// Generated by CoffeeScript 1.10.0
(function() {
  var defs, graticule, height, magnitude, path_generator, projection, sky, svg, width, zoom;

  svg = d3.select('svg');

  width = svg[0][0].getBoundingClientRect().width;

  height = svg[0][0].getBoundingClientRect().height;

  projection = d3.geo.berghaus().rotate([20, -90]).clipAngle(180 - 1e-3).scale(100).translate([width / 2, height * .55]).precision(.1);

  graticule = d3.geo.graticule().minorStep([15, 10]).majorStep([90, 10]);

  path_generator = d3.geo.path().projection(projection);

  defs = svg.append('defs');

  defs.append('path').datum({
    type: 'Sphere'
  }).attr('id', 'sphere').attr('d', path_generator);

  defs.append('clipPath').attr('id', 'clip').append('use').attr('xlink:href', '#sphere');

  sky = svg.append('g');

  sky.append('use').attr('class', 'stroke').attr('xlink:href', '#sphere');

  sky.append('use').attr('class', 'fill').attr('xlink:href', '#sphere');

  sky.append('path').datum(graticule).attr('class', 'graticule').attr('d', path_generator).attr('clip-path', 'url(#clip)');

  zoom = d3.behavior.zoom().scaleExtent([1, 20]).on('zoom', function() {
    return sky.attr('transform', "translate(" + (zoom.translate()) + ")scale(" + (zoom.scale()) + ")");
  });

  sky.call(zoom);

  magnitude = d3.scale.linear().domain([-1, 6]).range([8, 0]);

  d3.csv('stars.csv', function(data) {
    return sky.selectAll('.star').data(data).enter().append('circle').attr('class', 'star').attr('r', function(d) {
      return magnitude(+d.magnitude);
    }).attr('transform', function(d) {
      var lat, lon, ref, x, y;
      lat = +d.dec_deg + +d.dec_min / 60 + +d.dec_sec / 3600;
      lon = (+d.RA_hour + +d.RA_min / 60 + +d.RA_sec / 3600) * (360 / 24);
      ref = projection([-lon, lat]), x = ref[0], y = ref[1];
      return "translate(" + x + "," + y + ")";
    });
  });

  d3.select(self.frameElement).style('height', height + 'px');

}).call(this);