JS Canvas Webcam The Annoying Freq FX With Rainbows

<script>
var audioCtx=new AudioContext();
var oscillator = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
var FreqMax = 30000;
var VolMax = 10.0;
var Freq = 1000;
var Vol = 0.1;
oscillator.type = 'sine';
oscillator.frequency.value = Freq;
oscillator.start();
gainNode.gain.value = Vol;
var CurX;
var CurY;
document.onmousemove = updatePage;
function updatePage(e) {
CurX = (window.Event) ? e.pageX : event.clientX + (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft);
CurY = (window.Event) ? e.pageY : event.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);
oscillator.frequency.value = (event.x/WIDTH) * FreqMax;
gainNode.gain.value = (event.y/HEIGHT) * FreqMax;
canvasDraw();
}
</script>

<html>
<body onmousemove="drawe();" onchange="drawe();">
<canvas id="myCanvas" width="500" height="500" style="border:1px">
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);
//ctx.lineThickness='100px';
//.arc(event.x+5,event.y+5);
ctx.stroke();
}
</script>
</body>
</html>
<body bgcolor="black" onmousemove="drawe();" onmousedown="drawe" onchange="drawe" ondoubkeclick="drawe;">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" onchange="drawe;" topmost=false onchange="drawe;" width="5000" height="5000" style="opacity:1.0;fillColor:none;">
<script>
var ii=1;
var inn=50;
var video = document.getElementById("video");
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
var mediaConfig = { video: true,audio:false};
function drawe(){
var possible = "FABCGDE0123456789";
var text = "";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
for(var i=0; i!=6; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.fillStyle="#"+text;
document.body.bgcolor=text;

   ctx.arc(event.x,event.x,event.y,event.y,Math.PI*180);
ctx.fill();
ctx.topmost=true;
  c.style.opacity=1.0
ctx.drawImage(video,event.x,event.y,event.x,180)
ctx.draw();

text='';
}
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
if(ctx.width==500){event.mouseMove++;}
video.src = this.window.URL.createObjectURL(stream);
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
canvas.style.opacity=1.0;
canvas.style.opacity++;
ctx.topmost=true;
ctx.drawImage(video,event.x,event.y,event.x,event.y)},.9);
ctx.draw();
}, false);
});
</script>