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

[Jason G. <jas...@cr...>]

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