import { scaleLinear, scaleTime, max, extent, bin, timeMonths, sum, timeFormat, brushX, select, } from 'd3'; import { AxisBottom } from './AxisBottom'; import { AxisLeft } from './AxisLeft'; import { Marks } from './Marks'; import { useRef, useEffect, useMemo } from 'react'; const margin = { top: 0, right: 30, bottom: 20, left: 45, }; const xAxisLabelOffset = 50; const yAxisLabelOffset = 30; //xValue moved to index const xAxisLabel = 'Time'; const yValue = (d) => d['Total Dead and Missing']; const yAxisLabel = 'Total Dead and Missing'; const xAxisTickFormat = timeFormat('%d/%m/%Y'); export const DateHistogram = ({ data, width, height, setBrushExtent, xValue, }) => { const brushref = useRef(); const innerHeight = height - margin.top - margin.bottom; const innerWidth = width - margin.left - margin.right; const xScale = useMemo( () => scaleTime() .domain(extent(data, xValue)) .range([0, innerWidth]), [data, xValue, innerWidth] ); const binnedData = useMemo(() => { const [start, stop] = xScale.domain(); return bin() .value(xValue) .domain(xScale.domain()) .thresholds(timeMonths(start, stop))(data) .map((array) => ({ totalDeadAndMissing: sum(array, yValue), x0: array.x0, x1: array.x1, })); }, [xValue, xScale, data, yValue]); const yScale = useMemo(() => scaleLinear() .domain([ 0, max(binnedData, (d) => d.totalDeadAndMissing), ]) .range([innerHeight, 0]), [binnedData, innerHeight] ); useEffect(() => { const brush = brushX().extent([ [0, 0], [innerWidth, innerHeight], ]); brush(select(brushref.current)); brush.on('brush end', ({ selection }) => { setBrushExtent( selection && selection.map(xScale.invert) ); }); /*brush.on('end', ({selection})=>{ if(!selection) setBrushExtent(null); }); removed bc simplified above */ }, [innerWidth, innerHeight]); return ( <> {xAxisLabel} {yAxisLabel} ); };

Missing migrants with brushing

surikmeetr