cellxgene/src/components/continuous/util.js

import _ from "lodash";

const paddingRight = 120;
const continuousChartWidth = 1200;

export const margin = {top: 66, right: 110, bottom: 20, left: 60};
export const width = continuousChartWidth - margin.left - margin.right - paddingRight;
export const height = 340 - margin.top - margin.bottom;
export const innerHeight = height - 2;

export const devicePixelRatio = window.devicePixelRatio || 1;

export const createDimensions = (data) => {
  const newArr = []
  _.each(data, (value, key) => {
    if (value.range) {
      newArr.push({
        key: key, /* room for confusion: lodash calls this key, it's also the name of the property parallel coords code is looking for */
        type: {
          within: (d, extent, dim) => {
            return extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1];
          },
        },
        scale: d3.scaleSqrt().range([innerHeight, 0]).domain([0, value.range.max])
      })
    }
  })
  return newArr;
}

export const yAxis = d3.axisLeft();

export const brushstart = () => {
  d3.event.sourceEvent.stopPropagation();
}

export const d3_functor = (v) => {
  return typeof v === "function" ? v : () => { return v; };
};

export const project = (d, dimensions, xscale) => {
  return dimensions.map((p,i) => {
    // check if data element has property and contains a value
    if (
      !(p.key in d) ||
      d[p.key] === null
    ) return null;

    return [xscale(i),p.scale(d[p.key])];
  });
};