Wow, thanks for making this! I’m having lots of fun playing with it.
A quibble: Choosing between Draw|Erase|Toggle is awkward on mobile (Safari on iPhone). The old toggle between Draw|Erase was quick but the new pulldown list widget is in the upper left while the choices always pop open at the bottom of the screen.
Perhaps move the pulldown list to the bottom on mobile or make it two toggle buttons (Mode: Draw|Erase, Line type: Bounce|Toggle)?
Some enhancement ideas:
Add a mark where the dots drop from and perhaps a faint line to show the drop path.
Add an edit mode so existing lines could be selected then either erased, moved, lengthened, shortened, or have their type changed between Bounce|Toggle. Going further allow a point to be selected and move it or rotate a line around it.
A quibble: Choosing between Draw|Erase|Toggle is awkward on mobile (Safari on iPhone). The old toggle between Draw|Erase was quick but the new pulldown list widget is in the upper left while the choices always pop open at the bottom of the screen.
Perhaps move the pulldown list to the bottom on mobile or make it two toggle buttons (Mode: Draw|Erase, Line type: Bounce|Toggle)?
Some enhancement ideas:
Add a mark where the dots drop from and perhaps a faint line to show the drop path.
Add an edit mode so existing lines could be selected then either erased, moved, lengthened, shortened, or have their type changed between Bounce|Toggle. Going further allow a point to be selected and move it or rotate a line around it.