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d3-line-chart-boilerplate.html
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d3-line-chart-boilerplate.html
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<!DOCTYPE html>
<meta charset=utf-8>
<style>
body {
margin: 0 auto;
padding: 1em;
max-width: 1000px;
}
svg text { font: 15px 'Liberation Sans', 'Luxi Sans', sans-serif; }
.axis text { fill: black; }
.line { fill: none; stroke: steelblue; stroke-width: 1.5px; }
.mark { stroke: red; }
.grid line { stroke: #ddd; }
.grid .domain { stroke: none; }
.overlay { fill: none; pointer-events: all; }
.focus circle { fill: none; stroke: steelblue; }
.focus tspan { paint-order: stroke; stroke: white; stroke-width: 10px; }
</style>
<body>
<script>
'use strict'
let d3js_ver = 7,
d3js_local_url = `d3.v${d3js_ver}.min.js`,
d3js_remote_load = true, // false = always use local copy
d3js_remote_url = `https://d3js.org/d3.v${d3js_ver}.min.js`,
d3js_remote_import = `https://cdn.jsdelivr.net/npm/d3@${d3js_ver}/+esm`,
d3js_loader = async () => {
if (window.d3) return window.d3
let res = await fetch(d3js_local_url).catch(res => res)
if (res.ok) { eval(await res.text()); return window.d3 }
if (!d3js_remote_load) return console.log(
`WARNING: Failed to load local d3.js`
+ ` [ ${d3js_local_url} ]: ${res.status} - ${res.statusText}` )
console.log(`WARNING: importing d3 from ${d3js_remote_import}`)
return await import(d3js_remote_import) }
window.onload = () => d3js_loader().then(d3 => {
if (!d3) return document.body.innerHTML = `
<h2>ERROR: failed to load d3.js library</h2>
<p>Check uMatrix/NoScript/adblocker setttings or download
<a href='${d3js_remote_url}'>${d3js_local_url}</a> into same dir as this html.</p>`
// Data
let data = [], offset = 0, offset_max = 3 * 3600 / 59
while (offset <= offset_max) {
let chance = 0.05, chance_neg = 1 - chance,
state = !data.length ? chance_neg : data[data.length-1].state * chance_neg
data.push({offset: offset, state: state})
offset += 1
}
// Basic d3 boilerplate
let
margin = {top: 50, right: 100, bottom: 50, left: 100},
width = 960 - margin.left - margin.right,
height = 700 - margin.top - margin.bottom,
x = d3.scaleLinear().range([0, width]),
y = d3.scaleLinear().range([height, 0])
let vis = d3.select('body')
.append('svg')
.attr('width', width + margin.left + margin.right)
.attr('height', height + margin.top + margin.bottom)
.append('g')
.attr('transform', `translate(${margin.left},${margin.top})`)
// Axes and chart
let kx = 'offset', ky = 'state',
line = d3.line().x(d => x(d[kx])).y(d => y(d[ky]))
let attrs = vals => s => { // set bunch of attributes from dict
Object.entries(vals).forEach(([k,v]) => s.attr(k, v)) }
x.domain(d3.extent(data, d => d[kx]))
y.domain(d3.extent(data, d => d[ky]))
vis
.call(s => {
s.append('g').attr('class', 'x grid').call(
d3.axisBottom(x).tickSize(height, 0).tickFormat('') )
s.append('g').attr('class', 'y grid').call(
d3.axisLeft(y).tickSize(-width, 0).tickFormat('') ) })
.call( s => s
.append('g')
.attr('class', 'x axis').attr('transform', `translate(0,${height})`)
.call(d3.axisBottom(x))
.append('text')
.attr('transform', `translate(${width},0)`)
.attr('dx', '-1em').attr('dy', '3em')
.style('text-anchor', 'end').text(kx) )
.call( s => s
.append('g').attr('class', 'y axis').call(d3.axisLeft(y))
.append('text')
.attr('transform', 'rotate(-90)').attr('dx', '-1em').attr('dy', '-3em')
.style('text-anchor', 'end').text(ky) )
.call(s => s.append('path').data([data]).attr('class', 'line') .attr('d', line))
vis.append('line').attr('class', 'mark')
.call(attrs({x1: x(50), x2: x(50), y1: 0, y2: height}))
// Focus data on mouseover
let side = -1, // 1 or -1
x_bisect = d3.bisector(d => d[kx]).left,
focus = vis
.append('g').attr('class', 'focus').style('display', 'none')
.call(s => s.append('circle').attr('r', 4.5)),
focus_label = focus.append('text')
.attr('x', 10).attr('dy', '.3em')
.attr('text-anchor', side > 0 ? 'start' : 'end')
let format_n = d3.format(',.3f'),
format = (k, v) => {
if (k == kx) return v
if (k == ky) return format_n(v)
return (typeof v === 'number') ? format_n(v) : v }
vis.append('rect')
.attr('class', 'overlay').attr('width', width).attr('height', height)
.on('mouseover', (ev, d) => focus.style('display', null))
.on('mouseout', (ev, d) => focus.style('display', 'none'))
.on('mousemove', (ev, d) => {
let x0 = x.invert(d3.pointer(ev)[0]),
i = x_bisect(data, x0, 1), d0 = data[i-1], d1 = data[i]
d = x0 - d0[kx] > d1[kx] - x0 ? d1 : d0
focus.attr('transform', `translate(${x(d[kx])},${y(d[ky])})`)
focus_label.selectAll('tspan').call( s => s
.data(Object.entries(d).map(([k, v]) => `${k}: ${format(k, v)}`).sort())
.join(
en => en.append('tspan').attr('dy', '1.5em').attr('x', `${side}em`),
upd => upd.text(d => d), ex => ex.remove() ) ) })
})
</script>
</body>