# all files / candela/components/TrackerDash/ TrendPane.js

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65.96% Branches 31/47
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     import _ from 'underscore';
    import $ from 'jquery';
    import nv from 'nvd3';
    import d3 from 'd3';

    import { deArray } from './utility.js';

    import trendPane from './templates/trendPane.jade';
    import VisComponent from '../../VisComponent';

    class TrendPane extends VisComponent {
      constructor (el, settings) {
        super(el);
        this.$el = $(this.el);

        this.bins = settings.bins || 10;
        this.trendMap = settings.trendMap;
        this.hists = this._calculateHistograms(settings.trendValuesByDataset, settings.histogram_max_x);
      }

      _calculateHistograms (trends, maxX) {
        const bins = this.bins;
        const byTrend = _.groupBy(trends, 'trend');

        const min = _.reduce(trends, (memo, num) => {
          let current = deArray(num.current, d3.min);
          return Math.min(memo, current);
        }, 0);  // we want 0 to be the min

        const maxXSet = !_.isNaN(parseFloat(maxX));
        let max;
        let binWidth;
        if (maxXSet) {
          // We have a maximum set, put everything beyond this max
          // in the same 'Beyond' bin.
          max = parseFloat(maxX);
          binWidth = (max - min) / (bins - 1);
        } else {
          max = _.reduce(trends, (memo, num) => {
            return Math.max(memo, deArray(num.current, d3.max));
          }, 0);
          binWidth = (max - min) / bins;
        }

        let hists = _.map(byTrend, (element, key) => {
          let el = {trend: this.trendMap[key].display_name};
          el['values'] = _.countBy(_.map(element, (value) => {
            let current = deArray(value.current, d3.median);
            let res = Math.floor(current / binWidth);
            if (maxXSet) {
              if (res > bins - 1) {
                res = bins - 1;
              }
            } else {
              if (res > bins) {
                res = bins;
              }
            }
            return res;
          }), (num) => { return num; });
          return el;
        }, this);

        hists = _.indexBy(hists, 'trend');
        this.xLabels = [];
        this.xLabels.push(binWidth / 2);
        for (let i = 1; i < bins; ++i) {
          this.xLabels.push(this.xLabels[i - 1] + binWidth);
        }
        this.xLabels = _.map(this.xLabels, (value) => {
          return value.toFixed(1);
        });
        if (maxXSet) {
          this.xLabels[this.xLabels.length - 1] = 'Beyond';
        }
        return hists;
      }

      getChartData () {
        // Prepare the data for plotting
        let plotData = [];
        const trends = _.keys(this.hists);
        for (let i = 0; i < trends.length; ++i) {
          const trend = trends[i];
          let curData = { key: trend.toUpperCase() };
          curData.values = [];
          for (let j = 0; j < this.bins; ++j) {
            curData.values.push({ x: this.xLabels[j], y: this.hists[trend].values[j] || 0 });
          }
          plotData.push(curData);
        }
        return plotData;
      }

      createChart () {
        nv.addGraph({
          generate: _.bind(function () {
            let parent = $('.trend-pane');
            let width = parent.width();
            let height = parent.height();
            let chart = nv.models.multiBarChart()
              .reduceXTicks(false)
              .width(width)
              .height(height)
              .stacked(false);
            chart.xAxis.axisLabel('Key metric values (bin center)');
            chart.xAxis.tickValues(this.xLabels);
            chart.yAxis.axisLabel('Number of Runs');
            chart.yAxis.tickFormat(d3.format('d'));
            chart.tooltip.enabled(false);

            let svg = d3.select('.trend-chart svg').datum(this.getChartData());
            svg.transition().duration(0).call(chart);
            return chart;
          }, this),
          callback: function (graph) {
            nv.utils.windowResize(function () {
              let parent = $('.trend-pane');
              let width = parent.width();
              let height = parent.height();
              graph.width(width).height(height);

              d3.select('.trend-chart svg')
                .attr('width', width)
                .attr('height', height)
                .transition().duration(0)
                .call(graph);
            });
          }
        });
      }

      render () {
        this.$el.html(trendPane());
        this.createChart();
      }
    }

    export default TrendPane;