D3 Examples - fisheye

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .rect-shadow {
      box-shadow: 0 0 5px #999;
    }
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
        .append('g')
        .classed('group', true)
        .attr('transform', `translate(${20}, ${20})`)
​
    let xScale = d3.scaleLinear().domain([0, 300]).range([0, window.innerWidth - 30]).clamp(true)
    
   let rects = svg.selectAll('rect')
        .data(d3.range(300))
        
  rects.exit().remove();
    
    rects.enter()
        .append("rect")
      .attr("y", 95)
      .attr("x", (d, i) => xScale(i))
      .attr("width", 1)
        .style('fill', 'rgb(81, 170, 232)')
      .attr("height", 117);
    
    svg.append('rect')
            .attr("y", 95)
        .attr("x", xScale(0))
        .attr("width", xScale.range()[1])
        .style('opacity', 0)
        .attr("height", 117)
        .on('mousemove', () => {
            let x = d3.event.x - 20;
​
            console.log('x', x)
​
            d3.selectAll('rect')
              .attr('x', (d, i) => fisheye(d, x))
          })
          .on('mouseleave', () => {
             d3.selectAll('rect')
              .attr('x', (d, i) => xScale(i))
        })
​
    let distortion = 100;
    function fisheye(_, a) {
      let x = xScale(_),
          left = x < a,
          range = d3.extent(xScale.range()),
          min = range[0],
          max = range[1],
          m = left ? a - min : max - a;
      if (m === 0) m = max - min;
      return (left ? -1 : 1) * m * (distortion + 1) / (distortion + (m / Math.abs(x - a))) + a;
    }
    
    
  </script>
</body>
​
    