plasm | JavaScript Programming Language for Solid Modeling | Runtime Evironment library

So I have about a year a 5/12 months experience playing around with java but I have never been able to make anything outside of skeletons. I would really appreciate it if someone could help me understand how I can make an image from my computer visible using swing.

I have gone between different websites trying to find answers but none of the example codes I've tried have worked out. Stackoverflow has helped in the past to learn java through various questions other people asked so I have made an account to ask a question myself. I'm probably being very dumb but my image never appears despite what I've tried. I come back to trying to understand swing every few months after giving up on it previously and while I feel I have a grasp on some basic concepts such as something should be set as visible, how to make/add a JFrame, etc, it's always this that messes me up.

SUMMARY

There is an out of place rectangular red box at the bottom of my screen.

BACKGROUND

Using Chrome’s Developer Tools on my local dev workspace, I’ve pin-pointed the source of the issue to a relatively newly introduced canvas element, which I don’t fully understand. I’ve explored w3school’s doc along with Chris Coyier’s main blog post on HTML canvas and I don’t really understand how to use the canvas element properly in this situation.

MY CODE

Here is my reduced test case on CodePen.

Here is the HTML:

I'm reading in query parameters and converting them into a Map[Symbol, String]. I would like to add some type safety to these query parameters through a set of case classes.

These case classes will be different depending on the incoming http request, so this needs to support different case classes.

If the incoming query parameters don't match the defined case class the Parser should return None.

I have attempted to use shapeless to implement a generic parser. It work's if all of the parameters are of type String. But I need to support any type of query parameter.

I've tried to incorporate the implicit conversion logic seen in this post, but unable to get it working. https://meta.plasm.us/posts/2015/11/08/type-classes-and-generic-derivation/ (new to shapeless)

Existing Parser (without string to type conversion):

When encoding to Json with circe we really want the type field to show e.g.