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<body style="background:black;margin:0"></body>

<script>
var SPACEW = document.body.clientWidth;
var SPACEH = document.body.clientHeight;

var canvas = document.createElement('canvas');
canvas.width = SPACEW;
canvas.height = SPACEH;
document.body.appendChild(canvas);

var ctx = canvas.getContext('2d');

var rad = SPACEH / 2;
var deg = 0.17;
var ang = 0;
var clean = true;

ctx.translate(SPACEW/2, SPACEH/2);

function draw(t) {
    var ang_ = ang + Math.PI - 2*deg;
    
    var ix = rad * Math.cos(ang);
    var iy = rad * Math.sin(ang);
    
    var ox = rad * Math.cos(ang_);
    var oy = rad * Math.sin(ang_);
    
    var c = Math.floor(360 * (t % 5000) / 5000);
    
    ctx.strokeStyle = 'hsl('+c+', 50%, 50%)';
    ctx.lineWidth = 10;
    ctx.beginPath();
    ctx.moveTo(ix, iy);
    ctx.lineTo(ox, oy);
    ctx.stroke();
    
    if (clean) {
        ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
        ctx.fillRect(-SPACEW/2, -SPACEH/2, SPACEW, SPACEH);
    }
    
    ang = ang_;
}

function loop(t) {
    draw(t);
    requestAnimationFrame(loop);
}

loop(0);

canvas.addEventListener('mousemove', function (e) {
    deg = Math.PI * e.offsetY / SPACEH;
    rad = 20 + (SPACEW / 2 - 20) * e.offsetX / SPACEW;
});

canvas.addEventListener('click', function (e) {
    clean = !clean;
});

</script>

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