Updated version at https://scratch.mit.edu/projects/965171550/ *sniff* *sniff*... I smell Ultrahand... wasd keys to move the bottom of the curve mouse pointer to move the top
For the mouse smoothing, I used this forum post: https://scratch.mit.edu/discuss/topic/252557/?page=1#post-2588873 For the actual curve, well, that's obvious. The project was linked in the Scratch WIki.
