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

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61.19% Branches 41/67
60% Functions 12/20
15.22% Lines 7/46
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     import d3 from 'd3';
    import Geo from '../Geo';
    import VisComponent from '../../VisComponent';
    import { minmax } from '../../util';

    export default class GeoDots extends VisComponent {
      static get options () {
        return [
          {
            name: 'data',
            type: 'table',
            format: 'objectlist'
          },
          {
            name: 'latitude',
            type: 'string',
            format: 'text',
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['number']
            }
          },
          {
            name: 'longitude',
            type: 'string',
            format: 'text',
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['number']
            }
          },
          {
            name: 'color',
            type: 'string',
            format: 'text',
            optional: true,
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['string', 'date', 'number', 'integer', 'boolean']
            }
          },
          {
            name: 'size',
            type: 'string',
            format: 'text',
            optional: true,
            domain: {
              mode: 'field',
              from: 'data',
              fieldTypes: ['number', 'integer', 'boolean']
            }
          }
        ];
      }

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

        let width = options.width || 600;
        let height = options.height || 600;

        el.style.width = width + 'px';
        el.style.height = height + 'px';

        let sizeTransform = 5;
        if (options.size) {
          const range = minmax(options.data.map(d => d[options.size]));
          const scale = d3.scale.linear()
            .domain([range.min, range.max])
            .range([3, 19]);

          sizeTransform = d => scale(d[options.size]);
        }

        let fillTransform = 'red';
        let strokeTransform = 'darkred';
        if (options.color && options.data.length > 0) {
          let fillScale, strokeScale;

          const type = typeof options.data[0][options.color];
          if (type === undefined || type === 'string') {
            fillScale = d3.scale.category10();
            strokeScale = 'black';
          } else {
            const range = minmax(options.data.map(d => d[options.color]));

            const red = d3.rgb('#ef6a62');
            const blue = d3.rgb('#67a9cf');
            const darkred = red.darker();
            const darkblue = blue.darker();

            fillScale = d3.scale.linear()
              .domain([range.min, range.max])
              .range([red, blue]);

            strokeScale = d3.scale.linear()
              .domain([range.min, range.max])
              .range([darkred, darkblue]);
          }

          fillTransform = d => fillScale(d[options.color]);
          if (strokeScale === 'black') {
            strokeTransform = 'black';
          } else {
            strokeTransform = d => strokeScale(d[options.color]);
          }
        }

        // TODO(choudhury): don't mutate the options object directly.
        options.layers = [];
        if (options.tileUrl !== null) {
          options.layers.push({
            type: 'osm',
            url: options.tileUrl
          });
        }

        options.layers.push({
          type: 'feature',
          features: [
            {
              name: 'feature1',
              type: 'point',
              x: options.longitude,
              y: options.latitude,
              style: {
                radius: sizeTransform,
                fillColor: fillTransform,
                strokeColor: strokeTransform
              },
              data: options.data
            }
          ]
        });

        options.center = options.center || {};
        const center = {
          x: options.center.longitude || 0.0,
          y: options.center.latitude || 0.0
        };

        const map_options = Object.assign({
          map: {
            zoom: options.zoom,
            center: center
          }
        }, options);

        this.geojs = new Geo(this.el, map_options);
      }

      render () {
        this.geojs.render();
      }
    }