/questions/9230389/why-is-matplotlib-plotting-my-circles-as-ovals
> ,
> >     which solves the problem by basically plotting an ellipse, but an
> >     ellipse which will look like a circle in the display window.
> >
> >     That works all fine for me, but then, if I change my xlim or ylim
> >     using ax1.set_xlim((something1,something2)) then the solution no
> >     longer works, and I get an ellipse.
> >
> >     A minimal example showing the breaking behavior can be seen below.
> >
> >
> > I am probably gonna reply to that stackoverflow question with a better
> > response...
> >
> > Essentially, you want a similar behavior to the markers in the scatter
> > plots, right?  As you zoom or resize the plot, the circle markers stay
> > as circles and have the same size relative to the size of the figure.
> > If that is what you want, the way to do that is very easy.
> >
> > ax1.scatter([0.5], [0.5], s=30)
> >
> > Or whatever size you want (units of points).
>
> I think the units are points^2, i.e., area of the circle...
>
> Thanks,
>
> Jason
>
>
Right, thank you.  I keep forgetting that.

Ben Root