Enhanced pie chart functionality (custom sector corner spacing)

[qingshan007]

Hello Superset Community:

I have enhanced the visualization function of the pie chart, but there are some issues that I would like to hear everyone's opinions on.

Visualization Object ->Pie Chart:


1. Support custom sector spacing
2. Support custom sector fillet radius
3. Delete "Total:" as it occupies unnecessary space
   
   
   

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There is also a chart:
I don't know if I need to create a new chart type to build or continue configuring using a pie chart

Question:
The pie chart configuration will become more complex because the increase in configuration items is not conducive to users intuitively building the desired chart style

in addition，Do any friends need these functions?




[qingshan007]

In addition, I would also like to put forward an optimization suggestion:


1. Regarding the interface for creating chart objects and the issue of thumbnails. There are some charts that can create column charts, step charts, line charts, and area charts. Then shouldn't it be the case that not only one type is displayed on the thumbnail, but also the layout is split, with four different types of charts displayed on one thumbnail.
   
   Although having many types of charts is a good thing, how to enable users to quickly find the types of charts they need to construct, I think it is necessary.
   
   As shown in the figure:
   
   
   
   Similarly, pie chart types can create pie charts, circular charts, fan-shaped charts, and rose charts. It can also be split in this way, otherwise when users see it, they need to switch back and forth to check the thumbnail in the detailed description of the chart to understand what style of chart can be constructed.

[rusackas]

I'll convert this to an Ideas thread, since it's not a bug, but is an enhancement idea.

That said, I'm excited about the idea! @villebro and I have talked about this in the past, and I welcome the radius/spacing controls.

Removing "Total" might be controversial, but I have no personal objection.

I would advise opening a pull request with these changes, and we can review it there. I'm excited!

We can definitely merge additional pull requests with similar changes on other/related charts. The more control/flexibility, the better!

[rusackas]

Oh, and thank you for (potentially) volunteering, @qingshan007 :)