'marker+text' mode for bar charts

[jackparmer]

Currently, we have to make annotations for bar charts because 'markers+text' mode (Reference: https://plot.ly/javascript/reference/#scatter-mode) does not extend to bar charts like this one:

https://plot.ly/javascript/bar-charts/#bar-chart-with-direct-labels

This can be tedious for a large number of bars, especially if someone is using the Web App. It would be nice if 'markers+text' mode existed for horizontal and vertical bar charts.

[etpinard]

having mode: 'makers+text' for bar charts doesn't make sense for as mode: 'text' would be a degenerate text chart.

[etpinard]

I would use textposition instead, similar to what we do for pie charts.

with dflt: 'none' (meaning hover text only).

[jackparmer]

Ah, great points! That's a sweet idea!

[chriddyp]

related: plotly/plotly.py#356

[cldougl]

Cool - thanks for the textposition tip @etpinard !

[ryanlin1986]

This is a productivity boost.

[alexcjohnson]

In fact more pieces of the pie chart text functionality should be replicated here - like textposition='auto' putting labels inside the bars if they fit (or if there's another bar stacked on top), and outside otherwise; shrinking the label if need be when it's displayed inside; insidetextfont and outsidetextfont so you can have differences (usually just different color, like white inside and black outside) in addition to textfont controlling them both.

[etpinard]

Perhaps bar charts with barmode: 'stacl' should show totals: #85

[n-riesco]

@jackparmer @cldougl The PR for #80 is almost completed. I'm planning to work on this issue now.

[n-riesco]

@etpinard @alexcjohnson I have a PR that implements this feature ready for review on my repo.

[etpinard]

Thanks @n-riesco I'll take at your PR before days end. Cheers 🍻