[yt-users] Callbacks, plot.data.center
Nathan Goldbaum
nathan12343 at gmail.com
Wed Jul 2 10:18:09 PDT 2014
On Wed, Jul 2, 2014 at 8:37 AM, David Collins <dcollins4096 at gmail.com>
wrote:
> Hi, everyone--
>
>
> I"m trying to run a callback on a projected sphere, and I'm running into a
> missing piece of data.
>
> I'm doing the following:
>
> >>> sph = pf.h.sphere( c, w)
> >>> proj = pf.h.proj(1,'Density',source = sph)
> >>> pw=proj.to_pw( center= c, width=2)
>
If you instead do:
proj = pf.h.proj(1,'Density', source=sph, center=c)
I believe it will work.
>
> this works fine, and reproduces the plot I want. I have this callback
> that accesses "plot.data.center", but that seems to be an empty object.
> This callback is based on the ParticlesCallback, so it's accessing a sub
> region in the following manner below. So the plot object doesn't seem to
> be getting the center information any more. Is there a way to access this
> information now?
>
> Thanks!
>
> d.
>
> A snap from the relevant callback, the line that chokes is the access to
> data.center, and pdb says that the structure is None.
>
> def __call__(self, plot):
> data = plot.data
> # we construct a recantangular prism
> x0, x1 = plot.xlim
> y0, y1 = plot.ylim
> xx0, xx1 = plot._axes.get_xlim()
> yy0, yy1 = plot._axes.get_ylim()
> reg = self._get_region((x0,x1), (y0,y1), plot.data.axis, data)
>
> def _get_region(self, xlim, ylim, axis, data):
> LE, RE = [None]*3, [None]*3
> xax = x_dict[axis]
> yax = y_dict[axis]
> zax = axis
> LE[xax], RE[xax] = xlim
> LE[yax], RE[yax] = ylim
> LE[zax] = data.center[zax] - self.width*0.5
> RE[zax] = data.center[zax] + self.width*0.5
> if self.region is not None \
> and np.all(self.region.left_edge <= LE) \
> and np.all(self.region.right_edge >= RE):
> return self.region
> self.region = data.pf.h.periodic_region(
> data.center, LE, RE)
> return self.region
>
> --
> -- Sent from a computer.
>
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>
>
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