Kotlin Hierarchical Drawing + Animation

KotlinBytes - Kotlin Hierarchical Drawing + Animation

I think it is impressive how clean and easy it is to draw with Kotlin without any extra libraries. I created a very simple drawing framework around AWT that leverages some of Kotlin’s unique features, such as the use of a Function Literal with Receiver.

Sourcecode:

More details on Receiver Lambda (Function Literals with Receiver):

Music:
Attribution 4.0 International (CC BY 4.0)

Attribution 4.0 International (CC BY 4.0)

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There is something you don't show us here?
How did you get the Animation window in the IDE??