nohevog1/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    Built with blockbuilder.org

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

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

var points = d3.range(2000).map(phyllotaxis(10));

var circle = svg.selectAll("circle")
    .data(points)
  	.enter().append("circle")
    .attr("transform", function(d) { return "translate(" + d[0] + "," + d[1] + ")"; })
    .attr("r", 2.5);

svg.append("rect")
    .attr("width", width)
    .attr("height", height)
    .style("fill", "none")
    .style("pointer-events", "all")
    .call(d3.zoom()
        .scaleExtent([1 / 2, 4])
        .on("zoom", zoomed));

function zoomed() {
  var transform = d3.event.transform;
  circle
  	.style('fill', function(d, i){return i % 2 ? 'red':'blue';})
    .attr("transform", function(d) {
    return "translate(" + transform.applyX(d[0]) + "," + transform.applyY(d[1]) + ")";
  });
}

function phyllotaxis(radius) {
  var theta = Math.PI * (3 - Math.sqrt(5));
  return function(i) {
    var r = radius * Math.sqrt(i), a = theta * i;
    return [
      width / 2 + r * Math.cos(a),
      height / 2 + r * Math.sin(a)
    ];
  };
}

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<svg width="960" height="500"></svg>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script>

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

	var points = d3.range(2000).map(phyllotaxis(10));

	var circle = svg.selectAll("circle")
	.data(points)
	.enter().append("circle")
	.attr("transform", function(d) { return "translate(" + d[0] + "," + d[1] + ")"; })
	.attr("r", 2.5);

	svg.append("rect")
	.attr("width", width)
	.attr("height", height)
	.style("fill", "none")
	.style("pointer-events", "all")
	.call(d3.zoom()
	.scaleExtent([1 / 2, 4])
	.on("zoom", zoomed));

	function zoomed() {
	var transform = d3.event.transform;
	circle
	.style('fill', function(d, i){return i % 2 ? 'red':'blue';})
	.attr("transform", function(d) {
	return "translate(" + transform.applyX(d[0]) + "," + transform.applyY(d[1]) + ")";
	});
	}

	function phyllotaxis(radius) {
	var theta = Math.PI * (3 - Math.sqrt(5));
	return function(i) {
	var r = radius * Math.sqrt(i), a = theta * i;
	return [
	width / 2 + r * Math.cos(a),
	height / 2 + r * Math.sin(a)
	];
	};
	}

	</script>