Desynchronisation between the mouse and the plot when scrolling

[rigaudeauleo]

When we calculate the plot position, we use the cursor position on the whole page and not on the client!

We should use "ev.clientY"

[rigaudeauleo]

Like that :

//these are some utility functions
getMousePosition(ev) {
var rect = this.svgEl.getBoundingClientRect();
if (ev.clientX && ev.clientY) return { x: ev.clientX - rect.left, y: ev.clientY - rect.top };
if (ev.targetTouches.length) return { x: ev.targetTouches[0].clientX - rect.left, y: ev.targetTouches[0].clientY - rect.top };
return { x: 0, y: 0 }; //oops?
}