Overlays in BQPlot

[spacetelescope]

Overlays in BQPlot

[stscijgbot]

This ticket is now being tracked at DATJPP-111

[robelgeda]

There are no functions to do a contour overlay in bqplot. I asked Maarten how hard it is to implement this (waiting to hear back). Moving on to the second point.

[robelgeda]

Axes locking is possible with plotly and is very easy to change the current code base to this paradigm.

[robelgeda]

Demo notebook at #33

[brechmos-stsci]

@astrofrog @nmearl @robelgeda @brechmos-stsci and a couple others had a discussion about BQPlot vs Plotly. My notes are here:

• T:bqplot does well with webgl for images and markers so is very fast
• N: Plotly does have webgl
• T: GJ can override image artists for bqplot to get data
• T: wants GJ to support plotly either way
• C: how much is plotly in GJ
• N: copied bqplot implementation and put plotly in, so some implemented but not a lot
• T: GJ might have changed too much
• T: plotly will have to support smart sampling (for large images)
• R: might need to ask Maarten about adding contours into bqplot
• T: could create a custom mark and then use matplotlib to create the contours (?)
• T: might be a week to get feature parity using plotly

Recommendation:

• determine how much of Maarten's time it would take to get a first pass at contours implemented in BQPlot
• short / medium term implement Plotyly functionality in glue-jupyter which @astrofrog wants to do anyway (so whether he implements or one of us continues the work @nmearl started.

Todo:

• @nmearl create a PR against glue-jupyter with the initial plotly implementation
• @hcferguson / @eteq we need to determine how much time from Maarten we will have / we can get, in particular with this type of work (the initial thought is that it might be 3-4 days [??] to get an initial implementation of contours in bqplot, alternatively, maybe a day of his time and 4-5 of a person at STScI, but then we would still have to get it merged.)

cc @camipacifici @eteq @hcferguson

[SaOgaz]

With consent of @brechmos-stsci we are closing this issue, this was information rather then implementational.