D3 Examples - Generative Patterns

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .parent-container {
      position: relative;
    }
    
    .pattern-container {
      position: absolute;
      width: 100%;
      height: 500px;      
    }
​
    .pattern {
      fill: none;
      stroke: #857979;   
      stroke-width: 1px;
    }   
  </style>
</head>
​
<body>
  <div class="parent-container">
    <div class="pattern-container">
      <svg width="100%" height="100%">
        <defs>
          <pattern id="Pattern" x="0" y="0" width="60" height="60" patternUnits="userSpaceOnUse">
            <path class="pattern first" d="M0 30,40 60,50 60,60 30,50 0,40 0,0 30" />
            <path class="pattern second" d="M60 30,20 60,10 60,0 30,10 0,20 0,60 30" />
          </pattern>
        </defs>
​
        <rect fill="url(#Pattern)" width="100%" height="100%"/>
      </svg>
    </div>
  </div>
</body>
​
<script>
  setInterval(function(){
    const leftPosition = Math.round(Math.random() * 60);
    d3.selectAll('.pattern')
      .transition().duration(600)
      .attr('d', (d, i) => getPath(d, i, leftPosition))
  }, 1200)
​
​
  function getPath(d, index, leftPosition) {
    const rightPosition = 60 - leftPosition;
    const flatWidth = 10;
​
    const firstPath = `M0 30,${rightPosition - flatWidth} 60,${rightPosition} 60,60 30,${rightPosition} 0,${rightPosition - flatWidth} 0,0 30`;
    const secondPath = `M60 30,${leftPosition + flatWidth} 60,${leftPosition} 60,0 30,${leftPosition} 0,${leftPosition + flatWidth} 0,60 30`;
    if (index === 0){
      return firstPath;
    } else {
      return secondPath
    }
  }
​
</script>
    