/* polar layout
*/


(function() {
  var RADIUS, arc_generator, bl, br, color, data, height, inner_radius_scale, max, pie, pies, polar, polar_data, polar_layout, radius_scale, rand2_6, side, svg, ul, ur, width;

  polar = function() {
    var angle, self;

    angle = null;
    self = function(data) {
      angle = 2 * Math.PI / data.length;
      data.forEach(function(d, i) {
        return d.angle = data.length > 2 ? i * angle : (i - 0.25) * angle;
      });
      return data;
    };
    self.angle = function() {
      return angle;
    };
    return self;
  };

  /* ---
  */


  rand2_6 = function() {
    return 2 + Math.round(Math.random() * 6);
  };

  data = d3.range(rand2_6()).map(function(d) {
    return {
      category: "cat_" + d,
      value: Math.random()
    };
  });

  console.log(data);

  max = d3.max(data, function(d) {
    return d.value;
  });

  width = 960;

  height = 500;

  side = Math.min(width, height);

  RADIUS = side / 4 - 20;

  polar_layout = polar();

  polar_data = polar_layout(data);

  console.log(polar_data);

  svg = d3.select("body").append("svg").attr("width", width).attr("height", height).append('g').attr({
    transform: "translate(" + (width / 2) + ", " + (height / 2) + ")"
  });

  ul = svg.append("g").attr({
    transform: "translate(" + (-side / 4) + ", " + (-side / 4) + ")"
  });

  ur = svg.append("g").attr({
    transform: "translate(" + (+side / 4) + ", " + (-side / 4) + ")"
  });

  bl = svg.append("g").attr({
    transform: "translate(" + (-side / 4) + ", " + (+side / 4) + ")"
  });

  br = svg.append("g").attr({
    transform: "translate(" + (+side / 4) + ", " + (+side / 4) + ")"
  });

  color = d3.scale.ordinal().range(["#1b9e77", "#d95f02", "#7570b3", "#e7298a", "#66a61e", "#e6ab02", "#a6761d", "#666666"]);

  pie = d3.layout.pie().sort(null).value(function(d) {
    return d.value;
  });

  arc_generator = d3.svg.arc().innerRadius(0).outerRadius(RADIUS);

  ul.selectAll('.arc').data(pie(data)).enter().append('path').attr({
    "class": 'arc',
    d: arc_generator,
    fill: function(d, i) {
      return color(i);
    }
  });

  radius_scale = d3.scale.linear().domain([0, max]).range([0, RADIUS]);

  inner_radius_scale = d3.scale.linear().domain([0, max]).range([RADIUS * 0.4, RADIUS]);

  arc_generator = d3.svg.arc().innerRadius(function(d) {
    return inner_radius_scale(max - d.value);
  }).outerRadius(function(d) {
    return radius_scale(max);
  }).startAngle(function(d) {
    return d.angle - polar_layout.angle() / 2;
  }).endAngle(function(d) {
    return d.angle + polar_layout.angle() / 2;
  });

  pies = ur.selectAll('.arc').data(polar_data);

  pies.enter().append('path').attr({
    "class": 'arc',
    d: arc_generator,
    fill: function(count, klass) {
      return color(klass);
    }
  });

  radius_scale = d3.scale.linear().domain([0, max]).range([0, RADIUS]);

  arc_generator = d3.svg.arc().innerRadius(0).outerRadius(function(d) {
    return radius_scale(d.value);
  }).startAngle(function(d) {
    return d.angle - polar_layout.angle() / 2;
  }).endAngle(function(d) {
    return d.angle + polar_layout.angle() / 2;
  });

  bl.selectAll('.arc').data(polar_data).enter().append('path').attr({
    "class": 'arc',
    d: arc_generator,
    fill: function(d, i) {
      return color(i);
    }
  });

  radius_scale = d3.scale.sqrt().domain([0, max]).range([0, RADIUS]);

  arc_generator = d3.svg.arc().innerRadius(0).outerRadius(function(d) {
    return radius_scale(d.value);
  }).startAngle(function(d) {
    return d.angle - polar_layout.angle() / 2;
  }).endAngle(function(d) {
    return d.angle + polar_layout.angle() / 2;
  });

  br.selectAll('.arc').data(polar_data).enter().append('path').attr({
    "class": 'arc',
    d: arc_generator,
    fill: function(d, i) {
      return color(i);
    }
  });

}).call(this);