The variables will appear when your mouse is towards the top of the screen. Adjust the sliders in the demo. Press t to do a test.
I tried making a triangle filler using this technique, and I made it compatible with more than 3 points, and this is what happened. (The triangle filler works, just set the points to 3.) This isn't super fast, but it's not terrible either. The project isn't actually 100% pen because of the thumbnail. Inspired by scratch.mit.edu/projects/558167373, but all code is by me. Thumbnail made by the engine using TurboWarp's "high quality pen" option.
