mbostock/.block

## .block
license: gpl-3.0

## README.md

      
        

                
      Raw
    
  

        
        
          
            
          
          
            
              README.md
            
          
        
      
      
    Computing hexbins from a fluctuating sample of 2,000 random points.

  

  

## index.html
<!DOCTYPE html>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-hexbin.v0.2.min.js"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var delta = 0.001,
    i = 0, j,
    n = 2000, // Total number of random points.
    k = 20; // Number of points to replace per frame.

var rx = d3.randomNormal(width / 2, 80),
    ry = d3.randomNormal(height / 2, 80),
    points = d3.range(n).map(function() { return [rx(), ry()]; });

var color = d3.scaleSequential(d3.interpolateLab("white", "steelblue"))
    .domain([0, 20]);

var hexbin = d3.hexbin()
    .radius(20)
    .extent([[0, 0], [width, height]]);

var hexagon = svg.selectAll("path")
  .data(hexbin(points))
  .enter().append("path")
    .attr("d", hexbin.hexagon(19.5))
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    .attr("fill", function(d) { return color(d.length); });

d3.timer(function(elapsed) {
  rx = d3.randomNormal(width / 2 + 80 * Math.cos(elapsed * delta), 80),
  ry = d3.randomNormal(height / 2 + 80 * Math.sin(elapsed * delta), 80);
  for (j = 0; j < k; ++j, i = (i + 1) % n) points[i][0] = rx(), points[i][1] = ry();

  hexagon = hexagon
    .data(hexbin(points), function(d) { return d.x + "," + d.y; });

  hexagon.exit().remove();

  hexagon = hexagon.enter().append("path")
      .attr("d", hexbin.hexagon(19.5))
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    .merge(hexagon)
      .attr("fill", function(d) { return color(d.length); });
});

</script>

## preview.jpg

      
        

                
      Raw
    
  

        
        
          
            
          
          
            
              preview.jpg
            
          
        
      
    
    

        
            
        
    

  

## thumbnail.png

      
        

                
      Raw
    
  

        
        
          
            
          
          
            
              thumbnail.png
	<!DOCTYPE html>
	<svg width="960" height="500"></svg>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://d3js.org/d3-hexbin.v0.2.min.js"></script>
	<script>

	var svg = d3.select("svg"),
	width = +svg.attr("width"),
	height = +svg.attr("height");

	var delta = 0.001,
	i = 0, j,
	n = 2000, // Total number of random points.
	k = 20; // Number of points to replace per frame.

	var rx = d3.randomNormal(width / 2, 80),
	ry = d3.randomNormal(height / 2, 80),
	points = d3.range(n).map(function() { return [rx(), ry()]; });

	var color = d3.scaleSequential(d3.interpolateLab("white", "steelblue"))
	.domain([0, 20]);

	var hexbin = d3.hexbin()
	.radius(20)
	.extent([[0, 0], [width, height]]);

	var hexagon = svg.selectAll("path")
	.data(hexbin(points))
	.enter().append("path")
	.attr("d", hexbin.hexagon(19.5))
	.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
	.attr("fill", function(d) { return color(d.length); });

	d3.timer(function(elapsed) {
	rx = d3.randomNormal(width / 2 + 80 * Math.cos(elapsed * delta), 80),
	ry = d3.randomNormal(height / 2 + 80 * Math.sin(elapsed * delta), 80);
	for (j = 0; j < k; ++j, i = (i + 1) % n) points[i][0] = rx(), points[i][1] = ry();

	hexagon = hexagon
	.data(hexbin(points), function(d) { return d.x + "," + d.y; });

	hexagon.exit().remove();

	hexagon = hexagon.enter().append("path")
	.attr("d", hexbin.hexagon(19.5))
	.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
	.merge(hexagon)
	.attr("fill", function(d) { return color(d.length); });
	});

	</script>