custom spiral gui

forked from georules's block: oh yes spiral

forked from georules's block: custom spiral gui

<!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>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5.1/dat.gui.js"></script>
  </head>

<body>
    <script>
      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)
        x = Math.cos(rad)*d + p.x
        y = Math.sin(rad)*d + p.y
        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:394, y:226}
    
      var gui = new dat.GUI()
      var opts = {
        interpolate : "linear",
        theta : 89
      }
      
      var makeLineData = function() {
        lineData = []
        d = 5
        theta = -1
        p = {x:394, y:226}
        for (i = 0; i < 60; i+=1) {
          p = nextPoint(p, d, theta)
          lineData.push(p)
          theta += opts.theta
          d += 5
        }
      }
      makeLineData()
      
      gui.add(opts, "interpolate", ['linear', 'linear-closed', 'step', 
                                    'step-before', 'step-after', 'basis', 
                                    'basis-open', 'basis-closed', 'bundle',
                                   	'cardinal', 'cardinal-open','cardinal-closed',
                                   	'monotone'] );
      gui.add(opts, "theta")
      
      var drawLine = function() {
      	console.log(opts.interpolate)
        svg.selectAll("*").remove()
        var lineFunction = d3.svg.line()
                           .x(function(d) { return d.x; })
                           .y(function(d) { return d.y; })
                           .interpolate(opts.interpolate);

var lineGraph = svg.append("path")
                              .attr("d", lineFunction(lineData))
                              .attr("stroke", "#98ca34")
                              .attr("stroke-width", 1)
                              .attr("fill", "none");
      }
      drawLine()
      Object.observe(opts, function(c) {
        if (c.name === "interpolate") {
        	drawLine()
        }
        else {
          makeLineData()
          drawLine()
        }
      })
      
    </script>
  </body>

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

https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5.1/dat.gui.js