[yt-dev] Implementing new Difference Plots

[Nathan Goldbaum]

One issue: what happens when you use the plot callbacks (e.g. the methods
like annotate_grids() that hang off the other PlotWindow plots)? Some of
the callbacks make sense for all plots (i.e. they just add a line, arrow,
or shape), others depend on metadata for a dataset. For your case, you'd
have to somehow combine the metadata from two datasets, i guess?

Another option is to blacklist callbacks that don't make any sense, see:

https://bitbucket.org/yt_analysis/yt/src/yt/yt/visualization/plot_window.py#plot_window.py-1783

On Tue, Dec 20, 2016 at 4:45 PM, Matthew Krafczyk <
krafczyk.matthew at gmail.com> wrote:

> Hi folks,
>
> I'm currently working on implementing a couple of plots to help
> investigate differences between two similar datasets.
>
> I've implemented DifferenceProjectionPlot, RelativeDifferenceProjectionPlot,
> and AsymmetryProjectionPlot.
>
> These are available at my fork of yt https://bitbucket.org/krafczyk/yt under
> the bookmark 'features/difference_plot'.
>
> Essentially, Each of these Plots is a subclass of PWViewerMPL like
> ProjectionPlot, but create's it's FRB by first creating FRBs for the two
> data sets then applying an operation to each pixel value to get a new
> derived value which is a part of the new FRB.
>
> For DifferenceProjectionPlot this is simply A-B
> For RelativeDifferenceProjectionPlot this is (A-B)/A
> For AsymmetryProjectionPlot this is (A-B)/(A+B)
>
> It's already been suggested to me that I can avoid creating three new
> classes by moving the choice of combination algorithm to a keyword
> argument, but I'd like to hear more suggestions.
>
> Thanks,
> Matthew Krafczyk
>
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