Samples are hard to use

The samples are hard to use and hard to understand because of complexity.

* First off, I could not find what "Utils" is and where it is defined.
* You should absolutely provide a jsfiddle or codepen for each sample.
* For instance, I tried to get round labels as demonstrated in the samples, but could not find how to do it. I was only able to get elliptical labels which is not what I want.