[yt-users] Animation of annotated projection plot

[Nathan Goldbaum]

Hi Hao,

This was due to a bug in the _switch_pf function.  I've issued a pull
request to fix it here:
https://bitbucket.org/yt_analysis/yt/pull-request/1132/fixing-an-issue-with-plots-created-via/diff

-Nathan


On Tue, Aug 5, 2014 at 6:57 AM, Hao Wang <hwang.phy at gmail.com> wrote:

> Hi all,
>
> I have been trying to make a movie out of annotated projection plots but
> encountered the following problem:
>
> ------------error message-----------------------------
>   File "...../yt/src/yt-hg/yt/visualization/plot_modifications.py", line
> 1157, in _get_region
>     LE[zax] = data.center[zax] - self.width*0.5
> TypeError: 'NoneType' object has no attribute '__getitem__'
> --------------------------------------------------------------
>
> I pasted the script (copied from the yt Cookbook) I used below. It worked
> fine without the "prj.annotate_particles(1.0)" line. The annotation itself
> works too -- the figure looks good in the IPython notebook.
>
> ======Script (anim.py)==================================
> import matplotlib.animation as anim
> from matplotlib.backends.backend_agg import FigureCanvasAgg
> from yt.mods import *
>
> prj = ProjectionPlot(load('DD0000/DD0000.hierarchy'), "z", 'Density')
> prj.annotate_particles(1.0) # adding this line causes error
>
> fig = prj.plots['Density'].figure
> fig.canvas = FigureCanvasAgg(fig)
>
> def animate(i):
>     filename = './DD%04i/' % i + 'DD%04i' % i + '.hierarchy'
>     pf = load(filename)
>     prj._switch_pf(pf)
>
> density_ani = anim.FuncAnimation(fig, animate, frames=100, interval=100,
>         blit=False)
>
> density_ani.save('density_animation.mp4')
> ====================
>
> Could anyone point out the problem?
>
> Thanks in advance,
> Hao
>
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>
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