Adding bounding box feature

[HuangLiPang]

I have implemented the bounding box and used here.
You can see the demo.
I don't know if it is the bounding box you want. If it is, I can make a clean code version for pr.
This is a great plugin. Thank you!

[jonasrotilli]

That's perfect!
exactly what I needed!
Thanks for sharing, really this library is very good, congratulations to the participants in the development and community!

[spatialsparks]

Hi there
Thanks alot for sharing this! Nice map you got there and nice to see that the plugin is being used :)
Cheers

[luacy200820]

How can I make the interpolation calculation result fill the polygon?
@HuangLiPang example above seems to be unable to open.

[HuangLiPang]

Please check it here.

[luacy200820]

Thank. Is it possible not to use circle rendering, can it be rendered like this? Fill up the map.

[HuangLiPang]

@luacy200820 Please kindly modify the code here.