ZoomIV_red/bue_dots

forked from nohevog1's block: ZoomIV_red/bue_dots

<!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 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>

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