oh yes spiral fib

forked from georules's block: oh yes spiral

<!DOCTYPE html>
  <head>
    <meta charset="utf-8">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <style>
      body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
      svg { width: 100%; height: 100%; }
    </style>
  </head>

<body>
    <script>
      
           var  fib= function(n) {
      var fst = 1, sec = 1, add;
      for (var i = 0; i < n; i++) {
        add = fst + sec;
        fst = sec;
        sec = add;
      }
      return add;
    }
           
      var margin = {top: 20, right: 10, bottom: 20, left: 10};
      var width = 960 - margin.left - margin.right;
      var height = 500 - margin.top - margin.bottom;
      var svg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

console.log("you are now rocking with d3", d3);
      
      var nextPoint = function(p,d,theta) {
        rad = theta * Math.PI/180.0
        m = Math.tan(rad)
     		f = fib(p)
        x = f*Math.cos(p)+300//*100+300//Math.cos(rad)*d + p.x
        y = f*Math.sin(p)+300//*100+200
        return {x:x, y:y}
      }
      //https://upload.wikimedia.org/wikipedia/commons/7/72/Turtle-Graphics_Polyspiral.svg
      var lineData = []
      var theta = -1
      var d = 5;
      var p = {x:312, y:250}
      //lineData.push(p)
      for (i = 1; i < 12; i+=1) {
        p = nextPoint(p, d, theta)
        p = nextPoint(i,p,theta)
        lineData.push(p)
        theta -= 89.5
        d += 5
     	}

var lineFunction = d3.svg.line()
                         .x(function(d) { return d.x; })
                         .y(function(d) { return d.y; })
                         .interpolate("linear");
      
      var lineGraph = svg.append("path")
                            .attr("d", lineFunction(lineData))
                            .attr("stroke", "black")
                            .attr("stroke-width", 1)
                            .attr("fill", "none");
    </script>
  </body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js