Preserving 64 bit floats for WebGL 2D plotting

[monfera]

Solution for #995

Rebased on #413 to allow testing with a date axis.

For non-fancy scattergl, this is also needed: gl-vis/gl-scatter2d#1

For fancy scattergl, this is also needed:

• markers: Double precision vertex calcs gl-vis/gl-scatter2d-fancy#2
• lines, line elbows (miters) and area shading: High precision conversion gl-vis/gl-line2d#1
• error bars: Conversion to high precision drawing gl-vis/gl-error2d#1

[etpinard]

Nice solution. Looking forward to this once #995 is complete 👍

[etpinard]

Nicely done here.

Let's change the file name though to typed_array_truncate.js (or something better?))

[etpinard]

@monfera amazing work 🎉

I've been playing with gl2d plots in the test dashboard for about 30 minutes now and I can't find any regressions.

Go ahead and merge + publish all the gl-vis PRs. Once that's done, you'll need to rebase off master for the gl2d image tests to pass on CircleCI (post #1067).

Then, we should modify the existing gl2d_date_axes mock and update its baseline to showcase the new high-precision logic.

Thanks again for your efforts 👍

[monfera]

@etpinard all the above steps are now done except the update to gl2d_date_axes.json. Now it uses a daily raster. Should I just change it to a millisecond raster, and also add some points for around 1970 (for testing that it can do milliseconds even if the temporal domain of the data spans decades)?

[etpinard]

Should I just change it to a millisecond raster, and also add some points for around 1970 (for testing that it can do milliseconds even if the temporal domain of the data spans decades)?

yes please!

[etpinard]

@monfera looks like the updated gl2d dates mock failed to generate on CircleCI - see here.

I wonder if CircleCi doesn't like Float64Arrays - which may be bad news for plot.ly's image server ...