psuedoDraw.js

let isMouseDown = false
let points

let drawLoop = ()=>{
	if(isMouseDown) window.requestAnimationFrame(drawLoop)
	draw()
}

let mouseDown = (e)=>{
	isMouseDown = true
	points = [getPointerData(e)]
	window.requestAnimationFrame(drawLoop)
}

let mouseMove = (e)=>{
	if(isMouseDown) points.push(getPointerData(e))
}

let mouseUp = (e)=>{
	isMouseDown = false
}

let draw = ()=>{
	//drawing
}