Scattergl fails in "lines" mode with >= 100k data points

[qballed]

Scattergl (and not Scatter) silently fails in "lines" mode since the 3.4 release when there are >= 100k data points. The resulting chart fails to display anything but produces two JavaScript errors instead.

import plotly.offline as pl
import plotly.graph_objs as go
import numpy as np

# Works in 3.3 and 3.4
pl.plot([go.Scattergl(x=list(range(99999)), y=list(np.random.random_sample(99999)), mode = 'lines')])

# Works in 3.3, fails in 3.4
pl.plot([go.Scattergl(x=list(range(100000)), y=list(np.random.random_sample(100000)), mode = 'lines')])

Resulting JavaScript errors are:

Uncaught TypeError: Cannot read property 'sizeAvg' of undefined
at Object.calc (temp-plot.html:7)
at _ (temp-plot.html:7)
at Object.v.doCalcdata (temp-plot.html:7)
at Object.r.plot (temp-plot.html:7)
at Object.r.newPlot (temp-plot.html:7)
at temp-plot.html:7

temp-plot.html:7 Uncaught TypeError: Cannot read property '0' of undefined
at Object.v.supplyDefaultsUpdateCalc (temp-plot.html:7)
at Object.v.supplyDefaults (temp-plot.html:7)
at r.plot (temp-plot.html:7)
at Object.r.call (temp-plot.html:7)
at r.layoutReplot (temp-plot.html:7)
at Object.l.syncOrAsync (temp-plot.html:7)
at t (temp-plot.html:7)
at Object.r.call (temp-plot.html:7)
at temp-plot.html:7
v.supplyDefaultsUpdateCalc @ temp-plot.html:7
v.supplyDefaults @ temp-plot.html:7
r.plot @ temp-plot.html:7
r.call @ temp-plot.html:7
r.layoutReplot @ temp-plot.html:7
l.syncOrAsync @ temp-plot.html:7
t @ temp-plot.html:7
r.call @ temp-plot.html:7
(anonymous) @ temp-plot.html:7

This has been tested on:

• Chrome 70.0.3538.77 (Official Build) (64-bit)
• Firefox 60.3.0esr (64-bit)

[qballed]

Also being tracked now in plotly.js 1.42

https://github.com/plotly/plotly.js/issues/3226

[jonmmease]

Fixed in version 3.4.1. Thanks again for the report!