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history-counters.js
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history-counters.js
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/**
* Copyright (C) 2019 The Software Heritage developers
* See the AUTHORS file at the top-level directory of this distribution
* License: GNU Affero General Public License version 3, or any later version
* See top-level LICENSE file for more information
*/
import './history-counters.css';
export async function drawHistoryCounterGraph(container, historyData) {
const d3 = await import(/* webpackChunkName: "d3" */ 'utils/d3');
// remove previously created histogram and tooltip if any
d3.select(container).select('svg').remove();
d3.select(`${container}-tooltip`).remove();
// histogram size and margins
let width = 400;
let height = 300;
const margin = {top: 20, right: 50, bottom: 70, left: 30};
// create responsive svg
const svg = d3.select(container)
.attr('style',
`padding-bottom: ${Math.ceil(height * 100 / width)}%`)
.append('svg')
.attr('viewBox', `0 0 ${width} ${height}`);
// create tooltip div
const tooltip = d3.select('body')
.append('div')
.attr('class', 'd3-tooltip')
.attr('id', `${container}-tooltip`)
.style('opacity', 0);
// update width and height without margins
width = width - margin.left - margin.right;
height = height - margin.top - margin.bottom;
// Make sure data points are sorted, by x coordinate then y coordinate.
historyData.sort(function(a, b) {
return a[0] - b[0] !== 0 ? a[0] - b[0] : a[1] - b[1];
});
const firstPoint = historyData[0];
const lastPoint = historyData[historyData.length - 1];
// create main svg group element
const g = svg.append('g')
.attr('transform', `translate(${margin.left}, ${margin.top})`);
// create x scale
const xScale = d3.scaleTime()
.rangeRound([0, width])
.domain([firstPoint[0], lastPoint[0]])
.nice();
// create y scale
const yScale = d3.scaleLinear()
.range([height, 0])
.domain([firstPoint[1], lastPoint[1]])
.nice();
// create line generator
const line = d3.line()
.x(d => xScale(d[0]))
.y(d => yScale(d[1]));
// utility functions
const dateFormatter = d3.timeFormat('%d %b %Y');
const valueFormatter = (v) => {
return d3.format('.3s')(v).replace(/G/, 'B');
};
const bisectDate = d3.bisector(d => d[0]).left;
// add x axis
g.append('g')
.attr('class', 'axis')
.attr('transform', `translate(0, ${height})`)
.call(
d3.axisBottom(xScale)
.ticks(10)
.tickFormat(dateFormatter)
)
.selectAll('text')
.style('text-anchor', 'end')
.attr('dx', '-.8em')
.attr('dy', '.15em')
.attr('transform', 'rotate(-65)');
// add y axis
g.append('g')
.attr('class', 'axis')
.attr('transform', `translate(${width}, 0)`)
.call(
d3.axisRight(yScale)
.ticks(10)
.tickFormat(valueFormatter)
);
// add data plot
g.append('path')
.datum(historyData)
.attr('class', 'swh-history-counter-line')
.attr('d', line);
// add tooltip
const focus = g.append('g')
.attr('class', 'swh-history-counter-focus')
.style('display', 'none');
focus.append('circle')
.attr('r', 8);
g.append('rect')
.attr('class', 'swh-history-counter-overlay')
.attr('width', width)
.attr('height', height)
.on('mouseover', function(event) {
focus.style('display', null);
updateTooltip(event);
tooltip.transition()
.duration(200)
.style('opacity', 1);
})
.on('mouseout', () => {
focus.style('display', 'none');
tooltip.transition()
.duration(200)
.style('opacity', 0);
})
.on('mousemove', function(event) {
updateTooltip(event);
});
function updateTooltip(event) {
const x0 = xScale.invert(d3.pointer(event)[0]);
const i = bisectDate(historyData, x0, 1);
if (i >= historyData.length) return;
const d0 = historyData[i - 1];
const d1 = historyData[i];
const d = x0 - d0[0] > d1[0] - x0 ? d1 : d0;
focus.attr('transform', `translate(${xScale(d[0])}, ${yScale(d[1])})`);
const tooltipText = `${dateFormatter(d[0])} ${valueFormatter(d[1])}`;
tooltip.html(tooltipText)
.style('left', event.pageX + 15 + 'px')
.style('top', event.pageY + 'px');
}
}

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