[Feature Request] Bar Graphs

[caemor]

What is the feature ?

Add support for bar graphs which are similar to histograms but slightly different ;-)

Examples for bar graphs:

(image from https://www.mathsisfun.com/data/bar-graphs.html)

or

(Optional) Why this feature is useful and how people would use the feature ?

It's similar to histograms but is more focused on categories/... and doesn't only work for continous data.

[38]

Hi there, thanks for the feature request. If my understanding is correct, the feature is already supported by Plotters.

Plotters is actually a drawing library that makes plotting easier, which means it doesn't limits you on predefined plot types. In general, we abstract a series as a iterator of drawable elements.

Thus the feature can be supported by passing an iterator of rectangles to ChartContext::draw_series.

I am documenting all those stuff (but very slowly). And this may be more detailed answer to how to draw the chart. https://plotters-rs.github.io/book/basic/basic_data_plotting.html#histogram

[caemor]

Thanks for your response :-)
I already tried it with the histogram type yesterday but I wasn't able to either add specific labels to each rectangle (so I wouldn't need any floats) or to use float values in my histogram. So it's more a program to label my data correctly (or alternatively to draw it on the correct position of the diagram. But maybe I tried it the wrong way and would be happy to get some pointers if this is already possible with the current version.

[matiu2]

I too would like to draw bar graphs. My X axis is a Category axis with values (in days): <1, 1-3, 3-6, 6-9 days, >9 days

I've spent almost a whole day trying to figure out how to do it. I think I want to use a plotters::coord::Category but Histogram's don't support that because it doesn't implement plotters::coord::DiscreteRanged

And of course I can't implement it in my own code; I'll try hacking the source..

[matiu2]

Sorry I found a bug and force pushed.

It's still not working 100% for me; I'm getting an extra column on the left, and I have no idea why :(

All help appreciated.

[38]

I suppose this is already supported by v0.3 when using slice as coord spec, so closing the issue