SmoothieChart.prototype.updateValueRange = function()

in notebooks/iot_greengress/health_tracker/tracker/ggd/flask/static/smoothie.js [493:542]
38 lines of code
12 McCabe index (conditional complexity)

  SmoothieChart.prototype.updateValueRange = function() {
    // Calculate the current scale of the chart, from all time series.
    var chartOptions = this.options,
        chartMaxValue = Number.NaN,
        chartMinValue = Number.NaN;

    for (var d = 0; d < this.seriesSet.length; d++) {
      // TODO(ndunn): We could calculate / track these values as they stream in.
      var timeSeries = this.seriesSet[d].timeSeries;
      if (!isNaN(timeSeries.maxValue)) {
        chartMaxValue = !isNaN(chartMaxValue) ? Math.max(chartMaxValue, timeSeries.maxValue) : timeSeries.maxValue;
      }

      if (!isNaN(timeSeries.minValue)) {
        chartMinValue = !isNaN(chartMinValue) ? Math.min(chartMinValue, timeSeries.minValue) : timeSeries.minValue;
      }
    }

    // Scale the chartMaxValue to add padding at the top if required
    if (chartOptions.maxValue != null) {
      chartMaxValue = chartOptions.maxValue;
    } else {
      chartMaxValue *= chartOptions.maxValueScale;
    }

    // Set the minimum if we've specified one
    if (chartOptions.minValue != null) {
      chartMinValue = chartOptions.minValue;
    } else {
      chartMinValue -= Math.abs(chartMinValue * chartOptions.minValueScale - chartMinValue);
    }

    // If a custom range function is set, call it
    if (this.options.yRangeFunction) {
      var range = this.options.yRangeFunction({min: chartMinValue, max: chartMaxValue});
      chartMinValue = range.min;
      chartMaxValue = range.max;
    }

    if (!isNaN(chartMaxValue) && !isNaN(chartMinValue)) {
      var targetValueRange = chartMaxValue - chartMinValue;
      var valueRangeDiff = (targetValueRange - this.currentValueRange);
      var minValueDiff = (chartMinValue - this.currentVisMinValue);
      this.isAnimatingScale = Math.abs(valueRangeDiff) > 0.1 || Math.abs(minValueDiff) > 0.1;
      this.currentValueRange += chartOptions.scaleSmoothing * valueRangeDiff;
      this.currentVisMinValue += chartOptions.scaleSmoothing * minValueDiff;
    }

    this.valueRange = { min: chartMinValue, max: chartMaxValue };
  };