[yt-users] question about transfer function colorbar

[Chris Malone]

Hi Mike,

The number that is getting set (~9.92e6) is just one bin off from the
maximum value (you have a range of 2e7 and the default is 256 bins).  The
code that displays the colorbar, as best I can tell, occurs when you call
save_annotated.  This method eventually calls
ColorTransferFunction.vert_cbar where the ticks and limits are applied to
the colorbar axes object.

Looking over the logic in that code, it is not immediately obvious to me
why the index is off.  I suspect is has something to do with how the
`visible` variable is defined, but I'd need to play with a dataset and some
print statements...

Chris


On Wed, May 7, 2014 at 8:17 PM, Michael Zingale <
michael.zingale at stonybrook.edu> wrote:

> I'm trying to show the transfer function on a volume render.  Plotting a
> velocity component, I set the transfer function with 4 Gaussians all with
> the same width.  The range of the transfer function is -1.e7 to 1.e7, but
> for some reason, when output, the upper label in the colorbar is not 1.e7
> but a bit lower (9.92e6).  I am not sure where the code is that draws this,
> and I am confused why it is not setting the tick at 1.e7. It gets the
> bottom tick right.
> Here's an image:
>
> http://bender.astro.sunysb.edu/random/test_0000.png
>
> and the script:
>
> http://bender.astro.sunysb.edu/random/vol_rotate.py
>
> any pointers are appreciated.
>
> Mike
> --
> Michael Zingale
> Associate Professor
>
> Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
> 11794-3800
> *phone*:  631-632-8225
> *e-mail*: Michael.Zingale at stonybrook.edu
> *web*: http://www.astro.sunysb.edu/mzingale
>
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