Single-datum bar trace with specified time range not showing

[henryzhao95]

For a bar chart with time on the x axis, only one data point, and a specified x axis range in the layout options, the chart does not display.

After a second data point is added, the chart displays as normal.

http://codepen.io/anon/pen/GryLNg

[n-riesco]

I've had a quick look at this issue and I've noticed that:

• Plotly v1.19.2 and earlier shows a bar but ignores layout.xaxis.range
• Plotly v1.20.0 and above doesn't show a bar but it honours layout.xaxis.range

This would point towards #1142. I'm not sure how. Anyhow, I'm guessing this issue is caused by the binning algorithm (that only uses data[0].x to compute the bin size).

[etpinard]

Thanks for the report @henryzhao95 !

[etpinard]

After a closer inspection, the bar in http://codepen.io/anon/pen/GryLNg fails to render because the bar plot step thinks that it has zero width here where x0 === x1.

By removing the set xaxis range value, we get:

which is a bar of 0.8 of a millisecond - which is arguably not a very good default on date axes.

@henryzhao95 by manually setting the bar width, you can archive a better-looking result, see http://codepen.io/etpinard/pen/XpLvWv

---

Perhaps we should make the default bar width for single-datum traces fixed in pixel space?

Referencing #1229 and #1308 which also highlight a few inconsistencies in single-datum bar traces.

[etpinard]

A couple more examples of the problem:

• https://jsfiddle.net/mo65wevq/
• https://codepen.io/rtjin/pen/bZYJOp
• http://codepen.io/anon/pen/rjWoyY

[etpinard]

Similar to #1181

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson