JS Canvas Spatter SRC

<!DOCTYPE html>
<html>
<body onmousemove="drawe();" onchange="drawe();">
<canvas id="myCanvas" width="500" height="500" style="border:1px;background-color:red;">
Your browser does not support the canvas element.
</canvas>
<script>
function drawe(){
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.moveTo(event.x++,event.y=+1);

ctx.arc(Math.random()*73,Math.random()*32,Math.random()*Math.sin(event.x),Math.random()*Math.cos(event.y)*178,Math.sin(33),Math.cos(44));
ctx.fill();

}
</script>
</body>
</html>