Customize the bars (png)

[let-aurn]

First, huge thanks for this library.

Here are some features I really wish this lib can provide:

1. Set the border radius of the bars.
   My usecase lets the users zoom the generated image. And I wish to have some rounded corners there.
   

2. Add some spaces between the bars.
   At the end, 1. and 2. should output a waveform like this (the upper part)
   

3. Detect the bars representing beats, and draw them in a different color.
   DJay mobile app by Algoriddim (and almost every DJ app for desktop) does a good job about it.
   

I would love to contribute, but I know nothing about C++ 😬😶

[let-aurn]

So I tried to fix 1. and 2. here #112

I would love to contribute, but I know nothing about C++ 😬😶

Well, I guess we just need basic programming skills to achieve this.
It was mostly Mathematic instead 😄

[chrisn]

The latest version (v1.8.0) can produce rounded bars. Thanks for your contribution, it really helped!