rects.js

  const src = 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  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  const img = document.createElement('img');
  img.addEventListener('load', (e) => {
    canvas.width = img.naturalWidth;
    canvas.height = img.naturalHeight;
    ctx.drawImage(img, 0, 0);
    draw(img);
  });
  img.src = src;

  const colors = [
    '#ebedf0',
    '#c6e48b',
    '#7bc96f',
    '#239a3b',
    '#196127',
  ]

  function draw() {
    const data = ctx.getImageData(0,0,canvas.width, canvas.height);

    const weeks = document.querySelectorAll('svg g g');

    for(let x=0; x<weeks.length; x++) {
      const week = weeks[x];
      const days = week.querySelectorAll('rect');
      for(let y=0; y<days.length; y++) {
        const ptr = y * canvas.width * 4 + x * 4;
        const l =255- data.data[ptr];
        const al = Math.floor(l*colors.length/255);
        const c = colors[al];
        const day = days[y];
        day.setAttributeNS(null, 'fill', `${c}`);   
      }
    }
  }

intermittent coding

const colors = [
  '#c6e48b',
  '#7bc96f',
  '#239a3b',
  '#196127'
]
const weeks = document.querySelectorAll('svg g g');

for(let x=0; x<weeks.length; x++) {
  const week = weeks[x];
  const days = week.querySelectorAll('rect');
  const work = x % 2;
  for(let y=0; y<days.length; y++) {
    const color = work ? '#ebedf0' : colors[ Math.floor( Math.random() * colors.length ) ];
    const day = days[y];
    day.setAttributeNS(null, 'fill', `${color}`);   
  }
}

Water coding

const width = 54;
const height = 7;

const canvas1 = document.createElement('canvas');
canvas1.width = width;
canvas1.height = height;
const ctx1 = canvas1.getContext('2d');

const canvas2 =  document.createElement('canvas');
canvas2.width = width;
canvas2.height = height;
const ctx2 = canvas2.getContext('2d');

const canvas = [canvas1,canvas2];
const ctxs = [ctx1,ctx2];

for(const c of ctxs) {
  c.fillStyle = '#000';
  c.fillRect(0,0,width, height);
}

let cPtr = 0;

  const colors = [
    '#ebedf0',
    '#c6e48b',
    '#7bc96f',
    '#239a3b',
    '#196127',
  ]

const map = new Map();

function generateMap() {
  const weeks = document.querySelectorAll('svg g g');

  for(let x=0; x<weeks.length; x++) {
    const week = weeks[x];
    const days = week.querySelectorAll('rect');
    for(let y=0; y<days.length; y++) {
      map.set(days[y], {x,y});
    }
  }

}

generateMap();

function draw() {
  const cv = canvas[cPtr];
  const data = ctxs[cPtr].getImageData(0,0,cv.width, cv.height);
  for(const [key,value] of map.entries()) {
    const ptr = value.y * cv.width * 4 + value.x * 4;
    const l =  data.data[ptr];
    const al = Math.floor(l*colors.length/255);
    const c = colors[al];
    key.setAttributeNS(null, 'fill', `${c}`);   
  }
  
}

const svg = document.querySelector('.js-calendar-graph-svg');
svg.addEventListener('mousemove', (e) =>{
  if(e.target instanceof SVGRectElement) {
    const el = map.get(e.target);
    if(el) {
      const ctx = ctxs[cPtr];
      ctx.fillStyle = 'white';
      ctx.fillRect(el.x,el.y,1,1);
    }
  }
})

function animate() {

  let pixel = 0;
  let src = ctxs[cPtr].getImageData(0,0,width, height);
  let dst = ctxs[1-cPtr].getImageData(0,0,width, height);
  
  const padding = 0;
  const w = width * 4;
  for (let y = padding; y < height - padding; y++) {
    for (let x = padding; x < width - padding; x++) {
      const ptr = y * width *4 + x *4;
      let pixel = ((src.data[ptr - 4] + src.data[ptr + 4] + src.data[ptr - w] + src.data[ptr + w]) >> 1) - dst.data[ptr];
      pixel -= pixel >> 20; 
      pixel = pixel > 255 ? 255 : pixel < 0 ? 0 : pixel;
      dst.data[ptr] = pixel;
    }
  }

  ctxs[1-cPtr].putImageData(dst, 0, 0);

    draw();
    cPtr = 1 - cPtr;
    requestAnimationFrame(animate);
}

animate();
document.body.append(canvas1);document.body.append(canvas2);

var sheet = window.document.styleSheets[0];
sheet.insertRule('.svg-tip { visibility: hidden; }', sheet.cssRules.length);