const mouse = {
  x: undefined,
  y: undefined,
}

$('#canvas').mousemove(function(){
  mouse.x = event.x
  mouse.y = event.y
})

let circleArray = []

//Create circles based on how long you hold the mouse down
let timer = 0
$('#canvas').mousedown(function () {
  timer = new Date()
}).mouseup(function () {
  let timePassed = (new Date () - timer)/10
  if(timePassed > 100){
    timePassed = 100}
let radius = timePassed
timer = 0
let x = event.x
let y = event.y
let dx = (Math.random()-0.5) *10
let dy = (Math.random()-0.5) *10
circleArray.push(new Circle(x, y, dx, dy, radius))
});