// Generated by CoffeeScript 1.10.0
(function() {
  var GOSPER_ANGLE, INITIAL_SCALE, data, get_hept_coords, get_hex_data, height, rec, svg, vis, width;

  width = 960;

  height = 500;

  data = [];

  INITIAL_SCALE = height / 2.4;

  GOSPER_ANGLE = Math.acos(5 * Math.sqrt(7) / 14) / Math.PI * 180;

  svg = d3.select('svg').attr({
    width: width,
    height: height,
    viewBox: (-width / 2) + " " + (-height / 2) + " " + width + " " + height
  });

  vis = svg.append('g');

  get_hept_coords = function(scale, index) {
    var a, coords, r;
    a = scale / Math.sqrt(7);
    r = a / Math.sin(Math.PI / 3);
    coords = [
      {
        x: -a,
        y: r + r / 2
      }, {
        x: a,
        y: r + r / 2
      }, {
        x: 0,
        y: 0
      }, {
        x: -2 * a,
        y: 0
      }, {
        x: -a,
        y: -r - r / 2
      }, {
        x: a,
        y: -r - r / 2
      }, {
        x: 2 * a,
        y: 0
      }
    ];
    return coords[index];
  };


  /* Returns the rotation, translation and scale of a certain hexagon described as a base 7 number
   */

  get_hex_data = function(indexes) {
    var hept_coords, i, index, j, len, rotation, scale, scale_i, translation;
    rotation = GOSPER_ANGLE * indexes.length;
    translation = {
      x: 0,
      y: 0
    };
    scale = 1 / Math.pow(Math.sqrt(7), indexes.length);
    for (i = j = 0, len = indexes.length; j < len; i = ++j) {
      index = indexes[i];
      scale_i = 1 / Math.pow(Math.sqrt(7), i);
      hept_coords = get_hept_coords(scale_i, index);
      hept_coords = hept_tree_utils.rotate_point(hept_coords, GOSPER_ANGLE * (i + 1));
      translation.x += hept_coords.x;
      translation.y += hept_coords.y;
    }
    return {
      rotation: rotation,
      translation: translation,
      scale: scale
    };
  };

  rec = function(order, index) {
    var i, j, results;
    if (order === 0) {
      data.push(get_hex_data(index));
      return;
    }
    data.push(get_hex_data(index));
    results = [];
    for (i = j = 0; j <= 6; i = ++j) {
      results.push(rec(order - 1, index.concat([i])));
    }
    return results;
  };

  rec(Math.floor(Math.random() * 5), []);

  vis.selectAll('path').data(data).enter().append('path').attr({
    "class": 'hex',
    d: function(d) {
      return hept_tree_utils.hex_generate_svg_path(d.scale * INITIAL_SCALE, 0);
    },
    transform: function(d) {
      return "translate(" + (d.translation.x * INITIAL_SCALE) + ", " + (d.translation.y * INITIAL_SCALE) + ") rotate(" + d.rotation + ")";
    }
  });

}).call(this);