Add new pie chart renderer with polyline indicate

[wjacker]

Hey guys,

I add new pie chart renderer with polyline indicate, the appearance look like:

please have a look and see if this can merge into master branch :-)

[danielgindi]

@wjacker thank you very much! This is a wonderful contribution.
I will merge it to another branch and introduce this as a feature for the current renderer to avoid duplicate code. (If you want, you can try and do that yourself)

[wjacker]

@danielgindi awesome, please help me do that merge, many thanks!😄

[Perjan]

Awesome, hey @danielgindi please merge it man :)

[danielgindi]

Yes do not worry guys :-)
It's not everyday that I have time to work on PRs... But I'm on it.
There's some work to merge it as a feature for the basic renderer, and more work to port it to Android as we're cross platform.

But as I said, I'm on it ;-)

[danielgindi]

This is merged to branch labels-around-pie, and will be merged as soon as I'll completed the Android side of it

[danielgindi]

Yeah we're done!
Now you can choose for either x or y labels - to render in slice of around the pie with lines.
The demo shows that you can separate them.

Thank you for your contribution!

[BurhanMughal]

@wjacker Thank you very much for awesome work, Unfortunately I can't implement right now, Will be in my consideration in future.
Thanks Man!

[liuxuan30]

great work!