Look into mouseEvent offsetX and offsetY

[asturur]

Mouse event offsetX and offsetY are now standard.
Using those should help remove a bunch of code related to our calcOffset logic and getElementOffset code that have custom logic to inspect the dom and figure out from page coordinates to canvas coordinates which is the correct translation.

https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent

[ShaMan123]

MouseEvent#offsetX/Y seems perfect. But TouchEvent doesn't have those props unfortunately.
Why don't we use getBoundingClientRect? Because of jsdom?

[asturur]

getBoundingClientRect is considered slow where possible we want to get rid of the necessity to call calcOffset is just an extra headache. Maybe touch events have something similar?
If it will optimize mouse only, still better than nothing