Function d3_time_scale

explainshell/web/static/js/d3.v3.js:8292–8329

(linear, methods, format)

  d3.time.months = d3.time.month.range;
  d3.time.months.utc = d3.time.month.utc.range;
  function d3_time_scale(linear, methods, format) {
    function scale(x) {
      return linear(x);
    }
    scale.invert = function(x) {
      return d3_time_scaleDate(linear.invert(x));
    };
    scale.domain = function(x) {
      if (!arguments.length) return linear.domain().map(d3_time_scaleDate);
      linear.domain(x);
      return scale;
    };
    scale.nice = function(m) {
      return scale.domain(d3_scale_nice(scale.domain(), function() {
        return m;
      }));
    };
    scale.ticks = function(m, k) {
      var extent = d3_time_scaleExtent(scale.domain());
      if (typeof m !== "function") {
        var span = extent[1] - extent[0], target = span / m, i = d3.bisect(d3_time_scaleSteps, target);
        if (i == d3_time_scaleSteps.length) return methods.year(extent, m);
        if (!i) return linear.ticks(m).map(d3_time_scaleDate);
        if (Math.log(target / d3_time_scaleSteps[i - 1]) < Math.log(d3_time_scaleSteps[i] / target)) --i;
        m = methods[i];
        k = m[1];
        m = m[0].range;
      }
      return m(extent[0], new Date(+extent[1] + 1), k);
    };
    scale.tickFormat = function() {
      return format;
    };
    scale.copy = function() {
      return d3_time_scale(linear.copy(), methods, format);
    };
    return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
  }
  function d3_time_scaleExtent(domain) {
    var start = domain[0], stop = domain[domain.length - 1];
    return start < stop ? [ start, stop ] : [ stop, start ];