What Topic Needed To render this?

[J. Insi]

Hello everyone!

I feel more comfortable when I have some task, dealing with Swing Rather than other topics.
Thus, When I read one of this case I'm a bit confused.
Preview:


I recall this is about the java 2d topics, in which the shape (oval, line, etc) lessons are covered.
I'm thinking there must be a library for achieving the main result.

But how about the coordinate for making a curve with the coordinate, what's that different layer? -pic 1 on upper box

What are the topics needed to render this image? -pic 1 & 2 both boxes

Is there any thread discussing about this matter, if so, which one?

[Randall Twede]

the same class that draws ovals and lines also draws curves