helpers.js

var linenb_class = function(d) { return "line_" + d; };

/********** STATION HELPERS ***********/

// Create the classes for a station
var station_classes = function(e) { 
  return "active station " + e.lines.map(linenb_class).join(" ");
};
var station_part_classes = function(d) {
  return "active station_part " + linenb_class(d.line);
}

// Create the transformation for stations
var transform = function(projection) {
  return function(d) {
    return "translate(" + projection([d.latitude, d.longitude]) + ")";
  };
};

// Create objects suitable for d3.svg.arc
var pie = d3.layout.pie()
                   .sort(null);

// Create an arc. Use the argument to create the radius
var draw_arc = function(d) {
  return d3.svg.arc()
    .innerRadius(0)
    .outerRadius(d.r)
    (d);
};

// Transform a station object into an object suitable for arc
var gen_pie = function(scale) {
  return function(d) {
    var res = pie(d.lines.map(function() { return 1; }));
    res.map(function(e, i) { 
      e["line"] = d.lines[i]; 
      e["r"] = scale(d.trafic);
      return e;
    });
    return res;
  };
};

var sort_stations = function(d1, d2) {
  return d1.trafic < d2.trafic;
}


/************ LINES ***************/
var line = d3.svg.line()
                 .interpolate("linear");


var draw_line = function(data, projection) {
  return function(d) {
    var points = d.paths.map(function(s) { 
      return projection([data.freq[s].latitude, data.freq[s].longitude]);
    });
    return line(points);
  };
};

var line_class = function(d) { 
  return "active line " + linenb_class(d.key);
}

var gen_branch = function(d) {
  return d.paths.map(function(p) { return {"key": d.key, "paths": p}; });
}

var branch_class = function(d) {
  return "active line_branch " + linenb_class(d.key);
}