# all files / candela/components/SurvivalPlot/ index.js

68.92% Statements 51/74
80.49% Branches 33/41
56.25% Functions 9/16
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     import VisComponent from '../../VisComponent';
    import VegaChart from '../../VisComponent/mixin/VegaChart';
    import spec from './spec.json';

    export default class SurvivalPlot extends VegaChart(VisComponent, spec) {
      static get options () {
        return [
          {
            name: 'data',
            type: 'table',
            format: 'objectlist'
          },
          {
            name: 'time',
            type: 'string',
            format: 'text',
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['number', 'integer']
            }
          },
          {
            name: 'censor',
            type: 'string',
            format: 'text',
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['integer', 'boolean']
            }
          },
          {
            name: 'group',
            type: 'string',
            format: 'text',
            optional: true,
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['string', 'date', 'number', 'integer', 'boolean']
            }
          }
        ];
      }

      constructor (el, options) {
        super(el, options);

        // Sort the events by time.
        options.data.sort((x, y) => x[options.time] - y[options.time]);

        // If there is no 'group' parameter, fake one up.
        if (!options.group) {
          options.group = 'group';
          options.data.forEach(d => d.group = 0);
        }

        // Collect the grouping values, and count how many belong to each group.
        let groups = {};
        options.data.forEach(d => {
          const key = d[options.group];
          if (!groups[key]) {
            groups[key] = {
              survivors: 1
            };
          }

          groups[key].survivors++;
        });

        // Append a dummy value to the start of the dataset, one per group.
        const dummies = Object.keys(groups).map(g => {
          let x = {
            time: 0
          };

          x[options.group] = g;

          return x;
        });
        options.data = [...dummies, ...options.data];

        // Compute the number of survivors at each event. A patient is assumed to
        // have not survived, unless the reason for the event is "right censoring"
        // (aka, censor == 1).
        options.data.forEach(d => {
          if (d[options.censor] !== 0) {
            groups[d[options.group]].survivors--;
          }
          d.survivors = groups[d[options.group]].survivors;
        });
      }
    }