Rounded bars in bar charts

[Pearapps]

Issue Link 🔗

Other PR: #3754

I understand that there are other attempts at this, but I am working on a project that requires this - so I forked this and gave it a shot with the latest master.

Goals ⚽

Provide ability to round bar charts for charts that contain only positive values.

Implementation Details 🚧

Pretty straightforward - provides a property to set the multiplier you wish to drive the corner radius - and the renderer searches for the correct bar segment to apply that to, and draws it with a path.

[codecov-commenter]

Codecov Report

Merging #4375 into master will decrease coverage by 0.06%.
The diff coverage is 23.33%.

@@            Coverage Diff             @@
##           master    #4375      +/-   ##
==========================================
- Coverage   40.81%   40.75%   -0.07%     
==========================================
  Files         124      124              
  Lines        9490     9519      +29     
==========================================
+ Hits         3873     3879       +6     
- Misses       5617     5640      +23     

Impacted Files	Coverage Δ
...ata/Implementations/Standard/BarChartDataSet.swift	72.09% <ø> (ø)
Source/Charts/Renderers/BarChartRenderer.swift	71.04% <23.33%> (-2.99%)	⬇️

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[liuxuan30]

any reason/highlight you send this PR to us?

[Pearapps]

any reason/highlight you send this PR to us?

Didn't seem like there was any movement on the existing efforts, and people really want and need this (including myself) - and I wanted to provide this work for you all to use or iterate on.

[amiantos]

Do you have an example of how this is supposed to work? Any value I pass to roundRadiusWidthMultiplier seems to result in a crash. I am using a stacked bar chart.

[Pearapps]

Do you have an example of how this is supposed to work? Any value I pass to roundRadiusWidthMultiplier seems to result in a crash. I am using a stacked bar chart.

What values are you passing in? And what is the crash?

Here is what I am setting it to: 1.0 / 4.0

[amiantos]

I tried 1.0, 0.2, 0.5..

I don't really know what the crash is. Seems to happen no matter what value I put in there.

[liuxuan30]

for rounded bar, I think the best PR so far is #3754. However the author not responding, and we really are also busy with our jobs... so, if you think you want to contribute, I guess you will take some from #3754?

The main problem for rounded bar is, when the bar is thinner, the rounded bar will look like an oval, which is not ideal. #3754 said she/he solved it. if you want to take it from here, if you can solve this, we'd happy to review

[4np]

This would be easy to accomplish by providing your custom renderer, if #4297 was merged.