D3 + Canvas demo

No data binding, no selection, just drawing using d3 + canvas.

forked from anonymous's block: D3 + Canvas demo

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <div class="container"></div>
  <script>
		var width = 500;
    var height = 420;
    
    var barw = 50;
    var barh = 50;
    
    // create a canvas element within our div.container
    var canvas = d3.select('.container')
    	.append('canvas')
    	.attr('width', width)
    	.attr('height', height);
    
    // a reference to our canvas' context, a "toolbox"
    var context = canvas.node().getContext('2d');
    
    
    // make some data
    //var data = [5, 40, 90, 500];
    var data = d3.range(1000).map(d => d);
    
    // create our x scale
    var x = d3.scaleLinear()
    	.range([10, width - 10])
    	.domain(d3.extent(data));
    
    // create our color scale
		var colorScale = d3.scaleSequential(d3.interpolateSpectral)
    	.domain(d3.extent(data));
    
    // loop over our data and draw on the canvas
    data.forEach((d, i) => {
      context.fillStyle = colorScale(d);
      context.fillRect(x(d), 10, 50, 50);
      
      if (d % 50 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 70, barw, barh);
      }
      
      if (d % 100 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 130, barw, barh);
      }
      
      if (d % 150 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 190, barw, barh);
      }
      
      if (d % 200 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 250, barw, barh);
      }
      
      if (d % 250 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 310, barw, barh);
      }
      
      if (d % 300 === 0) {
      	context.fillStyle = colorScale(d);
        context.fillRect(x(d), 370, barw, barh);
      }
    });

</script>
</body>

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

https://d3js.org/d3-scale-chromatic.v1.min.js