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Allow casting from GridImage to QuadMesh #1223

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merged 1 commit into from Mar 23, 2017

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@philippjfr
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philippjfr commented Mar 23, 2017

Useful now and will continue working just fine in the future when the image interface has been added. Lets you do something like this to get hover information from a datashaded plot:

%%opts QuadMesh (fill_alpha=0) [tools=['hover']]
points = hv.Points(np.random.multivariate_normal((0,0), [[0.1, 0.1], [0.1, 1.0]], (1000000,)))
datashade(points, width=400, height=400) * hv.util.Dynamic(aggregate(points, width=100, height=100),
                                                           operation=lambda x: hv.QuadMesh(x))

hover

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jbednar commented Mar 23, 2017

Looks good to me and seems safe; happy to merge when tests pass.

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jlstevens commented Mar 23, 2017

Looks good to me as well. Merging.

@jlstevens jlstevens merged commit ea02488 into master Mar 23, 2017

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@jbednar jbednar deleted the quadmesh_construct branch Mar 24, 2017

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stephanecollot commented May 8, 2017

That looks great!

Unfortunately I didn't succeed to make it work in my notebook. Could you show us the imports that are loading 'datashade' and 'aggregate'?
Also, is it possible to make it work for multiple time series?

Thanks for your help

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jbednar commented May 8, 2017

You can see how to use it in https://anaconda.org/jbednar/holoviews_datashader , which shows all required imports, and also shows how to work with multiple plots. This all requires conda install -c ioam holoviews.

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