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This is super confusing. Why is there color-coding if "color means nothing"? What is the vertical axis? Why are these pre-rendered youtube videos?

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Thanks for feedback.

Dot travels from top left to the bottom right. Vertical axis shows which number is how far. It looked boring to me when I was using only single colour. I have more experience with using opencv for video rendering than JavaScript.

What would be good JavaScript library for this use case?

You could try Paper.js. If you use this, make sure to use Symbols instead of Path or Rectangle objects, otherwise you will run into performance issues quickly. There is an online editor at http://sketch.paperjs.org which is nice to play around with.

Thanks. I will take a look.

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