Timetables

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.3/d3.min.js"></script>
  
  <title>JS Bin</title>
</head>
<body>

var margin = {
  top: 20,
  right: 20,
  bottom: 40,
  left: 30
}
var fullWidth = 200
var fullHeight = 400
var width = fullWidth - margin.left - margin.right
var height = fullHeight - margin.top - margin.bottom  
  
d3.json('shop.json', function(tt_list) {
  
var data = tt_list[20]

var nempl = data.sol[0].length
var nslots = data.sol.length

var xExtent = [0, nempl]
var yExtent = [0, nslots]

var xScale = d3.scaleLinear()
  .domain(xExtent)
  .range([0, width])

console.log(xScale(4))

var yScale = d3.scaleLinear()
  .domain(yExtent)
  .range([0, height])

var color = d3.scaleLinear()
  .domain([0, 1])
  .range(['white', 'green'])

var svg = d3.select('body')
  .append('svg')
  .attr('width', fullWidth)
  .attr('height', fullHeight)
  .append('g')
  .attr('transform',
        'translate(' +
        margin.left + ',' +
        margin.top +
        ')')

var axisX = d3.axisTop(xScale)
    .ticks(nempl)

svg
  .append('g')
  .call(axisX)

var axisY = d3.axisLeft(yScale)
  .ticks(nslots)

svg
  .append('g')
  .call(axisY)

var row_groups = svg
  .append('g')
  .selectAll('g')
  .data(data.sol)
  .enter()
  .append('g')

var rect_width = xScale(1) - xScale(0)
var rect_height = yScale(1) - yScale(0)

var text = 
  svg
	.append('g')
	.attr('transform', 'translate('+ width / 2 +',' + height + ')')
	.append('text')
		.text('cost: '+ data.cost)
		.attr('dy', 15)
		.attr('text-anchor', 'middle')

})
</script>

</body>

https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.3/d3.min.js