In less than 500 lines of code, I created a crayon physics demo program using Free Pascal. Check it out at the link below. Source code is included at the bottom of the page.

https://www.getlazarus.org/videos/physics/catapult/

I've tested it out and it runs well on Windows, Linux, Mac, and smoothly on Raspberry Pi (using the OpenGL ES2 backend).
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On Thu, Nov 11, 2021 at 9:54 PM Anthony Walter via lazarus wrote:

My eye just caught this typo:

{ TDrawPhsyics is a scne
obviously you mean "scene".

Thank you. Corrected.
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