dotdensity.js

import { simple } from "./simple.js";
import { dissolve } from "../helpers/dissolve.js";
import { dotsinpolygons } from "../helpers/dotsinpolygons.js";
import { sum } from "d3-array";
const d3 = Object.assign({}, { sum });

export function dotdensity(
  selection,
  projection,
  options = {},
  clipid,
  width,
  height
) {
  let nbdots =
    options.nbdots != undefined
      ? options.nbdots
      : d3.sum(
          options.geojson.features.map((d) => +d.properties[options.values])
        ) / 1000;

  options.dotvalue = options.dotvalue != undefined ? options.dotvalue : nbdots;
  options.symbol_size =
    options.symbol_size != undefined ? options.symbol_size : 8;
  options.fill = options.fill ? options.fill : "#cc190c";
  options.leg_text = options.leg_text
    ? options.leg_text
    : `= ${options.dotvalue}`;
  options.leg_type = options.symbol ? options.symbol : "circle";

  let splited = dissolve(options.geojson);

  splited.features.forEach((d, i) => {
    d.properties.__value = +d.properties[options.values] * d.__share;
    d.__test = +d.properties[options.values] * d.__share;
  });

  const dots = dotsinpolygons(splited, "__value", options.dotvalue);

  options.geojson = JSON.parse(JSON.stringify(dots));
  options._type = "dotdensity";

  simple(selection, projection, options, clipid, width, height);
}