Oscilloscope

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    
    body {
        background: #2f3337 !important;
      	padding: 0px;
        margin: 0px;
    }
    
    svg {
      	padding: 0px;
        margin: 0px;
    }
    
    #chart {
      text-align: center;
      margin: 0px;
      padding: 0px;
    }
    
    .dots {
      fill: #53535f;
    }
    
    .line {
      stroke: #22ffc5;
      stroke-width: 1;
      stroke-opacity: .75;
      fill: none;
		}
  </style>
</head>

<body>
  <div id="chart"> </div>
  <script>
    
    var margin = {top: 60, right: 60, bottom: 60, left: 60},
        width = window.innerHeight*2 - margin.left - margin.right,
        height = window.innerHeight - margin.top - margin.bottom,
        numTicks = 20,
        numDashes = 5,
        numDots = 20;
        tickSpace = 8;

var y = d3.scaleLinear()
        .range([height, 0])
        .domain([-1,1])

var x = d3.scaleLinear()
        .range([0, width])
        .domain([-2,2])

var xConversion = d3.scaleLinear()
        .range([-2, 2])
        .domain([0, 1])

var svg = d3.select("#chart").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .style("filter","url(#I)")
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var defs = svg.append("defs");

var filter = defs.append("filter").attr("id","spect");

var turbulence = filter.append("feTurbulence")
        .attr("baseFrequency",".4")
        .attr("numOctaves","2")
        .attr("seed", 201);
    
    var filterGoo = defs.append("filter").attr("id","gooeyCodeFilter");

filterGoo.append("feGaussianBlur")
        .attr("in","SourceGraphic")
        .attr("stdDeviation","5")
        .attr("color-interpolation-filters","sRGB") 
        .attr("result","blur");
    
    filterGoo.append("feColorMatrix")
        .attr("in","blur")
        .attr("mode","matrix")
        .attr("values","1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7")
        .attr("result","gooey");

var backgroundnoise = svg.append("rect")
        .attr("filter","url(#spect)")
        .style("opacity", .2)
        .attr("width", width)
        .attr("height", height);

svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x).tickSize(-height).ticks(numTicks))
        .selectAll("line")
        .style("stroke-dasharray", function(d,i) { 
            var dashArray = []
            for (var k = 0; k < numTicks; k += 1) {
                dashArray.push((height/numTicks - (tickSpace/2) - (k > 0 ? (tickSpace/2) : 0)));
                dashArray.push(tickSpace)
            }      
            return dashArray.join(",") })

svg.append("g")
        .attr("class", "y axis")
        .call(d3.axisLeft(y).tickSize(-width).ticks(numTicks))
        .selectAll("line")
        .style("stroke-dasharray", function(d,i) { 
            var dashArray = []
            for (var k = 0; k < numTicks; k += 1) {
                dashArray.push((width/numTicks - (tickSpace/2) - (k > 0 ? (tickSpace/2) : 0)));
                dashArray.push(tickSpace)
            }         
            return dashArray.join(",") })

var line = d3.line()
        .curve(d3.curveCatmullRom)
        .x(function(d) { return x(d.x); })
        .y(function(d) { return y(d.y/10); });

var data = []

svg.append("path")
        .datum(data)
        .attr("class", "line")
        .attr("clip-path", "url(#clip)")
        .attr("d", line)
        .style("filter", "url(#gooeyCodeFilter)");

svg.selectAll(".verticalDashes")
        .data(d3.range(numTicks*numDashes).map(Object))
      .enter().append("line")
        .attr("class", "verticalDashes")
        .attr("y1", function(d, i) { return i*(height/numTicks/numDashes); } )
        .attr("y2", function(d, i) { return i*(height/numTicks/numDashes); } )
        .attr("x1", x(-.025))
        .attr("x2", x(.025))
        .style("stroke", "#000")
        .style("stroke-dasharray", function() {
            var unit = x(.025) - x(0);
            return (unit - (tickSpace/4)) + "," + (tickSpace/2) + "," + (unit - (tickSpace/4))
        })

svg.selectAll(".horizontalDashes")
        .data(d3.range(numTicks*numDashes).map(Object))
      .enter().append("line")
        .attr("class", "horizontalDashes")
        .attr("x1", function(d, i) { return i*(width/numTicks/numDashes); } )
        .attr("x2", function(d, i) { return i*(width/numTicks/numDashes); } )
        .attr("y1", y(-.025))
        .attr("y2", y(.025))
        .style("stroke", "#000")
        .style("stroke-dasharray", function() {
            var unit = x(.025) - x(0);
            return (unit - (tickSpace/4)) + "," + (tickSpace/2) + "," + (unit - (tickSpace/4))
        })

svg.selectAll(".rowOne dots")
        .data(d3.range(numTicks*numDots).map(Object))
      .enter().append("circle")
        .attr("class", "rowOne dots")
        .attr("cx", function(d, i) { return i*(width/numTicks/numDots); } )
        .attr("cy", function(d, i) { return i % 2 == 0 ? y(.28) : y(-.28) })
        .attr("r", 1);

svg.selectAll(".rowTwo")
        .data(d3.range(numTicks*numDots).map(Object))
      .enter().append("circle")
        .attr("class", "rowTwo dots")
        .attr("cx", function(d, i) { return i*(width/numTicks/numDots); } )
        .attr("cy", function(d, i) { return i % 2 == 0 ? y(.44) : y(-.44) })
        .attr("r", 1);

svg.append("clipPath")
        .attr("id", "clip")
      .append("rect")
        .attr("width", width)
        .attr("height", height);

var strokeWidth = 10;
    var t = d3.interval(function(elapsed) {

data.push({x: 0, y: 0});
        xConversion.domain([0, data.length-1])

data.forEach(function(d, i) {
            d.x = xConversion(i)
            d.y = Math.tan(i+1)
        });

strokeWidth -= .01

svg.select(".line")
            .datum(data)
            .attr("d", line)
            .style("stroke-width", strokeWidth)

if (elapsed > 30000) t.stop();
    }, 10);

</script>
</body>

https://d3js.org/d3.v4.min.js