Munching Squares

Trying to implement a munching squares algorithm as mentioned in https://nbickford.wordpress.com/2011/04/03/the-minsky-circle-algorithm/

<!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; }
  </style>
</head>

<body>
  <script>
    const frameSize = 25;
    const cellSize = 10;
    let row = function() {return Array(frameSize).fill().map(() => Math.random())};
    let cellMatrix = Array(frameSize).fill(0);
    for (let i = 0; i< frameSize; i++) {
      cellMatrix[i] = row()
    }
    
    function update(frameNumber, cellMatrix) {
      frameNumber = frameNumber % (frameSize * 1.2)
      for(let i = 0; i < frameSize; i++) {
        for (let k = 0; k < frameSize; k++) {
//           console.log((i+1) ^ (k+1))
          if ((i ^ k) < frameNumber) {
            cellMatrix[i][k] = 1
          } else {
            cellMatrix[i][k] = 0
          }
        }
      }
      return cellMatrix
    }
    
    function updateCells(cellMatrix, rectsRow, cells) {
      rectsRow.data(cellMatrix)
      cells.selectAll('rect').data(cellMatrix);
      cells.merge(cells).attr('fill', d => d> 0.5? 'black': 'white')
      
    }
    
    // Feel free to change or delete any of the code you see in this editor!
    const svg = d3.select("body").append("svg")
      .attr("width", 800)
      .attr("height", 800)

function render(cellMatrix) {
      let rectsRow = svg.selectAll("g")
                  .data(cellMatrix)
      let rectsRowEnter = rectsRow
                  .enter().append('g')
    							.attr('class', 'cell-row');
      
      let cell = rectsRow.merge(rectsRowEnter)
        .attr('transform', (d, i) => `translate(0, ${i * cellSize})`)
      	.selectAll("rect")
        .data(d => {console.log(d); return d})

let cellEnter =	cell.enter().append('rect')
    										.attr('width', cellSize)
    										.attr('height', cellSize)
    										.attr('x', (k, i) => cellSize * i )
    										.attr('y', 0)
    	cell.merge(cellEnter).attr('fill', d => d> 0.5? 'black': 'white');
    }
    
    let counter = 0;
    render(cellMatrix);
//     d3.timeout(() => {
//       update(2, cellMatrix);
//       render(cellMatrix)
//     }, 100)
    d3.interval(() => {
      cellMatrix = update(counter, cellMatrix);
      render(cellMatrix);
      counter +=1;
    }, 500);
    
    
  </script>
</body>

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