"p5.js is a JavaScript library for creative coding, with a focus on making coding accessible and inclusive for artists, designers, educators, beginners, and anyone else! p5.js is free and open-source because we believe software, and the tools to learn it, should be accessible to everyone.
Using the metaphor of a sketch, p5.js has a full set of drawing functionality. However, you’re not limited to your drawing canvas. You can think of your whole browser page as your sketch, including HTML5 objects for text, input, video, webcam, and sound."
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During my university courses at University of London, we made a side-scrolling video game, a sound visualizer, as well as a MS Paint clone using P5. It's definitely accessible for beginning JavaScript programmers.
Surprisingly, if you keep the feature set down, time to ship wasn't bad. The project was done in about half a semester and that's only working on it here and there. For the final project we had to implement three "advanced" drawing tools, I think one of the ones I came up with was to draw Bezier curves, now that wasn't exactly trivial and could definitely add some time to ship.
Depends on how feature complete you want it to be.
Back when I was working in Processing a lot, I could probably have whipped up something decent in an easy weekend. If I wanted to have more complicated features like flood fill, cutting/moving regions etc, I might need an extra day to figure it out.
If all you want is a bare minimum scribbling lines in a limited palette, that could probably be done in a matter of minutes.
"p5.js is a JavaScript library for creative coding, with a focus on making coding accessible and inclusive for artists, designers, educators, beginners, and anyone else! p5.js is free and open-source because we believe software, and the tools to learn it, should be accessible to everyone.
Using the metaphor of a sketch, p5.js has a full set of drawing functionality. However, you’re not limited to your drawing canvas. You can think of your whole browser page as your sketch, including HTML5 objects for text, input, video, webcam, and sound."